33
VL-Z400S-T/H-T
VL-Z500S-S/H-S/E-T/E-S
3. Adjustment of COM-Bias (with the unit settings complete)
Measurement point
LCD panel display surface
Address
VCR ADJ 025
Mode
VCR AV input
Adjusting method
1) Apply a 40% white signal to the AV input.
2) Set the illuminometer (TOPCON IM-3) on the LCD panel surface. (Cut off outside light.)
3) Minimize the ripple of the output waveform of the illuminometer.
Adjustment rating
Minimum value
Remarks
Make adjustment after five minutes or more of aging.
Examples
· Replacement of LCD panel
4. Adjustment of W/B (with the unit settings complete)
Measurement point
LCD panel display surface
Address
VCR ADJ 41F, VCR ADJ 421
Mode
VCR AV input
Adjusting method
1) Apply a 40% white signal to the AV input.
2) Apply a 40% white signal to the standard monitor. Make adjustment so that the image on the LCD
becomes equivalent to the image on the standard monitor.
Adjustment rating
Standard monitor
Remarks
Make adjustment after five minutes or more of aging.
Examples
· Replacement of LCD panel · Replacement of IC4401, IC705, IC1800
Response time: 0.6 sec
2. Adjustment of DAC full scale (Main PWB)
Measurement point
TL6807(G_OUT)
Address
VCR ADJ 094(G)
Mode
VCR AV input
Adjusting method
1) Set the data values at addresses 41E/086/41C and 410 to FF/80/77 and 00, respectively.
(The LED shows nothing.)
2) Set the data values at addresses 096/411 and 0A8 to 00/80 and 58, respectively.
3) Connect the digital voltmeter to TL6807 (G_OUT) and measure the DC voltage.
* The measured voltage is (DA_VG).
4) Set the data values at addresses 096 and 411 to 80 and 00, respectively.
5) At address 094, adjust the DC voltage to the adjustment rating.
6) Reset the data at addresses 41E/086/096/41C/411/0A8 and 410. (Initial value: 00/C5/28/7F/28/
52 and 7D)
Adjustment rating
DA_VG + 0.31V
±
10mV
Examples
· Replacement of IC705, IC4401
The same adjusting procedure and connections as
described for the VCR section are used.
ADJUSTMENT OF LCD CIRCUIT
When making this adjustment, set the backlight switch to "Normal".
(Wiring board diagram: Main Side A)
1. Setting data
Address
027
08D
090
Data
94
50
30
2
TL1431
SC1800
TL1812
C1438
R1442
TL1810
TL1809
TL1808
C1813
C1815
C1439
L1803
R1814
L1802
Q1431
L1404
C
1402
C1812
R1816
C1441
R1813
R1406
C1408
R1437
IC1431
R1435
L1431
R1817
C1435
C1416
C1814
Q1433
R1434
R1436
C1410
C1407
C1406
C1808
R1405
IC1401
C1434
R1432
R1433
C1431
C1409
C1418
C1432
R1431
R1824
R1825
C1433
Q1432
R1441
R1440
C1437
C1440
R1413
R1401
C1417
R1461
Q1405
C1436
C1411
R1421
C1419
L4404
R1828
C4404
R1403
R1462
R1414
Q1434
Q1403
L4406
R1404
R1424
TL1450
C4424
Q4483
C4483
R6839
R1423
R1422
R1438
R1439
R6836
R6835
TL1452
C1412
R6840
C4481
R246
C220
R4482
C6827
R4489
Q6800
R4481
Q1802
Q1404
R6833
C4422
C6801
TL4424
Q4481
Q1402
TL4400
R219
C219
TL208
TL206
R6832
C4406
R1803
C6829
C
6828
TL212
TL210
TL207
C4482
R1402
R1419
C4401
R4486
C4485
R4485
C4423
R4494
C4428
C4426
R4495
C4417
R4415
C4418
TL1451
R4488
TL4425
TL6807
TL211
TL209
TL205
C4425
R4473
R6837
R6807
R6808
R4401
TL4429
R6805
C4402
C4421
R4409
TL4428
Q4482
R4408
L6800
TL4426
C6800
R6800
C6804
D6800
R4487
C4437
C4409
C4433
R4493
C4419
C4420
TL7804
TL7805
C4410
C
4411
R7827
R7802
R4474
R4404
R6820
R6801
C7802
C4412
R4405
R6819
R6802
R7826
C4436
R4437
R4436
C4431
TL7824
IC4401
R6818
R6803
R7803
C7804
C6805
R4407
C7803
C8805
R7804
R6804
Q4432
R4406
C7801
R4472
R7828
C8800
R4471
R6809
R
7801
R8802
R
8801
TL4470
TL7802
R4475
R6810
R4435
R4477
TL7801
R4476
TL204
C4414
C4430
R4470
C4413
TL
C4432
TL6807(G_OUT)
DAC full scale