Sony CDP-S37 - Page 4

SECTION 2
ELECTRICAL ADJUSTMENTS
Perform adjustments is the order given.
Use YEDS-18 (Part No: 3-702-101-01) disc unless other-
wise indicated.
Use the oscilloscpe with more than 10 MOQ impedance.
RF PLL Frequency Adjustment/Lock Frequency Check
Procedure:
frequency counter
main board
TP (PCK)
TP (AG)
<r D >+
o_O -
1. Connect test point TP (ASY) to ground with lead wire.
2. Turn POWER switch on.
3. Connect the frequency counter to test point TP (PCK) and
TP (AG).
4. Adjust RV4 so that the reading on the frequency counter
is 4.3218MHz+30kHz.... (RF PLL frequency adjust-
ment).
5. Remove lead wire connecting TP (ASY) to ground.
6. Put disc (YEDS-18) in and press > button.
7. Confirm that the reading on frequency counter is
4,3218MHz.... (Lock frequency check).
E-F Balance Adjustment
This adjustment should be made when replacing TOP (T-
type Optical Pick-up).
Procedure:
,
oscilloscope
(OC range)
main board C)
TP (TEO) Om———-© +
TP (AG) ee he
Connect test point TP (ADJ) and test point TP (TEI) to
ground with lead wire.
2. Connect oscilloscope to test point TP (TEO) and TP (AG).
3. Turn POWER switch on.
4. Put disc (YEDS-18) in and press > button.
5. Adjust RV1 so that the traverse waveform is symmetrical
above and belew.
6. After adjustment, remove the lead wire connected in
step5. fon S
Easy to see sweep time is lodg.
A A
ov > ov
B B
A=B A=B
(Within 5%} (Within 5%)
Focus Bias Adjustment
This adjustment should be made when replacing TOP
(Ttype Optical Pick-up).
Procedure: oscilloscope
(DC range)
main board
ae oO)
TP (RF) O«———O +
TP (RFG)9«—o =
EN
Connect oscilloscope to test point TP (RF) and TP (RFG).
Turn POWER switch on.
Put disc (YEDS-18) in and press > button.
Adjust RV102 for an optimum waveform eye pattern or so
that the peak is maximum. Optimum eye pattern means
that shape “©” can be clearly distinguished at the center
of the waveform.
RF signal waveform
S/
YY}
WAAAY Wi
YY)
\X WW)
AAA
Ce
NY
A=1.3+0.3 (Vp-p)
Adjustment Location: main board
RF PLL FREQUENCY ADJ/
LOCK FREQUENCY CHECK
—_—_—_—__—_.
PCK, ASY, RV4, AG
j i
/ | :
ADJ, AG, TEI, TEO, RVI
Ss
E-F BALANCE
ADJ
FOCUS BIAS
ADJ
AG, RV2, FEI, FEO
\ \
IC3
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