Sharp VL-A110U Service Manual page 31

5. VCO adjustment
Measuring point TL3802
Address 03E
Mode VCR
Adjusting method 1) Connect TL3803 to GND.
2) Connect the frequency counter to TL3802, and adjust the frequency.
Adjustment standard 15.734kHz
Remarks ———————
6. H-position adjustment
Measuring point TL3802
Address 03B
Mode VCR
Adjusting method 1) Connect the oscilloscope to TL3802, and adjust the pulse width.
Adjustment standard 2.8 sec 0.15 sec
Remarks ———————
7. COMMON PULSE adjustment
Measuring point TL1801
Address 037
Mode VCR
Adjusting method 1) Set the data of address 0A5 at the address 80.
2) Connect TL1800 to GND.
3) Connect the Digital voltmeter to TL1801, and adjust the DC Volt.
Adjustment standard 6.85V
Remarks ———————
8. COM-BIAS adjustment
Measuring point LCD panel display surface
Address 03C
Mode VCR
Adjusting method 1) Set data of address 0A5 at the address 80 and address 082 at the address A9.
2) Set the illuminometer (TOPCON IM-3) on the LCD panel surface (do not allow entry of external light).
3) Connect the illuminometer to the oscilloscope.
4) Make an adjustment so as to minimize the ripple of output waveform.
Response time: 0.6 sec
5) Adjust again if longitudinal stripe appears evidently.
6) Set data of address 082 at the address 40. (Restore)
* Or set to the point where the black is settled deepest with the grey scale signal.
Adjustment standard Minimum
Remarks Make an adjustment after aging for 5 minutes or more.
9. W/B adjustment
Measuring point LCD panel display surface
Address 090, 092
Mode VCR
Adjusting method 1) Set data of address 0A5 at the address 80, and address 082 at the address A9.
2) Adjust so as to get the same white screen as that of standard monitor. (Adjust again, visually checking as
stated in item 3. 4.)
3) Set data of address 082 at the address 40. (Restore)
Adjustment standard Standard monitor
Remarks Make an adjustment after aging for 5 minutes or more.
100Hz
50mV
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VL-A110U/UC
VL-AH130U
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