JVC DT-V2000SU Service Manual page 42

UI-VlUUUSU
■ ADJUSTMENT
B1 power supply adjustment
Test equipment
Signal generator(Cross-hatch pattern)
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DC voltmeter
Test points
TP-B1(TP-91):S1 connector (D pin [SUB DEF PWB]
TP-E(GND):S1 connector @ pin [SUB DEF PWB]
Adjustment locations
1. Set power supply voltage to 120V.
2. Input the VGA480 cross-hatch pattern signal to the INPUT C terminal, and switch RGB mode.
3. Confirm the B1 voltage that DC49V.
High voltage check
Test equipment
Signal generator(AII black signal)
High voltage meter
Test points
CRT Anode
Adjustment locations HIGH VOLTAGE ADJUST VR [SUB DEF PWB], DO01 (H.SIZE)
1. Connect the high voltage meter to the CRT anode.
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2. Set power supply voltage to 120V.
3. Input the all black signal of the 480P (31.47kHz / 60Hz) to the input A terminal.
4. Down the BRIGHT volume to black raster not to too bright.
5. Set the DO01 to 00.
6. If screen size is too big or small, then adjust the DO01, become the screen size about 95 %.
7. Adjust the HIGH VOLTAGE ADJUST VR so that the high voltage is at 27.5kV±0.2kV.
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Focus adjustment
Test equipment Signal generator(Cross-hatch pattern)
Test points
Adjustment locations
FOCUS VR1 ( FBT UPPER VOLUME)
FOCUS VR2 ( FBT MIDDLE VOLUME)
1. Input the 1080i cross-hatch pattern signal to the input A terminal.
2. Adjust the FOCUS VR1 and FOCUS VR2 so that the vertical and horizontal lines be clear and in fine detail.
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26 No.51519B