Sharp VL-MC500H Service Manual page 25

ADJUSTING THE VIDEO I/O CIRCUIT SYSTEM
(Wiring board diagram: Main Side A)
1. PCO D/A-Y adjustment
Test point TL1474 (connected to oscilloscope)
Mode EE mode
Procedure 1) Connect the AVS cable and then connect it to the monitor (TO).
2) Call the adjustment mode (V-ADJ).
3) Set the address to "566", and call the date.
(100% white signal is output.)
4) Vary the date with the FF and REW keys to set the signal appearing at TL1474 to 1.0Vp-p ± 0.05Vp-p.
Examples • During IC705 replacement. • During IC4401 replacement. • During IC1401 replacement.
2. PCO D/A-C adjustment
Test point TL1475
Mode EE mode
Procedure 1) Connect the AVS cable and then connect it to the monitor (TO).
2) Call the adjustment mode (V-ADJ).
3) Set the address to "567", and call the data.
4) Vary the data with the FF and REW keys to set the signal appearing at TL1475 to 0.64Vp-p ± 0.05Vp-p.
Examples • During IC705 replacement. • During IC4401 replacement. • During IC1401 replacement.
J5701
FL5701
R989
R988
C971
TL1474
TL1473 R1477
PCO D/A-Y
TL1470
R1471
TL1472 R1472
J1401
TL1471 R1476
TL1476 R1475
TL1474
R1478
TL1477 R1480
TL1475
R7426
J7401
R7427
TL1475
R7428
PCO D/A-C
R7429
TL900
TL902
TL3342
TL901
TL3341
TL3340
TL3339
TL3350
TL3338 SC900
TL3362
TL3356
TL3351
L907
C953
L912
Q903
R995
R956
TL908
R987 C957
C970 C973
L916
Q907
L917
C974
C933
L923
R996
Q905
R990
Q911 C980
L915 L900
L904
TL913
C930
CP3
IC3405
TL3328
CP2
TL905
Address VCR ADJ 566
Address VCR ADJ 567
25
VL-MC500S/H/E
1.0±0.05
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0.64 0.05
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