Service manual

6-5
VL-H870U
VL-H875U
VL-H890U
VL-H870U
VL-H875U
VL-H890U
6-3-3. Adjusting the VCR circuit
• Test Points on the Video Circuit Board
a) POWER CIRCUIT ADJUSTMENT
PROCEDURE
6-3-3-1. Adjusting the power
circuit
Turn on power (camera).
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1. Adjust to CAM 15V.
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2. Check P-CON 4.9V.
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3. Check P-CON 3.3V.
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4. Check CAM 2.9V.
5. Check LCD 13.5V.
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6. Check LCD 7V.
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7. Check LCD -15.2V.
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8. Check LCD -7V.
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Æ Turn off power.
POWER CIRCUIT ADJUSTMENT METHOD
Æ Input 9V from DC Jack, and set the power switch to the camera side.
` Don't fail to fix the back light unit befor adjusting them.
1. Adjustment to CAM 15V
Make an adjustment so that the digital voltmeter indicates 15V
± 0.05V.
5. Checking of LCD 13.5V
Ascertain that the digital voltmeter indicates 13.5V ± 0.2V.
Measuring instrument Digital voltmeter
Measuring terminal TL905
Adjustment address 3EH
Standard 15V ± 0.05V
2. Checking of P-CON 4.9V
Check that the digital voltmeter indicates 4.9V ± 0.1V.
Measuring instrument Digital voltmeter
Measuring terminal TL901
Adjustment address
Standard 4.9V ± 0.1V
3. Checking of P-CON 3.3V
Ascertain that the digital voltmeter indicates 3.3V ± 0.1V.
Measuring instrument Digital voltmeter
Measuring terminal TL903
Adjustment address
Standard 3.3V ± 0.1V
4. Checking of CAM 2.9V
Ascertain that the digital voltmeter indicates 2.9V± 0.1V.
Measuring instrument Digital voltmeter
Measuring terminal TL907
Adjustment address
Standard 13.5V ± 0.2V
Measuring instrument Digital voltmeter
Measuring terminal TL910
Adjustment address
Standard 2.9V ± 0.1V
6. Checking of LCD 7V
Ascertain that the digital voltmeter indicates 7V + 0.4/-0.2V.
Measuring instrument Digital voltmeter
Measuring terminal TL904
Adjustment address
Standard 7V + 0.4/-0.2V
7. Checking of LCD -15.2V
Ascertain that the digital voltmeter indicates -15.2V ±1V.
Measuring instrument Digital voltmeter
Measuring terminal TL906
Adjustment address
Standard -15.2V ± 1V
8. Checking of LCD -7V
Ascertain that the digital voltmeter indicates -7V + 0.4/-0.7V.
Æ Turn off power supply.
Measuring instrument Digital voltmeter
Measuring terminal TL908
Adjustment address
Standard -7V + 0.4/-0.7V