Sony DNS313F - S2 Sports CD Walkman, Service Manual, Page: 8 / 30

8
D-NS313F
[CD SECTION]
The CD section adjustments are done automatically in this set.
Adjusting Procedure:
1. Perform check in the order given.
2. Use YEDS-18 disc (Part No: 3-702-101-01) unless otherwise
indicated.
3. Power supply voltage requirement :DC4.5 V in DC IN jack.
(J401)
VOLUME button : Minimum
HOLD switch :OFF
Focus bias Check
Condition:
• Hold the set in horizontal state.
Connection:
Procedure:
1. Make a solder bridge to short SL801 (OPEN) on the MAIN
board side A.
2. Connect the oscilloscope to the test point TP604 (RF) and
TP005 (RF-GND(A)) on the MAIN board side B.
3. Set a disc. (YEDS-18)
4. Press the
u
button.
5. Check the oscilloscope waveform is as shown below.
A good eye pattern means that the diamond shape ( ) in the
center of the waveform can be clearly distinguished.
RF Signal reference Waveform (Eye Pattern)
To watch the eye pattern, set the oscilloscope to AC range and
increase the vertical sensitivity of the oscilloscope for easy
watch-ing.
6. Stop revolving of the disc motor by pressing the x
button.
7. SL801 is opened by taking the solder bridge.
RF level
1.2
±
0.2 Vp-p
VOLT/DIV : 500 mV (With the 10 : 1 probe in use)
TIME/DIV : 500n
s
IC801
FB404
C872
C876
R1004
C875 C874
R882
C877
C881
C401
C402
C813
C811
C801
SL801
R408
R401
R402
R875 R879
R820
X802
F402
R829
R823
RB802
Q804 Q803
E
E
SL801(OPEN)
(SIDE A)
MAIN BOARD
IC601
D003
C637
C626
C619
C021
C612
C618 C035
C025
C039
C038
C041
C042
C017
C027
R622
R618
R624
R811 R629
R009
R015
R024
R018
R013
R005
R016
RB903
C006
C051
T002
CF001
CF003
FL001
TP002
(RF(A))
TP604
(RF)
TP005
(RF GND(A))
oscilloscope
(AC range)
+
–
TP604(RF)
TP005(RF-GND(A))
(SIDE A)
MAIN BOARD