Tektronix WFM91 - Manual

Tektronix WFM91

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Table of Contents:

  • Page 3 – WARRANTY
  • Page 5 – Service Assurance; Service Assurance Advantages
  • Page 7 – WFM 90 and WFM 91 Service Manual; Table of Contents
  • Page 8 – ii; Options
  • Page 9 – iii; List of Figures
  • Page 10 – iv
  • Page 11 – List of Tables
  • Page 13 – General Safety Summary; Only qualified personnel should perform service procedures.; To Avoid Fire or Shock Hazards:
  • Page 14 – Observe These Battery
  • Page 15 – in injury or loss of life.; Terms on the Product.; Symbols and Terms
  • Page 17 – WFM 90 & WFM 91 Service Manual; xi; Service Safety Summary; Do Not Service Alone.; Do not perform internal service or adjustments of this; Use Care When Servicing With Power On.; Dangerous voltages or currents may
  • Page 18 – xii
  • Page 19 – xiii; Preface; About This Manual; This manual is composed of the following sections:; Related Manuals
  • Page 20 – xiv
  • Page 21 – xv; Introduction; Service Strategy; NOTE; Service Offerings; Warranty Repair Service
  • Page 22 – xvi; Repair or Calibration
  • Page 23 – Before You Begin
  • Page 24 – xviii
  • Page 25 – Specifications
  • Page 27 – Product Description; Key Features
  • Page 28 – Description of Key
  • Page 30 – More Information
  • Page 31 – Characteristics Tables; Performance Requirement.; Req; Reference Information.; REF; Safety Standards
  • Page 32 – Table 1–1: Vertical deflection system
  • Page 33 – Table 1–2: DC restoration
  • Page 34 – Table 1–4: Horizontal deflection system; Table 1–5: Vector mode
  • Page 36 – Table 1–6: Synchronization
  • Page 37 – Table 1–9: Power source
  • Page 39 – Operating Information
  • Page 41 – This section contains the following information:; Installation; The WFM 90 or WFM 91 Handheld Waveform, Vector, Picture, and; Mechanical Installation
  • Page 42 – Figure 2–1: Installing the viewing hood; The optional desk stand provides the user with a stable means to; Figure 2–2: Installing the desk stand
  • Page 43 – Electrical Installation
  • Page 44 – The instrument front panel is illustrated in Figure 2–3.; Figure 2–3: Instrument front panel; Front Panel Controls
  • Page 45 – Display Mode Selection.
  • Page 46 – Side-panel Connectors
  • Page 47 – Figure 2–4: Instrument side panels; The DC IN power connector is a 2 mm plug which
  • Page 48 – Amplitude Alarm Mode.; The Amplitude Alarm mode provides a means to; Special Operating Modes
  • Page 49 – Readout Description.; Listed below are the corresponding descriptions of the
  • Page 50 – Table 2–1: Front panel and menu default settings; Default Settings
  • Page 51 – Theory of Operation
  • Page 53 – Block Diagram Description; The microprocessor takes input from the front-panel keypad to; Rasterizer and Graphics.; The rasterizer and graphics block produces all internally; Input Board
  • Page 54 – Backlight Power Supply
  • Page 55 – Figure 3–1: Simplified block diagram
  • Page 57 – Performance Verification
  • Page 59 – Summary Verification; Table 4–1: Summary verification procedure
  • Page 60 – Equipment Required; Table 4–2: Equipment required for performance verification
  • Page 62 – Performance Verification Procedures; Conventions
  • Page 63 – in-line terminator and dual-input coupler to the VIDEO IN and; Enter the Configuration menu and select the INPUT category.; Preliminary Setup
  • Page 65 – Vertical Gain and Vertical
  • Page 66 – Select X5 GAIN from the Operating menu.; signal using a 75; Select VAR GAIN OFF from the Configuration menu.; This procedure verifies the following requirement:; Remove the pulse and bar signal from the VIDEO IN connector.; Overscan
  • Page 67 – Input and DC Restorer
  • Page 69 – Vector Phase Stability
  • Page 70 – Figure 4–1: –3 dB marks on the vector graticule
  • Page 71 – Audio Gain and
  • Page 72 – Select 8 dBu from the Operating menu.
  • Page 73 – Adjustment Procedures
  • Page 75 – Summary Adjustment; Table 5–1: Summary adjustment
  • Page 76 – Table 5–2: Equipment required for performance verification
  • Page 78 – Plug the AC power adapter into the WFM 90 or WFM 91 Handheld; Perform the following steps to adjust the raster VCO:; Select RAST VCO from the Calibration menu.; Adjustment Methodology
  • Page 79 – Sweep Timing and
  • Page 80 – Vertical Gain and X5 Gain
  • Page 81 – Frequency Response
  • Page 82 – Vector Quadrature Phase
  • Page 83 – b. Select VEC GAIN from the Calibration menu, select CAL, and then; Figure 5–1: NTSC graticule showing the vector gain adjustment; Vector Gain and X5 Gain
  • Page 84 – Select the AUDIO display mode on the WFM 90 or WFM 91 Handheld; dBu graticule lines.; Audio Gain
  • Page 85 – Maintenance
  • Page 87 – Procedures for inspecting and cleaning the instrument; Preparation; Servicing Prerequisites
  • Page 88 – Electrostatic Damage
  • Page 89 – Inspection and Cleaning; To avoid damage to this instrument, do not expose it to sprays,; General Care
  • Page 90 – After Repair Adjustments; packaging materials are not available, follow these directions:; Visual Inspection
  • Page 91 – Removal and Replacement; To prevent damage to the instrument, disconnect the power adapter; Tools Required; Table 6–1: Tools required for module removal
  • Page 92 – Procedures; Table 6–2: Removal and replacement procedure list
  • Page 93 – Figure 6–1: Removing the top cover; Top Cover Assembly
  • Page 94 – Gently lift the top cover off of the bottom cover.; Install the six retaining screws using the Torx-tip screwdriver.; To avoid damaging the LCD display, do not touch the face of the; LCD Display Assembly
  • Page 95 – Disconnect the wires from the two backlight connectors.; disconnect the ribbon cable from the back of the display module.; Figure 6–2: Installing the LCD display cable
  • Page 97 – Figure 6–3: Installing the LCD display; To remove the LCD display padding, perform the
  • Page 98 – into the LCD display module.
  • Page 99 – Top Board Assembly
  • Page 100 – Figure 6–4: Installing the keypad; To remove the Top board shield, perform the following; Remove the two retaining screws from the top of the Top board.; To replace the Top board shield, perform the following procedure:
  • Page 101 – Figure 6–5: Installing the Top board shield; the mounting posts of the Top board.; Install the two retaining screws into the top of the Top board.
  • Page 102 – Bottom Board
  • Page 103 – Figure 6–6: Installing the Bottom board; To remove the Backlight board, perform the following procedure:; Gently pull the Backlight board from the back of the Bottom board.; To replace the Backlight board, perform the following procedure:; Install the Backlight board into the back of the Bottom board.; gently slide the boards into the bottom cover.; Backlight Board
  • Page 105 – Figure 6–7: Installing the battery cover; To remove the carrying strap, perform the following procedure:
  • Page 106 – Install the battery cover. Refer to Battery Cover on page 6–18.; Turnlock Stud and Bushing.; Remove the battery cover. Refer to Battery Cover on page 6–18.; Gently pull and rock the turnlock stud while holding the bushing.; Figure 6–8: Removal and replacement of the turnlock stud
  • Page 107 – Press the turnlock stud into the bushing.; Install the battery cover. Refer to Battery Cover on page 6–18.; Battery Cushion Pad.; To remove the battery cushion pad, perform the following; Batteries
  • Page 108 – Figure 6–9: Removing the NiCad battery pack; Carefully pull the batteries out of the battery compartment.
  • Page 109 – Figure 6–10: Installed polarity of alkaline batteries; Remove the six Torx screws from the bottom cover.; cover, carefully remove the bottom cover; Bottom Cover Assembly
  • Page 110 – Battery Power Connector.
  • Page 111 – Figure 6–11: Battery contact installation alignment; To replace the battery contacts, perform the following procedure:
  • Page 112 – Turnlock Stud Receptacle.; To remove the turnlock stud receptacle, perform the
  • Page 113 – Install the bottom cover. Refer to Bottom Cover on page 6–23.; Bottom Cover Electrical Shield.; Remove the bottom cover. Refer to Bottom Cover on page 6–23.; Battery Orientation Marker and Battery Cushion Pad.
  • Page 114 – Figure 6–13: Battery orientation marker position
  • Page 115 – Release the retaining latches on the side of the EMI suppressor.; Figure 6–14: Installing the EMI suppressor; AC Adapter EMI
  • Page 117 – Troubleshooting Procedures; List of equipment required to perform the procedures, this page; Table 6–3: Equipment required for troubleshooting
  • Page 118 – Battery-Fault Analysis; Remove the AC adapter from the WFM 90 or WFM 91 Handheld Wave-; See Batteries on page 6–21.; Use three jumper wires to connect two 30; , 3 W resistors and an external; and Below
  • Page 119 – Attach the voltmeter across test resistor #1 in Figure 6–15.; and Above
  • Page 120 – Low-Voltage Power Supply
  • Page 121 – Do not use a soldering iron larger than 18 W or you may damage the; Fault Symptom Table; Disconnect the AC adapter from the instrument.; Remove any installed batteries. See Batteries on page 6–21.; Secure the instrument circuit boards in the circuit board vise.
  • Page 122 – Table 6–5: Fault symptom table; Troubleshooting Flowcharts
  • Page 123 – Figure 6–17: Flowchart for no display
  • Page 124 – Figure 6–18: Flowchart for distorted waveform display
  • Page 125 – Figure 6–19: Flowchart for no vector display
  • Page 126 – Figure 6–20: Flowchart for bad audio display
  • Page 127 – Figure 6–21: Flowchart for no picture display
  • Page 128 – Figure 6–22: Flowchart for bad graticules and menus
  • Page 129 – Figure 6–23: Flowchart for all white display
  • Page 130 – Figure 6–24: Flowchart for untriggered waveform display
  • Page 131 – Figure 6–25: Flowchart for unlocked vector display
  • Page 132 – Figure 6–26: Flowchart for vector display jitter; Figure 6–27: Flowchart for distorted vectors
  • Page 133 – Figure 6–28: Flowchart for problems with the instrument controls
  • Page 134 – Figure 6–29: Flowchart for bad menus in the picture display
  • Page 135 – Figure 6–30: Flowchart for dim or blotchy display
  • Page 136 – Connector Diagram; Figure 6–32: Circuit board connector and pin locations
  • Page 139 – Options and Accessories
  • Page 140 – Accessories; Standard Accessories
  • Page 141 – Replaceable Parts
  • Page 143 – Replaceable Parts List; Parts Ordering Information; Part number; Module Servicing
  • Page 144 – Using the Replaceable Parts List; Table 8–1 describes each column in the replaceable parts list.; Table 8–1: Replaceable parts list column descriptions; Cross Index–Mfr. Code
  • Page 145 – Manufacturers Cross Index
  • Page 146 – Figure 8–1: Exploded view
  • Page 151 – Diagrams
  • Page 153 – Figure 9–1: Interconnect diagram
Loading the manual

Service Manual

WFM 90 and WFM 91
Handheld Waveform, Vector, Picture,
and Audio Monitor

070-8969-04

This document supports firmware version 1.00
and above.

Warning
The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to all safety summaries prior to
performing service.

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Summary

Page 3 - WARRANTY

WARRANTY Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanshipfor a period of one (1) year from the date of shipment. If a product proves defective during this warranty period, Tektronix,at its option, either will repair the defect...

Page 5 - Service Assurance; Service Assurance Advantages

Service Assurance If you have not already purchased Service Assurance for this product, you may do so at any time during the product’swarranty period. Service Assurance provides Repair Protection and Calibration Services to meet your needs. Repair Protection extends priority repair services beyond t...

Page 7 - WFM 90 and WFM 91 Service Manual; Table of Contents

WFM 90 and WFM 91 Service Manual i Table of Contents General Safety Summary vii . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Service Safety Summary xi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Preface xiii . . . . . . . . . . . . . . . . . ....

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