Service manual

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VL-A111U/AH131U

VL-AH151U/AH161U

5. VCO adjustment

Measuring point TL3802

Address(VTR ADJ) 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 ± 100Hz

Remarks ———————

Measuring point TL1801

Address(VTR ADJ) 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 ± 50mV

Remarks ———————

7. COMMON PULSE adjustment

Measuring point TL3802

Address(VTR ADJ) 03B

Mode VCR

Adjusting method 1) Connect the oscilloscope to TL3802, and adjust the pulse width.

Adjustment standard 3 type: 2.8µsec ±0.15µsec (A111U/AH131U/AH151U), 3.5 type: 3.7µsec ±0.15µsec (AH161U)

Remarks ———————

6. H-position adjustment

Measuring point LCD panel display surface

Address(VTR ADJ) 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.

8. COM-BIAS adjustment

Measuring point LCD panel display surface

Address(VTR ADJ) 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 items 3 and 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.

9. W/B adjustment