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3-5
Part 3: Adjustment
2. ELECTRICAL ADJUSTMENTS
2.1 Fan Voltage Adjustment
Measuring equipment ............Digital voltmeter
Test point ..............................TP66A - ground
Enter the service mode.
1. Set adjustment item to "50". Set data value to "1". (Fan voltage minimum)
2. Set adjustment item to "67". Set data value to "1".
3. Adjust TP66A voltage to 8.4 V ± 0.1 V DC using VR5601.
4. Set adjustment item to "50". Set data value to "0". (Fan voltage maximum)
5. Set adjustment item to "67". Set data value to "1".
2.2 NRS Adjustment
Measuring equipment ............Oscilloscope
Test point ..............................TP-NRS1
Input mode ...........................Computer
Input signal ...........................16-step gray scale
Enter the service mode.
Adjust the waveform voltage at each point to the following value with the /- button.
Adjustment item
Adjustment value
22
Set part A of the waveform to 2.1 V ± 0.1 V DC.
1
23
Set part B of the waveform to 12.0 V ± 0.5 V DC.
Fig. 3-2
2.3 Signal Center DC Voltage Adjustment
Measuring equipment ............Digital voltmeter
Input mode ............................Computer
Input signal ...........................16-step gray scale
Enter the service mode.
Adjust the voltage at each test point to the following value with the /- button.
Item No.
Test point
Adjustment value
1
TP-R1
7.3V ± 0.05V DC
2
TP-G1
7.3V ± 0.05V DC
3
TP-B1
7.3V ± 0.05V DC
A
B
GND
Summary of Contents for D78-5241
Page 8: ...Part 1 General Information ...
Page 23: ...Part 2 Repair Information ...
Page 35: ......
Page 36: ...Part 3 Adjustment ...
Page 47: ...Part 4 Parts Catalog ...
Page 48: ......
Page 56: ...U 1 U 2 Z V 1 Page 4 CANON LV X1J LV X1U LV X1E REF No D78 5241 D78 5242 D78 5243 Y X ...
Page 59: ......
Page 60: ...Part 5 Electrical Diagrams ...