Jvc Kd-sx992r User manual

SERVICE MANUAL

CD RECEIVER

No.49719

Mar. 2002

KD-SX992R/KD-SX921R

KD-SX992R/KD-S921R

Area Suffix

E ---- Continental Europe

EX ------- Central Europe

Contents

Safety precaution

Preventing static electricity

Important of laser products

Disassembly method

Adjustment method

1-2

1-3

1-4

1-5

1-20

Flow of functional

operation unit TOC read

Maintenance of laser pickup

Replacement of laser pickup

Description of major ICs

1-21

1-23

1-24

KD-SX921R

KD-SX992R

EQ

TP

PTY

DAB

SOUND

VOL VOL

SOURCE

RF

U

D

ATT

KS-SX921R

EQ

TP

PTY

DAB

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1-2

KD-SX992R/KD-SX921R

!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-SX992R/KD-SX921R

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.

Connector board

DET switch

Pickup Pickup

Short-circuit

Joints b

Short-circuit point

(Soldering)

Flexible wire

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1-4

KD-SX992R/KD-SX921R

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 laser

radiation and is equipped with safety switches which prevent

emission of radiation when the drawer is open and the safety

interlocks have failed or are defeated.

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 : Invisible 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-SX992R/KD-SX921R

Press the release switch and remove the front panel

unit in the direction of the arrow.

1.

Removing the front panel unit (See Fig.1)

Remove the two screws Aattaching the front

chassis.

Remove the two screws Bon each side of the body.

Release the two joints aand the two joints bon the

sides. Release the two joints cat the bottom and

remove the front chassis toward the front.

1.

2.

3.

Removing the front chassis

(See Fig.2 to 4)

Disassembly method

Fig.1

Fig.2

Fig.3-1

Fig.3-2Fig.4

Front panel assembly

Eject button

Joint a

Front chassis assembly

Front chassis

assembly

Heat sink Joint b

Joint b

Front chassis assembly

A

B

Joint c

B

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1-6

KD-SX992R/KD-SX921R

Remove the two screws C and the two screws Don

the left side of the body.

1.

Removing the heat sink (See Fig.5)

Prior to performing the following procedure, remove

the front panel assembly, the front chassis assembly

and the heat sink.

Turn over the body and unjoint the four joints cand

joint dwith the bottom cover and the body using a

screwdriver.

1.

Removing the bottom cover

(See Fig.6 and 7)

When disengaging the joint dusing a

screwdriver, do not damage or break the

main board.

CAUTION:

Fig.5

Fig.6

Fig.7

Heat sink

CD

Joint c

Joint d

Joint c

Joint d

Bottom cover

Rear panel

D

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1-7

KD-SX992R/KD-SX921R

Prior to performing the following procedure, remove

the front panel assembly, the front chassis assembly,

the heat sink and the bottom cover.

Remove the screw E, the three screws F and the

three screws Gattaching the rear panel on the back

of the body. Remove the rear panel.

Remove the two screws Hattaching the main board

on the bottom of the body. Disconnect connector

CN504 on the main board in the direction of the

arrow.

1.

2.

Removing the main board

(See Fig.8 and 9)

Prior to performing the following procedure, remove

the front panel assembly, the front chassis assembly,

the heat sink, the bottom cover and the main board.

Remove the three screws Iattaching the CD

mechanism section on the back of the top chassis.

1.

Removing the CD mechanism section

(See Fig.10)

Fig.8

Fig.9

Fig.10

Rear panel

E

G

F

Main board

H

CN504

CD mechanism section I

I

Top chassis

F

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1-8

KD-SX992R/KD-SX921R

Prior to performing the following procedure, remove

the front panel assembly.

Remove the four screws Jattaching the rear cover

on the back of the front panel assembly.

Unjoint the nine joints ewith the front panel and the

rear cover.

Remove the control switch board on the back of the

front panel.

1.

2.

3.

Removing the control switch board

(See Fig.11 to 13)

Fig.11

Fig.12

Fig.13

J

JJ

J

Rear cover

Joint e

Front panel

Rear cover

Front panel

Control switch board

Joint e

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1-9

KD-SX992R/KD-SX921R

Remove the two screws Aon each side of the body.

Lift the front side of the top cover and move the

cover backward to release the two joints a.

1.

2.

Removing the top cover (See Fig.1 and 2)

Remove the screw Bfixing the connector board.

Solder the short-circuit point on the connector board.

Disconnect the flexible wire from the pickup.

Move the connector board in the direction of the

arrow to release the two joints b.

Unsolder the wire on the connector board if

necessary.

1.

2.

3.

4.

Removing the connector board

(See Fig.3 to 5)

Before disconnecting the flexible wire

from the pickup, solder the short-circuit

point on the pickup. No observance of

this instruction may cause damage of

the pickup.

CAUTION:

Unsolder the short-circuit point after

reassembling.

CAUTION:

Fig.1

Fig.2

Fig.3

Fig.4Fig.5

A

B

Joints a

Top cover

Connector board

DET switch

Pickup

Short-circuit

Joints b

Short-circuit point

(Soldering)

Flexible wire

Connector board

Frame

< CD mechanism section >

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1-10

KD-SX992R/KD-SX921R

Extend the two tabs cof the feed sw. holder and pull

out the switch.

Unsolder the DET switch wire if necessary.

1.

2.

Removing the DET switch

(See Fig.3 and 6)

Prior to performing the following procedure, remove

the top cover and the connector board.

Remove the two suspension springs (L) and (R)

attaching the chassis unit to the frame.

1.

Removing the chassis unit

(See Fig.7 and 8)

The shape of the suspension spring (L)

and (R) are different. Handle them with

care.

CAUTION:

When reassembling, make sure that the

three shafts on the underside of the

chassis unit are inserted to the dampers

certainly.

CAUTION:

Fig.3

Fig.6

Fig.8Fig.7

B

Connector board

DET switch

Pickup

Short-circuit

Joints b

Tab c

Feed sw. holder

Tab c

Suspension spring (L)

Suspension spring (R)

Chassis unit

Frame

Shafts

Shaft

Damper

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1-11

KD-SX992R/KD-SX921R

Prior to performing the following procedure, remove

the top cover, the connector board and the chassis

unit.

Remove the screw Cand move the loading / feed

motor assembly in the direction of the arrow to

remove it from the chassis rivet assembly.

Disconnect the wire from the loading / feed motor

assembly if necessary.

1.

2.

Removing the loading / feed motor

assembly (See Fig.11 and 12)

Prior to performing the following procedure, remove

the top cover.

Remove the clamper arm spring.

Move the clamper assembly in the direction of the

arrow to release the two joints d.

1.

2.

Removing the clamper assembly

(See Fig.9 and 10)

When reassembling, connect the wire

from the loading / feed motor assembly

to the flame as shown in Fig.11.

CAUTION:

Fig.9

Fig.10

Fig.12Fig.11

Clamper arm

spring

Clamper arm spring

Chassis rivet

assembly

Joint d

Joint d Clamper assembly

Clamper assembly

Joint d

Chassis rivet assembly

Loading / feed motor assembly

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1-12

KD-SX992R/KD-SX921R

Reattach the feed rack to the pickup unit using the

screw F.

Reattach the feed sw. holder to the feed rack while

setting the joint tab gto the slot of the feed rack and

setting the part fof the feed rack to the switch of the

feed sw. holder correctly.

As the feed sw. holder is temporarily attached to the

pickup unit, set to the gear of the joint gand to the

bending part of the chassis (joint h) at a time.

1.

2.

3.

Reattach the feed sw. holder using the screw E.

Reattach the shaft to the pickup unit. Reattach the

pu. shaft holder to the shaft using the screw D.

4.

5.

Reattaching the pickup unit

(See Fig.13 to 16)

Prior to performing the following procedure, remove

the top cover, the connector board and the chassis

unit.

Remove the screw Dand pull out the pu. shaft

holder from the shaft.

Remove the screw Eattaching the feed sw. holder.

Move the part eof the pickup unit upward with the

shaft and the feed sw. holder, then release the joint f

of the feed sw. holder in the direction of the arrow.

The joint gof the pickup unit and the feed rack is

released, and the feed sw. holder comes off.

Remove the shaft from the pickup unit.

Remove the screw Fattaching the feed rack to the

pickup unit.

1.

2.

3.

4.

5.

Removing the pickup unit

(See Fig.13 to 17)

Make sure that the part ion the underside

of the feed rack is certainly inserted to the

slot jof the change lock lever.

CAUTION:

Fig.13

Fig.14

Fig.15

Fig.17Fig.16

Feed sw. holder

E

D

E

F

Joint f

Joint g

Joint f

Joint e

Pickup unit

Pu. shaft holder

Shaft

Feed rack

Pickup unit

Feed sw. holder

Pickup unit

Feed rack

Pickup unit

Joint h

Part i

Slot j

Joint g

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1-13

KD-SX992R/KD-SX921R

Prior to performing the following procedure, remove

the top cover, the connector board, the chassis unit,

and the clamper assembly.

Remove the screw H.

Move the top plate assembly in the direction of the

arrow to release the two joints p.

Unsolder the wire marked qif necessary.

1.

2.

3.

Removing the top plate assembly

(See Fig.20)

Prior to performing the following procedure, remove

the top cover, the connector board and the clamper

unit.

Turn the trigger arm in the direction of the arrow to

release the joint kand pull out upward.

1.

Removing the trigger arm

(See Fig.18 and 19)

When reassembling, insert the part land

mof the trigger arm into the part nand

oat the slot of the chassis rivet

assembly respectively and join the joint

kat a time.

CAUTION:

Fig.18

Fig.19

Fig.20

Joint k

Trigger arm

Chassis rivet assembly

Part n

Part l

Part m

Part o

Top plate assembly

Joints p

q

H

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1-14

KD-SX992R/KD-SX921R

Reattach the select lock arm spring to the top plate

and set the shorter end of the select lock arm spring

to the hook uon the top plate.

Set the other longer end of the select lock arm spring

to the boss von the underside of the select lock arm,

and join the select lock arm to the slots (joint t). Turn

the select lock arm as shown in the figure.

Reattach the select arm (L) while setting the part rto

the first peak of the link plate gear, and join the joint

s.

1.

2.

3.

Reassembling the select arm (L) / select

lock arm (See Fig.23 to 25)

Prior to performing the following procedure, remove

the top plate assembly.

Bring up the select arm (L) to release from the link

plate (joint r) and turn in the direction of the arrow to

release the joint s.

Unsolder the wire of the select arm (L) marked qif

necessary.

Turn the select lock arm in the direction of the arrow

to release the two joints t.

The select lock arm spring comes off the select lock

arm at the same time.

1.

2.

3.

Removing the select arm (L) / select lock

arm (See Fig.21 and 22)

When reattaching the select arm (L),

check if the points wand xare correctly

fitted and if each part operates properly.

CAUTION:

Reverse the above removing procedure.

REFERENCE:

Fig.21

Fig.22

Fig.23

Fig.25Fig.24

Top plate

Select arm (L)

Select lock arm

Select lock arm Select lock

arm spring

Select lock arm

Select

lock arm

Joint r

Link plate

Joint z

Joint a'

Select arm (R)

Joint y Joint s q

Link plate spring

Joint b'

Joints t

Hook u

Boss v

Select lock arm spring

Joint t

Link plate Joint r

Point x

Select arm (L)

Select arm (R) Joint a'

Joint b'

Link plate spring

Joint r

Joint s

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1-15

KD-SX992R/KD-SX921R

Reattach the link plate spring.

Reattach the link plate to the link plate spring while

joining them at joint b’.

Reattach the part yof the select arm (R) to the first

peak of the link plate while joining the two joints z

with the slots. Then turn the select arm (R) as shown

in the figure. The top plate is joined to the joint a’.

1.

2.

3.

Reattaching the Select arm (R) / link

plate (See Fig.25 and 26)

Prior to performing the following procedure, remove

the top plate assembly.

Bring up the select arm (R) to release from the link

plate (joint y) and turn as shown in the figure to

release the two joints zand joint a’.

Move the link plate in the direction of the arrow to

release the joint b’. Remove the link plate spring at

the same time.

1.

2.

Removing the select arm (R) / link plate

(See Fig.21 and 22)

When reattaching the select arm (R),

check if the part c’ is correctly fitted and

if each part operates properly.

CAUTION:

Reverse the above removing procedure.

REFERENCE:

Before removing the link plate, remove

the select arm (L).

REFERENCE:

Fig.26

Fig.21

Fig.22

Top plate

Select arm (L)

Select lock arm

Select lock arm Select lock

arm spring

Select lock arm

Joint r

Link plate

Joint z

Joint a'

Select arm (R)

Part y Joint s q

Link plate spring

Joint b'

Joints t

Hook u

Fig.25

Select

lock arm

Point x

Select arm (L)

Select arm (R) Joint a'

Joint b'

Link plate spring

Part y

Joint z

Joint z Part y

w

.

x

i

a

o

y

u

1

6

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c

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m

Q

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1

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Q

TEL 13942296513 QQ 376315150 892498299

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1-16

KD-SX992R/KD-SX921R

Prior to performing the following procedure, remove

the clamper assembly and the top plate assembly.

Push inward the loading roller assembly on the gear

side and detach it upward from the slot of the joint d’

of the lock arm rivet assembly.

Detach the loading roller assembly from the slot of

the joint e’of the lock arm rivet assembly.

The roller guide comes off the gear section of the

loading roller assembly.

Remove the roller guide and the washer from the

shaft of the loading roller assembly.

Remove the screw Iattaching the lock arm rivet

assembly.

Push the shaft at the joint f’of the lock arm rivet

assembly inward to release the lock arm rivet

assembly from the slot of the slide plate. Extend the

lock arm rivet assembly outward and release the

joint g’from the boss of the chassis rivet assembly.

The roller guide springs on both sides come off.

1.

2.

3.

Removing the loading roller assembly

(See Fig.27 to 29)

When reassembling, reattach the left

and right roller guide springs to the lock

arm rivet assembly before reattaching

the lock arm rivet assembly to the

chassis rivet assembly. Make sure to fit

the part h’of the roller guide spring (L)

inside of the roller guide (Refer to

Fig.30).

CAUTION:

Fig.27

Fig.28-1

Fig.28-2

Fig.29Fig.30

Roller guide

Roller guide spring

Roller guide

spring

Roller guide

spring

Roller guide spring

Roller guide

Washer

Loading roller assembly

Joint e'

Joint d'

Lock arm rivet assembly

Chassis rivet assembly

Boss

Slide plate

Joint f'

Part g'

Lock arm rivet assembly

I

Roller guide

Washer

Frame Roller guide spring

Loading roller

Roller shaft assembly

Joint h'

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

5

1

5

0

9

2

8

9

4

2

9

8

T

E

L

1

3

9

4

2

9

6

5

1

3

9

2

8

9

4

2

9

8

0

5

1

5

1

3

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7

3

Q

TEL 13942296513 QQ 376315150 892498299

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1-17

KD-SX992R/KD-SX921R

Prior to performing the following procedure, remove

the top cover, the chassis unit and the top plate

assembly.

Remove the screw Jattaching the loading gear

bracket. The loading gear (6) and (7) come off the

loading gear bracket.

Pull out the loading gear (5).

1.

2.

Removing the loading gear (5), (6) and

(7) (See Fig.31 and 32)

Fig.31

Fig.32

J

Loading gear bracket

Loading gear (6)

Loading gear (5)

Loading gear (6)

Loading gear (5) Loading gear (7)

Loading gear (3)

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

5

1

5

0

9

2

8

9

4

2

9

8

T

E

L

1

3

9

4

2

9

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1

3

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7

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Q

TEL 13942296513 QQ 376315150 892498299

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1-18

KD-SX992R/KD-SX921R

Prior to performing the following procedure, remove

the top cover, the chassis unit, the top plate

assembly and the pickup unit.

Pull out the feed gear.

Move the loading plate assembly in the direction of

the arrow to release the slide plate from the two slots

j’of the chassis rivet assembly.

Detach the loading plate assembly upward from the

chassis rivet assembly while releasing the joint k’.

Remove the slide hook and the loading plate spring

from the loading plate assembly.

Pull out the loading gear (2) and remove the change

lock lever.

Remove the E-washer and the washer attaching the

changer gear (2).

The changer gear (2), the changer gear spring and

the adjusting washer come off.

Remove the loading gear (1).

Move the hang plate rivet assembly in the direction

of the arrow to release from the three shafts of the

chassis rivet assembly upward.

Detach the loading gear plate rivet assembly from

the shaft of the chassis rivet assembly upward while

releasing the joint l’.

Pull out the loading gear (4).

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

Removing the gears (See Fig.33 to 36)

Fig.33

Fig.34

Fig.36Fig.35

Slot j'

Joint k'

Feed gear

Loading plate assembly

Slide plate

Joint l'

Loading gear (4)

Loading gear (2)

Loading gear (4)

Loading gear (2)

Loading gear (1)

Change gear (2)

Loading gear plate

rivet assembly

E-washer

Washer

Shafts

Change plate

rivet assembly

Loading plate assembly

Loading plate spring Loading plate spring

Loading gear plate rivet assembly

Chassis rivet assembly Chassis rivet assembly

Slot j'

Joint k'

Slide plate

Slide hook

Adjusting washer

Change plate

rivet assembly

Change lock lever

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

5

1

5

0

9

2

8

9

4

2

9

8

T

E

L

1

3

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4

2

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6

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1

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2

8

9

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0

5

1

5

1

3

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7

3

Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

1-19

KD-SX992R/KD-SX921R

Prior to performing the following procedure, remove

the top cover, the connector assembly and the

chassis / clamper assembly.

Remove the two screws Kattaching the spindle

motor assembly through the slot of the turn table on

top of the body.

Unsolder the wire on the connector board if

necessary.

1.

2.

Removing the turn table / spindle motor

(See Fig.37 and 38)

Fig.37

Fig.38

K

Turn table

Spindle motor

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

5

1

5

0

9

2

8

9

4

2

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8

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E

L

1

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1

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8

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Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

1-20

KD-SX992R/KD-SX921R

Adjustment method

Test instruments required for adjustment

1. Digital oscilloscope (100MHz)

2. AM Standard signal generator

3. FM Standard signal generator

4. Stereo modulator

5. Electric voltmeter

6. Digital tester

7.Tracking offset meter

8.Test Disc JVC :CTS-1000

9. Extension cable for check

EXTGS004-26P 1

Standard measuring conditions

Power supply voltage : DC14.4V(11V~16V allwance)

Load impedance : 4 (4 to 8 allowance)

Line-out Level / Impedance:

4.0V / 20 k load

How to connect the extension cable for adjusting

Output Impedance:1 k

Dummy load

Exclusive dummy load should be used for AM,and FM. For

FM dummy load,there is a loss of 6dB between SSG output

and antenna input.The loss of 6dB need not be considered

since direct reading of figures are applied in this working

standard.

Standard volume position

Balance and Bass &Treble volume : lndication"0"

Loudness : OFF

BBE : OFF

Frequency Band

FM 87.5MHz ~ 108.0MHz

MW 531kHz ~ 1620 kHz

LW 144kHz ~ 279kHz

KD-SX992R:

KD-SX921R: 2.0V / 20 k load

EXTGS004-26P

Doing such as cardboard puts finishing

between the main body and mechanism.

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

5

1

5

0

9

2

8

9

4

2

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8

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E

L

1

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4

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6

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1

3

9

2

8

9

4

2

9

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0

5

1

5

1

3

6

7

3

Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

JVC KD-SX992R User manual

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