Sharp VL-A111UL Service Manual - Page 28

VL-A111U/AH131U VL-AH151U/AH161U 6-6-3. VCR circuit adjustment * Before adjusting the VCR circuit, make sure that the fixed value in 6-3-2 is written in E2PROM. · Test points on the video circuit board. 6-6-3-1. Supply voltage adjustment/check POWER CIRCUIT ADJUSTMENT 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 2.65V 6. Check DSP 1.85V 7. Check LCD 13.2V 8. Check LCD 7V 9. Check LCD -15.2V 10. Check CAM -8V Æ Turn off power. POWER CIRCUIT ADJUSTMENT METHOD Æ Input 7V from DC Jack, and set the power switch to the camera side. ` Do not 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 Digital voltmeter Measuring terminal TL905 Adjustment address 32h(VTR ADJ) Standard 15V ± 0.05V 2. Checking of P-CON 4.9V Ascertain 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 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 6. Checking of DSP 1.85V Ascertain that the digital voltmeter indicates 1.85V ± 0.15V. Measuring instrument Digital voltmeter Measuring terminal TL910 Adjustment address Standard 1.85V ± 0.15V 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 5. Checking of DSP 2.65V Ascertain that the digital voltmeter indicates 2.65V ± 0.25V. Measuring instrument Digital voltmeter 10.Checking of CAM -8V Ascertain that the digital voltmeter indicates -8V ± 0.5V. Measuring instrument Digital voltmeter Measuring terminal TL916 Measuring terminal TL909 Adjustment address Adjustment address Standard 2.65V ± 0.25V Standard -8V ± 0.5V 28