Service manual

30
VL-AX1U
2. PCO D/A-C adjustment
Test point TL1477 Address VCR ADJ 23
Mode EE mode
Procedure 1) Connect TL1420 to GND.
2) Connect the AVS cable and then connect it to the monitor (TO).
3) Call the adjustment mode (V-ADJ).
4) Set the address to "23", and call the data.
5) Vary the data with the FF and REW keys to set the signal appearing at TL1477 to 0.62Vp-p ± 0.05Vp-p.
Examples • During E
2
PROM replacement. • During IC4401 replacement. • During IC1401 replacement.
1. PCO D/A-Y adjustment
Test point TL1475 (connected to oscilloscope) Address VCR ADJ 22
Mode EE mode
Procedure 1) Connect TL1420 to GND.
2) Connect the AVS cable and then connect it to the monitor (TO).
3) Call the adjustment mode (V-ADJ).
4) Set the address to "22", and call the date.
(100% white signal is output.)
5) Vary the date with the FF and REW keys to set the signal appearing at TL1475 to 1.0Vp-p ± 0.05Vp-p.
Examples • During E
2
PROM replacement. • During IC4401 replacement. • During IC1401 replacement.
1.0±0.05
ADJUSTING THE VIDEO I/O CIRCUIT SYSTEM
(Wiring board diagram: Main Side B)
0.62 0.05
TL1475TL1478 TL1481TL1479
TL1431
TL239TL245TL244TL243TL242TL241TL235TL240 TL1420
R257
R244
TL233
TL234
TL4438
R255
TL201
TL202
TL4439
TL4437
R243 R242
R258
C205
TL236
R206
SC201
TL237
R204
TL238
R203 R207 R208
R201
R213
R202
C204
C2509
L2501
R235
R797 R796
SC701
R2506
C2507
R2504 C2508 R2502 R2501 C2506 C2505
TL2802
C2504
TL2801
C2502
C2503
SC2501
TL2800
C2553
Q2503
C2554
C2511
R2518
L2502
R2524
R2537
R2523 R2517
Q2508
Q2501
R2527 R2525
R2530 R2521
R1474
D2501 R2519 R2522
FB1471
R2529
R1477
C2520 R2520
R2528
R1473
C2517 C2518
R2526
R1475
D2504
TL1477
TL1480
R1472
SC1401
R2606
R1471
R2610
R2604
R1476
R2623
R2616
FB1472
R2617
R1470
R2615
R2605
C2552
C2551
R2810
Q2800
R2819
R2820
R2818
R2831
TL1908
TL2803
R2813
TL2804
R2824
R2822
R2823
R2825
C2808
TL2815
R2811
R2814
TL2816
TL2817
TL2812
TL2820
TL2833
SC2801
TL911
TL2834
TL1909
TL1913
TL2825
TL2819
TL2818
TL2814
TL2813
TL2811
TL5758
TL5760
TL783
TL8840TL8842TL8841TL8843
SC5
7
R2833
TL5756
TL5759
TL5761
R2815
C2805
R2582
R2812
R2832
Q2510
D2801
R2583 R2
5
R2588 R2
5
C2807
C2548
R2592
R2581
R2589
R2594 C2542
R2
5
R2593
IC2507
C2546
R2590
R2
5
C2
5
C2544
C
IC2502
R
TL5789
R2534
C2513
R2513
TL5790
Q2507
R2510
TL5788
TL5786
R2533
Q2504
Q2502
R521 R522
TL5778
TL5752
R523
R2532
C2555 C2556 R2538 C2530 C2531
TL4405
TL7801
TL4403
R2503
IC2501
TL4404
R2505
C2501 C2510
L501
TL912
C5701
C5703
C5704
C5702
C208
C210
C239
C222
R205
C224
R
IC201
TL4441
TL908
C209
C211
C212
C215
F
B
R251
L204
C213
TL1477
PCO D/A-C
TL1420
PCO D/A-Y
PCO D/A-C
TL1475
PCO D/A-Y