VL-PD3U
4. COMMON PULSE adiustment
Test point TL1814
Address 88
1 Mode 1 VCR AV input
Procedure
1) Set the data of address 85 at the address 80.
2) Input the white 100% signal as an AV input.
3) Connect the oscilloscope to TL1824, and adjust the pulse width.
Adjustment 6.3Vp-p jz 0.1 Vp-p
rating
1 Examples 1 l During E*PROM (IC801) replacement. l During LCD decoder IC (IC802) replacement.
5. COM-BIAS adjustment
Test point LCD panel daisplay surface
Address 8A
Mode VCR AV input
Procedure 1) Input the white 40% signal as an AV input, and set data of address 85 at the address 80.
2) Set the illuminometer (TOPCON IM-3) on the LCD panel surface (do not allow entry of external light).
(Shut off the 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 set
5) Adjust again if longitudinal stripe appears evidently.
* Or set to the point where the black is settled deepest with the grey scale signal.
Adjustment Minimum
rating
Remark Make this adjustment after 5-minute or longer aging.
Examples l During E*PROM (IC801) replacement. l During LCD panel replacement.
6. White Balance adjustment
/ Test point 1 LCD panel display surface
1 Address 1 82,83
1 Mode
1 VCR AV input
Procedure 1) White fade signal input.
2) Adjust so as to get the same white screen as that of standard monitor.
Adjustment Standard monitor
rating
Remark Make this adjustment after 5-minute or longer aging.
Examples l During E*PROM (lC801) replacement. * During LCD decoder IC (IC802) replacement.
l During LCD panel replacement.
1040
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