Sharp VL-Z700S-T Service Manual page 33

ADJUSTMENT OF LCD CIRCUIT
When making this adjustment, set the backlight switch to "Normal".
(Wiring board diagram: Main Side A)
TL6807(G_OUT)
DAC full scale
1. Setting data
Address 027 08D
Data 94 50
2. Adjustment of DAC full scale (Main PWB)
Measurement point TL6807(G_OUT)
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.
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.
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/
DA_VG + 0.31V ± 10mV
Adjustment rating
Examples · Replacement of IC705, IC4401
3. Adjustment of COM-Bias (with the unit settings complete)
Measurement point LCD panel display surface
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
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
Adjustment rating Standard monitor
Remarks Make adjustment after five minutes or more of aging.
Examples · Replacement of LCD panel · Replacement of IC4401, IC705, IC1800
R747
C704
R1825
C1808
R1824
C1814
R1828
L1803
TL1812
C1815 R1816
C1406
C1813 C1812
L1802
C1407
R1414
R1406 C1416 R1405 C1418
TL1808
TL1809
TL1810
Q1405
C1419
R1421
C1410
C1408 C1409
C1437
TL1431
R1440
IC1431 R1441
L1431
C1432
R1431
R1435 R1434 R1433 C1433
090
30
(The LED shows nothing.)
* The measured voltage is (DA_VG).
52 and 7D)
becomes equivalent to the image on the standard monitor.
R1804
R4402
R1803
R4401
TL7824
TL1451
C7800
R1419
R1402
R1422
L7800
TL6807
TL1452
Q1404
TL6809
R1423
TL7819
C6811
C6800 R6805
TL6803
R6806
D6800
C6802
C6801
IC4401
TL1450
R6807
R1439
R1438
R6809 C6805
C4416
R4489
Q4483 R4485
C4420 R44
C4485
Q4482
C4409 R44
R4486 R4404
C4407 R44
R4471 C4482 R4488 R4487
The same adjusting procedure and connections as
described for the VCR section are used.
Address VCR ADJ 094(G)
Address VCR ADJ 025
Response time: 0.6 sec
Address VCR ADJ 41F, VCR ADJ 421
33
VL-Z700S-T
VL-Z800S-S/E-S/E-T/Z900H-S
VL-Z950S-S/E-A/E-S/E-T/E-W