Service manual

VL-FD1U

VL-SD20U

3. COM-Amplitude adjustment

Test point TL1801 Address VCR ADJ 29

Mode CAM

Procedure 1) Set TL1801 to GND.

2) Adjust the output voltage of TL1801 with the address 29 and the DC voltage with a digital voltmeter to the

adjustment standard value.

Adjustment 6.55V ± 50mV

rating

Examples

Response time : 0.6 sec.

4. COM-Bias adjustment

Test point LCD panel daisplay area Address VCR ADJ 33

Mode VCR AV input Input Signal 40% White (or gray scale) signal

Procedure 1) Input white 40% signal as AV input.

2) Set the illuminometer (TOPCON IM-3) on the LCD panel surface.

(Shut off the external light.)

3) Minimize the ripple of output waveform of illuminometer.

Adjustment Minimum

rating Set the point to make the black portion blackest.

Examples • During IC7702 (FLASH MEMORY) replacement. • During circuit board (MAIN) replacement.

• During LCD panel replacement.

5. White Balance adjustment

Test point LCD panel daisplay area Address VCR ADJ 30 (R), VCR ADJ 31 (B)

Mode VCR AV input

Procedure 1) Feed 40% white signal to the AV input jacks and the standard monitor.

2) Set the Color luminance meter (TOPCON BM-5) on the LCD panel surface.

(Shut off the external light.)

3) Adjust the VCR ADJ addresses 30 and 31 until it became the same as that of the standard monitor.

Adjustment Set of the atandard W=VF-HL3-136

rating Set of the limit R=VF-HL1-048 G=VF-HL1-050 B=VF-HL1-052

Remark Make this adjustment after 5-minute or longer aging.

Examples • During IC7702 (FLASH MEMORY) replacement. • During circuit board (MAIN) replacement.

• During LCD panel replacement.

ADJUSTING THE TOUCH PANEL CIRCUIT

1. Touch panel position detection adjustment

Test point LCD panel display area Mode VCR AV input

Procedure 1) Enter the adjustment of touch panel adjustment mode.

2) Press successively the two-point OSD indication which appears on the LCD indication surface.

Note: To set the touch panel adjustment mode, press “CONTINUE” → “TEST” on the remote control for

adjustment, adjust the address to “0E” with FF/REW, and press the PB key.

Examples

Successively press these

two points.