Page 3 - WARRANTY; ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
WARRANTY Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one (1) yearfrom the date of shipment. If any such product proves defective during this warranty period, Tektronix, at its option, eitherwill repair the defective product without char...
Page 5 - 715 Spectrum Analyzer Service Manual; Table of Contents; Specifications
2715 Spectrum Analyzer Service Manual i Table of Contents General Safety Summary ix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Service Safety Summary xi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Preface xv . . . . . . . . . . . . . . . . . . ....
Page 6 - Performance Verification
Table of Contents ii 2715 Spectrum Analyzer Service Manual 1st LO Interface, 1st LO, and 1st LO Buffer Amplifier 3-14 . . . . . . . . . . . . . . . . . . Reference Oscillator 3-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Phase Lock Assembly (Center ...
Page 7 - List of Figures
Table of Contents 2715 Spectrum Analyzer Service Manual iii List of Figures Figure 1-1: Typical Accuracy Limits for Carrier-to-Noise Measurement 1-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 1-2: Typical Accuracy Limits for CTB Measurement 1-7 . . . ....
Page 11 - List of Tables
Table of Contents 2715 Spectrum Analyzer Service Manual vii List of Tables Table 1-1: CATV Characteristics 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 1-2: Frequency-Related Characteristics 1-11 . . . . . . . . . . . . . . . . . . Table 1-3: Frequency/Amplitude Related Characte...
Page 13 - General Safety Summary; Only qualified personnel should perform service procedures.; To Avoid Fire or
2715 Spectrum Analyzer Service Manual ix General Safety Summary Review the following safety precautions to avoid injury and prevent damage tothis product or any products connected to it. To avoid potential hazards, use thisproduct only as specified. Only qualified personnel should perform service pr...
Page 14 - Symbols and Terms
General Safety Summary x 2715 Spectrum Analyzer Service Manual Keep Product Surfaces Clean and Dry. Provide Proper Ventilation. Refer to the manual’s installation instructions for details on installing the product so it has proper ventilation. Terms in this Manual. These terms may appear in this man...
Page 15 - xi; Service Safety Summary; Service
2715 Spectrum Analyzer Service Manual xi Service Safety Summary Only qualified personnel should perform service procedures. Read this Service Safety Summary and the General Safety Summary before performing any service procedures. Do Not Service Alone. Do not perform internal service or adjustments o...
Page 17 - xiii; Preface
2715 Spectrum Analyzer Service Manual xiii Preface This manual contains service information for the 2715 Spectrum Analyzer. Theservice information is located in two volumes. Volume 1 contains the mainte-nance procedures and parts lists. Volume 2 contains the component locators andschematic diagrams....
Page 18 - Contacting Tektronix
Preface xiv 2715 Spectrum Analyzer Service Manual Contacting Tektronix Phone 1-800-833-9200 * Address Tektronix, Inc.Department or name (if known)14200 SW Karl Braun DriveP.O. Box 500Beaverton, OR 97077USA Web site www.tektronix.com Sales support 1-800-833-9200, select option 1 * Service support 1-8...
Page 19 - Electrical Characteristics
2715 Spectrum Analyzer Service Manual 1- 1 Specifications This section lists the electrical, physical, and environmental characteristics of thespectrum analyzer, specifies the performance requirements for those characteris-tics, and provides supplementary information. Electrical Characteristics Unle...
Page 20 - Characteristic
Specifications 1- 2 2715 Spectrum Analyzer Service Manual Table 1- 1: CATV Characteristics Characteristic Description Input Configuration All except Option 50 75 Ω Female F connector Option 50 50 Ω Type N connector Channel Selection The visual and aural carriers are displayed when the channel number...
Page 27 - Figure 1- 5: Typical ACL Measurement Limits for 2 dB Accuracy; Figure 1- 6: Typical D/U Measurement Range Limits for 2 dB Accuracy
Specifications 2715 Spectrum Analyzer Service Manual 1- 9 Measurement Limit (dBc) -- 25 -- 35 -- 45 -- 55 -- 65 -- 20 -- 10 0 10 20 30 40 50 60 70 INPUT LEVEL (dBmV) FOR SINGLE-SIGNAL TEST ENVIRONMENT To 500 MHz 500 MHz to 1000 MHz Figure 1- 5: Typical ACL Measurement Limits for 2 dB Accuracy Measur...
Page 31 - Display Dynamic Range
Specifications 2715 Spectrum Analyzer Service Manual 1- 13 Table 1- 2: Frequency-Related Characteristics (Cont.) Characteristic Supplemental Information Performance Requirement Resolution Bandwidth (6 dB down) Resolution bandwidth selections are: 5 MHz, 1 MHz, 300 kHz, 100 kHz,30 kHz, 10 kHz, 3 kHz,...
Page 35 - Do not apply more than
Specifications 2715 Spectrum Analyzer Service Manual 1- 17 Table 1- 4: Amplitude-Related Characteristics (Cont.) Characteristic Supplemental Information Performance Requirement Spurious Responses Residual (no input signal) All except Option 50 and Option 75: ≤ --51 dBmV ( ≤ --100 dBm) except at 1780...
Page 37 - Table 1- 7: Supplementary Characteristics Due to Options
Specifications 2715 Spectrum Analyzer Service Manual 1- 19 Table 1- 5: Input/Output Signal Characteristics (Cont.) Characteristic Supplemental Information Performance Requirement Pin 11: VLVL Output DC output to Option 05 (ExternalTracking Generator); typically 9.5 V with TG level set to ON. Pin 12:...
Page 41 - Category
Specifications 2715 Spectrum Analyzer Service Manual 1- 23 Table 1- 11: Certifications and Compliances Category Description EC Declaration of Conformity --EMC Meets intent of Directive 89/336/EEC for Electromagnetic Compatibility. Compliance wasdemonstrated to the following specifications as listed ...
Page 42 - Standards
Specifications 1- 24 2715 Spectrum Analyzer Service Manual Table 1- 12: Safety Certification Compliance Category Description Temperature (operating) +5 ° C to +50 ° C Altitude (maximum operating) 2000 meters (6562 ft.) Relative Humidity (maximum op-erating) 80% for temperatures up to 31 ° C, decreas...
Page 43 - Operating Information; Instrument Description; Precision Measurements
2715 Spectrum Analyzer Service Manual 2- 1 Operating Information This section contains the following: H Instrument description H Conformance to industry standards H Product service information H Instrument construction H Installation and preparation for use H Power cord H Fuse replacement H Assembly...
Page 44 - Conformance to Industry Standards
Operating Information 2- 2 2715 Spectrum Analyzer Service Manual H Single and ∆ Markers A single marker can be enabled to show the frequency and amplitude of a specific point on the display. Delta ( ∆ ) markers show the difference frequency and amplitude between any selected twopoints on the display...
Page 45 - Instrument Construction; NOTE; Installation and Preparation for Use
Operating Information 2715 Spectrum Analyzer Service Manual 2- 3 Instrument Construction Modular construction provides ready access to the major circuits. Each circuitboard containing RF sensitive circuits is mounted in a casting, with feed throughconnectors through the compartment walls. Most board...
Page 46 - Replaceable Mechanical Parts; Menus
Operating Information 2- 4 2715 Spectrum Analyzer Service Manual Replacing the Fuse Replace the line fuse with a 2 A Slow Blow fuse. Selected Components Some components are specifically selected to meet Tektronix specifications.These components are shown in the parts list. Selected value components ...
Page 48 - SWP/TRG Menu Structure
Operating Information 2- 6 2715 Spectrum Analyzer Service Manual 0 FREE RUN 1 INTERNAL 2 EXTERNAL 3 LINE 4 TV LINE 5 TV FIELD SWEEP MENU 6 SWEEP RATE 7 MANUAL SCAN 8 SYNC POLARITY 9 SETUP TABLE HORIZONTAL LINE TRIGGERING 0 CONTINUOUS 1 KNOB SELECTABLE 2 KEYPAD ENTERED LINE 3 KEYPAD ENTRY 4 TV LINE S...
Page 50 - MRK/FREQ Menu Structure
Operating Information 2- 8 2715 Spectrum Analyzer Service Manual 1 STORED SETTINGS / DISPLAYS 2 KEYPAD ENTERED SETTINGS 3 NORMALIZATIONS 4 SYSTEM CONFIGURATION 5 INSTR DIAGNOSTICS/ADJUSTMENTS 6 SERVICE REQUEST 9 MORE 0 DIAGNOSTICS * 1 EXTENDED DIAGNOSTICS * 2 MANUAL ADJUSTMENTS 3 DEBUG MENU * 4 INTE...
Page 56 - CATV/APPL Applications Menu Structure
Operating Information 2- 14 2715 Spectrum Analyzer Service Manual 0 BANDWIDTH MODE 1 CARRIER TO NOISE 2 NOISE NORM’D 3 SIGNAL SEARCH MENU 4 OCCUPIED BW 7 FM DEVIATION MODE 8 CATV MEASUREMENT MODE 9 SETUP TABLE 0 BEGIN FREQ 1 END FREQ 2 START TEST 3 DISPLAY RESULTS CATV/APPL Applications Menu Structu...
Page 57 - DSPL Menu Structure
Operating Information 2715 Spectrum Analyzer Service Manual 2- 15 0 DIGITAL/ANALOG 1 ENSEMBLE AVERAGING 2 B, C MINUS A 3 B, C MINUS A OFFSET TO 4 ACQUISITION MODE 5 TITLE MODE 6 GRATICULE ILLUMINATION 7 DISPLAY SOURCE (AM) 8 DISPLAY LINE 9 MIN HOLD 1 INITIATE AVERAGING 2 TERMINATE AVERAGING 3 MAX 4 ...
Page 58 - INPUT Menu Structure
Operating Information 2- 16 2715 Spectrum Analyzer Service Manual 1 PREAMP 3 REF LEVEL UNIT 4 1ST MXR INPUT LVL 5 RF ATTENUATION 6 EXTERNAL ATTEN/AMPL 9 CAL SIG @ 100MHZ 18.8DBMV 0 DBM 1 DBMV 2 DBV 3 DBUV 4 DBUW 5 DBUV/M IN WFM x 9 DBUV/M SETUP INPUT Menu Structure 0 ON/OFF 1 ATTEN/AMPL ENTRY 0 EDIT...
Page 59 - Theory of Operation; Block Diagram Description
2715 Spectrum Analyzer Service Manual 3- 1 Theory of Operation This section describes the 2715 circuitry. The section begins with a functionaldescription of the major circuit blocks. This is followed by more detaileddescriptions of the circuitry within each block. While reading these descriptions,re...
Page 60 - Diagrams
Theory of Operation 3- 2 2715 Spectrum Analyzer Service Manual A 25 Ω resistor within the RF INPUT connector assembly is placed in series with the signal path. This transforms the connector to a 75 Ω impedance for external signal connections. All RF signal connections within the 2715 (SMAand SMB con...
Page 63 - Center Frequency Control; LO
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 5 The Display Storage board is capable of storing four waveforms of 512 byteseach, four pages of text of 512 bytes each, and up to two markers. Any combina-tion of waveforms and text may be displayed on the CRT. If any waveforms arebeing d...
Page 64 - Oscillator
Theory of Operation 3- 6 2715 Spectrum Analyzer Service Manual This is a precision, temperature controlled, quartz crystal oscillator that providesthe reference around which all instrument frequency related performancerevolves. It is designed for maximal frequency stability over temperature andtime,...
Page 65 - LO Buffer; s. The video monitor mode is
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 7 1 st LO Buffer The 1st LO Buffer consists of a Leveled Amplifier and a Phase Gate Detector.The Leveled Amplifier provides the LO input drive for the 1st Mixer. The PhaseGate Detector logs 1st LO drift. That information is then used for f...
Page 66 - Display System
Theory of Operation 3- 8 2715 Spectrum Analyzer Service Manual Display System The Display System consists of the Vertical Display circuit, Horizontal Displaycircuit, and Z Axis circuit. See Figure 3--2. The Display System has three possible display modes. The active spectrumdisplay mode displays the...
Page 67 - Circuit Description; Attenuator and 1; Converter; Step Attenuator
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 9 Circuit Description The following sections provide detailed circuit descriptions and is arranged tofollow the input signal flow. While reading these descriptions, refer to thecorresponding diagrams in Section 9: Diagrams . Attenuator and...
Page 68 - Low Pass Filter
Theory of Operation 3- 10 2715 Spectrum Analyzer Service Manual A relay switch at the input of the Step Attenuator selects the RF input signal orthe internal calibrator signal. See Figure 3--3. Since the calibrator signal comesinto the Step Attenuator assembly ahead of the attenuators, it can be use...
Page 70 - RF Mother Board and Phase Locked 2nd LO; Figure 3- 5: Block Diagram of RF Mother Board; Overview
Theory of Operation 3- 12 2715 Spectrum Analyzer Service Manual RF Mother Board and Phase Locked 2nd LO This section contains a detailed description of the RF Mother board and PhaseLocked 2nd Local Oscillator. The RF Mother board converts the 1st IF frequency to 10 MHz in two frequencyconversions. T...
Page 71 - GHz Phase locked LO.; Detailed Circuit
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 13 The 110 MHz 2nd IF is amplified and divided along two paths. One path isthrough a buffer amplifier to the sweep board where the signal is available to thesatellite demodulator. The second path is through a PIN attenuator which sets theg...
Page 72 - LO Buffer Amplifier; Figure 3- 6: 1st LO Interface and 1st LO Diagram; LO Interface
Theory of Operation 3- 14 2715 Spectrum Analyzer Service Manual 110 MHz Bandpass Filter. This filter is a 5th order, shunt resonator Butterworth filter. 3rd Mixer. U665 and its associated circuitry make up the 3rd mixer. Output Amplifier. This IF amplifier consists of a common emitter transistor (Q6...
Page 73 - Figure 3- 7: 1st LO Buffer Amplifier Diagram
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 15 When the FM coil is used to sweep the oscillator, the relay on the Interface boardcloses and couples a large capacitor (two capacitors in parallel) across the maincoil. The capacitors lower the noise bandwidth of the main coil driving c...
Page 74 - Reference Oscillator
Theory of Operation 3- 16 2715 Spectrum Analyzer Service Manual The directional coupler couples approximately --15 dBm of the amplified LOsignal to the detector. The coupled signal is then amplitude detected, and theresultant DC level fed to the noninverting input of a comparator, where it iscompare...
Page 76 - Figure 3- 9: Crystal Heater and 15 V Regulation Circuit
Theory of Operation 3- 18 2715 Spectrum Analyzer Service Manual The heater circuit maintains a constant 15 V potential across the heater elementregardless of power supply ripple. The circuit is shown in Figure 3--9. 22.1 k Ω +5.2 V -- 11 V +5 V − 11 V − 11 V Heater 6.91 k Ω 10 k Ω 10 k Ω 22.1 k Ω 10...
Page 78 - mA; Amplitude Calibrator.
Theory of Operation 3- 20 2715 Spectrum Analyzer Service Manual r s <50 Ω 47.5 Ω 20 nH 3.92 k Ω R t +5 V 47.5 Ω 3.92 k Ω 82 pf 1 k Ω − 8.8 V − 8.8 V − 8.8 V 0.1 f Q1 Q2 r e2 ≈ 5.7 Ω r e1 ≈ 8.3 Ω 82.5 Ω 1.5 k Ω Figure 3- 11: Oscillator DC Equivalent The voltage swing required across the tank circu...
Page 79 - Phase Lock Assembly (Center Frequency Control System)
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 21 Microprocessor Interface. The Microprocessor Interface is used by the Micropro- cessor board to communicate with the Reference Oscillator board. An 8 bit inputshift register controls the operation of the board, and an 8 bit output shift...
Page 80 - PLCFC Module Functional Blocks.; Power Supply Regulation
Theory of Operation 3- 22 2715 Spectrum Analyzer Service Manual In wide spans (5.1 MHz/div or greater), the center frequency is set coarsely bysetting a suitable bias current in the main coil. Fine increments of the centerfrequency are set by appropriate currents to the FM coil. In this mode, sweepi...
Page 81 - LO Coil Drivers
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 23 This supply consists of VR160, U166, U174, Q170, Q674, and associatedcomponents. VR160 is a temperature compensated reference diode that definesthe output voltage. U166 and Q170 constitute a buffered scaling amplifier toprovide the desi...
Page 83 - Strobe Frequency
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 25 When the FM coil driver is in use (instrument not phase locked) there are twopotential signal sources summed into the driver circuit. One that is alwayspresent is induced by DAC U850A and subsequent circuits. It is steered intoU821 by s...
Page 84 - LO Phase Lock Loop
Theory of Operation 3- 26 2715 Spectrum Analyzer Service Manual down the strobe driver amplifier in the 1st LO BUFFER module. Also, U240 serves as a count selector switch. It selects either the LFVCO signalor the 1st LO beat signal (from the PLCFC board) for counting by the micropro-cessor. R241 is ...
Page 85 - Signal Path and Switching
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 27 This allows for 1st LO drift or user changes to the center frequency settingwithout having to drop and reacquire lock for every change. If Q652 is turned on by the signal UNLKIND (signifying that the inner loop isunlocked), both INCR MA...
Page 88 - Digital to Analog
Theory of Operation 3- 30 2715 Spectrum Analyzer Service Manual FSTROBE FM Main Main DAC SWP DAC DIG 1st LO Beat to Counter for Lock Verification Phase Gate Harm Gen VCO Module(Strobe Gen) Summing and Fixed Scaling VREF 1st LO 1st LO to 1st Converter N-F Strobe PLL DAC VREF DIG Microprocessor Serial...
Page 89 - Digital Interface
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 31 In phase locked spans, its output is used to fine tune the VCO frequency. Ineither case its output passes through U852, which has an output range of 0 to+5 V. U845 sums that with an offset and provides gain so that the output of U845ran...
Page 90 - Summary of Digital
Theory of Operation 3- 32 2715 Spectrum Analyzer Service Manual This is the loop back path referred to earlier for checking the interface. Thisregister may also be loaded with up to eight bits of parallel data for subsequentserial transfer to the microprocessor. Only three bits are used. Bits 7 and ...
Page 91 - Variable Resolution Module; Input Amplifier
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 33 A0, A1, and A2. Address lines for DAC internal register selection and control. UPD. Used for simultaneous transfer to DAC output registers. DB0’, dB1’, dB2’, and dB3’. Data lines for DAC U950 (A and B). DB0, dB1, dB2, and dB3. Data line...
Page 92 - Figure 3- 15: Variable Resolution Module Diagram; PIN Attenuator
Theory of Operation 3- 34 2715 Spectrum Analyzer Service Manual RF OPTIONS 1 dB Step 0 2 4 6 8 10 5 MHz 300 kHz 30 kHz 3 kHz 10 MHz/ − 10 dBm to Log Amp PIN DiodeAttenuator 10 MHz/ − 20 dBm from RF Mother Board 1 MHz, 100 kHz, 10 kHz, 1 kHz, and 300 Hz Filters 10 10 10 10 10 Figure 3- 15: Variable R...
Page 93 - RF Options; 0 dB Gain Step Amplifier
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 35 The 10 dB gain step stages incorporate a transformer feedback amplifier. Thesestages have approximately 0.5 dB of loss or 9.5 dB of gain, for a net differenceof 10 dB. When the gain step is selected, the signal is routed through theampl...
Page 96 - Log Amplifier; Hardware
Theory of Operation 3- 38 2715 Spectrum Analyzer Service Manual Log Amplifier The Log Amplifier system is a high performance, intermediate amplifier systemthat provides display laws of linear detection and logarithmic detection of theincoming signal. The log display has scale factors of 10 dB/div, 5...
Page 97 - Logarithmic Amplifier
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 39 The core of the logging stage is a pair of AD640s. The AD640 uses fivecascaded limiting amplifiers to approximate a logarithmic response to an inputsignal of wide dynamic range and wide bandwidth. The two AD640s are used ina parallel/su...
Page 98 - Display Storage
Theory of Operation 3- 40 2715 Spectrum Analyzer Service Manual Immediately following the Video Filters is the Scale Factor amplifier. The gainof the Scale Factor amplifier can be set to 1.1, 2.2, 5.5, or 11 corresponding to10 dB/div, 5 dB/div, 2 dB/div, or 1 dB/div. The linear function is done with...
Page 99 - Mode Control Register 1.; Mnemonic; Control System Interface
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 41 H Provides for the ability to place up to two markers on a displayed waveform H Implement and display a B,C--Save A waveform H Display readout information on the screen H Provide up to 28 Kbytes of nonvolatile storage area H Provide two...
Page 102 - Description
Theory of Operation 3- 44 2715 Spectrum Analyzer Service Manual Table 3- 6: Mode Control Register 2 (Cont.) BitNumber Description ActivityLevel Mnemonic 4 MKRWFM0 Low Markers on Display A 3 UPDATED_L Low Display D updating, not in save mode 2 UPDATEC_L Low Display C updating, not in save mode 1 UPDA...
Page 103 - MKRWFM3; Display Control Register.
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 45 Table 3- 8: Enhanced Mode MKRWFM[1..0] Bit Assignment MKRWFM3 MKRWFM2 Marker 2 on Waveform... 0 0 Waveform A 0 1 Waveform B 1 0 Waveform C 1 1 Waveform D UPDATED_L. This bit, when low, allows the vertical data to be stored inWaveform D....
Page 106 - Name
Theory of Operation 3- 48 2715 Spectrum Analyzer Service Manual MKR2_LT. This signal becomes active (high) at any access to the Marker 2 portaddresses (I/O port addresses 0xFE00 through 0xFFFF). This signal also causesthe UPREQ signal to become active. Table 3--11 is the memory map for the Display S...
Page 107 - Control Register Name
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 49 Control Registers . There are five control registers on the Display Storage board which are used to set the various operating modes for the board. All of thecontrol registers are read/write registers, with the exception of the ScrollReg...
Page 108 - Horizontal Input and Tracking A/D
Theory of Operation 3- 50 2715 Spectrum Analyzer Service Manual BCLK BA<19.0> WR_L UPREQ PORTVEC UPGRNT_L WRDATEN 0ns 500ns 1000ns 1500ns 2000ns 2500ns 3000ns Figure 3- 17: Timing Diagram for a Typical Write to the Control Register The CPU starts a write cycle to the Display Storage board, pre...
Page 109 - Vertical Input
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 51 The comparators are contained in an LM319, U9. The top (UP) comparatordetermines if the summing node is greater than the 49.5 mV reference point. Thebottom (DN) comparator determines is the summing node is less than the 0.0 Vreference. ...
Page 111 - Horizontal Bin
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 53 At the end of a horizontal bin the contents of the Max Accumulator will bewritten to waveform memory. If the acquisition mode is Min Peak the same comparisons occur as in Max Peakacquisition mode, except that the Min Accumulator is used...
Page 112 - Readouts and Waveform Drawing.
Theory of Operation 3- 54 2715 Spectrum Analyzer Service Manual BCLK BOB ACQGRNT_L WE_L OE_L CEO_L 0ns 500ns 1000ns 1500ns 2000ns 2500ns CE1_L RAMD<7. .0> RAMAD<14..0> Figure 3- 19: Sequence of Events When Writing Data to the Waveform Memory The two DS1210’s, U6 and U28, are used to prov...
Page 113 - Page Number
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 55 Table 3- 14: Page Number/Waveform Relation Page Number Refers to 0 Waveform A 1 Waveform B 2 Waveform C 3 Waveform D 4 Text Page 1 (Readouts) 5 Text Page 2 6 Text Page 3 7 Text Page 4 If the page to be displayed is a waveform then the a...
Page 115 - Figure 3- 21: The Display of a Single Vector of a Waveform; Figure 3- 22: A Single Column of Character Dots
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 57 BCLK DSPRBQ DSPGRNT_L RAMAD<14..0> RAMD<7..0> VWFM<7..0> VDAC<7..0> 0ns 500ns 1000ns 1500ns 2000ns 2500ns 3000ns HDAC<8..0> DSBLNK_L 3500ns Figure 3- 21: The Display of a Single Vector of a Waveform Figure ...
Page 117 - Miscellaneous Decoupling.
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 59 The Error Amplifier compares the current state of the Integrator Circuity outputand the current input voltage from the DAC and generates an error voltage. Thiserror voltage is then fed into a high current buffer made up of Q4, Q5, and C...
Page 118 - Microprocessor
Theory of Operation 3- 60 2715 Spectrum Analyzer Service Manual The Power up reset circuit consists of a TL7705 Power Supervisor IC. This ICmonitors the +5 V supply and generates a reset signal on power up. Thecapacitor, C101, is used to delay the rising edge of BDRST_L for about 50 ms.This ensures ...
Page 119 - Figure 3- 24: Microprocessor Block Diagram
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 61 8/D 8/D 8/D AD0 − AD7 In te rnal Pa rallel Bus 8/D Buffer (Bidirectional) 8/D 14.7456 MHz RAM/ROM (4 Each) Interrupt Timer Audio Timer Serial Bus Interface Status Buffers Buffer (Bidirectional) Clock Generator CLK88 Address Latches (3) ...
Page 121 - Interrupt Number; Clock Generator
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 63 The Clock Generator chip (U360) is an NEC PD71011. The purpose of this IC is to generate the clock for the Microprocessor board and synchronize theinsertion of wait states into the CPU. The Clock Generator part of the IC uses a 14.7456 ...
Page 122 - See the NEC; I/O Subsystem Interface
Theory of Operation 3- 64 2715 Spectrum Analyzer Service Manual Table 3- 15: Interrupt Controller InputConnections (Cont.) Interrupt Number System Connection IR5 Digital Options Board IR6 Digital Options Board IR7 Programmable Interval Timer 1 See the NEC PD71059 (or Intel 82C59) data sheets for mor...
Page 123 - Memory Size; Memory
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 65 Reading from a module begins with the module requesting service through itsactive low request signal (FPREQ-- for the front panel, ...). This signal goes intoa priority encoder (U780) on the Power Supply Secondaries, then pulls theMicro...
Page 124 - Table 3- 17: Definition of Software Jumpers; Jumper Status; Software Option Jumpers
Theory of Operation 3- 66 2715 Spectrum Analyzer Service Manual Allowances have been made for on board programming of the EPROM devices.On board programming is done by removing J528 (and/or W528) and thensupplying the appropriate timing and voltage signals to program the EPROMsthrough connector J550...
Page 126 - Signal Name; Hardware Interface
Theory of Operation 3- 68 2715 Spectrum Analyzer Service Manual The Microprocessor requires several signals. A brief description of these signals,by connector, is given in Table 3--18, Table 3--19, and Table 3--20. Table 3- 18: Power Supply and Serial Bus Connector (J10) Signal Names andDefinitions ...
Page 128 - Frequency Counter Connectors.; Connector; Power Supply Interface.; Connector Pinouts
Theory of Operation 3- 70 2715 Spectrum Analyzer Service Manual Table 3- 20: Microprocessor Counter Section Connector Signal Names andDefinitions Signal Name Description Source Module CFC Center Frequency (J180): Signal from the CFCboard to be counted Center Frequency Control OPTION Optional Input (...
Page 129 - Pin Name
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 71 Table 3- 22: Pinout for the 24-Pin DIN Connector (J10)Between the Microprocessor Board, Power SupplyInterconnect, and Serial I/O Pin No. Pin Name 1 DETVID 2 —KEY— 3 SWPGATE 4 POK 5 REQI -- 6 UPAUD 7 CLKI -- 8 CLKO 9 DATAI 10 DATAO 11 AC...
Page 132 - Gated Measurement
Theory of Operation 3- 74 2715 Spectrum Analyzer Service Manual GPIB, RS - 232, Real Time Clock, NVRAM, and Gated Measurement Functions The Digital Options module provides both the RS--232 and GPIB interface andgated sweep capability. The features are: H Gated measurement functions to provide in ser...
Page 133 - Register Name; Real Time Clock
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 75 The Real Time Clock (RTC) is an Oki Semiconductor MSM62X42BRSclock/calendar (U23). This IC uses an internal 32,768 Hz clock which is divideddown to 1 Hz. This one hertz clock is then used to drive the time registers. Eachtime register c...
Page 134 - Battery Backup Circuit
Theory of Operation 3- 76 2715 Spectrum Analyzer Service Manual The battery backup circuits consist of a 2.8 V lithium battery (BT1), and twoDS1210 (U16 and U17) power monitor chips. U17 supplies backup power forthe RAM (U8), likewise U16 supplies the real time clock (U23). The DS1210chips supply po...
Page 135 - Video Gating Control
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 77 There are ten video gating control registers on the Digital Option module. All ofthese control registers are write only registers, with the exception of misc. gatingcontrol register (address 0x210). The other nine registers contain line...
Page 136 - Video Demodulator; Operation of the video demodulator board is described as follows:; Control Signal Conditioner
Theory of Operation 3- 78 2715 Spectrum Analyzer Service Manual This circuit takes in HCMOS logic levels and produces shaped and risetimecontrolled control signal(s) having the characteristics required by the IF gatecircuit. The IF_GATE_EN signal is first passed through CMOS inverter U6powered from ...
Page 137 - Video Detector
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 79 The tuning voltage path from the DAC to its varactor includes a temperaturecorrection from sensor (U9). The 45.7 MHz signal from the SAW filter is presented to the MC44301demodulator (U16). This device passes the signal through an AGC c...
Page 138 - Sweep; AFC Lock Control
Theory of Operation 3- 80 2715 Spectrum Analyzer Service Manual The lock control circuitry is used to switch the AFC loop (mentioned in thedownconverter description) ON or OFF as required in the course of getting thevideo demodulator locked onto a new TV channel. The AFC loop needs to bereset by the...
Page 141 - Front Panel; resistor. The nominal LED current is 10 mA.; Input Shift Registers
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 83 All of the control information is shifted in through four shift registers U211,U312, U610, and U520. Front Panel The Front Panel acts as an interface between the user and the instrument. Thesecircuits translate operator actions on front...
Page 142 - Switch Matrix Debounce Circuit.; Switch Matrix
Theory of Operation 3- 84 2715 Spectrum Analyzer Service Manual The FPREQEN-- signal is used to enable the front panel request output buffer. IfFPREQEN-- is in the inactive state, the front panel service request line to themicroprocessor will always be active (always requesting service). The CLKIEN-...
Page 144 - Gray Code Knob
Theory of Operation 3- 86 2715 Spectrum Analyzer Service Manual The three conditions illustrated in Figure 3--27 are as follows: 1. Switch pressed and released inside the 50 ms time of POS. 2. Switch pressed and released well after both the POS and ROS have timedout. 3. Switch pressed and released w...
Page 145 - Diagnostics and
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 87 5. After the firmware recognizes the request for service, the FPACK-- line is setlow, which enables the DATAI and CLKI tristate buffers. 6. The data is then clocked out of the switch matrix shift registers. 7. After the data has been cl...
Page 146 - Primary
Theory of Operation 3- 88 2715 Spectrum Analyzer Service Manual The Power Supply primary circuits consist of the AC Input circuit, a Pulse WidthModulator (PWM), an Inverter, and a Frequency Lock circuit. See Figure 3--28. AC Input. Input power is applied through an EMI line filter, a line fuse, an o...
Page 148 - Secondary
Theory of Operation 3- 90 2715 Spectrum Analyzer Service Manual NOTE . For instruments with serial numbers B030000 or above , a dead time control (DTC) R669 has been added which will be used to set the maximum highvoltage measured at the –2.75KV test point by varying the voltage at pin 1 ofU260. New...
Page 149 - Figure 3- 29: Display Amplifiers Block Diagram
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 91 Power Supply (Display) The Display system consists of the following: H CRT Bias H Vertical Display circuit H Horizontal Display circuit H Z Axis circuit Figure 3--29 is a block diagram of the Display Amplifier. CRTINTS − VIDZ VIDVERT DS...
Page 150 - Vertical Display
Theory of Operation 3- 92 2715 Spectrum Analyzer Service Manual The CRT is biased as follows: Cathode --2750 VDC Heater --2750 VDC, 6.2 V RMS Grid --2880 VCO Accelerator 24 VDC Focus --2200 to --1925 VDC Astigmatism 115 to 0 VDC D3, D4 ave 24 VDC D1, D2 45 VDC Geo mesh 115 to 0 VDC Anode 11000 VDC T...
Page 151 - Horizontal Display
Theory of Operation 2715 Spectrum Analyzer Service Manual 3- 93 The Horizontal Display circuit is a paraphase amplifier. Gain and DC offset(Horizontal Position) are set so the signal at the input of the paraphase amplifierswings from --1 V to +1 V. The output of the paraphase amplifier then drives t...
Page 153 - Performance Requirement; Incoming Inspection Test
2715 Spectrum Analyzer Service Manual 4- 1 Performance Verification This section contains procedures for verifying that the instrument performsaccording to the characteristics stated in the Performance Requirement columns in Section 1: Specifications . If a failure is found, it is recommended that o...
Page 154 - Equipment Required; Test Equipment; attenuators such as
Performance Verification 4- 2 2715 Spectrum Analyzer Service Manual Equipment Required Table 4--1 lists the test equipment recommended for the Performance Verifica-tion. The characteristics specified are the minimum. If equipment is substituted,it must meet or exceed these specifications. Table 4- 1...
Page 155 - UTIL
Performance Verification 2715 Spectrum Analyzer Service Manual 4- 3 Table 4- 1: Equipment Required (Cont.) Test Equipment Recommended Characteristic BNC T Adapter Tektronix Part No. 103-0030-00 Adapter, N Male to BNC Female 50 Ω Tektronix Part No. 103-0045-00 Adapter, Female-to-Female F 75 Ω Tektron...
Page 156 - Front Panel Operation; 715 Spectrum Analyzer User Manual; Performance Check Procedure; Frequency Accuracy
Performance Verification 4- 4 2715 Spectrum Analyzer Service Manual NOTE . Step 9 above exits the CATV mode and places the Spectrum Analyzer in a Calibration Mode. This mode must be used for all steps in this section. Front Panel Operation Refer to the 2715 Spectrum Analyzer User Manual for an expla...
Page 157 - Resolution Bandwidth
Performance Verification 2715 Spectrum Analyzer Service Manual 4- 5 Performance requirement is 7:1 or less for Bandwidths ≤ 1 MHz. 1. Recall default power up settings by pressing UTIL 1 1 . 2. Select the following settings on the Spectrum Analyzer: FREQUENCY 100 MHz REFERENCE LEVEL --30 dBm SPAN/DIV...
Page 158 - Short Term Drift
Performance Verification 4- 6 2715 Spectrum Analyzer Service Manual Performance requirement is ≤ 400 Hz between frequency corrections. 1. Recall default power up settings by pressing UTIL 1 1 . 2. Select the following settings on the Spectrum Analyzer: FREQUENCY 100 MHz REFERENCE LEVEL --30 dBm SPAN...
Page 159 - Table 4- 3: Settings for the Noise Sidebands Check; Accuracy
Performance Verification 2715 Spectrum Analyzer Service Manual 4- 7 Table 4- 3: Settings for the Noise Sidebands Check Span/Div Resolution Bandwidth 30 X Resolution Bandwidth 1 MHz 100 kHz 3 MHz 500 kHz 30 kHz 900 kHz 100 kHz 10 kHz 300 kHz 5 kHz 300 Hz 9 kHz Performance requirement is within 3% ove...
Page 160 - Table 4- 4: Front Panel Span Accuracy Settings; Time Markers; MAX HOLD A B; Flatness
Performance Verification 4- 8 2715 Spectrum Analyzer Service Manual Table 4- 4: Front Panel Span Accuracy Settings Time Markers CenterFrequency Span/Div ResolutionBandwidth SpecificationRange 10 ns 500 MHz 100 MHz 300 kHz 776 --824 MHz 20 ns 250 MHz 50 MHz 300 kHz 388 --412 MHz 50 ns 100 MHz 20 MHz ...
Page 161 - Marker Operation
Performance Verification 2715 Spectrum Analyzer Service Manual 4- 9 5. When the sweep oscillator has finished its sweep, press MKR / ∆ / OFF to activate the marker. 6. Press MKR / ∆ / OFF again to activate the delta marker and tune it to the highest and lowest points on the response curve. Note the ...
Page 162 - INPUT 9; Display Dynamic
Performance Verification 4- 10 2715 Spectrum Analyzer Service Manual 9. Use the following procedure to check Center Measure/Counter ResolutionCounter Resolution selectable. Performance requirement is 1 Hz or 1 kHz a. Recall default power up settings by pressing UTIL 1 1 . Select the following settin...
Page 163 - RES BW
Performance Verification 2715 Spectrum Analyzer Service Manual 4- 11 1. Recall default power up settings by pressing UTIL 1 1 . Select the following settings on the Spectrum Analyzer: FREQUENCY 110 MHz REFERENCE LEVEL --20 dBm SPAN/DIV 1 kHz RESOLUTION BW AUTO VID FLTR On VERTICAL SCALE 1 dB/ MARKER...
Page 165 - Span; INPUT MENU 1; Sensitivity
Performance Verification 2715 Spectrum Analyzer Service Manual 4- 13 Check Sensitivity as specified in Table 4--7. 1. Recall default power up settings by pressing UTIL 1 1 . Select the following settings on the Spectrum Analyzer: FREQUENCY 110 MHz REFERENCE LEVEL --50 dBm SPAN/DIV 5 MHz RESOLUTION B...
Page 166 - Table 4- 8: Sensitivity Settings at 1800 MHz; Res BW; Sensitivity at 1.8 GHz
Performance Verification 4- 14 2715 Spectrum Analyzer Service Manual 9. Using Table 4--7, check the rest of the filters with and without the preampenabled. If necessary, use an external attenuator to reach a --139 dBm setting. Check with Preamp OFF as specified in Table 4--8. 1. Recall default power...
Page 167 - Sensitivity at 2.15 GHz
Performance Verification 2715 Spectrum Analyzer Service Manual 4- 15 Check with Preamp OFF as specified in Table 4--9. 1. Recall default power up settings by pressing UTIL 1 1. 2. Select the following settings on the Spectrum Analyzer: FREQUENCY 2.15 GHz REFERENCE LEVEL --30 dBm SPAN/DIV ZERO SPAN R...
Page 169 - Intermodulation
Performance Verification 2715 Spectrum Analyzer Service Manual 4- 17 3rd Order IM performance requirement is ≤ 70 dBc. H Test equipment required: Signal Generators (2)20 dB Pads (2)BNC T Adapter 1. Recall default power up settings by pressing UTIL 1 1 . 2. Connect the test equipment as shown in Figu...
Page 170 - Figure 4- 2: Harmonic Distortion Test Equipment Setup; Harmonic Distortion
Performance Verification 4- 18 2715 Spectrum Analyzer Service Manual 11. Reset the VERTICAL SCALE to 10 dB/. 12. Check that the 3rd Order IM products are ≤ --70 dBc. 13. Disconnect the test equipment from the RF INPUT. 2nd harmonic distortion performance requirement is ≤ --66 dBc. H Test equipment r...
Page 171 - SAVE ENABLE A; Hz Response Amplitude
Performance Verification 2715 Spectrum Analyzer Service Manual 4- 19 Performance requirement is ≤ --10 dBm. H Test equipment required: Signal Generator 1. Recall default power up settings by pressing UTIL 1 1 . 2. Select the following settings on the Spectrum Analyzer: FREQUENCY 100 MHz REFERENCE LE...
Page 172 - Figure 4- 3: 1 dB Compression Point Test Setup; dB Compression Point
Performance Verification 4- 20 2715 Spectrum Analyzer Service Manual Performance requirement is ≥ --15 dBm. H Test equipment required: 2 Signal GeneratorsCombiner3 SMA Male to BNC Female Adapters for Combiner 1. Recall default power up settings by pressing UTIL 1 1 . 2. Connect the test equipment as...
Page 174 - ZERO SPAN
Performance Verification 4- 22 2715 Spectrum Analyzer Service Manual Pin Signal 1 External Video Input 2 Sweep Gate 3 Chassis/Signal Ground 4 Sweep Ramp 5 Video Out 6 CLK0 Input 7 DATAI Output 8 DATAO Input 9 ᇓ DOLATCH Input 10 26.38 MHz Output 11 VLVL Input 12 SWPSLOPE Input 13 Not Used 14 Not Used...
Page 176 - SWEEP; Internal Calibrator
Performance Verification 4- 24 2715 Spectrum Analyzer Service Manual 2. Select the following settings on the Spectrum Analyzer: VERTICAL SCALE 10 dB/ DISPLAY STORAGE Off SWEEP RATE 1 ms/DIV 3. Enable external video by pressing DSPL 7 . The Spectrum Analyzer automatically selects ZERO SPAN. 4. Connec...
Page 178 - AM and FM Audio
Performance Verification 4- 26 2715 Spectrum Analyzer Service Manual Verify the proper operation of the AM and FM Audio Detectors with thefollowing procedure. H Test equipment required: AntennaHeadphones 1. Recall default power up settings by pressing UTIL 1 1 . 2. Connect the Antenna to the RF INPU...
Page 180 - Figure 4- 5: Test Equipment Setup for Checking Return Loss; VSWR
Performance Verification 4- 28 2715 Spectrum Analyzer Service Manual Performance requirement is 1.5:1 or better. Test equipment required: H All instruments except Option 50 - 75 Ω VSWR Bridge with 50 -- 75 Ω matching pad on RF in and RF out Test Spectrum Analyzer with Tracking Generator H Option 50 ...
Page 181 - Signal Track
Performance Verification 2715 Spectrum Analyzer Service Manual 4- 29 5. Press B--Save A on the test spectrum analyzer . A straight line will be at midscreen. This is the reference trace. 6. Connect the VSWR Bridge to the RF INPUT and set the REFERENCELEVEL to --20 dBm. 7. A frequency response wavefo...
Page 182 - GPIB Operation
Performance Verification 4- 30 2715 Spectrum Analyzer Service Manual If applicable to your 2715, use the following procedure to verify operation of theGPIB port. H Test equipment required: IBM PC/AT or Compatible, Hard Disk highly recommendedDOS Operating SystemMicrosoft QuickBASIC Programming Langu...
Page 183 - Video Monitor Mode and
Performance Verification 2715 Spectrum Analyzer Service Manual 4- 31 Use the following procedure to verify operation of the Video Monitor and TVLine Trigger features. 1. Recall default power up settings by pressing UTIL 1 1 . 2. Select the following settings on the Spectrum Analyzer: FREQUENCY 1038....
Page 185 - Video Demodulator and
Performance Verification 2715 Spectrum Analyzer Service Manual 4- 33 This procedure assures the proper operation of the Video Demodulator and thegated measurement circuitry. Since this is not a Performance Requirement,typical values are used throughout the procedure. H Test equipment required: PAL/N...
Page 187 - st LO Output Level
Performance Verification 2715 Spectrum Analyzer Service Manual 4- 35 10 dB/DIV 100 US/DIV (ANALOG DISPLAY) Figure 4- 8: IF Gating Check Waveform (NTSC Illustrated) 15. Press UTIL 5 2 8 to turn off gating. Performance requirement is ≥ 0 dBm. NOTE . This check applies only to Spectrum Analyzers equipp...
Page 189 - Adjustment Procedures; Static Discharge Precautions; Hold the IC devices by the body rather than the terminals.
2715 Spectrum Analyzer Service Manual 5- 1 Adjustment Procedures If the instrument performance is not within tolerance for a particular characteris-tic, determine the cause, repair if necessary, then use the appropriate adjustmentprocedure to return the instrument operation to performance specificat...
Page 190 - Recommended Test Equipment
Adjustment Procedures 5- 2 2715 Spectrum Analyzer Service Manual Recommended Test Equipment Table 5--1 lists test equipment and test fixtures recommended for the adjustmentprocedure. The characteristics specified are the minimum required for the checks.Substitute equipment must meet or exceed these ...
Page 192 - Preparation; Adjustments Requiring Flatness Correction
Adjustment Procedures 5- 4 2715 Spectrum Analyzer Service Manual Preparation Remove the cabinet as follows: 1. Turn the power OFF and remove the power cord. 2. Set the instrument on its face with the front cover installed. 3. Remove the rear cover (two T15 Torx-drive screws), two (front) top andbott...
Page 193 - Instrument Bottom View; Power Supply Board
Adjustment Procedures 2715 Spectrum Analyzer Service Manual 5- 5 Instrument Bottom View The following figure calls out many of the circuit board locations. Adjustment andtest point locations are shown for the power supply module and sweep board. Thisfigure will be referred to in following adjustment...
Page 194 - Adjustments; Section 1: Specifications; Power Supply and
Adjustment Procedures 5- 6 2715 Spectrum Analyzer Service Manual Adjustments Use the following procedures to bring the 2715 operating parameters within thetolerances specified in Section 1: Specifications . Two procedures are provided for adjusting the Power Supply and Deflectioncircuits. Check the ...
Page 195 - Power Supply
Adjustment Procedures 2715 Spectrum Analyzer Service Manual 5- 7 4. Set the test oscilloscope controls as follows: Channel 1Coupling AC Deflection Factor 20 mV/div Trigger Channel 1, positive edge Time Base 5 s/div 5. Place the Channel 2 probe near R680 on the Power Supply board. The testoscilloscop...
Page 198 - Enable the checkerboard pattern by pressing
Adjustment Procedures 5- 10 2715 Spectrum Analyzer Service Manual 7. Adjust R680 (LOCK) so that the waveform on TP270 is locked to thewaveform on TP250. An unlocked waveform exhibits a noticeable amount ofjitter. When the waveform locks, a sudden shift of the waveform occurs andthe jitter goes away....
Page 200 - Sweep and Horizontal
Adjustment Procedures 5- 12 2715 Spectrum Analyzer Service Manual 30. Adjust R705 (GEO) on the Power Supply board and VERT POS (R6) at therear panel for the straightest trace possible at the top edge of the screen. 31. Adjust R910 (VERT GAIN) on the Power Supply board to place the bottomof the trace...
Page 202 - Figure 5- 3: Properly Adjusted Checkerboard Pattern
Adjustment Procedures 5- 14 2715 Spectrum Analyzer Service Manual 4. Adjust R107 (HOG) for optimum one checkerboard square per division(edges of intensified squares positioned to left and right vertical graticulelines). 5. Repeat steps 3 and 4 to eliminate interaction. The checkerboard pattern willb...
Page 203 - MENUS
Adjustment Procedures 2715 Spectrum Analyzer Service Manual 5- 15 11. Adjust R63 (VOO) to center the readout between the top and bottomgraticule lines. 12. Enable the checkerboard by pressing UTIL 5 2 2 . 13. Adjust R174 (Vector Offset) to align the top intensified line of the checker-board with the...
Page 204 - Figure 5- 4: Locked 2nd LO and 5 MHz Bandpass Filter Adjustments; Locked 2; LO Preset
Adjustment Procedures 5- 16 2715 Spectrum Analyzer Service Manual Use this procedure to adjust C204 and R535 on the RF Mother board. See Figure 5--4 for the location of adjustments on the 2nd LO board. 1. Select the following settings on the Spectrum Analyzer: FREQUENCY 100 MHz REFERENCE LEVEL --30 ...
Page 205 - Bottom View; Phase Lock CFC
Adjustment Procedures 2715 Spectrum Analyzer Service Manual 5- 17 Use this procedure to adjust R931, R918, R920, R746, R827, R620, and C611on the Phase Lock assembly. H Test equipment required: Time Mark Generator Refer to Figure 5--5 for adjustment and test point locations excluding TP168 onthe Swe...
Page 209 - Figure 5- 6: Log Board Adjustment and Test Point Locations; Log Board Adjustment
Adjustment Procedures 2715 Spectrum Analyzer Service Manual 5- 21 Use the following procedure to adjust the Log Board. H Test equipment required: Signal Generator (Marconi 2022)10 dB and 1 dB Step AttenuatorsMultimeter (DMM)RF Cable, BNC to SMB Refer to Figure 5--6 for all adjustment locations on th...
Page 214 - Figure 5- 7: CAL Level Adjustment on Reference Oscillator Board
Adjustment Procedures 5- 26 2715 Spectrum Analyzer Service Manual H Option 50 instruments - Connect a 50 Ω coaxial cable to the signal generator output. Connect the Power meter head to the other end ofthe 50 Ω coaxial cable. Set the generator to a 100 MHz signal. Adjust the signal amplitude to -30.0...
Page 215 - MHz Resolution; Variable Resolution
Adjustment Procedures 2715 Spectrum Analyzer Service Manual 5- 27 i. Check that the peaks fall within 2 minor divisions of each graticule line. j. Press CTR-MEAS/TRKG . k. Check that the right hand readout indicates approximately C1.000KHZ. Use the following procedure to adjust the Variable Resoluti...
Page 216 - Figure 5- 8: RF Option Adjustment Locations
Adjustment Procedures 5- 28 2715 Spectrum Analyzer Service Manual g. Adjust C561, C544, C522, and C416 on the RF Options board (Figure 5--8)for highest amplitude, best filter shape, and centering about the stored30 kHz filter. C120 C233 C260 C270 C234 C252 C361 C450 C451 C522 C544 C561 C210 C416 C41...
Page 217 - Figure 5- 9: Variable Resolution Module Adjustment Locations
Adjustment Procedures 2715 Spectrum Analyzer Service Manual 5- 29 d. Select the following settings on the spectrum analyzer: FREQUENCY 100 MHz REF LEVEL --20 dBm SPAN/DIV 200 kHz RES BW 30 kHz VID FLTR Off VERT SCALE 10 dB/Div e. Save the display in one of the DISPLAY STORAGE registers. f. Reset the...
Page 218 - 0 kHz Resolution
Adjustment Procedures 5- 30 2715 Spectrum Analyzer Service Manual c. Recall default amplitude normalizations by pressing UTIL 5 5 2 9 Y . Press any menu button to exit the menu. d. Select the following settings on the Spectrum Analyzer: FREQUENCY 100 MHz REFERENCE LEVEL --20 dBm SPAN/DIV 100 kHz RES...
Page 222 - Flatness Adjustment
Adjustment Procedures 5- 34 2715 Spectrum Analyzer Service Manual Use the following procedure to adjust R160 and R172 on the Log board. H Test equipment required: Sweep GeneratorN male to N male coaxial cableHP11852 or equivalent 50 – 75 Ω min loss pad 1. Recall factory default power up settings by ...
Page 223 - Figure 5- 11: Presetting the Flatness Adjustments on the Log Board
Adjustment Procedures 2715 Spectrum Analyzer Service Manual 5- 35 Flatness Preset (Top View) R160 R172 Log Board Figure 5- 11: Presetting the Flatness Adjustments on the Log Board 6. Set the Sweep Generator Time to 0.1, variable fully clockwise, and power levelto 4. If the generator signal is too lo...
Page 224 - Service Normalization
Adjustment Procedures 5- 36 2715 Spectrum Analyzer Service Manual Use the following procedure to perform the Service Normalization. H Test equipment required: Signal GeneratorPower Meter10 dB and 1 dB Step Attenuator AssemblyTwo 6 dB AttenuatorsMin Loss Pad GAIN STEP REFERENCE Use the following proc...
Page 227 - Figure 5- 14: SW410 on the Reference Oscillator Board; Value; Setting of Reference
Adjustment Procedures 2715 Spectrum Analyzer Service Manual 5- 39 Use the following procedure to adjust SW410 on the Reference Oscillator board: H Test equipment required: 100 MHz Frequency Standard 1. Perform Internal Reference Frequency normalizations as detailed onpage 5--37. 2. When normalizatio...
Page 228 - Video Monitor Adjustment
Adjustment Procedures 5- 40 2715 Spectrum Analyzer Service Manual Use the following procedure to adjust R640 and R740 on the Sweep board. H Test equipment required: TV Visual Carrier SourceOscilloscope with ProbesMultimeter (DMM) 1. Press UTIL 0 to initialize instrument settings. Set SPAN/DIV to 2 M...
Page 230 - Figure 5- 16: Typical FM Adjustment Waveform
Adjustment Procedures 5- 42 2715 Spectrum Analyzer Service Manual h. Connect the oscilloscope test probe to TP8 on the Sweep board. i. Press Util 5 2 3 Util to stop the sweep at center screen. NOTE . Refer to Figure 5--16. This is a representation of what the waveform at TP8 would look like if the a...
Page 231 - DEMOD 3
Adjustment Procedures 2715 Spectrum Analyzer Service Manual 5- 43 o. Set the peak carrier level at the top graticule line. p. Enable the FM video mode by pressing DEMOD 3 , and set the LEVEL control for minimum flicker in the displayed picture. q. Adjust R740 on the Sweep board for best contrast in ...
Page 240 - Perform Service Normalizations; Amplitude Flatness
Adjustment Procedures 5- 52 2715 Spectrum Analyzer Service Manual The following procedure measures the instrument’s response over the inputfrequency range (15 MHz to 1000 MHz) to a known amplitude input. Once thisdata is available, it is transferred to the instrument operating system. Theoperating s...
Page 241 - Computer Setup and
Adjustment Procedures 2715 Spectrum Analyzer Service Manual 5- 53 For this adjustment the 2715 is controlled by a personal computer using theRS-232 or GPIB interface. The test equipment is controlled by GPIB. Ifnecessary, refer to the documentation provided with the GPIB interface card forinstallati...
Page 245 - Personal Computer
Adjustment Procedures 2715 Spectrum Analyzer Service Manual 5- 57 Use the following procedure to connect the PC to the instrument. 1. Connect the signal generator and power meter to the computer through GPIBcables. Connect the instrument to be tested to the computer through a GPIBor RS--232 cable. S...
Page 249 - Flatness Measurement
Adjustment Procedures 2715 Spectrum Analyzer Service Manual 5- 61 This section measures the instrument’s flatness response over the input frequencyrange and downloads that response to the instrument. This data is used by certainCATV measurements to correct for frequency related amplitude errors. All...
Page 252 - Troubleshooting Flatness Problems.
Adjustment Procedures 5- 64 2715 Spectrum Analyzer Service Manual RPT Results. The following is a description of the results of running RPT. If units are dBRef (CAL,TS) compute maximum error relative to the reference. Example: if absolute (maxError + minError) > absolute (minError -- RefError) er...
Page 255 - Maintenance; Static Sensitive Components
2715 Spectrum Analyzer Service Manual 6- 1 Maintenance This section describes procedures for preventive maintenance, troubleshootingmethods, corrective maintenance, and procedures for recalibrating thoseassemblies that normally do not require routine calibration. Static Sensitive Components This ins...
Page 256 - Semiconductor Classes; Preventive Maintenance; Cleaning
Maintenance 6- 2 2715 Spectrum Analyzer Service Manual Table 6- 1: Relative Susceptibility to Static Discharge Damage Semiconductor Classes Relative Susceptibility Levels 1 MOS or CMOS microcircuits or discretes, or linearmicrocircuitswith MOS inputs (most sensitive) 100 to 500 V ECL 200 to 500 V Sc...
Page 257 - Fixtures and Tools for
Maintenance 2715 Spectrum Analyzer Service Manual 6- 3 deionized water. Abrasive cleaners should not be used. If the circuit boardassemblies need cleaning, remove the circuit board by referring to the instruc-tions under Corrective Maintenance on Page 6--13. After cleaning, allow the interior to dry...
Page 258 - Figure 6- 1: Main Extender and Secondary Extender
Maintenance 6- 4 2715 Spectrum Analyzer Service Manual The Main Extender is to be used with all circuit boards that use the 50 conductormicroprocessor bus cable. The Secondary Extender card is added to the MainExtender for use with the Log and Phase Lock CFC boards. See Figure 6--1. Circuit Board Li...
Page 259 - After cleaning, carefully check the instrument for such defects
Maintenance 2715 Spectrum Analyzer Service Manual 6- 5 Square Pins BNC Connectors A B A B Figure 6- 2: Signal Steering Square Pins Conversely, an external signal may be injected on any one of these signal linesby removing the proper jumper on the signal line, selecting a BNC connector,and applying t...
Page 260 - Troubleshooting; Removing and Replacing Assemblies and Subassemblies; Troubleshooting Aids
Maintenance 6- 6 2715 Spectrum Analyzer Service Manual Performance Checks and Recalibration. The instrument performance should be checked after each 2000 hours of operation or every 12 months, if the instrumentis used intermittently, to ensure maximum performance and assist in locatingdefects that m...
Page 262 - Cal Debug Flags; Troubleshooting Steps
Maintenance 6- 8 2715 Spectrum Analyzer Service Manual The following are some general suggestions that may help isolate a problemwhen troubleshooting. 1. Ensure that the problem exists in the Spectrum Analyzer by checking theoperation of associated test equipment. 2. Try to isolate the problem to a ...
Page 263 - Message
Maintenance 2715 Spectrum Analyzer Service Manual 6- 9 Table 6- 2: Cal Debug Messages and Meanings Message Meaning “ERROR in REF GAIN STEP OFF: Cannot set external signalnear full screen” The signal could not be placed at or above full screen by reducingRF attenuation. “ERROR in REF GAIN STEP OFF: C...
Page 267 - Corrective Maintenance; Handling Static Sensitive Components.
Maintenance 2715 Spectrum Analyzer Service Manual 6- 13 Corrective Maintenance Corrective maintenance consists of component replacement and instrumentrepair. Special techniques and procedures that may be required to remove andreplace assemblies or components in this instrument are described here. Ha...
Page 268 - Replacing Surface
Maintenance 6- 14 2715 Spectrum Analyzer Service Manual Surface Mounted Components. Surface mounted components are used in this instrument. These components are mounted on pads on the circuit board, ratherthan through holes in the board. (In some rare instances, components may bemounted on pads arou...
Page 270 - Soldering Techniques
Maintenance 6- 16 2715 Spectrum Analyzer Service Manual NOTE . Disconnect the instrument from its power source before replacing or soldering components. Extreme caution must be used when removing or replacing components, becausethe instrument contains several multi layer circuit boards. Excess heat ...
Page 271 - Assembly Replacement Requiring Flatness Correction; Amplitude Flatness Adjustment Procedure; Turn the power off before removing an assembly.; Removing the Instrument
Maintenance 2715 Spectrum Analyzer Service Manual 6- 17 Assembly Replacement Requiring Flatness Correction Replacement of any of the following assemblies will require completion of the Amplitude Flatness Adjustment Procedure on Page 5--52. H RF Attenuator (A18) H 1st Converter (A16) H YIG Oscillator...
Page 273 - Replacing the CRT
Maintenance 2715 Spectrum Analyzer Service Manual 6- 19 Center Frequency Control Board Log Board Display Storage Board 1st LO Sweep Board Power Supply Board Microprocessor Board RF Deck Digital Options Board 1st LO Buffer Amplifier Assembly RF Options Video Demod Figure 6- 5: Assemblies Seen from th...
Page 274 - The CRT anode lead retains a high voltage charge after the instru-; Replacing the CRT Trace
Maintenance 6- 20 2715 Spectrum Analyzer Service Manual 3. Disconnect the CRT anode lead and discharge it to the main chassis. WARNING. The CRT anode lead retains a high voltage charge after the instru- ment is turned off. To avoid electrical shock, ground the anode lead to the mainchassis immediate...
Page 275 - Replacing the Front Panel
Maintenance 2715 Spectrum Analyzer Service Manual 6- 21 Use the following procedure to replace the Front Panel assembly: 1. Remove the instrument from its cabinet (see Removing the Instrument from its Cabinet on Page 6--17). 2. Remove the nut and washer from the RF INPUT connector (and from theTrack...
Page 277 - Figure 6- 7: Locations of J510 and J550 on the Phase Lock Assembly; Replacing the RF Deck
Maintenance 2715 Spectrum Analyzer Service Manual 6- 23 Use the following procedure to replace the RF Deck assembly: NOTE . Replacement of this assembly requires completion of the . Amplitude Flatness Adjustment Procedure on Page 5--52. 1. Remove the instrument from its cabinet (see Removing the Ins...
Page 280 - Replacing the 1
Maintenance 6- 26 2715 Spectrum Analyzer Service Manual Use the following procedure to replace the 1st LO Assembly: NOTE . Replacement of this assembly requires completion of the. Amplitude Flatness Adjustment Procedure on Page 5--52. 1. Remove the instrument from its cabinet (see Removing the Instr...
Page 284 - Replacing the RF Mother
Maintenance 6- 30 2715 Spectrum Analyzer Service Manual Use the following procedure to replace the RF Mother Board: 1. Remove the instrument from its cabinet. 2. Disconnect P100, P410, P400, P565, and P670 from the RF Mother board(Figure 6--8 on Page 6--24). 3. Remove the nut and washer from J100 on...
Page 287 - Maintenance Adjustments; Remove the small shield over part of the Phase Lock CFC board.; Replacing the Batteries
Maintenance 2715 Spectrum Analyzer Service Manual 6- 33 Use the following procedure to replace the battery on the Display Storage andGPIB or RS-232 boards. The Spectrum Analyzer uses two lithium batteries for nonvolatile memory. Onebattery is located on the Display Storage board, and the other on th...
Page 288 - Figure 6- 13: Location of R602 on the Phase Lock CFC Board; mV; Replace the shield on the Phase Lock CFC board.
Maintenance 6- 34 2715 Spectrum Analyzer Service Manual Interconnect plug to J11 on Power Supply Board is on opposite side R620 R602 U713 Figure 6- 13: Location of R602 on the Phase Lock CFC Board NOTE . If the beat note frequency is above 50 kHz, it will not be visible. 6. If the amplitude is great...
Page 289 - Options; Options A1 Through A5
2715 Spectrum Analyzer Service Manual 7- 1 Options This section describes the options available for the 2715 Spectrum Analyzer. There are five international power cord options offered for the 2715 SpectrumAnalyzer. The physical descriptions of the power cord plugs follows. Forreplacement purposes, r...
Page 290 - 074 Inverter and 2705 Battery Pack Instruction Manual
Options 7- 2 2715 Spectrum Analyzer Service Manual This is a no cost option that adds the IEEE Standard 488 General PurposeInterface Bus (GPIB). The pertinent circuits are located on the Digital Optionboard. The GPIB port consists of three compartments. They are the generalpurpose interface bus cont...
Page 293 - Replaceable Electrical Parts; Parts Ordering Information; Part number; Using the Replaceable Electrical Parts List
2715 Spectrum Analyzer Service Manual 8- 1 Replaceable Electrical Parts This section contains a list of the electrical components for the 2715. Use thislist to identify and order replacement parts. Parts Ordering Information Replacement parts are available through your local Tektronix field office o...
Page 294 - Column
Replaceable Electrical Parts 8- 2 2715 Spectrum Analyzer Service Manual Parts List Column Descriptions Column Column Name Description 1 Component Number The component number appears on diagrams and circuit board illustrations, located in the diagramssection. Assembly numbers are clearly marked on ea...
Page 295 - Manufacturer
Replaceable Electrical Parts 2715 Spectrum Analyzer Service Manual 8- 3 Manufacturers Cross Index Mfr.Code Manufacturer Address City, State, Zip Code D5243 ROEDERSTEIN ERNST GMBH LUDMILLASTRASSE 23 8300 LANDSHUT GERMANY S3774 OSHINO ELECTRIC LAMP WORKS LTD 5 2 MINAMI SHINAGAWA 2 CHORE SHINAGAWA KU T...
Page 296 - Address
Replaceable Electrical Parts 8- 4 2715 Spectrum Analyzer Service Manual Manufacturers Cross Index (Cont.) Mfr.Code City, State, Zip Code Address Manufacturer 02289 HI--G CO INC SUB OF NYTRONICS INC 101 LOCUST ST HARTFORD CT 06114--1504 04222 AVX/KYOCERA DIV OF AVX CORP 19TH AVE SOUTH P O BOX 867 MYR...
Page 439 - Using the Replaceable Mechanical Parts List
2715 Spectrum Analyzer Service Manual 10- 1 Replaceable Mechanical Parts This section contains a list of the replaceable mechanical components for the2715. Use this list to identify and order replacement parts. Parts Ordering Information Replacement parts are available through your local Tektronix f...
Page 440 - Abbreviations
Replaceable Mechanical Parts 10- 2 2715 Spectrum Analyzer Service Manual Parts List Column Descriptions Column Column Name Description 1 Figure & Index Number Items in this section are referenced by figure and index numbers to the exploded viewillustrations that follow. 2 Tektronix Part Number U...
Page 469 - Diagrams and Circuit Board Illustrations
2715 Spectrum Analyzer Service Manual i Table of Contents General Safety Summary iii . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Service Safety Summary v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diagrams Diagrams and Circuit Board Illustration...
Page 470 - A15A1 Power Supply Front (sections C and D)
Table of Contents ii 2715 Spectrum Analyzer Service Manual A15A1 Power Supply Front (sections C and D) 9-- 183 . . . . . . . . . . . . . . . . . . . . . . . . A15A1 Power Supply Back (sections A and B) 9-- 184 . . . . . . . . . . . . . . . . . . . . . . . . . A15A1 Power Supply Back (sections C and ...
Page 475 - vii; Cable TV RF Measurement Software Manual
2715 Spectrum Analyzer Service Manual vii Preface This manual contains service information for the 2715 Spectrum Analyzer. Theservice information is located in two volumes. Volume 1 contains the mainte-nance procedures and parts lists. Volume 2 contains the component locators andschematic diagrams. ...
Page 477 - Symbols
9- 1 2715 Spectrum Analyzer Service Manual Diagrams and Circuit Board Illustrations This section contains the troubleshooting procedures, block diagrams, circuit board illustrations,component locator tables, waveform illustrations, and schematic diagrams. Symbols Graphic symbols and class designatio...
Page 480 - A18 RF Attenuator Component Locator
2715 Spectrum Analyzer Service Manual 9- 4 C110 A-1 1B2 C111 A-1 1C2 C112 A-1 1C2 C138 C-1 1A4 C143 D-1 1A4 C144 D-1 1A4 C145 D-1 1D5 C151 D-1 1D5 C210 B-2 1B3 C220 B-2 1B4 C222 B-3 1B3 C225 B-2 1B5 C228 B-3 1B4 C230 C-2 1D2 C232 C-3 1B5 C233 B-1 1B6 C235 C-2 1D3 C238 C-3 1C2 C239 C-1 1D2 C240 C-2 1...
Page 481 - RF ATTENUATOR
9- 5 2715 Spectrum Analyzer Service Manual 2715 1 RF ATTENUATOR A18
Page 482 - A16A1 1ST Converter Component Locator
2715 Spectrum Analyzer Service Manual 9- 6 Component Number A23 A2 R1234 Chassis-mounted components have no Assembly Number prefix—see end of Replaceable Electrical Parts List. COMPONENT NUMBER EXAMPLE Assembly Number Subassembly Number (if used) STATIC SENSITIVE DEVICES Circuit Number C105 A--4 1B5...
Page 483 - ST CONVERTER
9- 7 2715 Spectrum Analyzer Service Manual 1 1ST CONVERTER A16A1 2715
Page 484 - A16A2 RF Input Component Locator
2715 Spectrum Analyzer Service Manual 9- 8 Component Number A23 A2 R1234 Chassis-mounted components have no Assembly Number prefix—see end of Replaceable Electrical Parts List. COMPONENT NUMBER EXAMPLE Assembly Number Subassembly Number (if used) STATIC SENSITIVE DEVICES Circuit Number C151 A--1 1B5...
Page 485 - RF INPUT
2715 Spectrum Analyzer Service Manual 9- 9 1 RF INPUT A16A2 2715
Page 486 - A17 YIG Buffer Amplifier Component Locator
2715 Spectrum Analyzer Service Manual 9- 10 Component Number A23 A2 R1234 Chassis-mounted components have no Assembly Number prefix—see end of Replaceable Electrical Parts List. COMPONENT NUMBER EXAMPLE Assembly Number Subassembly Number (if used) STATIC SENSITIVE DEVICES Circuit Number C130 A--1 1C...
Page 487 - YIG BUFFER AMPLIFIER
9- 11 2715 Spectrum Analyzer Service Manual 1 YIG BUFFER AMPLIFIER A17 2715
Page 488 - A19A1 1ST LO Component Locator
2715 Spectrum Analyzer Service Manual 9- 12 Component Number A23 A2 R1234 Chassis-mounted components have no Assembly Number prefix—see end of Replaceable Electrical Parts List. COMPONENT NUMBER EXAMPLE Assembly Number Subassembly Number (if used) STATIC SENSITIVE DEVICES Circuit Number Front Back C...
Page 489 - ST LO INTERFACE
9- 13 2715 Spectrum Analyzer Service Manual 2715 1 1ST LO INTERFACE A19A1
Page 494 - A12A1 Phaselock CFC Component Locator; Figure 1-10: A12A1 Phaselock CFC Component Locator
2715 Spectrum Analyzer Service Manual 9- 18 C100 A-1 1C2 C101 A-1 1C2 C112 A-1 1B2 C120 B-1 1A2 C141 C-1 6A4 C150 C-1 6D5 C200 A-2 1C2 C201 A-2 1C2 C205 A-2 1C2 C211 A-1 1C3 C213 A-2 1C3 C214 A-2 1A2 C220 B-1 1B2 C221 B-1 1A4 C230 B-2 1B5 C231 B-2 1D5 C235 B-2 1B5 C240 C-1 2B4 C245 C-2 2B4 C251 C-2 ...
Page 495 - PHASELOCK CFC BOARD
9- 19 2715 Spectrum Analyzer Service Manual PHASELOCK CFC BOARD SIGNAL INTERCONNECT A12A1 2715 0
Page 497 - PHASELOCK CFC
9- 21 2715 Spectrum Analyzer Service Manual 2715 PHASELOCK CFC A12A1 1
Page 507 - PHASELOCK CFC POWER SUPPLY
9- 31 2715 Spectrum Analyzer Service Manual 2715 6 PHASELOCK CFC POWER SUPPLY A12A1
Page 508 - A12A2 HF VCO Component Locator
2715 Spectrum Analyzer Service Manual 9- 32 C103 A-1 1C6 C110 A-1 1B2 C111 B-1 1B2 C120 B-1 1B2 C133 C-1 1A2 C200 A-2 1B6 C204 A-2 1B6 C212 A-2 1A3 C222 B-2 1A2 C231 C-2 1A2 C224 B-2 1A4 C233 C-2 1A5 C234 C-2 1A5 C302 A-3 1B3 C310 A-2 1A4 C331 C-3 1A5 C332 C-3 1A5 C333 C-3 1C2 C404 A-3 1B3 C407 A-4 ...
Page 509 - HF VCO
9- 33 2715 Spectrum Analyzer Service Manual 2715 1 HF VCO A12A2
Page 510 - A12A3 LF VCO Component Locator
2715 Spectrum Analyzer Service Manual 9- 34 Component Number A23 A2 R1234 Chassis-mounted components have no Assembly Number prefix—see end of Replaceable Electrical Parts List. COMPONENT NUMBER EXAMPLE Assembly Number Subassembly Number (if used) STATIC SENSITIVE DEVICES Circuit Number C100 A-1 1D1...
Page 511 - LF VCO
9- 35 2715 Spectrum Analyzer Service Manual LF VCO A12A3 1 2715
Page 513 - A14 RF Mother Component Locator; Figure 1-14: A14 RF Mother Component Locator
9- 37 2715 Spectrum Analyzer Service Manual C100 A-2 4C3 C101 A-2 4C3 C121 A-1 1D4 C130 A-2 1C5 C131 A-2 1C5 C132 A-2 1D5 C133 A-2 1D5 C134 A-2 2C5 C140 A-2 2A4 C141 A-2 2A4 C142 A-2 2B4 C143 A-2 2B4 C144 A-2 2C5 C150 A-2 3A6 C150 A-2 3B6 C152 A-2 3B6 C153 A-2 3C6 C154 A-2 2C6 C155 A-2 3B6 C165 A-2 ...
Page 515 - SIGNAL INTERCONNECT
9- 39 2715 Spectrum Analyzer Service Manual SIGNAL INTERCONNECT RF MOTHER BOARD A14 0 2715
Page 521 - RF MOTHER
9- 45 2715 Spectrum Analyzer Service Manual 3 RF MOTHER A14 2715
Page 525 - A28 Video Demod Component Locator; Figure 1-16: A28 Video Demod Component Locator
9- 49 2715 Spectrum Analyzer Service Manual C1* A1 1B2 C10* A1 1B5 C12* A1 1B5 C13* A1 1B5 C14 A1 1B6 C15* A1 1B4 C16* A1 1B5 C17 A1 1B6 C18 A1 1C6 C19* A1 1B5 C2* A1 1B1 C20* A1 1C6 C21 A1 1B4 C22 A1 1B4 C23 A1 1B4 C24 A1 1B4 C25 A1 1C6 C26* A1 1C6 C27* A1 2B2 C28 A1 1B6 C29* A1 1D1 C3* A1 1B2 C30 ...
Page 529 - DEMOD 1
2715 Spectrum Analyzer Service Manual 9- 53 2715 1 A28 DEMOD 1 VIDEO DEMOD BOARD NOT USED
Page 531 - DEMOD 2
2715 Spectrum Analyzer Service Manual 9- 55 2 DEMOD 2 A28 VIDEO DEMOD BOARD 2715 1.21K NOT USED NOT USED 10.0K 10.0K 825 8.25K
Page 533 - A11 Digital Options Component Locator; Figure 1-18: A11 Digital Options Component Locator
9- 57 2715 Spectrum Analyzer Service Manual BT1 B1 2A3 C1 B3 1D4 C10 A1 1D6 C11 A3 1D6 C12 B1 1D4 C13 A2 1D4 C14 A1 1D5 C15 B3 1D5 C16 A1 1D5 C17 A1 1D5 C18 A1 1D5 C19 B1 1D5 C2 B1 1D4 C20 A2 1D6 C21 A2 1D6 C22 A2 1D6 C23 A2 1D6 C24 A1 2B4 C25 A1 4D4 C26 A1 2C3 C27 A3 3A5 C28 A3 3A5 C29 A3 5B2 C3 A1...
Page 537 - MICROPROCESSOR BUS INTERFACE
2715 Spectrum Analyzer Service Manual 9- 61 1 MICROPROCESSOR BUS INTERFACE DIGITAL OPTIONS BOARD A11 2715
Page 539 - PHASE LOCKED LOOP, EPROM AND NVRAM
2715 Spectrum Analyzer Service Manual 9- 63 2715 2 PHASE LOCKED LOOP, EPROM AND NVRAM A11 DIGITAL OPTIONS BOARD
Page 541 - DIGITAL OPTIONS BOARD
2715 Spectrum Analyzer Service Manual 9- 65 REAL--TIME CLOCK AND RS232 INTERFACE DIGITAL OPTIONS BOARD A11 3 2715
Page 543 - VIDEO GATING LOGIC AND GPIB INTERFACE
2715 Spectrum Analyzer Service Manual 9- 67 4 VIDEO GATING LOGIC AND GPIB INTERFACE DIGITAL OPTIONS BOARD A11 2715
Page 545 - IF GATE
2715 Spectrum Analyzer Service Manual 9- 69 2715 IF GATE A11 DIGITAL OPTIONS BOARD 5
Page 547 - A13 Variable Resolution Component Locator; Figure 1-20: A13 Variable Resolution Component Locator
9- 71 2715 Spectrum Analyzer Service Manual C103 A-1 3C6 C104 A-1 3B6 C105 A-1 3D5 C106 A-1 4B5 C110 B-1 4B5 C133 D-1 4B1 C135 D-1 4B2 C141 E-1 4B1 C147 E-1 4A2 C153 F-1 3D6 C154 F-1 2A4 C164 G-1 2B3 C165 G-1 3D6 C166 G-1 1C5 C170 G-1 1D5 C171 H-1 3D6 C172 H-1 1C2 C173 H-1 1D2 C182 I-1 3D5 C183 I-1 ...
Page 551 - VARIABLE RESOLUTION
9- 75 2715 Spectrum Analyzer Service Manual 1 VARIABLE RESOLUTION A13 2715
Page 557 - VARIABLE RESOLUTION A13
9- 81 2715 Spectrum Analyzer Service Manual 4 VARIABLE RESOLUTION A13 2715
Page 559 - A23 RF Option Component Locator; Figure 1-22: A23 RF Option Component Locator
9- 83 2715 Spectrum Analyzer Service Manual C100 A-1 1D3 C111 B-1 3A6 C120 B-1 3B4 C142 D-1 2B5 C150 E-1 2B5 C180 G-1 2A1 C191 H-1 1D3 C205 A-2 3C5 C206 A-2 3C5 C207 A-2 3C5 C208 A-2 3C5 C209 A-2 3C5 C210 A-1 3C4 C211 B-1 3B5 C220 B-1 3B5 C221 B-1 3B5 C222 B-1 3B5 C223 C-1 3B4 C230 C-1 3B4 C231 C-1 ...
Page 563 - RF OPTION
9- 87 2715 Spectrum Analyzer Service Manual 1 RF OPTION A23 2715
Page 570 - A7 Log Amp Component Locator; Figure 1-25: A7 Log Amp Component Locator
2715 Spectrum Analyzer Service Manual 9- 94 C152 D-1 6A5 C170 E-1 1B6 C171 E-1 1B6 C190 G-1 1C2 C191 G-1 1B3 C230 C--1 4B5 C232 C--2 4A4 C233 C-1 6C4 C240 C-1 6C4 C241 D-1 6A5 C242 D-1 6A5 C243 D-1 6A5 C250 D-1 6A4 C251 D-1 6C4 C252 E-1 6C4 C253 E-1 6C4 C254 D-2 6A3 C260 E-1 2B5 C270 F-1 1C6 C280 F-...
Page 571 - LOG AMP BOARD
9- 95 2715 Spectrum Analyzer Service Manual 2715 LOG AMP BOARD A7 SIGNAL INTERCONNECT 0
Page 575 - LOG AMP BOARD A7 2
9- 99 2715 Spectrum Analyzer Service Manual 2715 LOG AMP BOARD A7 2
Page 584 - A21 Reference Oscillator Component Locator
2715 Spectrum Analyzer Service Manual 9- 108 Component Number A23 A2 R1234 Chassis-mounted components have no Assembly Number prefix—see end of Replaceable Electrical Parts List. COMPONENT NUMBER EXAMPLE Assembly Number Subassembly Number (if used) STATIC SENSITIVE DEVICES Circuit Number C112 A--1 1...
Page 587 - REFERENCE OSCILLATOR
9- 111 2715 Spectrum Analyzer Service Manual 2715 1 REFERENCE OSCILLATOR A21
Page 592 - A10 Microprocessor Component Locator; Figure 1-29: A10 Microprocessor Component Locator
2715 Spectrum Analyzer Service Manual 9- 116 C110 A-1 8D2 C128 B-1 8A4 C174 E-1 7D6 C175 F-1 7C3 C183 F-1 7B3 C184 F-1 7D3 C210 A-1 8D2 C228 B-2 8B4 C261 D--2 1C3 C275 E-2 8B4 C280 F-2 8B4 C295 G-2 8A4 C310 A-2 8D2 C328 B-2 8A4 C361 D-3 1A2 C362 D-2 1A2 C365 E-2 8A4 C370 E-2 8A4 C380 F-2 8B4 C385 F-...
Page 593 - SIGNAL INTERCONNECT A10
9- 117 2715 Spectrum Analyzer Service Manual 0 SIGNAL INTERCONNECT A10 MICROPROCESSOR BOARD 2715
Page 595 - MICROPROCESSOR BOARD
9- 119 2715 Spectrum Analyzer Service Manual CLOCK, CPU, AND INTERRUPT CONTROLLER MICROPROCESSOR BOARD A10 1 2715
Page 597 - RAM
9- 121 2715 Spectrum Analyzer Service Manual RAM A10 MICROPROCESSOR BOARD 2 2715
Page 599 - ROM
9- 123 2715 Spectrum Analyzer Service Manual ROM A10 MICROPROCESSOR BOARD 3 2715
Page 601 - CONTROL
9- 125 2715 Spectrum Analyzer Service Manual 2715 CONTROL A10 MICROPROCESSOR BOARD 4
Page 603 - FREQUENCY COUNTERS
9- 127 2715 Spectrum Analyzer Service Manual 5 FREQUENCY COUNTERS MICROPROCESSOR BOARD A10 2715
Page 605 - FREQUENCY COUNTERS AND I/O SUBSYSTEM
9- 129 2715 Spectrum Analyzer Service Manual FREQUENCY COUNTERS AND I/O SUBSYSTEM A10 MICROPROCESSOR BOARD 6 2715
Page 607 - COUNTER INPUT SELECT
9- 131 2715 Spectrum Analyzer Service Manual COUNTER INPUT SELECT MICROPROCESSOR BOARD A10 7 2715
Page 609 - CONNECTORS AND DECOUPLING
9- 133 2715 Spectrum Analyzer Service Manual CONNECTORS AND DECOUPLING A10 MICROPROCESSOR BOARD 8 2715
Page 612 - A9 Display Storage Component Locator; Figure 1-32: A9 Display Storage Component Locator
2715 Spectrum Analyzer Service Manual 9- 136 BT1 A1 6B6 C1 A2 9B4 C10 A2 9C2 C100 A2 2B5 C101 A2 2B5 C102* A1 11B3 C103 A2 11B2 C104 A2 11C2 C11 A3 9B3 C12 A3 9C4 C13 B2 9C4 C14 A3 9D2 C15* A1 9C2 C16 B3 9B4 C17 B2 9C3 C18 A3 9B3 C19 A1 12C2 C2 A3 9C5 C20 A2 12C2 C21 B1 12C3 C22 B2 12C1 C23 A3 12D1 ...
Page 613 - SIGNAL INTERCONNECT A9
9- 137 2715 Spectrum Analyzer Service Manual 1 2715 SIGNAL INTERCONNECT A9 DISPLAY STORAGE BOARD
Page 615 - CONNECTORS
9- 139 2715 Spectrum Analyzer Service Manual (NOT USED)(NOT USED) (NOT USED) 2 CONNECTORS A9 2715 DISPLAY STORAGE BOARD
Page 617 - ADDRESS DECODING AND DATA BUFFERING
9- 141 2715 Spectrum Analyzer Service Manual ADDRESS DECODING AND DATA BUFFERING A9 2715 DISPLAY STORAGE BOARD 3
Page 619 - CONTROL REGISTERS A9 4
9- 143 2715 Spectrum Analyzer Service Manual CONTROL REGISTERS A9 4 2715 DISPLAY STORAGE BOARD
Page 621 - HORIZONTAL TRACKING A/D CONTROL
9- 145 2715 Spectrum Analyzer Service Manual 2715 5 A9 HORIZONTAL TRACKING A/D CONTROL DISPLAY STORAGE BOARD
Page 623 - VERTICAL DATA PROCESSING AND NVRAM
9- 147 2715 Spectrum Analyzer Service Manual 2715 6 A9 VERTICAL DATA PROCESSING AND NVRAM DISPLAY STORAGE BOARD
Page 625 - READOUTS AND WAVEFORM DRAWINGS A9
9- 149 2715 Spectrum Analyzer Service Manual 2715 READOUTS AND WAVEFORM DRAWINGS A9 DISPLAY STORAGE BOARD 7
Page 627 - HORIZONTAL INPUT
9- 151 2715 Spectrum Analyzer Service Manual UP/DOWN COMPARATORS HORIZONTAL INPUT BUFFER HORIZONTAL TRACKING DAC 2715 8 A9 HORIZONTAL INPUT DISPLAY STORAGE BOARD
Page 629 - VERTICAL INPUT AND ADC
9- 153 2715 Spectrum Analyzer Service Manual A/D CONVERTER REFERENCE (+2 VOLTS) --VR REFERENCE (+5 VOLTS) VERTICAL INPUT BUFFER VERTICAL FLASH ADC --VR REFERENCE (+5 VOLTS) 2715 VERTICAL INPUT AND ADC DISPLAY STORAGE BOARD A9 9
Page 631 - HORIZONTAL OUTPUT
9- 155 2715 Spectrum Analyzer Service Manual 10 HORIZONTAL OUTPUT DISPLAY STORAGE BOARD A9 2715
Page 633 - VERTICAL OUTPUT
9- 157 2715 Spectrum Analyzer Service Manual 11 A9 VERTICAL OUTPUT DISPLAY STORAGE BOARD 2715
Page 635 - MISCELLANEOUS
9- 159 2715 Spectrum Analyzer Service Manual 12 A9 MISCELLANEOUS DISPLAY STORAGE BOARD 2715
Page 636 - A6 Front Panel Component Locator
2715 Spectrum Analyzer Service Manual 9- 160 Component Number A23 A2 R1234 Chassis-mounted components have no Assembly Number prefix—see end of Replaceable Electrical Parts List. COMPONENT NUMBER EXAMPLE Assembly Number Subassembly Number (if used) STATIC SENSITIVE DEVICES Circuit Number C130 B-1 2D...
Page 639 - SWITCH MATRIX
9- 163 2715 Spectrum Analyzer Service Manual SWITCH MATRIX A6 FRONT PANEL BOARD 2715 1
Page 641 - OUTPUT SHIFT REGISTERS AND POTS A6
9- 165 2715 Spectrum Analyzer Service Manual OUTPUT SHIFT REGISTERS AND POTS A6 FRONT PANEL BOARD 2715 2
Page 643 - GRAY CODE AND SERVICE REQUEST/ACKNOWLEDGE
9- 167 2715 Spectrum Analyzer Service Manual GRAY CODE AND SERVICE REQUEST/ACKNOWLEDGE A6 FRONT PANEL BOARD 2715 3
Page 645 - INPUT SHIFT REGISTERS AND LEDS
9- 169 2715 Spectrum Analyzer Service Manual INPUT SHIFT REGISTERS AND LEDS A6 FRONT PANEL BOARD 2715 4
Page 647 - A5 Sweep Component Locator
9- 171 2715 Spectrum Analyzer Service Manual C130 A1 1C2 C150 A1 4A5 C160 A1 1C2 C161 A2 4A1 C165 A1 4A5 C176 A2 4C3 C210 A1 1D2 C220 A1 2B2 C230 A1 2B2 C231 A1 1D2 C252 A1 4B5 C253 A1 4B5 C262 A2 4B1 C310 A1 1D2 C311 A1 3C2 C322 A1 1D3 C383 A2 1D2 C384 A2 1D3 C391 A2 1D1 C410 A1 1D3 C420 A1 1D6 C42...
Page 651 - VIDEO BUFFERING A5
2715 Spectrum Analyzer Service Manual 9- 175 VIDEO BUFFERING A5 2715 SWEEP BOARD 1
Page 653 - VIDEO TRIGGER A5
2715 Spectrum Analyzer Service Manual 9- 177 2715 VIDEO TRIGGER A5 SWEEP BOARD 2
Page 655 - SERIAL CONTROL REGISTER
2715 Spectrum Analyzer Service Manual 9- 179 2715 A5 SERIAL CONTROL REGISTER SWEEP BOARD 3
Page 657 - SWEEP RAMP GENERATOR
2715 Spectrum Analyzer Service Manual 9- 181 2715 SWEEP RAMP GENERATOR SWEEP BOARD A5 4
Page 661 - Partial A15A1 Power Supply Component Locator
9- 185 2715 Spectrum Analyzer Service Manual B C D 1 2 3 4 A B D C Component Number A23 A2 R1234 Chassis-mounted components have no Assembly Number prefix—see end of Replaceable Electrical Parts List. COMPONENT NUMBER EXAMPLE Assembly Number Subassembly Number (if used) STATIC SENSITIVE DEVICES Circ...
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