33
VL-Z700S-T
VL-Z800S-S/E-S/E-T/Z900H-S
VL-Z950S-S/E-A/E-S/E-T/E-W
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)
2
TL1431
SC1800
TL1812
C1438
R
1442
TL1810
TL1809
TL1808
C1813
C1815
C1439
R747
L1803
R1814
L1802
Q1431
L1404
C
1402
C1812
R1816
C1441
R1813
R1406
C704
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
C
1417
R1461
Q1405
C1436
C1411
R1421
C1419
L4404
R1828
C4404
R1403
R1462
R1414
Q1434
Q1403
L4406
I
R1404
R1424
TL1450
Q4483
C4483
R1423
R1422
R1438
R1439
TL1452
C6800
R6802
C1412
R6804
C4481
R6807
C6801
C6802
R4472
Q6801
R6803
R4489
R6805
R4471
Q1802
C6804
Q1404
R6809
TL6803
R6817
Q4481
Q1402
C4416
R6806
R6816
R1803
R1804
C4406
D6800
C4482
C6805
C6812
C6811
L6800
R1402
R1419
TL7819
TL6809
C4401
R4486
C4485
R4485
TL1451
TL6807
C4419
R4494
C
6806
R6808
C6810
R4488
R4401
R4402
C4402
R6819
C6815
Q4482
R4487
C6813
C4405
R6820
R6818
C4407
C4409
C4420
C6816
FB4405
C6814
C7802
R4404
L7800
C7800
C4408
C7806
C4421
C7804
C4410
R7828
R7831
TL7824
IC4401
R7830
C4413
R7827
R7826
R44
R44
R44
R7829
C8805
TL6807(G_OUT)
DAC full scale
1. Setting data
Address
027
08D
090
Data
94
50
30