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3. COMMON PULSE adjustment
Test point
TL1801(C OUT)
Mode
VCR AV input
Procedure
1) Connect TL1800 to GND.
2) With VCR ADJ 29, adjust the output voltage of TL1801 and the DC voltage value of the digital voltmeter to the
specified adjustment values.
7.05V ± 50mV
Adjustment
rating
2
Examples
• During E
PROM (IC703) replacement.
4. COM-BIAS adjustment
Test point
LCD panel display surface
Mode
VCR AV input
Procedure
1) Input the white 100% signal to AV input.
2) Set up the illuminance meter (TOPCON IM-3) on the LCD panel surface. (The outside light must not enter.)
3)Minimize the ripple of the output waveform of the illuminance meter.
Adjustment
Minimum
rating
Remark
Make this adjustment after 5-minute or longer aging.
Examples
• During LCD monitor replacement. LCD Panel • During IC4701, IC703 replacement.
5. White Balance adjustment
Test point
LCD panel display surface
Mode
VCR AV input
Procedure
1) Input the white 40% signal to AV input.
2) Input the white 40% signal to the standard monitor, and adjust it to become equal to that of the screen.
Adjustment
Standard monitor
rating
Remark
Make this adjustment after 5-minute or longer aging.
Examples
• During LCD monitor replacement. LCD Panel • During IC4401, IC4701, IC703 replacement.
VIDEO I/O ENG DAC CIRCUIT
1. 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 303/304/432/423/424/425/526 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.
Note:When it is changed to the initial value FF/FF/C3/10/29/6E/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 IC4401, IC4701, IC703 replacement.
• During D/A Converter (IC4701) replacement.
C7837
L4451
C4432
C7842
R4464
R4469
Q4461
R4460
R4468
C4464
R4451
R4467
D4451
C4427
C641
R4473
Q4471
R4477
C4420
Q4472
Q4432
C4435
C218
R4424
R4425 C4436
R4428
C4405
R4486
R4488
R4437
R4443
R4422
C4407
R4426
R4499
C1405
R4485
R4487
C4485
C1413
C1408
Q1434
C1432
R1431
R1432
C1436
R1454
C1404
Q1432
C1409
Address
VCR ADJ 29(C)
Address
VCR ADJ 33
Response time
Address
VCR ADJ 84(R), VCR ADJ 86(B)
(Wiring board diagram: Main Side B)
R7857
L7801
C4403
R7856
R3499
C7815
R7827
C7813
TL4405(B-Y OUT)
R7860
R7859
DAC_B-Y
TL4403(Y OUT)
DAC_Y
TL7823(GND)
DAC_Y, DAC_R-Y, DAC_B-Y
C4440
R4442
C4402
C4441
R4418
R4402
R1725
R4421
R4427
R4430
R1726
R4429
R4419
C4409
IC4472
C4408
R4417
Q1701
R1451
C1704
C1416
27
F
0.6sec
TL4404(R-Y OUT)
DAC_R-Y
VL-WD250S/H/E
VL-WD450S/H/E
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