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PR-8210-
Problem
Cause
Check Point
ТВКС servo not applied
SPDL
lock activated, but no
picture
No color
Defective TRKG mirror
Defective disc sensor circuit
Grating adjustment out of
alignment
| TRKG balance or TRKG gain
adjustment out of alignment
Defective UA5001
Defective CONT
! Defective TANG mirror
Defective TANG mirror drive
¦ circuit
Defective ОМ5003
Check voltage at TP-7 (ТАКС return)
Normally TP8 *1.5V min.
A ТЕКС error of 2.5Vp-p min. wil! normally be
| VSOP adjustment, step 8~10.
Check for presence of video signal at UA5001
(1).
Check release of VIDEO SQ after SPOL lock.
ЏА5001 (2) normally at H ievel.
Turn VR404 (TANG bias) around and check for
voltage changes at TP-12 (TANG return].
Ditto
| Video signal should appear at 0М500312).
H
м-----
EEE
|
т
1
The following waveform should appear at ОМ5003
(3).
TANG error should appear at ТРА.
obtained at TP-5 when ТР-8 is connected to ground.
Sampling pulse should be generated at UM5003(27).
71
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