Sony CD Walkman D-EG7, Руководство по обслуживанию

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The laser diode in the optical pick-up block may suffer electrostatic
breakdown because of the potential difference generated by the charged
electrostatic load, etc. on clothing and the human body. During repair,
pay attention to electrostatic breakdown and also use the procedure in
the printed matter which is included in the repair parts.
The flexible board is easily damaged and should be handled with care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused on the
disc reflective surface by the objective lens in the optical pick-up block.
Therefore, when checking the laser diode emission, observe from more
than 30cm away from the objective lens.
Before Replacing the Optical pick-up Block
Please be sure to check thoroughly the parameters as per the “Optical
pick-up Block Checking Procedure” (Part No. : 9-960-027-11) issued
separately before replacing the optical Pick-up block.
Note and specifications required to check are given below.
• FOK output : IC501
!™
pin
When checking FOK, remove the lead wire to disc motor.
• S curve P-to-P value : 0.9 – 1.5Vp-p IC501
#¡
pin. (Connect pin
!™
of IC501 (TP880) and
3
of IC501 (GND) with a jumper wire).
When checking S curve P-to-P value, remove the lead wire to disc
motor.
• Adjusted part for focus gain adjustment : RV503
• RF signal P-to-P value : 0.8 – 1.2Vp-p
• Traverse signal P-to-P value : 1.0 – 2.4Vp-p
• The repairing grating holder is impossible.
• Adjusted part for tracking gain adjustment : RV502
SECTION 1
SERVICING NOTES
Laser Diode Checking Methods
During normal operation of the equipment, emission of the laser diode
is prohibited unless the upper panel is closed while turning ON the S801
(push switch type).
The following two checking methods for the laser diode are operable.
Method-1 (In the service mode or normal operation) :
Emission of the laser diode is visually checked.
1. Open the upper lid.
2. Push the S801 as shown in Fig. 1-1 .
3. Check the object lens for confirming normal emission of the laser
diode. If not emitting, there is a trouble in the automatic power
control circuit or the optical pick-up. During normal operation, the
laser diode is turned ON about 2.5 seconds for focus searching.
Fig. 1-1 Method to push S801
Method-2 (In the service mode or normal operation) :
Check the value of current flowing in the laser diode.
1. Remove the upper panel.
2. Read the current printed on the rear side of the optical pick-up.
(Print on the rear side of the optical pick-up)
3. Connect a digital voltmeter as shown in Fig. 1-2
4. Press the
^
key.
Fig. 1-2 Digital Voltmeter Connecting Location
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR
BASE UNIT
A C 2 2 1 1 3 9 7
year
version
month
A : less than 48 mA
current value
date
line No.
shift No.
[MAIN BOARD] (Side B)
1
5
10
15
18
19 25
30 36
37
40
45
50
54
55 60 65 70 72
C549
TP534
TP505
TP502
R509
C806
R510
Q501
L502
C516
R506
R507
R505
TP503
TP506
TP547
TP511
TP508
TP518
C879
R809
P822
80
R806
7
TP532
TP501
TP555
TP821
TP507
TP512
TP523
IC801
X801
TP816
(TEST)
TP506
digital voltmeter
TP547
S801
5. Calculate the current value by the reading of the digital voltmeter.
Reading of the tester (V) ÷ 4.7 (
Ω
) = current value (A)
(Example) Reading of the digital voltmeter of 0.2256 V :
0.2256 V ÷ 4.7
Ω
= 0.048 (A) = 48 mA
6. Check that the current value is within the following range.
+5
• Current value of the label
-11
mA(25
°
C)
Variation by temperature : 0.4mA /
°
C
Current increases with temperature increased.
Current decreases with temperature decreased.
If the current is more than the range above, there is a trouble in the
automatic power control circuit or the laser diode is in deterioration.
If less than the range, a trouble exists in the automatic power control
circuit or the optical pick-up.