VL-PDl U
3. COM-Bias adjustment
Test point
LCD panel display 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.
Response time : 0.6 sec.
Adjustment Minimum
rating Set the point to make the black portion blackest.
Remark
Make this adjustment after 5minute or longer aging.
Examples
l During IC703(E*PROM) replacement.
l During circuit board (Main) replacement.
l During LCD replacement.
4. White Balance adjustment
Test point
LCD panel display 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 Colour luminance meter (TOPCON BM-5) on the LCD panel surface.
(Shut off the external light.)
3) Adiust the VCR ADJ addresses 30 and 31 until it became the same as that of the standard monitor.
Adjustment
Set of the standard W=VF-HL3-136
rating
Set of the limit
R=VF-HLl -048 G=VF-HLI -050 B=VF-HLI -052
Remark
Make this adjustment after 5-minute or longer aging.
Examples
l During IC703(E*PROM) replacement.
l During circuit board (Main) replacement.
0 During LCD replacement.
5. Operation of lamp system safety detection circuit
Test point
LCD panel display area
Mode
VCR AV input
Procedure
I I
1) Set the user bright center.
2) Make sure that the lamp indication appears when the 12 ohm (2W) resistor is put between TL807,
808(BL_PWR) and TL805,806 (BL_GND).
Remark
BL CTL = Nomal
-
Make this adjustment after 5-minute or longer aging.
Examples
l During IC703(E*PROM) replacement.
l During IC8800 replacement..
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