HP HP 85660B - Manuals

General Information Introduction This volume of the Troubleshooting and Repair Manual contains information for the troubleshooting and repair of the RF Section of the instrument. This information is combined in service sheets and indexed with tabs for quick reference. Also contained in this volume a...

n Schematic Diagram Replacement Procedures Replacement procedures are included for use in removing and replacing assemblies for repair.They are located in the following sections: A5 Front Panel Front Panel Removal and Repair A6 RF Module A6 RF Module Replacement A6Al Coaxial Switch and A6A17 300 MHz...

Major Assembly and Component Locations Major assembly and component location illustrations for the RF Section are located at the rear of this manual. Troubleshooting Troubleshooting information for the RF Section is divided into three levels as follows: Instrument Level Spectrum Analyzer Overall Tro...

2. Using a clean cloth, dry the contacts by wiping from their inside to outside edge. This prevents particles from building up on the contact edges. Caution Do not use erasers to clean the edge connectors. They cause microscopic damage to the contact surface, removing the thin gold plating and expos...

Table 2. Cross-Reference Between ASCII, Decimal, and Binary Address Codes ASCII Character Decimal Value 5-Bit Binary Equivalent @ SP 00 00000 A ! 01 00001 B ” 0 2 00010 C # 0 3 00011 D $ 04 00100 E % 05 00101 F & 06 00110 G ’ 07 00111 H ( 08 01000 I > 09 01001 J * 10 01010 K + 11 01011 L ’ 1 ...

A6 A5 A4 A3 A2 Al I S w i t c h i n D o w n P o s i t i o n = L o g i c 1 I n d i c a t e s S w i t c hi n D o w n P o s i t i o n Figure 1. HP-IB Address Switch (Shown in Factory Preset Position) The HP-IB address may also be changed from the front panel or programmed via a controller using a speci...

NOTE F r o n t h a n d l e s m u s t b e m o u n t e d f o r s h i p m e n t . Figure 2. Packaging for Shipment Using Factory Packaging Materials Recommended Test Equipment A list of recommended test equipment is contained in the HP 8566B Performance Testsand Adjustments Manual (HP Part Number 08566...

0 300000000000000000 18 X 2 25 X 2 I t e m H P P a r t N u m b e r 1 85660-60114 2 85662-60088 3 08505-60042 4 8 5 6 8 0 - 6 0 0 3 4 5 08565-60107 6 08505-60041 7 85680-60093 8 1250-0669 C D 5 4 8 2 8 7 3 9 0 8 15 2 D e s c r i p t i o n 1 EXTENDER BOARD: Al2 RF SECTION INTERFACE 1 PC BOARD: DISPLAY...

GRAPHIC SYMBOLS USED ON SCHEMATIC AND BLOCK DIAGRAMS B A S I C C O M P O N E N T S Y M B O L S O R Figure 5. Graphic Symbols (1 of 2) General Information 11

GRAPHIC SYMBOLS USED ON SCHEMATIC AND BLOCK DIAGRAMS B A S I C C O M P O N E N T S Y M B O L S ( C O N T I N U E D ) - c - c - - B S 6 C O M M O N L Y U S E D A S S E M B L Y A N D C I R C U I T S Y M B O L S B A S I C L O G I C S Y M B O L S Q Figure 5. Graphic Symbols (2 of 2) 12 General Informati...

Schematic Symbols for Digital Integrated Circuits The following is a guide to the symbols used for digital or logic in this manual. The symbology is based upon American National Standard ANSI Y32.14, Graphic Symbols for Logic Diagrams (Two-State Devices), but does not strictly follow the standard. F...

Notes 1. The suffix or subscript 0 denotes the least significant bit (LSB) of a data or address word. 2. Letters may be used to identify a line or logic element without indicating a specific logic function. For example: - - - A - - - B - C MUX l A l B 0 l c T r i p l e Z - C h a n n e l M u l t i p ...

The F line label is used to indicate S-state logic. The S-state enable i:F and numerals or letters are used as with the G label: C o u n t e r w i t h O u t p u t s 3 - S t a t - > c - R CTR nput is with an e B u f f e r s F Figure 6. Schematic Symbols for Digital Integrated Circuits (7 of 7) Wei...

Overall Troubleshooting This chapter contains information that will help to identify the system of the spectrumanalyzer that is not operating correctly. Table 1, “Troubleshooting Index,” may be used to locate troubleshooting information in the RF and IF Display Troubleshooting and Repair Manuals. Th...

Table 1. Troubleshooting Index Troubleshooting Information Tab Title or Location Start Frequency Tuning Equations and RF Section Analog Troubleshooting Phase Lock Block DiagramDiagnostic Functions Spectrum Analyzer Overall Troubleshooting Digital Storage A3 Digital Storage Block Diagram Display Syst...

Table 1. Troubleshooting Index (continued) Troubleshooting Information A3A8 Analog-Digital-Converter* A3A9 Track and Hold* A4Al Video Processor* A4A2 Log Amplifier-Detector*A4A3 Log Amplifier-Filter*A4A4 Bandwidth Filter A4A5 Step Gain*A4A6 Down/Up Converter*A4A7 3 MHz Bandwidth Filter A4A8 Attenuat...

Special Messages As a convenience to the operator and as an aid in servicing, eleven messages can appear inthe upper right corner of the CRT display. (Ten of these messages are shown in Figure 1.) Five of the messages inform the operator of possible erroneous data from improper instrument operation....

PLl The PLLl Phase Lock Loop is unlocked. Items to check are: n AlOAl - Check signal out at AlOAlJ3. n AlOA2 - Check signal in at AlOA2J2. n A10A3 - Check signal out at AlOA3J3. n AlOA4 - Check signal out at AlOA4J2 and in at AlOA4J4. PLL2 The PLL2 Phase Lock Loop is unlocked. Items to check are: n ...

HET UNLOCK The RF Module Phase Lock Loop is unlocked. Items to check are: n CAL OUTPUT n A6A9 - Check voltage at A6A9J4. n A6A4 - Check 3.3 GHz output of A6A4. F R E Q U E N C Y D I A G N O S T I C S B L O C K TRACE DETECT I ON I N D I C A T I O N A C T I V EF U N C T I O NBLOCK S P E C I A L MESSAG...

Frequency Diagnostics REF This function displays many of the internal frequency control parameters in the upper left corner of the CRT display. (See Figure 1.) These parameters are the programmed values determined by the Al5 Controller. For example, following an a (KSR) might display the following v...

Trace A displays negative peaks. (SHIFT) Trace A displays sampled data. ( S H I F T ) T r a c e T T r a c e A ( k s a ) r e t u r n s t o t h e n o r m a l a u t o m a t i c d e t e c t i o n m o d e s a n d removes the CRT indication. Error Correction Routine The internal Error Correction Routine a...

Table 2. Error Correction Routine Parameters Parameter Specification Troubleshooting Information 23 4 5 678 9 10 1112 1 31 4 15 1 61 718 1 9 20 2 1 2 2232 425 26 2 72829 3 031 LOG and LIN scale, BW LOG 10 db/LOG 5 dB/ LOG 2 dB/ LOG 1 dB/RES BW = 3 MHz 1 MHz 300 kHz 100 kHz 30 kHz 10 kHz 3 kHz 1 kHz ...

Sweep System Block Diagram Description The HP 8566B Spectrum Analyzer sweep system consists of the following modes: Continuous Sweep; Free Run Trigger Several different assemblies are involved in the HP 8566B sweep system. The Al6 Scan Generator generates the 0 to 10 V sweep ramp. The ramp converter...

Triggered Sweep The triggered sweep modes are very similar to free run operation except that instead of the Al5 Controller outputting a set HSWP command to the A3Al Trigger assembly, it outputs atrigger enable command. The output of the trigger select circuit (line, external, or video) then clocks t...

up to greater than 10 V. If the ramp waveform is correct, check the A3A8 ramp converter. Otherwise check the ramp generator on A16. Isolate Digital Storage Processor Section If HSWP Stays High (SWEEP LED ON) With the sweep ramp disconnected from A3A8Jl and A3A8TPl jumpered to A3A8TP2,check RSHS outp...

Table 3. Mnemonics Listing for RF Section (continued) Mnemonic LSAS LSBYLSRQ LSTP LSTS LTGRLTIO LYSPM l - 5N l - 6N DAC* N RFD* REN*RPGlRPG2SAT1SAT2SRQ*SW1SW2 --- -- Active Description State LOW Scan Attenuator Strobe HIGH Standby L O W Service Request LOW Stop Al5 Controller L O W Scan Time Strobe ...

A l 6 S C A N G E N E R A T O R RAMP CONVERTE 4 1 2 F R O N T - P A N E L I N T E R F A C E D I G I T A L S T O R A G E P R O C E S S O R Figure 4. Sweep System Block Diagram Overall Troubleshooting 15

Phase Lock Loops Principles of Operation General Description The fundamental RF signal input to the A6 RF Module (2 to 6.2 is generated by the YTO (YIG-Tu n e d Oscillator). This signal is phase-locked, through other phase-lock loops, to the A22 10 MHz Standard (internal crystal oscillator). The YTO...

Reference Loop (Part of A7) The Reference Loop is phase-locked to the A22 10 MHz Standard and its phase-locked outputs (10, 20, 100, and 400 MHz) are used as references for the Loop, the M/N Loop, and the Heterodyne Loop (part of A6). The 10 MHz signal is also used as an auxiliary rear-panel output....

reference from PLL2 in the Loop which is either applied directly to the YTO or divided down and summed into PLL2 and and then applied to the YTO. When the frequency span is less than 25 the loop gain of the YTO Loop is increased by approximately 10 to provide better performance. This is performed by...

Troubleshooting Information Troubleshooting Table Table 1 correlates CRT phase-lock error messages with the probable faulty phase-lock loopand associated assemblies. This is especially helpful in determining the faulty loop when more than one phase-lock error message is displayed. Table 1. Troublesh...

The equation for start frequency is: + Where: = Start Frequency B band number. KSR displays the value of B which varies from 0 to 4. When thedisplayed value is 0 (low band), use 1 as a multiplier. N N number for M/N Loop. KSR displays the value of N which varies from 11 to 32. = M/N loop frequency i...

and the YTO frequencies, refer to Table 2, M and N Numbers and Resulting Frequencies. Synthesizer Tuning When a start frequency change occurs, the YTO is pretuned near the new desired frequencyby the A19 Digital-Analog Converter and A20 Main Coil Driver. This places the YTO frequency 20 to 30 MHz be...

Phase Lock Loop Troubleshooting If one of the phase-lock error messages appears, a loop has failed. Start the troubleshooting procedure by determining if the malfunction is dependent on Center Frequency, Frequency Span, etc. Next, break the suspected loop and measure the power levels as indicated on...

A 6 R F M O D U L E I I I MHZ . I 300 II A 7 M / N R E F E R N C E 1 I I II I I I I I I I r I I I I I I I Simplified RF Block Diagram

Preliminary Checks Instrument Preset Check The two red INSTR CHECK light whenever the instrument is turned on or when is pushed. The main processor then performs a check of itself, a checksum verification of all ROMs on the Al5 Controller, a partial check of the Instrument Bus (50-wirebus), and a re...

“LONG Instrument Preset Check This check is very similar to the normal Instrument Preset Check: an additional processor check is performed, all of the RAM locations in Digital Storage Memory) are checked, and the RAM memory on the Al5 Controller is verified. Since these more extensive checks require...

A5 Front Panel, Circuit Description The A5 Front Panel comprises the Keyboard, Rotary Pulse Generator (RPG), Instrument Check indicator LINE power switch, STANDBY power indicator LED, and CAL OUTPUT connector and cable. The RF INPUT, LO OUTPUT, and 321.4 MHz IF INPUT and IF OUTPUT connectors are phy...

( 2 P L A C E S ) V I E W A 5 V I E W V I E W C V I E W D Figure 1. Front Panel Removal and Repair A5 3

L E D L E A D I D E N T I F I C A T I O N I N S T R C H E C K I STANDBY I N S T R C H E C K I I Figure 2. LED Removal and Repair 11. To replace signal input switches, or keys, proceed as follows. a. Loosen set screw in DATA control knob (RPG) using a number 4 wrench (HP part number 8710-0857) and re...

14. Secure IF Display Section to RF Section, replace bottom cover, and reconnect ac line cords. Figure 3. Keyboard Removal and Repair AS 5

Reference Designation HP Part Number C D 5060-9436 7 5060-9436 7 5060-9436 7 5060-9436 7 5060-9436 7 5060-9436 7 5060-9436 7 5060-9436 7 5060-9436 5060-9436 7 5060-9436 7 5060-9436 7 5060-9436 7 5060-9436 7 5060-9436 7 5060-9436 7 5060-9436 7 5060-9436 7 5060-9436 7 5060-9436 7 5060-9436 7 5060-9436...

A6 RF Module Replacement Note For location of hardware and cables referred to in this procedure, see Figure 1. Removal 1. Remove ac line cords, separate instrument sections, and remove top, bottom, and right side covers from RF Section. 2. Remove RF front panel. (See A5 Front Panel Removal procedure...

( 2 P L A C E S ) Figure 2. Coaxial Switch and 300 MHz BPF Replacement RF Attenuator Replacement Note For location of hardware and cables referred to in this procedure, see Figure 3. Removal 1. Remove front panel from RF Section. (See A5 Front Panel Section for front panel removal procedure.) 2. Rem...

Installation 11. Attach attenuator bracket to attenuator by replacing two screws 12. Place attenuator (attached to bracket) in RF Module. 13. Connect attenuator ribbon cable connector to motherboard connector. 14. Align attenuator connectors with cable connectors and tighten cable connectors. 15. Re...

1 Figure 3. Replacement of RF Attenuator (1 of 2) 2 P L A C E S ) 2 P L A C E S ) 6 A6

Second Converter Replacement Note For location of hardware and cables referred to in this procedure, see Figure 4. Removal 1. Remove ac line cords and RF Section bottom cover. 2. Disconnect connectors and single-pin connector and double-pin connector from Second Converter. 3. Disconnect the remainin...

PL ACE Figure 4. Second Converter Replacement First Converter Replacement Note For location of hardware and cables referred to in this procedure, see Figure 5. Removal 1. Remove ac line cords, IF-Display Section, and RF Section top cover. 2. Remove two screws to release First Converter from A6 RF Mo...

Figure 5. First Converter Replacement ( 2 P L A C E S ) 3.6 BPF, LPF, and LPF Replacement Note 3 For location of hardware and cables referred to in this procedure, see Figure 6. Removal 1. Remove ac line cords, separate instrument sections, and remove top and bottom covers from RF Section. 2. Remove...

R e f e r e n c e D e s i g n a t o r 31066029 8 5 6 6 0 - 6 0 1 0 1 2 0 3 5 5 5 6 6 0 - 6 0 1 2 1 4 1 0 5 0 8 6 7 2 4 8 9 50867133 1 50867247 8 1 50867226 3 50866226 1 3 5 6 6 0 - 6 0 2 5 6 6 3 5 6 6 0 - 6 0 2 2 6 3 5 6 6 0 - 6 0 2 5 3 3 5 6 6 0 - 6 0 2 0 2 3 5 6 6 0 - 6 0 3 2 2 3 5 6 6 0 - 6 0 2 3...

Last Converter, Circuit Description The Last Converter has three main purposes: 1. Converting the 321.4 MHz IF signal from the A6 RF Module down to 21.4 MHz for processing by the IF-Display Section. 2. Providing the means for correcting for variations in conversion loss versus frequency in the input...

Figure 1. Step Gain Amplifier, Simplified Schematic Amplitude Calibration Attenuator Q2 is an emitter follower buffer driving a second pin diode attenuator, CR11 to CR14. The current through CR11 and CR12 is determined by the front-panel control AMPTD CAL. The current through CR13 and CR14 is fixed ...

Last Converter Replacement Note For location of hardware and cables referred to in this procedure, see Figure 2. Removal 1. Remove ac line cords and RF Section bottom and right side covers. 2. Disconnect cables three from top of Phase Lock assembly and two from YTX Driver board. 3. Remove A6 RF Modu...

Amplifier/Coupler/Load Unit (ACLU) Replacement ( 4 P L A C E S ) 2 VIEW A \ ( 2 P L A C E S ) VIEW B Figure 2. ACLU Replacement L A C E S ) A0 5

YTX Current Driver Replacement Note For location of hardware and cables referred to in this procedure, see Figure 3. Removal 1. Remove ac line cords and RF Section bottom cover. 2. Disconnect 5-pin connector and ribbon cable from 3. Remove two screws and remove from RF Module. Installation 4. Place ...

YTX Replacement YTX Replacement Note I For location of hardware and cables referred to in this procedure, see Figure 4. Removal 1. Remove ac line cords, separate instrument sections, and remove top and bottom covers from RF Section. 2. Disconnect cable between All YTO Loop and RF Module. 3. Remove f...

HP Part Number 85660-60128 Current Driver Description Mfr Mfr Part Code Number 1 BOARD ASSEMBLY, YTX CURRENT DRIVER 85660-60128 1 CAP-FXD 25 V AL-ELCTLT 1 DIODE-SWITCHING 125V 175MA 60NS FDH444 1 DIODE-SWITCHING 125V 175MA 60NS DO-35 27014 FDH444 1 DIODE-SWITCHING 125V 175MA 60NS DO-35 27014 FDH444 ...

D S 2 GREEN O N = H E A T E R C O N T R O L S A T U R A T E D PC BOARD SIDE ( S I G N A L H E A T E R C O N N E C T I O N S ) D S 2 I I \ H E A T S I N K S I D E YTX Current Driver Component Locations, 85660-60128

Phase Lock, Circuit Description The Phase Lock has three major functions: 1. To provide a stable -10.0 100 MHz calibrator signal to the RF Section front panel. 2. To provide a 300 MHz local oscillator to the Last Converter assembly. 3. To phase-lock the 3.3 second local oscillator in the Second Conv...

Switch and Unlock Detector: When unlock occurs, the output of becomes low, causing to have a low output. The output of becomes positive, turning off Q5. If no lock occurs on the search ramp, the delay caused by resistor R27 and capacitor C37 keeps off until the next search cycle begins. This delay i...

I t e m 1 2 3 4 5 6 8 9 10 1 1 12 H P P a r t N u m b e r 2950-0177 2200-0140 2200-0109 85660-20204 85660-80061 2200-0148 1 D e s c r i p t i o n NUT, HEX, RF CONNECTOR (FOR WASHER, LOCK, RF CONNECTOR (FOR NUT, HEX, (FOR J4) WASHER, LOCK, ID (FOR COVER, FRONT, PHASE LOCK ASSEMBLY SCREW, MACH, 4-40, ...

Reference Designation HP Part Number C 7 0160-4574 1 0160-4574 1 26 a 6 0160-4494 4 0160-4494 4 6 62 6 6a 66 64 0160-4350 7 0160-4574 1 33 0121-0452 4 0160-4492 2 a 60 6 66 0160-4441 1 a 27 0160-4574 1 71 5 1 1 1 1 1 11 1 1 11 1 11 1 1 1 1 11 1 11 1 11 1 1 1 1 1 11 HP Part Number 85660-60202 Phase L...

Miscellaneous Bias/Relay Driver, Circuit Description This assembly is a collection of circuits necessary for proper operation of other assemblies inthe A6 RF Module. It contains nine circuits: 1. YTX Diode Bias 2. YTX Linearity Correction 3. 3.3 Oscillator Driver 4. PIN Switch Driver 5. Band Step Ga...

L B 2 R 4 2 L B 3 , q 2 ’ 3 2 2 4 4 R 7 0 , L B 4 Miscellaneous Bias/Relay Driver Component Locations,

Slope Generator, Circuit Description The slope generator takes a voltage which is proportional to YTX frequency and produces acurrent to control the slope attenuator in the Last Converter, which compensates for conversion loss variations of the input mixer within each frequency band. The slope gener...

This information is decoded by and amplified by U5. The outputs of U5 are approximatley V when a band is valid and approximatley -22 V otherwise. These signals are used to drive FET switches on the Slope Generator and the YTX Driver. Preselector Peak A second latch, receives the same six lines a but...

Figure 1. Variable Gain Amplifier, Simplified Schematic When the 20 K potentiometer is set to zero, the amplifier has a gain of when set to 20 K, the gain is and when set to 10 K, the gain is zero. to switch in different 20 K potentiometers for the five bands. The outputs for the two segments at U2 ...

2 0 K 1 OK A -3v A END Figure 2. Output Waveform START Figure 3. Output Waveform 4

HP Part Number 85660-60238 Slope Generator Reference HP Part Designation Number 0757-0438 3 0757-04380757-0200 7 0757-0346 2 0757-0346 2 2 2 3757-0465 6 3757-0280 39 1757-0442 9999 1757-0442 9 9 1251-0600 0 1251-0600 0 1251-0600 0 1251-0600 0 00 0 03 820-1281 826-0161 826-1058 3 820-1195820-1196 3 8...

YIG-Tuned Mixer (YTX) Driver, Circuit Description The YTX Driver receives a voltage proportional to the instrument LO frequency and produces a signal to control current in the YTX coil. Input Differential Amplifier This input signal to the YTX Driver comes from the A19 DAC and is -3 For example, as ...

Sample and Hold The output of the bandswitch drives preamp U5. U5 and together form an op amp with U5 a low-noise, low-temperature drift preamplifier. U5, and U6 are used in a sample and hold circuit as shown in Figure 2. Q15, a JFET, is used as the switch for the sample and hold. The switch is open...

YTX Drive Output Voltage divider R54 and R55 drive the output stage shown in Figure 3. and the output transistor are on YTX Current Driver. The YTX has a nominal coil sensitivity of 75 MHz/mA. R63 and R66 provide the means for compensating for variationsamount When the YTX center frequency is tuned ...

Since these RC combinations have long time constants, they cannot readily respond to the transients produced at band crossings and scan resets. Therefore, whenever the sample andhold circuit is holding, R24 to R26 are shorted by Q4 to respectively. V and -9 V Reference Supplies and and their associa...

Reference Designation HP Part Number C 85660-60235 I 0180-2205 0160-0571 c 0160-0571 C 0160-30970160-3879 7 0160-30970180-01970180-1735 2 0160-0571 C 0160-0571 C 0180-0197 a 0160-3097 1 0160-4084 a 0160-3097 1 0180-0229 7 0180-0116 1 0180-1746 5 0180-0116 7 1901-1067 4 1901-1067 4 1901-1067 4 1901-1...

A7 M/N Reference, Troubleshooting Reference All phase lock loops in the HP 8566B are referenced to the A22 10 MHz Frequency Standard. The 10 MHz Frequency Standard is used to directly phase-lock the 100 MHz VCXO only. All other phase lock loops receive their reference from either the or (10 and 20 M...

For example: If M = 26, N = 20, and VCO Frequency = 187.0 MHz, then M/N output frequency = N (VCO) = 20 x 187.0 = 3,740 MHz. If M is changed to 25,then the VCO frequency changes to 187.5 MHz, and the M/N output frequency changes to 3,750 MHz (20 x 187.5). Result 10 MHz change for M divider change of...

3. Remove clear plastic shield from motherboard (Figure 1) by removing all screws. Remove eight screws from the motherboard. Note Screws are marked on motherboard with the letter B for easy identification. C L E A R P L A S T I C S H I E L D Figure 1. A7 M/N Reference Removal and Installation 4. Pos...

Reference Phase Detector, Circuit Description The Reference Phase Detector contains the frequency divider, phase detector, and integrating amplifier for the 100 MHz Reference phase-lock loop. Basically, 100 MHz from the VCXO is divided by 10 and compared to the 10 MHz frequency reference by the phas...

Reference Phase Detector, Troubleshooting The Reference Phase Detector compares the output of the 10 MHz Frequency Standard to the output of the 100 MHz VCXO and provides the tuning drive voltage for the VCXO. A phase lock detector in indicates to the main processor (A15) the state of the Reference ...

Q2 Figure 1. Outputs of Phase Amplifiers Oscilloscope Settings Vertical 0.05 AC Horizontal 0.05 P r o b e Analyzer Settings INSTR PRESET Table 2. Phase Amplifier Voltage Levels Voltage Levels Emitter - 8 . 0 - 8 . 0 Base - 7 . 4 - 7 . 4 Collector - 3 . 6 - 3 . 6 Limiting Amplifier The Limiting Ampli...

Table 3. Limiting Amplifier Voltage Levels Pin Number dc Voltage Level 1 2 0.0 3 4 0.0 5 6 7 8 I Pulse Generator Typical input/output waveforms for the Pulse Generator are shown in Figure 2 and Figure 3. Figure 2. Pulse Generator Input Waveforms Oscilloscope Settings Vertical 0.1 Horizontal 0.2 X10 ...

Figure 3. Pulse Generator Output Pulses Oscilloscope Settings Vertical 0.1 Horizontal 0.05 P r o b eChannel A Pin 4 Analyzer Settings INSTR PRESET Buffer Amplifier Typical voltage levels for the Buffer Amplifier are shown in Table 4. Integrating Amplifier Typical voltage levels for the Integrating A...

Note The 100 MHz VCXO Tune Voltage can be measured at However, the voltage levels will be slightly lower than those listed above. Table 5. Integrating Amplifier Voltage Levels de Voltage Levels Pin 1 Pin 2 0.0 (locked) Pin 3 0.0 (no 10 MHz) Ref. (no 100 MHz) VCXO Pin 4 Pin 5 Pin 6 +o.o 25 E m i t t ...

HP Part Number 85660-60015 Reference Designation HP Number 0757-04210757-0440 0757-03940698-3446 0698-00850757-04420757-04420757-02800698-3154 0698-34530757-04420698-7285 3698-3157 3698-72343698-7257 3698-34463698-7246 1698-00851698-31321698-00851757-0421 1757-0416 1757-0289 820-0223 820-0429 902-30...

100 MHz Voltage-Controlled Crystal Oscillator (VCXO), Circuit Description consists of a 100 MHz voltage-controlled crystal oscillator, buffer amplifiers, and a frequency quadrupler. In conjunction with Reference Phase Detector, it forms the reference phase-lock loop. Outputs of 100 MHz and 400 MHz a...

100 MHz VCXO, Troubleshooting The 100 MHz VCXO supplies all of the fixed reference frequencies for the HP 8566B. Separate 100 MHz outputs are routed to the and assemblies. A 400 MHz signal is applied to the assembly. The assembly divides the 100 MHz input to provide 10 MHz and 20 MHz references. 100...

The second and third numbers are the M and N divide numbers respectively. The waveformat test points 3 and 7, 5 and 6, and 1 and 2 should be as shown in Figures 1, 2, and 3 respectively. The Center Frequencies for Figure la, lb, lc, and are 3.77 3.96 4.15 and 4.34 respectively. The M and N numbers a...

L E V E L S = E C L M o r N N u m b e r s o r 3 2 T P 3 T P 7 D U T Y b . M o r N N u m b e r s 25, or 29 D U T Y C Y C L E D U T Y a. I I I I I I I I I I I I I I I I I I I I I I I I I I I + I I I I I c . M o r N N u m b e r s d . M o r N N u m b e r s 26, or 30 27, or 31 T P 7 Figure 1. M and N Div...

Phase Frequency Detector and Preamplifier The Phase/Frequency Detector outputs pulses whose width is proportional to the phase difference of the two input signals. These pulses are filtered by the combination of and The Preamplifier amplifies these pulses which are representative of the phase differ...

Voltage-Controlled Oscillator The M/N voltage-controlled oscillator (VCO) consists of a resonator and with its associated circuitry. The oscillation frequency is determined by the bias on the varactors CR1 and CR2 which tunes the cavity resonator. Coarse tuning is provided by Cl, whileC5 is used to ...

Voltage-Controlled Oscillator (VCO) and Buffer Amplifier The VCO output frequency with the tuning voltage set to -14.2 V should be 380 MHz. Typical voltage levels for the VCO are as shown in Table 1. Table 1. Typical VCO Voltage Levels LO Output Amplifier Table 2. Typical LO Output Amplifier Voltage...

A8 Rectifier, Circuit Description Power is supplied to the instrument through the A9 Power Line Module, which containsthe line voltage selector, to the primary of transformer Three bridge rectifiers and one center-tapped secondary provide the rectified outputs. Diodes CR1 through CR4 form a bridge r...

RF Section Internal Fuse Replacement Note For location of hardware and cables referred to in this procedure, see Figure 1. Warning Remove ac line cord from both instruments before proceeding with thisprocedure. 1. Position instrument upside-down as shown in view A. 2. Remove feet from rear of RF Sec...

Transformer Replacement Note For location of hardware and cables referred to in the procedure, see Figure 2. 1. Remove ac line cords, IF-Display Section, and RF Section bottom cover, top cover, and right side cover. 2. Remove front panel. (See A5 Front Panel section for A5 Front Panel Removal proced...

C L E U ( 2 P L A C E S ) Figure 2. Transformer Replacement 4

For location of hardware and cables referred to in this procedure, see Figure 3. With ac line cords and RF Section bottom cover removed, proceed as follows: 1. Loosen rear cover by removing five screws 2. Power Transistors can now be easily replaced. V I E W A V I E W Figure 3. Power Transistor Repl...

1 1 9 P I 1 8 3 6 A6 Rectifier Component Locations,

Reference Designatior HP Number 85660-60276 0180-01970160-0574 0160-48320160-48920160-4892 0160-21990160-5609 0160-48350160-05730160-2199 0180-02910180-02910160-0575 0160-05750160-4835 0180-01970160-48350180-0291 0160-48350180-0197 0180-01970160-24370160-2437 1901-0033 1901-0376 1901-03761901-0033 1...

PLL 2 Phase Detector Reference Designation HP Part Number 1826-0059 2 1826-0059 2 1820-0429 8 1820-1212 9 1820-1425 6 1820-1194 6 1820-1194 6 1826-0448 3 1902-0041 44 1902-3002 3 1 1 1 1 11 1 11 Description IC OP AMP GP TO-99 PKG 27014 IC OP AMP GP TO-99 PKG 27014 IC V RGLTR-FXD-POS TO-39 PKG 27014 ...

R E A R V I E W A V I E W B Figure 1. Ail YTO Loop and YTO Replacement 2 A l l

1 2 A l A l I A 4 A l ( I n s i d e ) I N T E R C O N N E C T A l A l I A 7 A l A l Figure 2. All YTO Loop Assembly, Parts Identification (2 of 4) 4 A l l

R F S E C T I O N CABLE T O I N T E R C O N N E C T N O T E S : R E F E R E N C E A R E A B B R E V I A T E D . F O R C O M P L E T E R E F E R E N C E A B B R E V I A T I O N W I T H A S S E M B L Y D E S I G N A T I O N . 2 . O T H E R W I S E T O C A P A C I T O R S O N F O R S A M P L E R Al YTO...

Table 1. Mnemonics Listing for RF Section Mnemonic ADRO-4 ATN* BFC ON DAV* EOI* HLE2 HLEY HOVH H P O N H P U P HSTD HSWP HULH HULM EIULR HULY HXRF HYGH KCO-7 KRO-11 LADR LANR LAOS LDAS LIPS LLED LMNE L R M T LRTL Active State LOW L O W L O W L O W HIGH HIGH IIIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH H...

Al2 Front Panel interface *Indicates factoy-selected value Parts List Page 3 of 3

( P / O J 8 A23 Motherboard Instrument Bus, Interconnect Diagram

RAW GENERATOR I N S T R U M E N T B U S TEST AUX GUT OUT l SCAN OUT SCAN OUT Figure 1. Al6 Scan Generator, Simplified Block Diagram 4 A l 6

R F S E C T I O N A l 6 S C A N G E N E R A T O R 8 5 6 6 0 - 6 0 1 9 8 ( 1 O F 2 ) ( S E R I A L P R E F I X E S : N C N C IS IN I N D U C T A N C E I N U N L E S S O T H E R W I S E S I G N A L S E N T E R A T L E F T O R T O P E X I T A T S I D E O R B O T T O M O F B L O C K S . 4 “ 1 5 P I N A ...

R F S E C T I O N A l 6 S C A N G E N E R A T O R - - - - - P - - P - - - - - - - - - 8 5 6 6 0 - 6 0 2 4 7 ( 1 O F 2 ) ( S E R I A L P R E F I X : 2 4 4 9 A ) S I G N A L T O / F R O M F U N C T I O N B L O C K N C N C A N C N C N CN C N C N C B R E F E R E N C E T H I S A S S E M B L Y A R E A B B...

the output of is high, and CR12 is reverse biased. If the dc input voltage to the V supply is greater than V, then the voltage at pin 5 of is greater than V, and the output of is high. This turns on transistors Q13 and Q7, pulling the collector of Q7 to about V. This provides the HPUP signal. If any...

Al7 Positive Regulator Reference Designation Al7 11 1 11 11I 11 11 1 1 HP Part Number Description Mfr Mfr Part Code Number 9 1 BOARD ASSEMBLY, POSITIVE REGULATOR (SERIAL PREFIXES: 28480 85660-60275 3 1 CAPACITOR-FXO 35VDC TA 56289 1 1 CAPACITOR-FXD 35VDC TA 56289 5 1 CAPACITOR-FXD TA 56289 7 CAPACIT...

5. 6. 7. When installing new 10 MHz Standard, check that rear studs are supported by both rearrubber mounts and reconnect 87 (gray/violet) cable and 6-pin connector (red wire to rear pin). Fasten 10 MHz Standard to RF Section with two screws Replace All YTO Loop. Replace three screws removed in step...

R F S E C T I O N N 3 3 F R O M G N DF R O M G N DF R O M A 2 3 J J - 4 F R O M A 2 3 F R O M J J - 5 y - d - - - - - , - - - - - - - - - - - mI A 2 2 F R E Q U E N C Y S T A N D A R D A S S E M B L Y 5 0 6 2 - 1 9 1 6 ( S E R I A L P R E F I X : I - - - l I 1 5 0 6 2 - 1 9 0 9 ( S E R I A L i 5 0 6...

( P / O J 8 A23 Motherboard Instrument B US , Interconnect Diagram

Table 1. Reference Designations, Abbreviations, and Multipliers (1 of 4) REFERENCE DESIGNATIONS A Assembly F Fuse R T Thermistor AT Attenuator, Isolator, F L Filter S Switch Limiter, Termination HY Circulator T Transformer B Fan, Motor J Electrical Connector TB Terminal Board B T B a t t e r y (Stat...

Table 1. Reference Designations, Abbreviations, and Multipliers (2 of 4) D A P - G L D i a l l y l P h t h a l a t e Glass DBL Double D C D R Decoder D E G Degree D - H O L E D - S h a p e d H o l e DIA Diameter D I P Dual In-Line DIP-SLDR Dip Solder D - M O D E D e p l e t i o n M o d e DO D P D P ...

Table 1. Reference Designations, Abbreviations, and Multipliers (3 of 4) N N Nano, None N - C H A N N - C h a n n e l N H N M NO NOM NPN N S NUM NYL Nanohenry Nanometer, Nonmetallic Normally Open, N u m b e r Nominal Negative Positive Negative (Transistor) Nanosecond, Non-Shorting, Nose Numeric Nylo...

Table 1. Reference Designations, Abbreviations, and Multipliers (4 of 4) U UCD Microcandela UF Microfarad U H Microhenry Microliter, Underwriters’ Laboratories, Inc. U N H D N D U n h a r d e n e d V V VAC Variable, Violet, Volt, Voltage Vacuum, Alternating Current ABBREVIATIONS VAR Variable V D C V...

I 1 Table 2. Manufacturers Code List (continued) 9 0 0 3 1 8 General Parts Listing

Table 2. Manufacturers Code List (continued) General Parts Listing 9

Table 2. Manufacturers Code List (continued) 1 1 General Parts Listing 13

CABLE HP PART NUMBER CABLE LENGTH C M ( I N C H E S ) CABLE COLOR PLUG DESCRIPTION FOR USE IN COUNTRY PLUG TYPE * 250V 2 2 9 ( 9 0 ) 2 2 9 ( 9 0 ) M i n t G r a y M i n t G r a y G r e a t B r i t a i n , N i g e r i a R h o d e s i a , S i n g a p o r e , l n d i 250V 8 1 2 0 - 1 3 6 9 S t r a i g ...

RF Section Assemblies (continued) M/N General Parts Listing 19

RF Section Assemblies (continued) 20 General Parts Listing

RF Section Assemblies (continued) General Parts Listing 21

RF Section Assemblies (continued) 22 General Parts Listing

RF Section Cables (continued) 1 24 General Parts Listing

RF Section Cables (continued) General Parts Listing 25

RF Section Cables (continued) I 26 General Parts Listing

2 5 ( 8 P L A C E S ) ( 2 P L A C E S ) ( 2 P L A C E S ) 7 ( 2 P L A C E S ) ( 2 ( 2 P L A C E S ) ( 6 P L A C E S ) ( 2 P L A C E S ) ( 3 7 P L A C E S ) ( 2 ( 2 P L A C E S ) Figure 5. RF Section Parts Identification, Bottom View (1 of 3) 34 General Parts Listing

28480 2360-0115 2 5 28480 85660-2023 5 28480 85660-2008 3 85660-00075 28480 4 86701-00028 6 28480 5 28480 85660-0011. 28480 28480 28480 28480 5021-5837 2 28480 5021-5837 28480 86701-20006 2 28480 28480 2360-0331 12 2200-0103 2 28480 2200-0103 5 28480 14 28480 2360-0111 1 5 85660-00025 1 6 4 28480 85...

26 27 28 2360-0116 30 1400-0053 31 32 33 34 3 5 36 37 3 8 35660-0007: 1 2 1 3 14 1566620232 46 47 48 3050-0227 2420-0002 50 35660-0001: 51 52 6 6 3 5 4 3 2 8 6 7 4 3 4 8 53 35660-00004 6 28480 28480 28480 85660-0000: 28480 2360-0116 28480 1400-0053 28480 0520-0137 28480 28480 28480 28480 28480 85660...

( 2 ( 1 1 P L A C E S ) 2 4 ( 2 P L ( 8 P L A C E S ( 4 P L A C E S ) ( 4 P L A C E S ) ( 6 P L A C E S ) ( 2 P L A C E S ) Figure 6. RF Section Parts Identification, Top View (1 of 2) 38 General Parts Listing

Figure 7. RF Section Parts Identification, Front Panel, Front View (1 of 2) 40 General Parts Listing

Figure 7. RF Section Parts Identification, Front Panel, Front View (2 of 2) General Parts Listing 41

( 1 4 P L A C E S ) K E Y B O A R D 0 1 ( 3 P L A C E S ) 1 S T A N D B Y ) Figure 8. RF Section Parts Identification, Front Panel 42 General Parts Listing

Major Assembly and Component Locations Major Assembly and Component Locations Assembly ACLU Controller Coupler/Isolator/Amplifier (CIA) Digital Analog Converter (DAC) FM Coil Driver Fan First Converter Front Panel Front Panel Interface Interconnect Keyboard Last Converter Line Module M / N O u t p u...

A A 2 4 , A 2 3 ‘ M O T H E R B O A R D . R F M O D U L E M O T H E R B O A R D F I R S T C O N V E R T E R Figure 1. Major Assembly and Component Locations, Bottom View 2 Major Assembly and Component Locations

A l 8 A 1 9 A 2 0 A 2 1 A l 6 1 , A 1 2 A 2 2 A l I A 2 Al 1A l A l I A 7 A 1 0 A 8 Figure 3. Major Assemby and Component Locations, Top View 4 Major Assembly and Component Locations