JVC KD-S721R Bedienungsanleitung

SERVICE MANUAL

CD RECEIVER

No.49693

Feb. 2002

KD-S723R/KD-S721R

Area Suffix

E -------- Continental Europe

EX ------------ Central Europe

Contents

Safety precaution

Preventing static electricity

Important for laser products

Location of main parts

Disassembly method

1-2

1-3

1-4

1-5

1-6

Adjustment method

Flow of functional

operation unit TOC read

Maintenance of laser pickup

Replacement of laser pickup

Description of major ICs

1-11

1-12

1-14

1-15

COMPACT

DIGITAL AUDIO

KD-S721R

KD-S723R

SCMMODE

RNDRPTMO AM

TP/PTY

SEL CD

DISP 87910 11 12

SCMMODE

RNDRPTMO AM

TP/PTY

SEL CD

DISP 87910 11 12

KD-S723R LCD Color,Button Illumination--- Amber

KD-S721R LCD Color,Button Illumonation--- Green

Difference point

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1-2

KD-S723R/KD-S721R

!Burrs formed during molding may be left over on some parts of the chassis. Therefore,

pay attention to such burrs in the case of preforming repair of this system.

Safety precaution

!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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1-3

KD-S723R/KD-S721R

Conductive material

(conductive sheet) or iron plate

(caption)

Anti-static wrist strap

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.

1.2. 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

1.1.3. 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.

1.1.2. Ground yourself

1. Use an anti-static wrist strap to release any static electricity built up in your body.

1.1.1. Ground the workbench

1. 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.

1.1. Grounding to prevent damage by static electricity

Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players.

Be careful to use proper grounding in the area where repairs are being performed.

FD screw

Feed motor ass’y

FD gear

Pickup unit

Shorting Short circuit land

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KD-S723R/KD-S721R

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 laser-

strålning är denna del

är öppnad och spårren är

urkopplad. Betrakta ej

strålen. (s)

VARO : Avattaessa ja suo-

jalukitus ohitettaessa olet

alttiina näkymättömälle

lasersäteilylle.Älä katso

säteeseen. (d)

ADVARSEL :Usynlig laser-

stråling ved åbning , når

sikkerhedsafbrydere er ude

af funktion. Undgå udsæt

telse 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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1-5

KD-S723R/KD-S721R

Main unit

Location of main parts

Control unit

CD mechanism

Display LED & key control board

Main board

Tuner

pack

Main board Connector to controller

Power IC

ISO connector Antenna jack

Loading motor

Mechanism relay board

Damper

Pickup unit

Damper Feed motor

Spindle motor

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KD-S723R/KD-S721R

Disassembly method

Removing the front panel unit(See Fig.1)

1. Insert a screwdriver to the joints a on the side of the

front chassis and two joints b on the right side, then

detach the front chassis toward the front side.

1. Press the release button and remove the front

panel unit in the direction of the arrow.

Removing the front chassis (See Fig.2)

Removing the heat sink (See Fig.3)

1. Remove the three screws A attaching the heat sink

on the left side of the body, and remove the heat

sink.

Removing the bottom cover (See Fig.4)

Turn the body upside down.

Insert a screwdriver to the two joints c and two

joints d on both sides of the body and the joint e on

the back of the body, then detach the bottom cover

from the body.

Heat sink

Fig.2

Fig.1

Fig. 3

Fig. 4

Bottom cover

Front chassis

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KD-S723R/KD-S721R

Removing the main amplifier board

(See Fig.5 and 6)

Remove the front chassis.

Remove the bottom cover.

Remove the two screws B attaching the main

amplifier board assembly on the bottom of the body.

Remove the three screws C attaching the main

amplifier board assembly on the back of the body.

Disconnect connector CN501 on the main amplifier

board assembly from the CD mechanism assembly.

Removing the CD mechanism assembly

(See Fig.7)

Remove the front chassis.

Remove the bottom cover.

Remove the main amplifier board assembly.

Remove the three screws D attaching the CD

mechanism assembly from the top cover.

Removing the control switch board

(See Fig.8 and 9)

Remove the front chassis.

Remove the four screws E attaching the rear cover

on the back of the front panel unit.

Remove the control switch board from the front

panel unit.

Fig.5

Fig. 6

CD mechanism assembly

Top cover

Fig. 7

Fig. 8

Fig. 9

Control switch board

CN501

Main amplifier board

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KD-S723R/KD-S721R

Unsolder the part aand bon the CD mechanism

control board.

Remove the stator fixing the CD mechanism control

board and the damper bracket (To remove the stator

smoothly, pick up the center part).

Remove the screw Aattaching the CD mechanism

control board.

Remove the CD mechanism control board in the

direction of the arrow while releasing it from the two

damper bracket slots dand the front bracket slot e.

Disconnect the flexible wire from connector on the

pickup unit.

Removing the CD mechanism control

board (See Fig.1 and 2)

Turn the FD gear in the direction of the

arrow to move the entire pickup unit to

the appropriate position where the

flexible wire of the CD mechanism unit

can be disconnected easily.

(Refer to Fig.2)

ATTENTION:

Prior to performing the following procedure, remove

the CD mechanism control board.

Remove the two springs fattaching the CD

mechanism assembly and the front bracket.

Remove the two screws Band the front bracket

while pulling the flame outward.

Remove the belt and the screw Cfrom the loading

motor.

Removing the loading motor

(See Fig.3 to 5)

Fig.2

Fig.3

Fig.4

Shift the lock

Flexible wire

Pickup unit

FD gear

CD mechanism control board

Loading motor Front bracket

Front bracket Pull outward

Pull outward

Flame

Fig.5

Loading motor

Belt

Fig.1

Front bracket CD mechanism

control board

Damper bracket

CD mechanism assembly

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KD-S723R/KD-S721R

Prior to performing the following procedure, remove

the CD mechanism control board and the front

bracket (loading motor).

Remove the three screws Dand the damper

bracket.

Raise the both sides fix arms and move the fix plates

in the direction of the arrow to place the four shafts g

as shown in Fig.8 and 9.

Remove the CD mechanism assembly and the two

springs hattaching the flame.

Remove the two screws Eand both sides rear

damper brackets from the dampers. Detach the CD

mechanism assembly from the left side to the right

side.

Removing the CD mechanism assembly

(See Fig.1, 6 to 9)

The CD mechanism assembly can be

removed if only the rear damper

bracket on the left side is removed.

ATTENTION:

Fig.6

Fig.7

Fig.8

Fig.9

Rear damper bracket

Fix arm (R)

Damper

Damper bracket

CD mechanism

assembly

Flame h

Fig.5

Front bracket CD mechanism

control board

Damper bracket

CD mechanism

assembly

Fix plate (L)

Rear damper bracket Fix arm (L)

Damper

Fix plate(R)

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KD-S723R/KD-S721R

Prior to performing the following procedure, remove

the CD mechanism control board, the front bracket

(loading motor) and the CD mechanism assembly.

Remove the two screws Fand the feed motor

assembly.

Removing the feed motor assembly

(See Fig.10)

Prior to performing the following procedure, remove

the CD mechanism control board, the front bracket

(loading motor), the CD mechanism assembly and

the feed motor assembly.

Detach the FD gear part of the pickup unit upward.

Then remove the pickup unit while pulling out the

part iof the FD screw.

Remove the screw Gattaching the nut push spring

plate and the pickup mount nut from the pickup unit.

Pull out the FD screw.

Removing the pickup unit

(See Fig.10 and 11)

When reattaching the pickup unit,

reattach the part jof the pickup unit,

then the part iof the FD screw.

ATTENTION:

Prior to performing the following procedure, remove

the CD mechanism control board, the front bracket

(loading motor), the CD mechanism assembly and

the feed motor assembly.

Turn up the CD mechanism assembly and remove

the two springs kon both sides of the clamper arms.

Open the clamper arm upward.

Turn the turn table, and remove the two screws H

and the spindle motor.

Removing the spindle motor

(See Fig.12 and 13)

Fig.10

Fig.11

Fig.12

Fig.13

Spindle motor

Pickup unit

Part i

FD screw

Feed motor assembly

FD gear Pickup unit

Part j

Nut push spring plate

Pickup mount nut

Pickup unit

FD screw

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