JVC KD-LX50R User manual

SERVICE MANUAL
CD RECEIVER
No.49562
May. 2000
COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD.
Printed in Japan
200005(O)
VICTOR COMPANY OF JAPAN, LIMITED
MOBILE ELECTRONICS DIVISION
PERSONAL & MOBILE NETWORK B.U. 10-1,1Chome,Ohwatari-machi,Maebashi-city,Japan
KD-LX50R
(No.49562)
KD-LX50RKD-LX50R
This service manual is printed on 100% recycled paper.
Area Suffix
E ---- Continental Europe
Contents
Safety precaution 1-2
Preventing static electricity 1-3
Instructions 1-4~
Disassembly method 2-1
Maintenance of laser pickup 2-12
Extention cord connectiong method 2-13
Functions of the mechanism under
the service mode 2-16
Flow of functional operation
until TOC read 2-18
Description of major ICs 2-20
Block diagram 2-
Standard schematic diagrams 2-
Printed circuit boards 2-
Parts list 3-1~19
ATT
S
S
M
VCR
KD-LX50R
/I
SOURCE BBE
MODE BAND
DISP
INTLOCALMONOSCM 10789 11 12 RPT RND
OFFSEL
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Front bracket
CD mechanism
control board
Damper bracket
CD mechanism ass’y
FD screw
Feed motor ass’y
FD gear Pickup unit
Preventing static electricity
1.Grounding to prevent damage by 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.
2.About the earth processing for the destruction prevention 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.
2-1 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.
2-2 Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
3. Handling the optical pickup
1. 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.)
2. 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.
4.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. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it
Conductive material
(conductive sheet) or iron plate
(caption)
Anti-static wrist strap
Soldering
Attention when traverse unit is decomposed
1.Solder is put up before the card wire is removed from connector on
the CD substrate as shown in Figure.
(When the wire is removed without putting up solder, the CD pick-up
assembly might destroy.)
2.Please remove solder after connecting the card wire with
when you install picking up in the substrate.
*Please refer to "Disassembly method" in the text for pick-up and how to
detach the substrate.
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Important for laser products
1.CLASS 1 LASER PRODUCT
2.DANGER : Invisible laser radiation when open and inter
lock failed or defeated. Avoid direct exposure to beam.
3.CAUTION : There are no serviceable parts inside the
Laser Unit. Do not disassemble the Laser Unit. Replace
the complete Laser Unit if it malfunctions.
4.CAUTION : The compact disc player uses invisible
laserradiation and is equipped with safety switches
whichprevent emission of radiation when the drawer is
open and the safety interlocks have failed or are de
feated. It is dangerous to defeat the safety switches.
5.CAUTION : If safety switches malfunction, the laser is able
to function.
6.CAUTION : Use of controls, adjustments or performance of
procedures other than those specified herein may result in
hazardous radiation exposure.
VARNING : Osynlig laserstrålning är denna del är öppnad
och spårren är urkopplad. Betrakta ej strålen.
VARO : Avattaessa ja suojalukitus ohitettaessa olet
alttiina näkymättömälle lasersäteilylle.Älä katso
säteeseen.
ADVARSEL : Usynlig laserstråling ved åbning , når
sikkerhedsafbrydere er ude af funktion. Undgå
udsættelse for stråling.
ADVARSEL : Usynlig laserstråling ved åpning,når
sikkerhetsbryteren er avslott. unngå utsettelse
for stråling.
REPRODUCTION AND POSITION OF LABELS
WARNING LABEL
DANGER : Invisibie laser radiation
when open and interlock or
defeated.
AVOID DIRECT EXPOSURE TO
BEAM (e)
VARNING : Osynlig laserstrålning är
denna del är öppnad och spårren är
urkopplad. Betrakta ej strålen. (s)
VARO : Avattaessa ja suojalukitus
ohitettaessa olet alttiina
näkymättömälle lasersäteilylle.Älä
katso säteeseen. (d)
ADVARSEL :Usynlig laserstråling
ved åbning , når
sikkerhedsafbrydere er ude af
funktion. Undgå udsættelse for
stråling. (f)
CLASS 1
LASER PRODUCT
!
CAUTION
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
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Remove the two screws A attaching the bottom
cover to the top chassis on the bottom of the body.
Remove the two screws B attaching the top chassis
on both sides of the body.
Remove the two screws C and the two screws D
attaching the heat sink on the left side of the body.
Remove the two screws E and the screw F on the
back of the body.
Remove the two screws G on the upper side of the
body.
Move the top chassis upward and disconnect the CD
mechanism connector from the main board
connector by pulling it. Remove the top chassis from
the body.
1.
2.
3.
4.
5.
6.
Disassembly method
Removing the top chassis(See Fig.1 to 5)
Fig.1
Fig.2
Fig.3
Fig.4
Fig.5
Bottom cover
A
A
B
Top chassis
Top chassis
Heat sink
C
DB
EF
Top chassis
G
G
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Prior to performing the following procedure, remove
the top chassis.
Disconnect the flexible harness from connector
CN701, the card wire from CN702 on the main board
and the harness from CN503 and CN504
respectively.
Remove the three screws H attaching the main
board assembly to the bottom cover on the upper
side of the body.
Remove the screw I attaching the rear panel and the
bottom cover on the back of the body. Move the
main board in the direction of the arrow and release
the two joints a. (At this point, the main board can be
removed with the rear panel and the rear heat sink.)
Remove the screw J and the two screws K
attaching the rear heat sink on the back of the body.
Remove the three screws L and the screw M
attaching the rear panel. Now, the main board
assembly will be removed.
1.
2.
3.
4.
5.
Removing the main board assembly
(See Fig.6 and 7)
when reassembling, correctly engage
the switch S561 and S562 on the main
board with the part e of the operation
assembly (Refer to Fig.6-2,17 and 18).
ATTENTION:
Fig.6-1
Fig.7
Fig.6-2
H
CN504
CN701
Front panel assembly
CN702
CN503
H
S652
Main board S651
J
I
K
L
M
Rear panel
Rear heat sink
L
Joint a Joint a
e
L
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Prior to performing the following procedure, remove
the top chassis assembly.
Disconnect the flexible harness from connector
CN701 on the main board assembly.
Remove the four screws N attaching the front panel
assembly on both sides of the body. Remove the
front panel toward the front.
1.
2.
Removing the front panel assembly
(See Fig.8,9 and 10)
Prior to performing the following procedure, remove
the top chassis assembly and the front panel
assembly.
Remove the four screws O attaching the front board
on the back of the front panel assembly and release
the eight joints b.
1.
Removing the Front Board (See Fig.11)
Fig.8
Fig.9
Fig.10
Fig.11
CN701
Front panel assembly
CN701
Front panel assembly
N
N
Front panel assembly
O
O
Joints b
Joints b
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Prior to performing the following procedure, remove
the top chassis assembly and the front panel
assembly.
Disconnect the harness from connector CN503 and
CN504 on the main board.
Remove the four screws P and detach the lifter unit
from the bottom cover.
1.
2.
Removing the lifter unit (See Fig.12)
Prior to performing the following procedure, remove
the lifter unit.
Remove the washer attaching the clutch assembly
and detach the clutch assembly from the shaft of the
lifter unit.
Remove the two screws Q attaching the feed motor
(L).
1.
2.
Removing the feed motor (L) (See Fig.13)
Prior to performing the following procedure, remove
the lifter unit.
Remove the washer attaching the clutch assembly
and detach the clutch assembly from the shaft of the
lifter unit.
Remove the two screws R attaching the feed motor
(R).
1.
2.
Removing the feed motor (R) (See Fig.14) Clutch assembly
Fig.12
P
Lifter unit assembly
CN504
CN503
P
Fig.13
Fig.14
Lifter unit assembly
Feed motor (L) assembly
Washer Q
R
Clutch assembly
Washer
Feed motor (R) assembly
Lifter unit assembly
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Prior to performing the following procedure, remove
the top chassis assembly, the front panel assembly
and the lifer unit.
Remove the screws S attaching the right and left
brackets which fix gears on both sides of the
operation assembly.
Remove the springs 5 and 6 from the operation
assembly.
Disconnect the card wire from connector CN702 on
the main board and remove the operation assembly.
1.
2.
3.
Removing the operation assembly
(See Fig.15 to 18)
when reassembling, correctly engage
the switch S561 and S562 on the main
board and the right gear with the part e
of the operation assembly.
ATTENTION: Fig.15
Fig.16
Fig.17Fig.18
S
Spring 6
CN702
Operation assembly
Spring 5
S
Operation assembly e
S652
S651
Operation assembly
e
Operation assembly e
S652 S651
Bracket (R) Bracket (L)
Bracket (R)
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Prior to performing the following procedure, remove
the operation assembly.
Remove the six screws T attaching the button panel
on the operation assembly.
Pull out the operation switch board from inside of the
button panel.
1.
2.
Removing the operation switch board
(See Fig.19 and 20)
Prior to performing the following procedure, remove
the top chassis.
Remove the three screws U and the CD mechanism
assembly from the top chassis.
1.
Removing the CD mechanism assembly
(See Fig.21)
Button panel
Operation switch board
Button panel
CD mechanism assembly
Fig.19
Fig.20
Fig.21
TT
U
UU
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Remove the two screws A on both sides of the body
and detach the top cover upward.
Remove the two screws B and the two screws C
attaching the voice board.
Remove upward the bushing attaching the cord.
Remove the main board from the base chassis while
detaching the pin jack.
Disconnect the sub board from connector CN851 on
the main board.
Disconnect the harness from connector CN852 on
the main board. Then disconnect the cord from the
main board.
1.
2.
3.
4.
Disassembly method
<Voice unit>
Removing the voice recorder
(See Fig.1 to 3)
Fig.1
Fig.2
Fig.3
A
A
Top cover
B
B
Bushing
C
Pin jack
Voice board
Voice board Sub board
CN852
CN851
Cord
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