Sony CD Walkman D-EG7, Руководство по обслуживанию

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Focus Bias Check
Condition :
• Hold the set in horizontal state.
Procedure :
[MAIN BOARD] (Side B)
1. Set the equipment to service mode stop state (See page 7).
2. Connect the oscilloscope between TP513 (RFO) and TP533 (VC)
on the MAIN board.
3. Move the optical pick-up by Pressing the
+
and
=
keys.
4 Put the disc (YEDS-18).
5. Press the
^
key.
From focus searching, focus is turned ON while entering
CLV drawing-in mode. Tracking and sled are turned OFF.
6. Press the PLAY MODE key. (Both tracking and sled are turned
ON).
7. Check the oscilloscope waveform is as shown below.
A good eye pattern means that the diamond shape (
◊
) in the cen-
ter 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.
8. Stop removing of the motor by pressing the
p
key.
9. After the completion of adjustment, reset service mode.
(See page 7 )
SECTION 5
ADJUSTMENTS
( )
CD SECTION
Precautions for Adjustment
1. Before beginning adjustment, set the equipment to service mode.
After the completion of adjustment, be sure to reset the service
mode.
For more information, see “Service Mode (service program)”
on page 7.
2. Perform adjustments in the order given.
3. Use the disc (YEDS-18. Part No. 3-702-101-01) unless other-
wise indicated.
4. Power supply voltage requirement : DC 4.5 V
HOLD switch : OFF
VOLUME : Minimum
SOUND switch : NORM
AVLS switch
: OFF
Before Beginning Adjustment
Set the equipment to service mode (See page 7) and check the fol-
lowing.
If there in an error, repair the equipment.
• Checking of the sled motor
1. Open the upper panel.
2. Press the
+
and
=
keys and check that the optical pick-up
can move smoothly without sluggishness or abnormal noise in
innermost periphery
n outermost periphery n innermost pe-
riphery.
+
: The optical pick-up moves outwardly
=
: The optical pick-up moves inwardly
• Checking of focus searching
1. Open the upper panel.
2. Press the
^
key. (Focus searching operation is activated con-
tinuously).
3. Check the object lens of the optical pick-up for smooth up/down
motion without sluggishness or abnormal noise.
4. Press the
p
key.
Check that focus searching operation is deactivated. If not, again
press the
p
key slightly longer.
RF level
0.8 – 1.2 Vp-p
VOLT/DIV : 200 mV
TIME/DIV : 0.5 m
s
1
54
55 60 65 70 72
C549
TP513(RFO)
R501
TP534
TP505
C599
R502
R503
TP502
R509
R510
Q501
L502
C516
R506
R507
R505
TP503
TP504
TP506
TP547
TP509
TP510
TP511
TP508
TP517
TP518
TP519
C879
R809
TP525
TP514
(TEO)
TP521
R512 C501
7
TP532
TP522
TP533(VC)
TP555
TP507
TP512
TP523
LCD801
TP816
(TEST)
1 5 10 11
TP513 (RFO)
TP533 (VC)
2 k
Ω
oscilloscope
(AC range)