Monitor Audio Vector Service Manual Page 11
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- Table of contents
- TROUBLESHOOTING
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WFM90D and WFM91D Service Manual
vii
General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it.
To avoid potential hazards, use this product only as specified.
Only qualified personnel should perform service procedures.
While using this product, you may need to access other parts of the system. Read
the General Safety Summary in other system manuals for warnings and cautions
related to operating the system.
Connect and Disconnect Properly. Do not connect or disconnect probes or test
leads while they are connected to a voltage source.
Observe All Terminal Rat ings. To avoid fire or shock hazard, observe all ratings
and markings on the product. Consult the product manual for further ratings
information before making connections to the product.
Do not apply a potential to any terminal, including the common terminal, that
exceeds the maximum rating of that terminal.
Replace Batteries Properly. Replace batteries only with the proper type and rating
specified.
Recharge Batteries Proper ly. Recharge batteries for the recommended charge
cycle only.
Use Proper AC Adapter. Use only the AC adapter specified for this product.
Do Not Operate Without Covers. Do not operate this product with covers or panels
removed.
Use Proper Fuse. Use only the fuse type and rating specified for this product.
Avoid Exposed Circuitry. Do not touch exposed connections and components
when power is present.
Do Not Operate With Suspected Failures. If you suspect there is damage to this
product, have it inspected by qualified service personnel.
Do Not Operate in Wet/Damp Conditions.
Do Not Operate in an Explosive Atmosphere.
Keep Product Surfaces Clean and Dry.
- Service Manual 1
- WFM90D and WFM91D 1
- Handheld Waveform, Vector 1
- Picture, and Audio Monitor 1
- 071-1143-01 1
- WARRANTY 3
- Table of Contents 5
- Adjustment Procedures 6
- List of Figures 8
- List of Tables 10
- General Safety Summary 11
- Symbols and Terms 12
- Service Safety Summary 13
- About This Manual 15
- Related Manuals 15
- Contacting Tektronix 16
- Specifications 17
- Characteristics Tables 20
- Electrical Specifications 20
- Table 1- 2: DC restoration 22
- Table 1- 3: Audio mode 23
- Table 1- 5: Vector mode 24
- Table 1- 6: Synchronization 25
- Table 1- 7: Power source 25
- Physical Characteristics 26
- Environmental Characteristics 26
- Certification and Compliances 27
- Operating Information 29
- Installation 31
- Desk Stand 32
- Travel Case 33
- Electrical Installation 34
- Replacing the Alkaline 35
- Functional Overview 37
- Figure 2- 6: WFM90D keypad 38
- Menu Control 39
- Arrow Buttons 39
- Instrument Reset 40
- DC IN 11-18V 41
- Using the Menus 45
- Operating Menus 47
- Vector Menu 48
- Audio Menu 49
- Picture Menu 49
- WIP Menu 50
- (Waveform-in-Picture) 50
- Configuration Menu 51
- Line Select Menu 56
- Theory of Operation 57
- Top Board 60
- Performance Verification 63
- Summary V erification 66
- Equipment Required 67
- Sync Separation 69
- Overscan 72
- Vector Phase Stability 75
- Chrominance Bandwidth 76
- Check Sync Separation 79
- Check Frequency Response 80
- Adjustments 85
- Raster VCO 89
- Frequency Response 91
- Vector Quadrature Phase 93
- Vector Gain and X5 Gain Phase 93
- Audio Gain 94
- Vertical Gain 95
- Cable Margin 97
- Maintenance 101
- After Repair Adjustments 102
- Repackaging Instructions 102
- Remove and Replace 103
- Procedures 104
- Top Cover Assembly 105
- Remove Torx screws (6) 106
- LCD Display Assembly 107
- LCD - Newer Inst ruments 108
- LCD - Older Instruments 111
- Backlight 114
- Top Board Assembly 115
- Pull nub 116
- Top board 116
- Top Board Shield 117
- Bottom Board 119
- SDI Interface Board 121
- Backlight Board 122
- Input Board Assembly 124
- Battery Cover Assembly 125
- Turnlock Stud and 126
- Turnlock 127
- Battery cover 127
- Batteries 128
- Alkaline Batteries 129
- Bottom Cover Assembly 131
- Battery Contacts 132
- Turnlock Stud Receptacle 134
- Bottom Cover Electrical 134
- AC Adapt er EMI 137
- Suppressor 137
- Troubleshooting Procedures 139
- Battery-Fault Analysis 140
- Low -Voltage Power Supply 142
- Fault Symptom Table 143
- Troubleshooting Flowcharts 144
- Connector Diagram 159
- H NiMH battery pack 163
- H Viewing hood 163
- H Desk stand 163
- Accessories 164
- Replaceable Mechanical Parts 165
- Replaceable Parts List 167
- Abbreviations 168
- Mfr. Code to Manufacturer 168
- Cross Index 168
- Instrument Accessories 168
- Manufacturers Cross Index 169
- Diagrams 177
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