JVC UX-P30 Series Service Manual page 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.
(caption)
Anti-static wrist strap
(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.
CD SERVO board
B618
CN606
LM-
CLSW
GND
OPSW
LM+
M.GND
SW10
SW10
CLOSE
OPEN
OPSW
CLSE
CD+B
CD+B
CDL
A.GND
A.GND
CDR
MUTE
FLAG
SCD
SCD
CDDG
CDDG
BLKCK
/REST
MLD
MDATA
MCLK
CDDG
SUBQ
SQCK
/RST
STAT
1M
CN601
R710 R708
D831
1
IC802
C669
C679
C832
R709
C833
D601 IC652
B604
C694
R707
R667
R684
R681
61
A.GND
41 ARF
1
C655
21
C610 1
C617 C624
R683
16
C672 C643
C671 E B
C670
C
IC601
B619 17 32
CN801
C813 C633
FM-
D.GND
SM+
C824
SM-
REST
FM+
R821
12 C812
1
B609
13 24
B608
R636
T02
1 1 5
CN601
Conductive material
(conductive sheet) or iron palate
CD SERVO board
CN601
Soldering part
(No.MB049)1-5