Jvc Kd-sx985, kd-sx885 User manual

SERVICE MANUAL

CD RECEIVER

No.49731

Jun. 2002

KD-SX985

Area Suffix

U Other Areas

Contents

Safety precaution

Preventing static electricity

Disassembly method

Adjustment method

1-2

1-3

1-4

1-19

Flow of functional

operation unit TOC read

Maintenance of laser pickup

Replacement of laser pickup

Description of major ICs

1-20

1-22

1-23~44

SOUND

VOL VOL

SOURCE

RF

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1-2

!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

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

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.

(caption)

Anti-static wrist strap

Conductive material

(conductive sheet) or iron plate

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1-4

Press the release switch and remove the front panel

unit in the direction of the arrow.

1.

Disassembly method

Removing the front panel unit

(See Fig.1)

Turn the body upside down.

Insert a screwdriver to the two joints a and two joints

bon both sides of the body and the joint con the

back of the body, then detach the bottom cover from

the body.

1.

2.

Removing the bottom cover

(See Fig.2,3)

When disengaging the joint cusing a

screwdriver, do not damage or break the

board.

CAUTION:

Prior to performing the following procedure, remove

the bottom cover.

Remove the two screws Aattaching the front

chassis.

Remove the two screws B on each side of the body.

Release the two joints dand the two joints eon the

sides. remove the front chassis toward the front.

1.

2.

3.

Removing the front chassis (See Fig.4,5)

Fig.4

Fig.1

Fig. 5

Front chassis

A

B

Front chassis

Joint d

Joint d Joint e

Joint e

Fig. 2

Bottom cover

Joint a

Joint b

Joint c

Fig. 3

Bottom cover

Joint a

Joint b

Joint c

Front panel unit

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1-5

Prior to performing the following procedure, remove

the front chassis, the heat sink and bottom cover.

Remove the eight screws D attaching the rear panel

and one screw E attaching the pine jack on the back

of the body.

1.

Removing the rear panel (See Fig.7 )

Prior to performing the following procedure, remove

the front chassis, the heat sink, bottom cover and the

rear panel.

Remove the two screws Fattaching the main

amplifier board assembly on the top cover.

Disconnect connector CN101 on the main amplifier

board assembly from the cassette mechanism

assembly.

1.

2.

Removing the main amplifier board assembly

(See Fig.8)

Remove the four screws C attaching the heat sink

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

sink.

1.

Removing the heat sink (See Fig.6)

Fig. 7

Fig. 8

Main board assembly

DD

D

D D

E

Rear panel

CN101

FF

Heat sink

Fig. 6

CC

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1-6

Prior to performing the following procedure, remove

the top cover.

Disconnect the wire from connector CN601on the

MP3 board.

Remove the five screws Gand the MP3 board,

releasing the joint fand g.

1.

2.

Removing the MP3 board

(See Fig.9)

Prior to performing the following procedure, remove

the front chassis, the heat sink, bottom cover and the

main amplifier board assembly.

Remove the three screws H attaching the cassette

mechanism assembly from the top cover.

1.

Removing the CD mechanism assembly

(See Fig.10)

Fig.9

G

fg

CN601

G

CD mechanism assembly

H

Top cover

Fig. 10

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1-7

Removing the (LCD & key) control switch

board (See Fig.11 ~ 13)

Prior to performing the following procedure, remove

the front panel assembly.

Remove the four screws Iattaching the rear cover

on the back of the front panel assembly.

Unjoint the nine joints hwith the front panel and the

rear cover.

Remove the control switch board on the back of the

front panel.

1.

2.

3.

II

Fig. 11

Fig. 13

Fig. 12

LCD & Key control board

Joint h

Joint h Joint h

Joint h

Front panel

Rear cover

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1-8

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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1-9

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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1-10

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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1-11

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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1-12

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

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1-13

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 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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1-14

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 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

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1-15

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

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Q

TEL 13942296513 QQ 376315150 892498299

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KD-SX985

1-16

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

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Q

TEL 13942296513 QQ 376315150 892498299

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KD-SX985

1-17

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

9

4

2

9

6

5

1

3

9

2

8

9

4

2

9

8

0

5

1

5

1

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6

7

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Q

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KD-SX985

1-18

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

9

8

T

E

L

1

3

9

4

2

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6

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1

3

9

2

8

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4

2

9

8

0

5

1

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Q

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KD-SX985

1-19

Adjustment method

Test instruments required 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.Test disc (CTS-1000)

8.Extension cable for check

Standard measuring conditions

Power supply voltage DC 14.4V(11V to 16V allowance)

Load impedance 4 (4 to 8 allowance)

Line-out Level/Impedance

: 2.0 V/20k load(full scale)

Output impedance : 1k

How to connect the extension cable for adjusting

Standard volume position

Balance and Bass & Treble volume : Indication "0"

Loudness : OFF

FM 87.5MHz - 108.0 MHz

AM 530kHz - 1710kHz

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 workingo

standard.

EXTGS004-26P

Frequency Band

EXTGS004-26P

Extension cable

CD 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

9

8

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0

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1

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Q

TEL 13942296513 QQ 376315150 892498299

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KD-SX985

1-20

When the pickup correctly moves

to the inner area of the disc

v

Microprocessor

commands

FMO

TC94A14FA" 40"

FEED MOTOR

+TERMINAL

IC561"4"

REST SW

When correctly focused

Focus Servo Loop ONo

Power ON

Set Function CD

Disc inserted

Pickup feed to the inner area

YES

Laser emitted

Focus search

YES

Disc rotates

RF signal eye-patternn

remains closed

Tracking loop closed

RF signal eye-pattern

opens

TOC read out

Jump to the first track

Play

When the laser diode correctly

emits

Microprocessor

commands

SEL

TC94A14FA"38"

LD

CN501"15"

"No disc"

display

When the disc correctly rotates

Microprocessor

commands

DMO

TC94A14FA"41"

Spindle

motor(-)

IC561"1"

Tracking Servo Loop ON

RF signal

Rough Servo Modev

CLV Servo Mode

(Program Area)

CLV Servo Mode

(Lead-In Area;

Digital :0)

Flow of functional operation unit TOC read

$83 $82 $81

0V

6V

4V

2V

OFF

ON

3.3V

Hi-Z

FEO

TA2157" 15"

2.2V

$84

3.3V

0V

4V

0V

$84 $86 $ A200

3.3V

2.2V

0V

6V

3.2

2V

Rough

Servo

Acceleration Servo CLV

0.5 Sec0.5 Sec

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

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6

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1

3

9

2

8

9

4

2

9

8

0

5

1

5

1

3

6

7

3

Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

JVC KD-SX985, KD-SX885 User manual

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