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4. COM-Bias adjustment
Test point
LCD panel display area
Mode
VCR AV input
Procedure
1) Input white 40% signal into the 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
Remark
Make this adjustment after 5-minute or longer aging.
Examples
• During LCD panel replacement. • During IC705, IC4401, IC4701 replacement.
5. White Balance adjustment
Test point
LCD panel daisplay area
Mode
VCR AV input
Procedure
1) Input white 40% signal into the AV input.
2) Input white 40% signal into the standard monitor, and adjust it until it becomes the same as that screen.
Adjustment
Standard monitor
rating
Remark
Make this adjustment after 5-minute or longer aging.
Examples
• During LCD panel replacement. • During IC705, IC4401, IC4701 replacement.
VIDEO I/O ENG DAC CIRCUIT
(Wiring board diagram: Main Side B)
6. DAC_Y adjustment, DAC_R-Y adjustment, DAC_B-Y adjustment
Test point
TL4403(Y OUT), TL4404(R-Y OUT), TL4405(B-Y OUT), TL7823(GND)
Mode
CAM
Address
VCR ADJ FA(Y), VCR ADJ FB(R-Y), VCR ADJ FC(B-Y)
Procedure
1) Set VCR ADJ 303/304/432/423/424/425/426 to 0C/EF/63/90/EB/80/80.
2) With VCR ADJ FA, adjust the output voltage of TL4403 and the DC voltage value of the digital voltmeter to the
specified adjustment values.
3) Similarly with VCR ADJ FB/FC, adjust the output voltage of TL4404/TL4405 and the DC voltage value of the
digital voltmeter to the specified adjustment values. (Same as Item (2))
4) Return VCR ADJ 303/304/432/423/424/425/426 to the initial value. (Initial value: FF/FF/43/10/29/6E/F0)
Note:When it is changed to the initial value FF/FF/43/10/29/6E/F0, OSD display goes out together with LCD/VF.
Checking the monitor output, adjust it. After adjustment, be sure to return to FF.
0.450V ± 5mV (Y OUT), 0.229V ± 2mV (R-Y OUT), 0.290V ± 2mV (B-Y OUT)
Adjustment
rating
Examples
• During IC705, IC4401, IC4701 replacement.
Address
Address
R780
70
C237
TL5780 R506
TL4440
IC501
TL7800
R509
C507
R526
TL7823
C231
C202
C501
L501
L5789
TL5790 T L5788
TL4405
TL4403
TL4404
C224
R205
TL5786
R2503
TL912
TL7801
R2505
C2501 C2510
C2513
C222
C5702
Q2502
TL5752
C5704
TL5778
C5703
Q2504
R2534
C5701
C239
IC2501
C210
C208
R235
Q2508
C2511
L2502
C2507
C2509
C2503
C204
TL2800
TL2801
TL2802
SC701
SC2501
TL1431 TL239TL245TL244TL243TL242TL241TL235TL240
29
VCR ADJ 33
Response time : 0.6 sec.
VCR ADJ 84(R), VCR ADJ 86(B)
R1934
R1935
C238
IC202
TL4405(B-Y OUT)
DAC_B-Y
TL7823(GND)
DAC_Y,
C226
C227
C228
C240
C235
DAC_R-Y,
DAC_B-Y
TL908
TL4441
TL4404(R-Y OUT)
IC201
C215
DAC_R-Y
C212
C211
C209
R251
R255
R257
TL234
TL4437
TL4438
TL4439
TL4403(Y OUT)
TL233
TL202
DAC_Y
TL201
R258
TL238
TL237
TL236
SC201
TL1420
VL-AX1S/H/E/EW/EX
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