(No.MB049)1-5
1.6 Preventing static electricity
Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser
diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.
1.6.1 Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players.
Be careful to use proper grounding in the area where repairs are being performed.
(1) Ground the workbench
Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the
traverse unit (optical pickup) on it.
(2) Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
(3) Handling the optical pickup
• In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical
pickup are shorted. After replacement, return the shorted parts to their original condition.
(Refer to the text.)
• Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily
destroy the laser diode.
1.7 Handling the traverse unit (optical pickup)
(1) Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.
(2) Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the
replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long
a time when attaching it to the connector.
(3) Handle the flexible cable carefully as it may break when subjected to strong force.
(4) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
1.8 Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the CD pickup unit.
• Apply solder to the short land sections before the flexible wire is disconnected from the connector CN101 on the CD servo board.
(If the flexible wire is disconnected without applying solder, the CD pickup may be destroyed by static electricity.)
• In the assembly, be sure to remove solder from the short land sections after connecting the flexible wire.
1M
Conductive material
(conductive sheet) or iron palate
(caption)
Anti-static wrist strap
D SERVO board
CD SERVO board
Soldering pa
CN601
CN60
C601
C602
C603
C604
C605
C606
C607
C610
C611
C612
C613
C614
C615
C616
C617
C619
C620
C621
C622
C623
C624
C631
C632
C633
C641
C642
C643
B619
C651
C652
C653
C654
C655
C656
C657
C658
C661
C663
C664
C665
C667
C668
C669
C670
C671
C672
C673
C676
C677
C679
C680
C691
C692
C693
C694
C695
C696
C699
C801
C802
C811
C812
C813
C814
C815
C821
C822
C823
C824
C831
C832
C833
CN601
CN651
CN652
CN801
D831
R648
IC652
IC801
IC802
L831
Q631
Q801
R601
R602
R603
R604
R605
R606
R610
R611
R612
R613
R617
R618
R619
R620
R621
R631
R632
R634
R635
R636
R641
R642
R643
R647
R651
R652
R653
R654
R655
R656
R657
R658
R659
R661
R662
R663
R664
R665
R666
R667
R668
R669
R670
R682
R683
R685
R691
R692
R695
R696
R701
R702
R703
R704
R705
R706
R707
R708
R709
R710
R801
R802
R803
R804
R805
R806
R807
R808
R809
R812
R821
R822
R823
R824
R831
W605
CN606
X651
B604
B616
B614
R813
C816
B613
B615
B610
B612
B617
B618
IC601
R607
B601
B603
B602
B611
B609
B608
B607
B606
B605
D601
D602
R681
C681
R684
MUTE
FLAG
CDDG
BLKCK
/REST
MLD
MDATA
MCLK
CDDG
SUBQ
SQCK
/RST
STAT
FM+
REST
SM-
SM+
D.GND
FM-
1
1
1
1
1
BE
BE
C
31
6
ARF
A.GND
F-
T-
T+
F+
GND
VR
LD
MD
T2
K
F1
NC
T1
SR
F2
115
T02
SCD
SCD
CDDG
13
LM+
OPSW
GND
CLSW
LM-
M.GND
SW10
SW10
CLOSE
OPEN
OPSW
CLSE
CD+B
CD+B
CDL
A.GND
A.GND
CDR
51
116
1
21
41
61
17
16
32
12
24
13
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