Service manual

29
VL-A10U/UC/UA/UW/T/K
VL-AH30U/UC/T
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
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 P-CON 3.1V
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5. Check DSP 2.5V
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6. Check DSP 1.8V.
7. Check LCD 13.2V
8. Check LCD 7V
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9. Check LCD -15.2V
10. Check CAM -8V
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Æ Turn off power.
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1. Adjustment to CAM 15V
Make an adjustment so that the digital voltmeter indicates 15V
± 0.05V.
Measuring instrument Digital voltmeter
Measuring terminal TL905
Adjustment address 32h
Standard 15V ± 0.05V
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 P-CON 3.1V
Ascertain that the digital voltmeter indicates 3.1V ± 0.1V.
Measuring instrument Digital voltmeter
Measuring terminal TL9718
Adjustment address
Standard 3.1V ± 0.1V
5. Checking of DSP 2.5V
Ascertain that the digital voltmeter indicates 2.5V ± 0.1V.
Measuring instrument Digital voltmeter
Measuring terminal TL916
Adjustment address
Standard 2.5V ± 0.1V
2. Checking of P-CON 4.9V
Ascertain that the digital voltmeter indicates 4.9V ± 0.1V.
POWER CIRCUIT ADJUSTMENT METHOD
Æ Input 7V from DC Jack, and set the power switch to the camera side.
` Don't fail to fix the back light unit before adjusting them.
6. Checking of DSP 1.8V
Ascertain that the digital voltmeter indicates 1.8V ± 0.1V.
Measuring instrument Digital voltmeter
Measuring terminal TL910
Adjustment address
Standard 1.8V ± 0.1V
7. Checking of LCD 13.2V
Ascertain that the digital voltmeter indicates 13.2V ± 0.2V.
Measuring instrument Digital voltmeter
Measuring terminal TL907
Adjustment address
Standard 13.2V ± 0.2V
8. Checking of LCD 7V
Ascertain that the digital voltmeter indicates 7V + 0.4/-0.5V.
Measuring instrument Digital voltmeter
Measuring terminal TL904
Adjustment address
Standard 7V + 0.4/-0.5V
9. 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
10.Checking of CAM -8V
Ascertain that the digital voltmeter indicates -8V ± 0.5V.
Measuring instrument Digital voltmeter
Measuring terminal TL909
Adjustment address
Standard -8V ± 0.5V