Jvc KD-SHX705 Service Manual

SERVICE MANUAL

CD RECEIVER

MA04820045

KD-SHX705

Area suffix

U -------------------- Other Areas

SOURCE

PICT

BAND

BACK

DISP

KD-SHX705

TABLE OF CONTENTS

1 PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32

No.MA048

2004/5

SPECIFICATION

AUDIO AMPLIFIER SECTION

Maximum Power Output Front 50 W per channel

Rear 50 W per channel

Continuous Power Output (RMS)

Load Impedance 4 Ω (4 Ω to 8 Ω allowance)

Equalizer Control Range Frequencies 60 Hz, 150 Hz, 400 Hz, 1 kHz, 2.4 kHz, 6 kHz, 12 kHz

Frequency Response 40 Hz to 20 000 Hz

Signal-to-Noise Ratio 70 dB

Line-In Level/Impedance LINE IN 1.5 V/20 kΩ load Line-Out Level/Impedance 5.0 V/20 kΩ load (full scale) Output Impedance 1 kΩ

Other Terminals SUBWOOFER OUT

Frequency Range FM 87.5 MHz to 108.0 MHz

[FM Tuner] Usable Sensitivity 11.3 dBf (1.0 µV/75 Ω)

[AM Tuner] Sensitivity 20 µV

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 (MPEG Audio Layer 3) Max. Bit rate 320 Kbps

WMA (Windows Media Audio) Max. Bit rate 192 Kbps

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

Grounding System Negative ground

Allowable Operating Temperature 0ºC to +40ºC (32ºF to 104ºF)

Dimensions (W × H × D) Installation Size 182 mm × 52 mm × 157 mm

Mass 1.7 kg (excluding accessories)

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.

Level ±10 dB

Changer control

TUNER SECTION

AM 531 kHz to 1 602 kHz

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 35 dB

Capture Ratio 1.5 dB

Selectivity 65 dB

CD PLAYER SECTION

GENERAL

Panel Size 188 mm × 58 mm × 13 mm

Design and specifications are subject to change without notice.

1-2 (No.MA048)

1.1 Safety Precautions

SECTION 1

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.

(No.MA048)1-3

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.

(caption) Anti-static wrist strap

Conductive material (conductive sheet) or iron plate

(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 CD pickup may be destroyed by static electricity.)

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

Short-circuit point

Flexible wire

1-4 (No.MA048)

1.5 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 CD,MD and DVD 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 here in may result in

hazardous radiation exposure.

Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check.

REPRODUCTION AND POSITION OF LABELS

WARNING LABEL

CAUTION : Visible and Invisible

CLASS 1 LASER PRODUCT

laser radiation when open and interlock failed or defeated. AVOID DIRECT EXPOSURE TO BEAM. (e)

ADVARSEL : Synlig og usynlig laserstråling når maskinen er åben eller interlocken fejeler. Undgå direkte eksponering til stråling. (d)

VARNING : Synlig och osynling laserstrålning när den öppnas och spärren är urkopplad. Betrakta ej strålen. (s)

VARO : Avattaessa ja suojalukitus ohitettuna tai viallisena olet alttiina näkyvälle ja näkymättömälle lasersäteilylle. Vältä säteen kohdistumista suoraan itseesi. (f)

(No.MA048)1-5

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-6 (No.MA048)

SECTION 3

DISASSEMBLY

3.1 Main body section

3.1.1 Removing the front panel assembly (See Fig.1)

(1) Push the detach button in the lower right part of the front

panel assembly.

(2) Remove the front panel assembly.

3.1.2 Removing the heat sink (See Fig.2)

(1) From the left side of the main body, remove the two screws

A and three screws B attaching the heat sink.

Front panel assembly

Detach button

Fig.1

AAB

Heat sink

Fig.2

(No.MA048)1-7

3.1.3 Removing the top chassis assembly (See Figs.3 to 6)

• Prior to performing the following procedures, remove the heat

sink.

Reference:

Remove the front panel assembly as required. (1) From the bottom side of the main body, remove the two

screws C attaching the top chassis assembly to the bottom chassis assembly. (See Fig.3)

(2) From the both and rear sides of the main body, remove the

four screws D attaching the top chassis assembly to the bottom chassis assembly. (See Figs.4 to 6)

(3) Lift the top chassis assembly in the direction of the arrow,

and disconnect the connector CN501 control board from the connector CN702 on the main board. (See Figs.5 and 6)

(4) Take out the top chassis assembly from the bottom chassis

assembly.

on the mechanism

Bottom chassis assembly

Top chassis assembly

Fig.3

Top chassis assembly

Bottom chassis assembly

Top chassis assembly

Main board

Bottom chassis assembly

Top chassis assembly

Bottom chassis assembly

Fig.4

Mechanism control board

CN501

CN702

Fig.5

Rear bracket

Fig.6

1-8 (No.MA048)

3.1.4 Removing the front chassis

(See Figs.7 and 8)

• Prior to performing the following procedure, remove the front

panel assembly, heat sink and top chassis assembly. (1) From the both sides of the top chassis assembly, remove

the two screws E attaching the front chassis.

3.1.5 Removing the CD mechanism assembly

(See Fig.9)

• Prior to performing the following procedures, remove the front

panel assembly, heat sink and top chassis assembly. (1) From the inside of the top chassis assembly, remove the

three screws F attaching the CD mechanism assembly.

(2) Take out the CD mechanism assembly from the top chas-

sis.

Top chassis assembly

Front chassis

Fig.7

Top chassis assembly

Front chassis

Fig.8

Top chassis

CD mechanism assembly

Fig.9

(No.MA048)1-9

3.1.6 Removing the main board (See Figs.10 and 11)

• Prior to performing the following procedures, remove the front

panel assembly, heat sink and top chassis assembly. (1) From the rear side of the bottom chassis assembly, remove

the two screws G attaching the rear bracket to the bottom chassis assembly. (See Fig.10)

(2) From the top side of the bottom chassis assembly, remove

the two screws H attaching the main board to the bottom chassis assembly. (See Fig.11)

(3) Release the stopper of the connector CN701

board in an upward direction, disconnect the card wire from the connector CN701

(4) Disconnect the wire from the connector of the front door

mechanism assembly. (See Fig.11)

(5) Disconnect the wire from the connectors CN991

CN992 on the main board. (See Fig.11)

Reference:

After connecting the wires, fix the wires with the wire holders.

(6) Take out the main board from the bottom chassis assem-

bly.

. (See Fig.11)

on the main

and

Rear bracket

Front door mechanism assembly

Connector

Wire holder

Card wire

Bottom chassis assembly

Fig.10

CN701

Stopper

Bottom chassis assembly

3.1.7 Removing the rear bracket (See Fig.12)

• Prior to performing the following procedures, remove the front

panel assembly, heat sink, top chassis assembly and main board. (1) From the rear side of the main board, remove the wires

from the rear bracket in the direction of the arrow.

(2) Remove the four screws J attaching the rear bracket to the

main board.

Reference:

After attaching the rear bracket to the main board, pass the wires through the wire holder and insert them into the slots of the rear bracket.

1-10 (No.MA048)

Wire holder

Main board

Rear bracket

CN991

CN992

Wires

Fig.11

Fig.12

3.1.8 Removing the front door mechanism assembly

(See Fig.13)

• Prior to performing the following procedures, remove the front

panel assembly, heat sink, top chassis assembly and main board. (1) From the top side of the bottom chassis assembly, remove

the screw K attaching the shaft holder to the bottom chassis.

(2) Remove the five screws L attaching the front door mecha-

nism assembly to the bottom chassis.

Reference:

When attaching the screws M and N, apply a locking agent them.

(3) Take out the front door mechanism assembly from the bot-

tom chassis.

Front door mechanism assembly

Bottom chassis

3.1.9 Removing the front board

(See Figs.14 to 16)

• Prior to performing the following procedures, remove the front

panel assembly. (1) From the rear side of the front panel assembly, remove the

six screws M attaching the rear cover assembly to the front panel assembly. (See Fig.14)

(2) Release the twelve joints a of the front panel assembly and

remove the rear cover assembly. (See Fig.15)

(3) Take out the front board from the front panel assembly.

(See Fig.16)

Caution:

Take care not to lose the spring.

Shaft holder

Rear cover assembly

Fig.13

Fig.14

Joints a

Front panel assembly

Spring

Joints a

Fig.15

Front board

Fig.16

(No.MA048)1-11

3.2 CD mechanism assembly

• Prior to performing the following procedure "Removing the CD mechanism assembly".

3.2.1 Removing the front-end board (See Fig.1)

(1) From the top side of the CD mechanism assembly, solder

the short-circuit point on the flexible wire extending from the CD pickup.

Caution:

Solder the short-circuit points on the flexible wire extending from the DVD pickup. If you do not follow this instruction, the DVD pickup may be damaged.

(2) Disconnect the flexible wire from connector CN601

front-end board.

(3) Disconnect the flexible wire from connector CN503

front-end board.

(4) Remove the solders from two solder points a on the front-

end board and disconnect the wire extending from the feed motor.

(5) Remove the solders from six solder points b on the front-

end board disconnect the wires extending from the spindle motor, SW board and reset SW board.

(6) Remove the five screws A attaching the front-end board.

Caution:

Unsolder the solders from the short-circuit points after reassembling.

on the

Short-circuit point

Flexible wire

CN601

Spindle motor

Feed motor

Front end board

Fig.1

Solder point a

Solder point b

CN503

1-12 (No.MA048)

3.2.2 Removing the top cover

(See Fig.2)

(1) From the back side of the CD mechanism assembly, re-

move the two screws B attaching the top cover.

(2) Take out the top cover upward.

Reference:

When reassembling the top cover, set parts c of the top cover under the bending parts d of the chassis base.

3.2.3 Removing the mechanism section

(See Figs.2 to 4)

• Prior to performing the following procedure, remove the top

cover. (1) From the front side of the CD mechanism assembly, re-

move the two screws C attaching the right and left stoppers. (See Fig.2)

(2) Remove the two floating springs on the bottom of the body.

(See Fig.3)

(3) Take out the mechanism section upward, and remove the

three damper springs from the dampers. (See Fig.4)

Caution:

• When reassembling the mechanism section, reattach the damper spring to the damper respectively and insert the three shafts on the bottom of the mechanism to the dampers. (See Fig.4)

• Before inserting the shaft to the dampers, apply IPA to the hole of damper.

Stopper

Top cover

Stopper

Fig.2

Parts c

Parts d

Chassis base

Damper spring(F) (Silver)

Damper (Black)

Damper spring(F) (Silver)

Floating spring

Damper (Black)

Fig.3

Mechanism section

Damper spring(R) (Red)

Damper (Purple)

Chassis base

Fig.4

(No.MA048)1-13

3.2.4 Removing the clamper unit (See Figs.5 and 6)

• Prior to performing the following procedures, remove the top

cover and mechanism section. (1) From the bottom of the mechanism section, remove the

clamper spring2. (See Fig.5)

(2) Release part e of the clamper spring from the bending part

of the chassis base assembly. (See Fig.6)

(3) Move the clamper unit in the direction of the arrow, and re-

lease the two joints f and g. (See Fig.5)

(4) Take out the clamper unit upward. (See Fig.5)

Clamper unit

Joint f

Clamper2 spring

Clamper spring

Joint g

Fig.5

Part h

1-14 (No.MA048)

Chassis base

Part e

Fig.6

3.2.5 Reattaching the clamper unit

(See Figs.5 to 9)

(1) From the bottom of the mechanism section, attach the

clamper spring2 to the clamper unit. (See Figs.5 and 7)

(2) Move the clamper unit to set the side joints f and g to each

boss of the chassis base. (See Fig.5)

(3) Make sure that part h is inserted to the notch of the chassis

base. (See Figs.5 and 8)

(4) Move the clamper spring to the outside of the bending part

of the chassis base. (See Fig.9)

Caution:

When reattaching the clamper unit, temporarily hook the end of the clamper spring as shown in the figure to make the work easy. (See Fig.9)

Clamper2 spring

Chassis base

Fig.7

Clamper unit

Notch

Part h

Fig.8

Clamper spring

Fig.9

(No.MA048)1-15

3.2.6 Removing the front unit (See 10 to 12)

• Prior to performing the following procedures, remove the top

cover and mechanism section. (1) From the bottom side of the mechanism section, discon-

nect the flexible wire from connector CN503 end board. (See Fig.10)

(2) From the top of the mechanism section, remove the screw

D attaching the front unit. (See Fig.11)

(3) Move the front unit toward the front to release joint i. (See

Fig.11)

(4) Release two joints j and k on the right side of the chassis

base. (See Fig.12)

(5) Take out the front unit upward, and remove the two screws

E attaching the switch wire. (See Fig.12)

Reference:

You can remove the switch wire only without removing the front unit.

Caution:

When reassembling, attach the flexible wire extending from the switch wire using a double-stick tape. (See Fig.12)

on the front-

Front-end board

Flexible wire

CN503

Fig.10

Front unit

Double-stick tape

Joint j

Joint k

Chassis base

Fig.11

Fig.12

Joint i

Switch wire

Front unit

Joint i

1-16 (No.MA048)

3.2.7 Removing the loading arm S.A.

(See Figs.13 and 14)

• Prior to performing the following procedures, remove the top

cover, mechanism section and front unit. (1) From top side of the front unit, move the loading arm S.A.

from the front upwards. (See Fig.13)

(2) Release the bosses from the right and left joints m and n of

the chassis base. (See Figs.13 and 14)

(3) Release the boss from notch p of the connect arm on the

right side of the body, and release the boss from notch q of the slide cam assembly on the left side. (See Fig.14)

Joint n

Side cam assembly

Notch q

Joint n

Loading arm S.A.

Joint m

Fig.13

Loading arm S.A.

Joint m

Notch p

Fig.14

Notch p

Connect arm

(No.MA048)1-17

3.2.8 Removing the rod (L)(R) and roller assembly (See Figs.15 and 16)

• Prior to performing the following procedures, remove the top

cover, mechanism section, front unit and loading arm S.A. (1) From the bottom side of the loading arm S.A., release the

rod (L) and (R) from the joints r. (See Fig.15)

(2) Remove the roller assembly from the loading assembly.

(See Fig.16)

(3) Remove the two collars and washer from the roller assem-

bly. (See Fig.16)

Caution:

After attaching the roller assembly to the loading arm S.A., attach the rod (L) and (R). Attach the rods to the right and left collars of the roller. (See Fig.15)

Collar

Joints r

Collar

Rod(R) Rod(L)

Joints r

Rod(L)

Rod(R)

Collar

Joints r

Loading arm S.A.

Rod(L)

Joints r

Fig.15

Collar

Washer

Roller assembly

Rod(R)

Loading arm S.A.

Fig.16

1-18 (No.MA048)

3.2.9 Removing the CD pickup assembly

(See Figs.17 to 19)

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

end board. (1) From the bottom of the CD mechanism assembly, turn the

feed gear in the direction of the arrow to move the CD pickup assembly outwards. (See Fig.17)

(2) Remove the screw F attaching the thrust spring. (See

Fig.17)

(3) Remove the CD pickup assembly upward from the side of

L.S.gear and release sub shaft from joint s. (See Fig.18)

(4) Move the lead screw of the CD pickup assembly in the di-

rection of the arrow to release at joint t. (See Fig.18)

(5) Remove the screw G attaching the rack spring and rack

plate on the CD pickup. (See Fig.19)

(6) Pull out the lead screw. (See Fig.19)

Caution:

• When reattaching the CD pickup assembly, reattach the sub shaft at section s of the CD pickup assembly to the sub guide first, and attach the lead screw shaft to the joint t on the L.S.holder2. (See Fig.18)

• Perform adjustment after replacing the pickup.

CD Pickup assembly

Thrust spring

Joint t

L.S.holder 2

Feed gear

Fig.17

CD Pickup assembly

Lead screw

Sub shaft

Sub guide

Joint s

Rack spring

Rack plate

L.S.Collar

L.S.Gear

Fig.18

Lead screw

L.S.Gea

CD Pickup

Fig.19

(No.MA048)1-19

3.2.10 Removing the spindle motor

(See Fig.20)

• Prior to performing the following procedure, remove the frontend board. (1) From the bottom side of the CD mechanism assembly, re-

move the T.table assembly and washer from the spindle motor.

(2) Remove the two screws H attaching the spindle motor.

Caution:

Perform adjustment when reattaching the spindle motor.

3.2.11 Removing the FL motor S.A.

(See Figs.21 and 22)

• Prior to performing the following procedure, remove the frontend board. (1) From the top side of the CD mechanism assembly, remove

the F.T.spring. (See Fig.21)

(2) Remove the two screws J attaching the FL motor S.A. (See

Fig.21)

(3) Remove the slit washer from the motor H.assembly and

pull out the worm wheel. (See Fig.22)

(4) Remove the two screws K attaching the FL motor. (See

Fig.22)

T. table assembly

Washer

F.T.Spring

Spindle motor

Fig.20

FL Motor S.A.

1-20 (No.MA048)

Fig.21

Slit washer

Worm wheel

FL Moto

Motor H.assembly

Fig.22

3.2.12 Removing the SW board and reset SW board (See Fig.23)

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

end board. (1) From the top side of the CD mechanism assembly, remove

the screw L attaching the SW board.

(2) Remove the screw M attaching the reset SW board.

Reset SW boardSW board

Fig.23

(No.MA048)1-21

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