Sharp VL-A110U Service Manual page 28

VL-A110U/UC
VL-AH130U
6-3-3. 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
Measuring instrument
Measuring terminal
Adjustment address
Standard
3. Checking of P-CON 3.3V
Ascertain that the digital voltmeter indicates 3.3V
Measuring instrument
Measuring terminal
Adjustment address
Standard
4. Checking of P-CON 3.1V
Ascertain that the digital voltmeter indicates 3.1V
Measuring instrument
Measuring terminal
Adjustment address
Standard
5. Checking of DSP 2.5V
Ascertain that the digital voltmeter indicates 2.5V
Measuring instrument
Measuring terminal
Adjustment address
Standard
Digital voltmeter
TL905
32h
15V 0.05V
0.1V.
Digital voltmeter
TL901
4.9V 0.1V
0.1V.
Digital voltmeter
TL903
3.3V 0.1V
0.1V.
Digital voltmeter
TL9718
3.1V 0.1V
0.1V.
Digital voltmeter
TL916
2.5V 0.1V
28
6-3-3-1. Adjusting the power
a) POWER CIRCUIT ADJUSTMENT
6. Checking of DSP 1.8V
Ascertain that the digital voltmeter indicates 1.8V
Measuring instrument
Measuring terminal
Adjustment address
Standard
7. Checking of LCD 13.2V
Ascertain that the digital voltmeter indicates 13.2V
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
Measuring instrument
Measuring terminal
Adjustment address
Standard
10.Checking of CAM -8V
Ascertain that the digital voltmeter indicates -8V
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.
0.1V.
Digital voltmeter
TL910
1.8V 0.1V
0.2V.
Digital voltmeter
TL907
13.2V 0.2V
Digital voltmeter
TL904
7V + 0.4/-0.5V
Digital voltmeter
TL906
-15.2V 1V
0.5V.
Digital voltmeter
TL909
-8V 0.5V
1V.