ZS-X3CP - Sony Audio Service Manual (repair manual). Page 17

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ZS-X3CP
17
17
– CONTROL BOARD (Conductor Side) –
IC801
TAP
(TEST)
CD SECTION
Perform all CD section check in the test mode.
HOW  TO  THE  SET  INTO  CD  TEST  MODE
1. Press the 
[POWER]
 button to turn the power on.
2. Press the
x
button.
3. Set test mode by momentarily shorting both of TAP (TEST)
on the CONTROL board.
4. Press the
x
button to enter the CD test mode.
5. To release the CD test mode, press the 
[POWER]
 button to
turn the power off.
Checking Location:
TRAVERSE  CHECK
1. Connect an oscilloscope to TP (TE) and TP (VC) on the
CDMP3 board.
2. Insert the disc (YEDS-18). (Part No.: 3-702-101-01) (CD)
3. Press the
u
button three times.
4. Confirm that the center of the oscilloscope waveform is at 0 V.
5. Confirm that the oscilloscope waveform Vp-p value is at 0.8 
±
0.2 V.
6. Insert the disc (TCD-W082L). (Part No.: J-2502-063-2) (CD-
RW)
7. Perform confirmation in the same manner as step 4 and 5.
FOCUS  BIAS  CHECK
1. Connect the oscilloscope to TP (RF) and TP (VC) on the
CDMP3 board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01) (CD)
3. Press the
u
button three times. (LPC ON)
4. Confirm that the oscilloscope waveform is as shown in the
figure below. (eye pattern)
A good eye pattern means that the diamond shape (
◊) in the
center of the waveform can be clearly distinguished.
5. Press the
u
button three times. (LPC OFF)
6. Perform confirmation in the same manner as step 4.
7. Insert the disc (TCD-W082L). (Part No.: J-2502-063-2) (CD-
RW)
8. Perform confirmation in the same manner as step 4 to 6.
• RF signal reference waveform (eye pattern)
Checking Location:
VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 500 ns
CD:
1.1 
±
 0.2 Vp-p (LPC ON)
1.1 
±
 0.3 Vp-p (LPC OFF)
CD-RW:
1.0 
±
 0.2 Vp-p (LPC ON)
0.9 
±
 0.3 Vp-p (LPC OFF)
When observing the eye pattern, set the oscilloscope 
for AC range and raise vertical sensitivity.
VOLT/DIV: 0.2 V (with the 10:1 probe in use)
TIME/DIV :  1 ms
0 V
A
B
Vp-p=A+B
IC701
– CDMP3 BOARD (Conductor Side) –
TP
(RF)
TP
(TE)
TP
(VC)
1
4
CN302
– AUDIO BOARD (Conductor Side) –
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