Cd Section - Sony XES-Z50 Service Manual

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CD SECTION

Notes:
1. Perform adjustments in the order given.
2. Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwise
indicated.
3. Use the oscilloscope with more than 10 MΩ impedance.
4. Power supply voltage requirement: DC 14.4 V
(more than 5 A)
5. In making adjustment, connect the control unit and changer
unit.
FOCUS BIAS ADJUSTMENT
Condition: This adjustment is performed with the set placed hori-
zontally.
Connection:
DRIVER board
TP (RF)
TP (VC)
Adjustment Procedure:
1. Connect the oscilloscope to TP (RF) and TP (VC) on the
DRIVER board.
2. Put the set into play mode by loading the disc (YEDS-18).
3. Adjust the RV102 on the DRIVER board so that the waveform
TE
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on the oscilloscope (eye pattern) is good.
A good eye pattern means that the diamond shape (≈) in the
center of the oscilloscope can be clearly distinguished.
• RF signal reference waveform (eye pattern)
VOLT/DIV : 200 mV (with the 10: 1 probe in use)
TIME/DIV : 0.5 µsec
Note: When observing the eye pattern, set the oscilloscope to
AC range and raise the vertical sensitivity so that it may
be easily seen.
Connection and Adjustment Location: DRIVER board
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oscilloscope
(AC range)
+
–
+0.3
1.1 Vp-p
–0.2
(See page 50)
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8
TRACKING OFFSET ADJUSTMENT
Condition: This adjustment is performed with the set place hori-
zontally.
Connection:
DRIVER board
TP (TE)
TP (VC)
Adjustment Procedure:
1. Connect the oscilloscope to TP (TE) and TP (VC) on the
DRIVER board.
2. Put the set into play mode by loading the disc (YEDS-18).
3. Press the cursor buttons on the wireless remote commander,
observe the traverse waveform *.
4. Adjust the RV101 on the DRIVER board so that the oscillo-
scope reading is symmetrical in relation to 0 ± 0.05 V.
* Traverse waveform: This is the tracking error waveform appears
when crossing the track.
VOLT/DIV : 1 V (with the 10: 1 probe in use)
TIME/DIV : 2 msec
CENTER : 0 ± 0.05 V
A
0 ±
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C
0.05 V

B


C=1.8 ± 0.3 V
traverse waveform
(100 track jump waveform)
Connection and Adjustment Location: DRIVER board
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– 48 –
2 9 9 4 2 8
oscilloscope
(DC range)
+
–
1 5 0 5 8 2 9 9 4
(See page 50)
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9 9
2 8 9 9