Service manual
29
VL-WD250U
VL-WD450U
2. PCO D/A-C adjustment
Test point TL5002 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 "23", and call the data.
4) Vary the data with the FF and REW keys to set the signal appearing at TL5002 to 0.64Vp-p ± 0.05Vp-p.
Examples • During E
2
PROM replacement. • During IC4401 replacement. • During IC1401 replacement.
1. VCO free-run adjustment
Test point TL7800(AFC) Address VCR ADJ 32
Mode VCR AV input
Procedure 1) Input the white 100% signal to AV input.
2) Connect the digital voltmeter to TL7800, and adjust DC voltage value to the specified adjustment value with
VCR ADJ 32.
Adjustment 2.00 ± 0.1V
rating
Examples • During E
2
PROM (IC703) replacement. • During VIO ENG (IC4401) replacement.
• During D/A Converter (IC4701) replacement.
2. DAC full-scale adjustment
Test point TL2800(R OUT), TL2801(G OUT), TL2802(B OUT)
Address VCR ADJ 3D(R), VCR ADJ 3E(G), VCR ADJ 3F(B)
Mode VCR AV input
Procedure 1) Set the VCR ADJ 83/93/C0 to 00/77/00. (At this time, LCD can not be displayed.)
2) With the VCR ADJ 3D, adjust the output voltage of TL2800 and the DC voltage value of the digital voltmeter to
the specified adjustment values.
3) Similarly with the VCR ADJ 3E/3F, adjust the output voltage of TL2801/2802 and the DC voltage value of the
digital voltmeter to the specified adjustment values. (Same as Item (2))
4) Return the VCR ADJ 83/93/C0 to the initial value. (Initial value: C5/7F/28)
Adjustment 0.78V ± 10mV
rating
Examples • During E
2
PROM (IC703) replacement. • During VIO ENG (IC4401) replacement.
• During D/A Converter (IC4701) replacement.
ADJUSTING THE LCD CIRCUIT
* To make this adjustment, set the backlight switch to the "NORMAL" position.
(Wiring board diagram: Main Side B)
Adjustment procedure and connecting same as the VCR section.
4
6
3
14
L
3313
L
3312
T
L3348
TL3309
TL3372
TL3373
Q3405
TL3377
TL3311
TL3374
TL3375
TL3302
TL3304
R3494
TL3380
TL3378
TL3306
C3462
R3475
R3474
R3495
TL3379
TL3307
IC3405
R3411R3410C3414
R3412C3466C3420
C3417
C3419
TL3340
FL3402
R3493
R3492
TL3335
C3423
TL3401TL3403
C3454
C3458
C3455
C3460
R3452
C3453
R3450
R3437
C3456
IC3404
R3451
TL1936
R3453
R1801
R1800
TL1800
C1800
C2802
D1800
R1803C1810
Q1800
C2803
R1819
R1802
TL3332
C2804
TL827
TL834
TL1801
TL3331
TL826
TL821
TL831
C1801
R1804
TL801
TL804TL806
SC801
TL810TL813TL814
TL815
TL819
TL824
TL832
TL820
TL818
T
L
TL6
TL816
TL6606
TL6605
TL6607
TL6601
TL817
R5801
C6604
R5800
TL823
L2800
TL812
C2800
R6612
TL811
L2801
C2801
TL809
TL808
C6605
C6611
TL807
R2803R2804
R6619R6616
TL805
R5804
R5803
R2806R2808
TL2800
TL2801
R2805R2807
TL803
R5802
R5805
TL2802
C6612
C6614
TL802
R6624R6620
TL703
C6616R6622
TL702
C6615
R6623
IC2800
R6656
R2800
R2801
R2802
C3473
R3439
R3447
R3438
R3457
L3405
C3459
R3469
R3471
R3444
Q3403
R3468
IC3402
C3479
IC3403
C3452
R3448
R3440
R3443
R3449
C3474
R3436
R3435R3491R3480R3482
R3425
R3463C3430R3490R3481C3444
C3457
C3475
R3462C3429C3471C3434C3431
C3428
R3422
R3424
C3433
C3426
TL3406
R3421
R3423
C3424
C3477
C3481
R3419
C3476
IC3401
R3420
C3421
R3470
C3418
C3416
C3415
C3411
R3414
R3409
R3413
C3413
R3430
C3412
C3409
R3434
C3410
R3407
C3408
R3406
R3442R3404
C3406
Q3401
C3465
R3441
C3403
C3405
C3401
FL3401
R3496
L3401
C3443
R3401
R3489Q3406
C3442
R7847
TL3344
C7816
R7858
R4403
TL3338
R7857
L7
80
1
4
1
5
1
5
4
8
43
L4451
C7837
R7841
R7852
R7843
R7855
R7854
R4454
D4452
TL7800
C7844
C3402
C625
R3402
C3425
L3402
R631
C631
R638
R3415
R3418
C3478
R636
C645
R3417
R654
FL3403
R3416
R635
C3470
C3467
C629
R3478
R3479
R3472
R3454
Q3404
C628
R3473
TL3333
C3436
TL601
L3404
C624
R3428
TL3352
C617
R3429
R3487
C623
R3486R3432
R672
R613
C606
TL602
R3427R3426
R662
R3445
R616
R3488
TH3401
R618
R661
Q605
C3432
R617
R3446
R603C616
L6601Q6604
C6642
R6647
C6644
R6650
C6647
C6620
C6648
R6646
R6648
R6649
R6625
R6626
R6651
Q6602
R6627
R6657
R6658
C6619
C6617
C6618
R6621
R6618
C6613
R6617
IC6601
R6615
R6613
C6610
R6614
C6608
C6609
C6607
C6603
C6602
R6602
C6606
R6607
C6601
R6609
R6606
R6610
R6608
R6605
TL6603
TL6604
R6629
R6628
C6622
C6621
TL5033
TL5035
TL5036
TL5041
TL5037
TL5039
TL5042
C6630
C6628
TL5038
TL5043
C6624
C6623
C6626
R6630
C6629
R6631
C6627
R6632
R6633
C6631
R6635
R6634
R6638
C6637
C6636
R6640
R6639
R6641
R6642
C6638
R6636
Q6603
C6634
R6660
R6661
R6659
R6643
C6639
C6633
R6637
R6644
C6640
C6632
C6641
R621
R6645
TL603
R663
R6654
R6652
R6653
C6646
C6643
Q608
C6645
R609
Q602
R688
C603
R660
R687
R685
R686
R610
TL572
Q604
TL559
TL560
C685
C686
TL570
TL561
R639
R651
R671
C646R656
TL571
C651
C637
TL563
C690
R640
TL554
TL553
C642
R641
IC601
C638
TL557
C639
TL555
C605
TL558
R670
TL562
TL564
TL565
TL568
TL567
TL551
C640
C632
C633
TL566
TL552
C634
TL569
TL556
TL4451
R4466
R4461
C4462
R4462
4
465
4
465
5
3
Q606
L603
C636
TL605
Q601
TL604
C6635
T
L
TL1800
COMMON PULSE
TL7800(AFC)
VCO free-run
TL2800(R OUT)
DAC full-scale
TL2802(B OUT)
DAC full-scale
TL1801(C OUT)
COMMON PULSE
TL2801(G OUT)
DAC full-scale