Sharp VL-A10S Service Manual page 26

VL-A10S/H/E
VL-AH30S/H/E
5-3-3. Adjusting the VCR circuit
• Test Points on the Video Circuit Board
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.
1. Adjustment to CAM 15V
Make an adjustment so that the digital voltmeter indicates 15V
± 0.05V.
Measuring instrument
Measuring terminal
Adjustment address
Standard
2. Checking of P-CON 4.9V
Ascertain that the digital voltmeter indicates 4.9V ± 0.1V.
Measuring instrument
Measuring terminal
Adjustment address
Standard
3. Checking of P-CON 3.3V
Ascertain that the digital voltmeter indicates 3.3V ± 0.1V.
Measuring instrument
Measuring terminal
Adjustment address
Standard
4. Checking of P-CON 3.1V
Ascertain that the digital voltmeter indicates 3.1V ± 0.1V.
Measuring instrument
Measuring terminal
Adjustment address
Standard
5. Checking of DSP 2.5V
Ascertain that the digital voltmeter indicates 2.5V ± 0.1V.
Measuring instrument
Measuring terminal
Adjustment address
Standard
Digital voltmeter
TL905
32h
15V ± 0.05V
Digital voltmeter
TL901
4.9V ± 0.1V
Digital voltmeter
TL903
3.3V ± 0.1V
Digital voltmeter
TL9718
3.1V ± 0.1V
Digital voltmeter
TL916
2.5V ± 0.1V
26
5-3-3-1. Adjusting the power
a) POWER CIRCUIT ADJUSTMENT
6. Checking of DSP 1.8V
Ascertain that the digital voltmeter indicates 1.8V ± 0.1V.
Measuring instrument
Measuring terminal
Adjustment address
Standard
7. Checking of LCD 13.2V
Ascertain that the digital voltmeter indicates 13.2V ± 0.2V.
Measuring instrument
Measuring terminal
Adjustment address
Standard
8. Checking of LCD 7V
Ascertain that the digital voltmeter indicates 7V + 0.4/-0.5V.
Measuring instrument
Measuring terminal
Adjustment address
Standard
9. Checking of LCD -15.2V
Ascertain that the digital voltmeter indicates -15.2V ± 1V.
Measuring instrument
Measuring terminal
Adjustment address
Standard
10.Checking of CAM -8V
Ascertain that the digital voltmeter indicates -8V ± 0.5V.
Measuring instrument
Measuring terminal
Adjustment address
Standard
circuit
PROCEDURE
Turn on power
1. Adjust to CAM 15V
2. Check P-CON 4.9V
3. Check P-CON 3.3V
4. Check P-CON 3.1V
5. Check DSP 2.5V
6. Check DSP 1.8V.
7. Check LCD 13.2V
8. Check LCD 7V
9. Check LCD -15.2V
10. Check CAM -8V
Æ Turn off power.
Digital voltmeter
TL910
1.8V ± 0.1V
Digital voltmeter
TL907
13.2V ± 0.2V
Digital voltmeter
TL904
7V + 0.4/-0.5V
Digital voltmeter
TL906
-15.2V ± 1V
Digital voltmeter
TL909
-8V ± 0.5V