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VL-WD250S/H/E
VL-WD450S/H/E
(Wiring board diagram: Main Side B)
TL8845(VR)
VF sub-contrast R/B
VF sub-brightness R/B
TL8846(VG)
VF COM-DC
VF brightness
VF contrast
VFγ1
VF sub-contrast R/B
VF sub-brightness R/B
TL8844(VB)
VF sub-contrast R/B
VF sub-brightness R/B
2. VF VCO adjustment
Test point
TL8849(VF-HD)
Mode
VCR AV input
Procedure
1) Connect TL8800 to GND. (No signal)
2) Connect TL8849 to the frequency counter, and adjust the DC voltage value to the specified adjustment value
with the VCR ADJ E1.
15.625 ± 0.1KHz
Adjustment
rating
Examples
• During IC703 or IC8802 replacement.
3. VF COM-DC adjustment
Test point
TL8847(COM)
Mode
VCR AV input
Procedure
1) Input the signal of a 3-step waveform.
2) Read the DC voltage value of the output of TL8846 with the digital voltmeter. (VG
3) Similarly rad the DC voltage value of the output of TL8847 with the digital voltmeter. (VCOM
4) Adjust the value of (VCOM
-0.15 ± 0.1V
Adjustment
rating
Examples
• During IC703 or IC8802 replacement.
4. VF brightness adjustment
Test point
TL8846(VG)
Mode
VCR AV input
Procedure
1) Input the signal of a 3-step waveform.
2) Set VCR ADJ ED to 00.
3) Adjust the waveform pedestal range of TL8846 to the specified adjustment value.
4) Return VCR ADJ ED to the initial value. (Initial value: 7A)
7.4Vp-p ± 0.1Vp-p
Adjustment
rating
Examples
• During IC703 or IC8802 replacement.
TL8847(COM)
VF COM-DC
TL8849(VF-HD)
VF VCO
C204
C641
L101
C220
R203
R204
R218
R207
R215
R217
R213
R214
- VG
) to the specified adjustment value.
DC
DC
Sig. center
GND
R3470
C639
R3416
C3418
C605
FL3403
R654
R3417
C3416
R670
C3415
R636
R3415
C640
R638
R3404
C3406
R631
C3403
C3401
C625
R3401
R4461
R4466
R7847
D4452
R7858 R4403
R7857
L7801
C7837
L4451
R7856
C4432
C7842
C7815
R7827
C7813
R7860
R4464
R4469
Q4461
R4460
R4468
C4464
R4467
R4451
D4451
C4427
R4473
Q4471
R4477
C4420
Q4472
Q4432
C4435
C218
R4424
R4425 C4436
R4428
C4405
R4486
R4488
R4437
R4442
R4443
R4422
R4418
C4407
R4421
R4426
R4427
R4430
R4499
R4429
R4419
C4409
IC4472
C1405
R4485
R4487
C4408
R4417
C4485
C1413
C1408
Q1434
C1432
R1431
R1432
C1436
R1454
C1404
R1451
Q1432
C1409
C1416
Address
VCR ADJ E1
Address
VCR ADJ F6
Address
VCR ADJ E0
7.4Vp-p
0.1Vp-p
28
C3419
C3417
C3420
C3414
R3410
R3411
R3442
R3406
Q3401 C3465
R3441
C3405
R3496
C3443
Q3406
R3489
C3442
Q3405
C4403
R3499
R7859
TL8800(VF-Y)
VF VCO
C4440
C4402
C4441
R4402
R1725
R1726
Q1701
C1704
)
DC
)
DC
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