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L-PDl U
ADJUSTMENT
OF VIEW FAR CIRCUIT
(Wiring board diagram: Main Side A)
TL8814(VG)
TL8805(
VF VCO
- TL8826
VF VCO
(Wiring board diagram: Main Side B)
1. VF VCO adjustment
Test point 1 TL8805 (HSY)
Address
VCR ADJ 70
Mode
VCR AV input
Procedure
1) Connect TL8826 to 3V.
2) Connect TL8805 to the frequency
counter, and adjust to the adjustment
standard value at address 78.
3) Open TL8826.
Adjustment
15.734kHz
(NTSC) + IOOHz
rating
Remark
Examples
l
During IC703(E2PROM)
replacement.
l
During IC8800 replacement.
2. VF bright adjustment
Test point
TL8814 (VG)
Address
VCR ADJ 76
Mode
VCR AV input
Procedure
1) The input signal must be 3-step wave.
2) Connect TL8825 (lC8800 pin 53) to GND.
3) Adjust the pedestal interval of waveform
of TL8814 to the specified
level.
Adjustment
7.5kHz * 0.1 Vp-p
rating
CJg.center _ ___-_-.__- _____ -_-_-.-__
_1
7.5 Ik 0.1 vp-p
GND
Remark
Examples
l
During IC703(E2PROM)
replacement.
l
During IC8800 replacement.
1043
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