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Monitor Audio Vector Service Manual Page 63
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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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