Jvc Kd-lx555r User manual

SERVICE MANUAL

2003/5

CD RECEIVER

4979320034

KD-LX555R

TABLE OF CONTENTS

1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

S

KD-LX555R

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STDM

SOURCE

Area Suffix

E ------ Continental Europe

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1-2 (No.49793)

SPECIFICATION

Design and specifications are subject to change without notice.

AUDIO AMPLIFIER SECTION Maximum Power Output Front 50 W per channel

Rear 50 W per channel

Continuous Power Output (RMS) Front 19 W per channel into 4 Ω, 40 Hz to 20 000 Hz

at no more than 0.8% total harmonic distortion.

Rear 19 W per channel into 4 Ω, 40 Hz to 20 000 Hz

at no more than 0.8% total harmonic distortion.

Load Impedance 4 Ω(4 Ωto 8 Ωallowance)

Equalizer Control Range: LOW ±12 dB (50 Hz, 80 Hz, 120 Hz)

MID ±12 dB (700 Hz, 1 kHz, 2 kHz)

HIGH ±12 dB (8 kHz, 12 kHz)

Frequency Response 40 Hz to 20 000 Hz

Signal-to-Noise Ratio 70 dB

Line-Out Level/Impedance 2.0 V/20 kΩload (full scale)

Output Impedance 1 kΩ

TUNER SECTION Frequency Range FM 87.5 MHz to 108.0 MHz

AM (MW) 522 kHz to 1 620 kHz

(LW) 144 kHz to 279 kHz

[FM Tuner]

Usable Sensitivity 11.3 dBf (1.0 µV/75 Ω)

50 dB Quieting Sensitivity 16.3 dBf (1.8 µV/75 Ω)

Alternate Channel Selectivity (400 kHz) 65 dB

Frequency Response 40 Hz to 15 000 Hz

Stereo Separation 30 dB

Capture Ratio 1.5 dB

[MW Tuner]

Sensitivity 20 µV

Selectivity 35 dB

[LW Tuner]

Sensitivity 50 µV

CD PLAYER SECTION Type Compact disc player

Signal Detection System

Non-contact optical pickup (semiconductor laser)

Number of channels 2 channels (stereo)

Frequency Response 5 Hz to 20 000 Hz

Dynamic Range 98 dB

Signal-to-Noise Ratio 102 dB

Wow and Flutter Less than measurable limit

MP3 decoding format

MPEG1/2 Audio Layer 3

Max. Bit Rate:320 Kbps

GENERAL Power Requirement: Operating Voltage DC 14.4 V (11 V to 16 V allowance)

Grounding System Negative ground

Allowable Operating Temperature 0°C to +40°C

Dimensions (W ×H ×D) Installation Size 182 mm ×52 mm ×160 mm

Panel Size 188 mm ×58 mm ×8 mm

Mass 1.8 kg (excluding accessories)

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SECTION 1

Precautions

1.1 Safety Precautions

!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.

!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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1-4 (No.49793)

1.2 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.

1.2.1 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.

(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.

1.3 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.

1.4 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 before the flexible wire is disconnected from the connector on the CD pickup unit.

(If the flexible wire is disconnected without applying solder, the CDpickup may be destroyed by static electricity.)

• In the assembly, be sure to remove solder from the short land after connecting the flexible wire.

1M

(caption)

Anti-static wrist strap

Conductive material

(conductive sheet) or iron plate

Connector board

Soldering

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(No.49793)1-5

SECTION 2

Disassembly method

2.1 Main body

2.1.1 Removing the top chassis

(See Fig.1~5)

(1) Remove the two screws Aattaching the bottom cover to

the top chassis on the bottom of the body.

(2) Remove the two screws Battaching the top chassis on

both sides of the body.

(3) Remove the screw Cand the thee screws Dattaching the

heat sink on the left side of the body.

(4) Remove the two screws Eand the screw Fon the back of

the body.

(5) Remove the two screws Gon the upper side of the body.

(6) 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.

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

A

Bottom cover

B

Top chassis

C

DB

D

Heat sink

Top chassis

EF

G

Top chassis

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1-6 (No.49793)

2.1.2 Removing the front panel assembly

(See Fig.6~8)

• Prior to performing the following procedure, remove the top

chassis assembly.

(1) Disconnect the flexible harness from connector CN701 on

the main board assembly.

(2) Remove the four screws Hattaching the front panel as-

sembly on both sides of the body. Remove the front panel

toward the front.

Fig.6

Fig.7

Fig.8

CN701

Front panel assembly

H

Front panel assembly

H

Front panel assembly

CN701

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2.1.3 Removing the Front Board

(See Fig.9)

• Prior to performing the following procedure, remove the top

chassis assembly and the front panel assembly.

(1) Remove the four screws Iattaching the front board on the

back of the front panel assembly and release the eight

joints a.

Fig.9

2.1.4 Removing the lifter unit

(See Fig.10)

• Prior to performing the following procedure, remove the top

chassis assembly and the front panel assembly.

(1) Disconnect the harness from connector CN830 and CN831

on the main board.

(2) Remove the four screws Jand detach the lifter unit from

the bottom cover.

Fig.10

II

Joints a

J

CN830

CN831

Lifter unit assembly

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1-8 (No.49793)

2.1.5 Removing the feed motor (L)

(See Fig.11)

• Prior to performing the following procedure, remove the lifter

unit.

(1) Remove the washer attaching the clutch assembly and de-

tach the clutch assembly from the shaft of the lifter unit.

(2) Remove the two screws Kattaching the feed motor (L).

Fig.11

2.1.6 Removing the feed motor (R)

(See Fig.12)

• Prior to performing the following procedure, remove the lifter

unit.

(1) Remove the washer attaching the clutch assembly and de-

tach the clutch assembly from the shaft of the lifter unit.

(2) Remove the two screws Lattaching the feed motor (R).

Fig.12

Lifter unit assembly

Washer

Clutch assembly

K

Feed motor (L) assembly

L

Clutch assembly

Lifter unit assembly

Washer

Feed motor (R) assembly

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(No.49793)1-9

2.1.7 Removing the operation assembly

(See Fig.13~16)

• Prior to performing the following procedure, remove the top

chassis assembly, the front panel assembly and the lifer unit.

(1) Disconnect the card wire from connector CN702 on the

main board and remove the operation assembly.

(2) Remove the three screws Mattaching the right and left

brackets, which fix gears on both sides of the operation as-

sembly.

(3) Remove the springs 5and 6from the operation assembly.

ATTENTION:

When reassembling, correctly engage the switch S651 and

S652 on the main board and the right gear with the part bof

the operation assembly.

Fig.13

Fig.14

Fig.15

Fig.16

MM

Bracket (L) Bracket (R)

Spring 5

Spring 6

CN702 Operation assembly

S652

S651

Operation assembly b

bOperation assembly

Bracket (R)

S652 S651

Operation assembly b

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1-10 (No.49793)

2.1.8 Removing the operation switch board

(See Fig.17~19)

• Prior to performing the following procedure, remove the oper-

ation assembly.

(1) Remove the six screws Nattaching the button panel on the

operation assembly.

(2) Release the bottom panel from the bottom base at the bot-

tom of the operation switch assembly five joint cand re-

move the bottom panel.

(3) Pull out the operation switch board from inside of the button

panel.

Fig.17

Fig.18

Fig.19

NN

Button panel

CC

Button base

Button panel

Operation switch board

Button panel

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(No.49793)1-11

2.1.9 Removing the MP3 board assembly

(See Fig.20,21)

• Prior to performing the following procedure, remove the top

chassis.

Caution:

Before disconnecting the card wire from connector CN601 on

the MP3 board, solder the short-circuit point on the connector

board in the CD mechanism assembly (Refer to Fig.20).

(1) Disconnect the card wire from connector CN601 on the

MP3 board assembly.

(2) Remove the five screws Oattaching the MP3 board as-

sembly and release the joint dand e.

Caution:

When reattaching the MP3 board, connect the card wire ex-

tending from the connector board to connector CN601 and un-

solder the short-circuit point (Refer to Fig.21).

Fig.20

Fig.21

2.1.10 Removing the CD mechanism assembly

(See Fig.22)

(1) Remove the three screws Pand the CD mechanism as-

sembly from the top chassis.

Fig.22

Connector board

Soldering

ed

OO

OOO

CN601

MP3 board

P

PP

CD mechanism assembly

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1-12 (No.49793)

2.1.11 Removing the main board assembly

(See Fig.23~25)

• Prior to performing the following procedure, remove the top

chassis.

(1) Disconnect the flexible harness from connector CN701, the

card wire from CN702 on the main board and the harness

from CN830 and CN831 respectively.

(2) Remove the three screws Qattaching the main board as-

sembly to the bottom cover on the upper side of the body.

(3) Remove the screw Rattaching the rear panel and the bot-

tom cover on the back of the body. Move the main board in

the direction of the arrow and release the two joints f. (At

this point, the main board can be removed with the rear

panel and the rear heat sink.)

(4) Remove the three screws Sattaching the rear heat sink on

the back of the body.

(5) Remove the two screws Tand the screw Uattaching the

rear panel. Now, the main board assembly will be removed.

ATTENTION:

When reassembling, correctly engage the switch S651 and

S652 on the main board and the right gear with the part bof

the operation assembly (Refer to Fig.24).

Fig.23

Fig.24

Fig.25

Q

CN830 CN831

CN701

Q

Joint f

CN702

Front panel assembly

S652

S651

Main board

b

T

USR

ST

Rear heat sink

Rear panel

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(No.49793)1-13

2.2 CD Mechanism section

2.2.1 Removing the top cover

(See Figs.1 and 2)

(1) Remove the four screws Aon the both side of the body.

(2) Lift the front side of the top cover and move the top cover

backward to release the two joints a.

Fig.1

Fig.2

A

Joints a

Top cover

Joints a

Top cover

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1-14 (No.49793)

2.2.2 Removing the connector board

(See Figs.3 to 5)

CAUTION:

Before disconnecting the flexible wire from the pickup, solder

the short-circuit point on the pickup. No observance of this in-

struction may cause damage of the pickup.

(1) Remove the screw Bfixing the connector board.

(2) Solder the short-circuit point on the pickup.

(3) Disconnect the flexible wire from the pickup.

(4) Move the connector board in the direction of the arrow to

release the two joints b.

(5) Unsolder the wires on the connector board if necessary.

CAUTION:

Unsolder the short-circuit point after reassembling.

Fig.3

Fig.4

Fig.5

B

Connector board

Pickup

Short-circuit point

Joints b

Wires

Pickup

Short-circuit point

(Soldering)

Flexible wire

B

Flexible wire

Connector board

Frame

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(No.49793)1-15

2.2.3 Removing the DET switch

(See Figs.6 and 7)

(1) Extend the two tabs cof the feed sw. holder and pull out

the switch.

(2) Unsolder the DET switch wire if necessary.

Fig.6

Fig.7

Connector

board

DET

switch

Pickup

DET switch Tab c

Tab c

DET switch wire

Feed sw. holder

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1-16 (No.49793)

2.2.4 Removing the chassis unit

(See Figs.8 and 9)

• Prior to performing the following procedure, remove the top

cover and connector board.

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

the chassis unit to the frame.

CAUTION:

• The shape of the suspension spring (L) and (R) are dif-

ferent. Handle them with care.

• When reassembling, make sure that the three shafts

on the underside of the chassis unit are inserted to the

dampers certainly.

Fig.8

Fig.9

Suspension spring (L)

Suspension spring (R)

Chassis unit

Frame

Chassis unit

Frame

Shafts

Shaft

Dampe

r

Damper

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(No.49793)1-17

2.2.5 Removing the clamper assembly

(See Figs.10 and 11)

• Prior to performing the following procedure, remove the top

cover.

(1) Remove the clamper arm spring.

(2) Move the clamper assembly in the direction of the arrow to

release the two joints d.

Fig.10

Fig.11

Clamper arm

spring

Chassis rivet

assembly

Joint d

Joint d Clamper assembly

Clamper arm spring

Clamper assembly

Joint d

Chassis rivet assembly

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Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

1-18 (No.49793)

2.2.6 Removing the loading / feed motor assembly

(See Figs.12 and 13)

• Prior to performing the following procedure, remove the top

cover, connector board and chassis unit.

(1) Remove the screw Cand move the loading / feed motor as-

sembly in the direction of the arrow to remove it from the

chassis rivet assembly.

(2) Disconnect the wire from the loading / feed motor assembly

if necessary.

CAUTION:

When reassembling, connect the wire from the loading /

feed motor assembly to the flame as shown in Fig.12.

Fig.12

Fig.13

Loading / feed motor assembly

C

w

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c

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Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

(No.49793)1-19

2.2.7 Removing the pickup unit

(See Figs.14 to 18)

• Prior to performing the following procedure, remove the top

cover, connector board and chassis unit.

(1) Remove the screw Dand pull out the pu. shaft holder from

the pu. shaft.

(2) Remove the screw Eattaching the feed sw. holder.

(3) Move the part eof the pickup unit upward with the pu. shaft

and the feed sw. holder, then release the joint fof 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.

(4) Remove the pu. shaft from the pickup unit.

(5) Remove the screw Fattaching the feed rack to the pickup

unit.

2.2.8 Reattaching the pickup unit

(See Figs.14 to 17)

(1) Reattach the feed rack to the pickup unit using the screw F.

(2) Reattach the feed sw. holder to the feed rack while setting

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

of the feed rack to the switch of the feed sw. holder correct-

ly.

(3) 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.

CAUTION:

Make sure that the part i on the underside of the feed

rack is certainly inserted to the slot j of the change lock

lever.

(4) Reattach the feed sw. holder using the screw E.

(5) Reattach the pu. shaft to the pickup unit. Reattach the pu.

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

Fig.14

Fig.15

Fig.16

Fig.17

Fig.18

Feed sw. holder

E

D

Joint g

Joint f

Part e

Pickup unit

Pu. shaft holder

Pu. shaft

Feed sw. holder

Part e

Pickup unit

Feed rack

Feed sw. holder

D

E

Joint f

Pu. shaft holde

r

Pu. shaft

Pickup unit

Joint h

Part i

Slot j

Joint g

FFeed rack

Pickup unit

Joint f

Joint g

Feed rack

Pickup unit

Feed sw. holder

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

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1

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1

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Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

1-20 (No.49793)

2.2.9 Removing the trigger arm

(See Figs.19 and 20)

• Prior to performing the following procedure, remove the top

cover, connector board and clamper unit.

(1) Turn the trigger arm in the direction of the arrow to release

the joint kand pull out upward.

CAUTION:

When reassembling, insert the part m and n of the trigger

arm into the part p and q at the slot of the chassis rivet

assembly respectively and join the joint kat a time.

Fig.19

Fig.20

2.2.10 Removing the top plate assembly

(See Fig.21)

• Prior to performing the following procedure, remove the top

cover, connector board, chassis unit, and clamper assembly.

(1) Remove the screw H.

(2) Move the top plate assembly in the direction of the arrow to

release the two joints r.

(3) Unsolder the wire marked s if necessary.

Fig.21

Joint k

Trigger arm

Chassis rivet assembly

Trigger arm

Chassis

rivet

assembly

Part p

Part m

Part n

Part q

Top plate assembly

Joints

r

s

H

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c

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Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

JVC KD-LX555R User manual

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