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ELECTRICAL ADJUSTMENT
A
MAIN C.B
2
L006
3
PVC001
TC004
5
TC002
L004
L008
6
< TUNER SECTION >
1. AM IF Adjustment
L007............................................................450kHz±3.5kHz
2. AM OSC Adjustment
L006 ........................................................... 515kHz (HR)
TC003 ........................................................ 1635kHz (HR)
3. AM Tracking Adjustment
L003 ...................................................................... 600kHz
TC004 .................................................................... 1400kHz
4. FM OSC Adjustment
L005 .................................................................... 87.0MHz
TC001 ................................................................. 109.0MHz
5. FM Tracking Adjustment
L004 .................................................................... 88.0MHz
TC002 ................................................................. 108.0MHz
6. FM IF Adjustment
L008,L009............................................................ 10.7MHz
< TAPE SECTION >
7. Bias Frequency Adjustment
Test point : TP1
L801 .......................................................................... 85kHz
C
CD C.B
3
L003 (BAR ANT)
TC003
TC001
L005
IC001
L009
L007
1
6
4
517kHz (HA)
1750kHz (HA)
IC402
SFR430
IC404
TP3 (RF)
TP1
L801
7
< CD SECTION >
8. Focus Bias Adjustment
Make the focus bias adjustment when replacing and repairing
the optical block.
TP3 (RF)
TP2 (VREF)
1) Connect an oscilloscope to the test points TP3 (RF) and TP2
(VREF).
2) Turn on the power switch.
3) Insert test disc TCD-782 (YEDS-18) and play back the
second composition.
4) Adjust SFR430 so that RF signal of the test point TP3 (RF)
is MAX and CLEAREST.
RF signal waveform
EYE PATTERN
Must be CLEAR and MAX
23
8
TP2 (VREF)
IC401
8
Oscilloscope
(DC range)
+
-
VOLT / DIV: 50mV
TIME / DIV: 0.5µs
MAX
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