Jvc KD-S25J, KD-G446UT, KD-G445UT, KD-G44UI, KD-G446UN User Manual

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SERVICE MANUAL

MA376<Rev.002>20085SERVICE MANUAL

CD RECEIVER

KD-AR390J, KD-G340J,

KD-G444UI, KD-G445U,

KD-G445UN, KD-G445UT,

KD-G445UH, KD-G446U,

KD-G446UN, KD-G446UT,

KD-G446UH, KD-S25J

only for KD-AR390/KD-G340/KD-S25

Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade) Lead free solder used in the board (material : Sn-Cu, melting point : 230 Centigrade)

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19 5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20

No.MA376<Rev.002>

2008/5

SPECIFICATION

KD-AR390/KD-G340/KD-S25

AUDIO AMPLIFIER SECTION

Power Output 20 W RMS × 4 Channels at 4 Ω and < or = 1% THD+N Signal-to-Noise Ratio 80 dBA (reference: 1 W into 4 Ω) Load Impedance 4 Ω (4 Ω to 8 Ω allowance)

Tone Control Range Bass ±12 dB (60 Hz, 80 Hz, 100 Hz, 120 Hz)

Mid-range ±12 dB (500 Hz, 1.0 kHz, 1.5 kHz, 2.5 kHz)

Treble ±12 dB (7.5 kHz 10.0 kHz 12.5 kHz 15.0 kHz)

Q (band width) Q0.5 to Q2.0

Frequency Response 40 Hz to 20 000 Hz

Line-Out Level/Impedance KD-AR390 5.0 V/20 kΩ load (full scale)

KD-G340/KD-S25 2.5 V/20 kΩ load (full scale)

Subwoofer-Out Level/Impedance

Output Impedance 1 kΩ

Other Terminal AUX (auxiliary) input jack CD changer jack Steering wheel remote

Frequency Range FM

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 96 dB

Signal-to-Noise Ratio 98 dB

Wow and Flutter Less than measurable limit

MP3 Decoding Format (MPEG1/2 Audio Layer 3)

WMA (Windows Media® Audio) Decoding Format

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 (32°F to 104°F)

Dimensions (W × H × D) (approx.)

Mass 1.3 kg (2.9 lbs) (excluding accessories)

Design and specifications are subject to change without notice.

KD-AR390 5.0 V /20 kΩ load (full scale) KD-G340/KD-S25 2.5 V/20 kΩ load (full scale)

input (only for KD-AR390) Antenna

TUNER SECTION

with channel interval set to 100 kHz or 200 kHz : 87.5 MHz to 107.9 MHz with channel interval set to 50 kHz : 87.5 MHz to 108.0 MHz

AM with channel interval set to 10 kHz : 530 kHz to 1 710 kHz

with channel interval set to 9 kHz : 531 kHz to 1 602 kHz

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

Alternate Channel Selectivity (400 kHz)

Frequency Response 40 Hz to 15 000 Hz

Stereo Separation 35 dB

Selectivity 35 dB

CD PLAYER SECTION

Max. Bit Rate 320 kbps

Max. Bit Rate 192 kbps

Installation Size 182 mm × 52 mm × 160 mm (7-3/16” × 2-1/16” × 6-5/16”) Panel Size 188 mm × 58 mm × 6 mm (7-7/16” × 2-5/16” × 1/4”)

65 dB

GENERAL

1-2 (No.MA376<Rev.002>)

KD-G444/KD-G445/KD-G446

AUDIO AMPLIFIER SECTION

Maximum Power Output Front/Rear 50 W per channel

Continuous Power Output (RMS)

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

Tone Control Range Bass ±12 dB (60 Hz, 80 Hz, 100 Hz, 120 Hz)

Frequency Response 40 Hz to 20 000 Hz

Signal-to-Noise Ratio 70 dB

Line-Out Level/Impedance 2.5 V/20 kΩ load (full scale) Subwoofer-Out Level/Impedance 2.5 V/20 kΩ load (full scale) Output Impedance 1kΩ

Other Terminal AUX (auxiliary) input jack, CD changer jack

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 96 dB

Signal-to-Noise Ratio 98 dB

Wow and Flutter Less than measurable limit

MP3 Decoding Format (MPEG1/2 Audio Layer 3)

WMA (Windows Media® Audio) Decoding Format

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) (approx.)

Mass 1.3 kg (excluding accessories)

Design and specifications are subject to change without notice.

Front/Rear 19 W per channel into 4 Ω 40 Hz to 20 000 Hz at no more than 0.8%

total harmonic distortion.

Mid-range ±12 dB (500 Hz, 1 kHz, 1.5 kHz, 2.5 kHz)

Treble ±12 dB (7.5 kHz, 10 kHz, 12.5 kHz, 15 kHz)

Q (Q-slope) Q0.5 to Q2.0

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)

Frequency Response 40 Hz to 15 000 Hz

Stereo Separation 30 dB

Selectivity 35 dB

CD PLAYER SECTION

Max. Bit Rate 320 kbps

Installation Size 182 mm × 52 mm × 160 mm

Panel Size 187 mm

65 dB

GENERAL

58 mm × 6 mm

(No.MA376<Rev.002>)1-3

1.1 Safety Precautions

SECTION 1

PRECAUTION

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.

1-4 (No.MA376<Rev.002>)

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 laser products. 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 pickup unit.

• Apply solder to the short land before the card wire is disconnected from the connector on the pickup unit. (If the card wire is disconnected without applying solder, the pickup may be destroyed by static electricity.)

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

Pickup

Wires

Push switch

Base board

Frame

Flexible wire

Connector

CD mechanism assembly

Pickup

(No.MA376<Rev.002>)1-5

1.5 Important for laser products

1.CLASS 1 LASER PRODUCT

2.CAUTION :

(For U.S.A.) Visible and/or invisible class II laser radiation when open. Do not stare into beam. (Others) Visible and/or invisible class 1M laser radiation when open. Do not view directly with optical instruments.

3.CAUTION : Visible and/or invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure to beam.

4.CAUTION : This laser product uses visible and/or 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 and PRINT

WARNING LABEL and PRINT

1-6 (No.MA376<Rev.002>)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

SECTION 3

DISASSEMBLY

3.1 Main body (used figure is KD-AR390)

3.1.1 Removing the FRONT CHASSIS assembly (See Fig.1)

(1) Disengage the four hooks a engaged the both side of the

FRONT CHASSIS assembly.

hook a

Fig.1

3.1.2 Removing the HEAT SINK (See Fig.2, 3)

(1) Remove the three screws A and the two screws B attaching

the HEAT SINK. (See Fig.2)

(2) Remove the two screws C and the one screw D attaching

the HEAT SINK. (See Fig.3)

3.1.3 Removing the BOTTOM COVER (See Fig.4)

(1) Remove the one screw E attaching the BOTTOM COVER. (2) Slide the BOTTOM COVER to backward.

Fig.2

Fig.3

Fig.4

(No.MA376<Rev.002>)1-7

3.1.4 Removing the MAIN BOARD assembly (See Fig.5,6)

(1) Remove the two screws F and one screw G attaching the

MAIN BOARD assembly. (See Fig.5)

(2) Remove the two screws H attaching the MAIN BOARD assembly.

(See Fig.6)

(3) Disconnect the connector CN501

BOARD assembly and CD MECHANISM assembly. (See Fig.6)

connected to MAIN

Fig.5

CN501

3.1.5 Removing the CD MECHANISM assembly (See Fig.7)

(1) Remove the three screws J attaching the CD MECHANISM

assembly.

Fig.6

Fig.7

1-8 (No.MA376<Rev.002>)

3.1.6 Removing the SWITCH BOARD assembly (See Fig.8)

(1) Remove the VOLUME KNOB. (2) Remove the four screws K attaching the REAR COVER. (3) Disengage the nine hooks b engaged the REAR COVER.

3.2 CD MECHANISM assembly section

• Remove the CD MECHANISM assembly from the main body.

Removing the MECHANISM CONTROL BOARD

3.2.1

assembly (See Fig.

(1)

From the bottom side of CD MECHANISM assembly, remove the solders from the soldered sections (

) on the MECHANISM CONTROL BOARD assembly.

(See Fig.

(2) Remove the three screws A and one screw B attaching the

MECHANISM CONTROL BOARD assembly. (See Fig.1.)

(3) Solder the short land sections on the pickup. (See Fig.2.)

Caution:

• Solder the short land sections on the pickup before

•

disconnecting the flexible wire from the connector

on the MECHANISM CONTROL BOARD as-

CN102

sembly. If the card wire is disconnected without attaching solder, the pickup may be destroyed by static electricity. (See Fig. When attaching the MECHANISM CONTROL BOARD assembly, remove the solders from the short land sections after connecting the flexible wire to the connector CN102 CONTROL BOARD assembly.

and 2)

a, b

and

on the MECHANISM

Mechanism control board

hook

Fig.8

Fig.1

hook

CN102

Mechanism control board

CN102

Flexible wire

Short land section

Pickup

Fig.2

(No.MA376<Rev.002>)1-9

3.2.2 Removing the top cover (See Fig.3 to 5)

• Remove the MECHANISM CONTROL BOARD assembly. (1) From the front side of the CD MECHANISM assembly,

change the hook position of the two roller springs. (See Fig.3.)

(2) From the side of the CD MECHANISM assembly, remove

the six screws C attaching the top cover. (See Fig.3 and 4.)

(3) Take out the top cover in an upward direction. (See Fig.5.)

Top cover

Fig.5

Roller spring Roller spring

Fig.3

Top cover

Fig.4

1-10 (No.MA376<Rev.002>)

3.2.3 Removing the roller (See Fig.6)

• Remove the MECHANISM CONTROL BOARD assembly and top cover. (1) From the bottom side of the top cover, remove the screw D

attaching the gear holder.

(2) Remove the R.holder assembly from disc plate, and then

take out the roller from R.holder assembly in the direction of the arrow.

Reference:

When attaching the R.ACT gear (2) and R.ACT gear (3), apply grease to the section d of R.holder assembly.

Gear holder

Roller gear

R.ACT gear(3)

Roller coller

Washer

Roller

3.2.4 Removing the PHOTO BOARD assembly (See Fig.7 and 8)

• Remove the MECHANISM CONTROL BOARD assembly and top cover.

From the bottom side of the top cover, release the

(1)

projection

Fig.

(2) Take out the disc plate in the direction of the arrow. (See

Fig.7.)

(3) From the reverse side of the disc plate, remove the screw

E attaching the PHOTO BOARD assembly. (See Fig.8.)

from the notch of the disc plate. (See

R.ACT gear(2)

Top cover

R.holder assembly

Disc plate

Fig.6

Disc plate

Photo board

Fig.7

Disc plate

Fig.8

(No.MA376<Rev.002>)1-11

3.2.5 Removing the mechanism section (See Fig.9 and 10)

• Remove the MECHANISM CONTROL BOARD assembly and top cover. (1)

From the top side of the CD MECHANISM assembly,

remove the two screws assembly. (See Fig.

(2) Remove the two roller springs on the top side of the mecha

frame. (See Fig.9.)

(3) Remove the four SUS springs on the top side of the mecha

frame. (See Fig.9.)

(4) Remove the link spring on the top side of the mecha frame.

(See Fig.10.)

(5) Release section f of the three dampers from the mecha

frame. (See Fig.10.)

Reference:

When attaching the roller spring and SUS spring, keep direction before remove.

Move the slide cam (R) assembly in the direction of the

(6)

arrow, and then take out the mechanism section in an upward direction. (See Fig.10.)

Reference:

When attaching the mechanism section, apply grease to the section g. (See Fig.10.)

attaching the loading motor

SUS

spring

SUS

spring

Mechanism section

Mecha frame

Roller spring

Loading motor assembly

SUS

spring

SUS

spring

Damper

Fig.9

Mechanism section

Mecha frame

Slidecam(R) assembly

1-12 (No.MA376<Rev.002>)

Link spring

Fig.10

3.2.6 Removing the slide cam (L) (See Fig.11 to 13)

• Remove the MECHANISM CONTROL BOARD assembly, top cover and mechanism section. (1) From the top side of the mecha frame, remove the screw G

attaching the cam cover. (See Fig.11.) Take out the cam cover from mecha frame in an upward

(2)

Cam cover

direction. (See Fig.

(3) Take out the slide cam (L) in the direction of the arrow.

(See Fig.12.)

Reference:

When attaching the slide cam (L), apply grease to the section h. (See Fig.13.)

Slide cam(L)

Fig.13

Mecha frame

Slide cam(L)

Fig.11

Mecha frame

Fig.12

(No.MA376<Rev.002>)1-13

3.2.7 Removing the F.lock lever and slide cam (R) (See

Fig.14 and 15)

• Remove the MECHANISM CONTROL BOARD assembly, top cover and mechanism section. (1) From the top side of the mecha frame, take out the slide

cam (R) assembly in an upward direction. (See Fig.14.)

(2) Rotate the F.lock lever in the direction of the arrow 1, and

then take out the direction of the arrow 2. (See Fig.14.)

Reference:

When attaching the slide cam (R) assembly, the f.lock lever and the link arm apply grease to the section

(See Fig.

and 15.)

Slide cam(R) assembly

F.lock lever

Mecha frame

Fig.14

Link arm

Slide cam(R) assembly

3.2.8 Removing the damper (See Fig.16)

• Remove the MECHANISM CONTROL BOARD assembly, top cover and mechanism section. From the mechanism section, pull out the three dampers in the direction of the arrow.

Reference:

Before inserting the shaft to the dampers, apply IPA to the pocket j of damper.

Slide cam(R) assembly

Fig.15

Damper (Gray)

Damper (Brown)

1-14 (No.MA376<Rev.002>)

Damper (Brown)

Fig.16

3.2.9 Removing the clamper assembly (See Fig.17)

• Remove the MECHANISM CONTROL BOARD assembly, top cover and mechanism section. (1) From the top side of the mechanism section, release the

clamper spring.

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

and then release the joints (k and m). Take out the clamper assembly from the T.M chassis

(3)

assembly.

Clamper assembly

Clamper spring

T.M. chassis assembly

Fig.17

(No.MA376<Rev.002>)1-15

3.2.10 Removing the feed motor (See Fig.18 and 19)

• Remove the MECHANISM CONTROL BOARD assembly, top cover, mechanism section and clamper assembly. (1) From the bottom side of the T.M chassis assembly, remove

the two screws H attaching the feed motor assembly. (See Fig.18.) Remove the two screws J attaching the feed motor to

(2)

f.motor holder. (See Fig.

Reference:

When attaching the f. wheel gear, trigger arm and feed motor, apply grease to the sections (n, p and q). (See Fig.18 and 19.)

3.2.11 Removing the SWITCH BOARD assembly (See

Fig.18)

• Remove the MECHANISM CONTROL BOARD assembly, top cover, mechanism section, clamper assembly and feed motor assembly. From the bottom side of the T.M chassis assembly, take out the SWITCH BOARD assembly in an upward direction from T.M chassis assembly.

Feed motor assembly

Switch board

F.wheel gear

Trigger arm

3.2.12 Removing the loading motor (See Fig.20)

• Remove the MECHANISM CONTROL BOARD assembly, top cover, mechanism section and clamper assembly. (1) From the right side of the L.M base assembly, remove the

two screws K attaching the loading motor.

(2) Take out the loading motor in the direction of the arrow

from the L.M base assembly.

Reference:

When attaching the loading motor, apply grease to the section r.

T.M. chassis assembly

Feed motor

F.worm gear

L.M. base assembly

Fig.18

Comp. spring

F.motor holder

Fig.19

L.worm gear

Loading moto

1-16 (No.MA376<Rev.002>)

Fig.20

+ 35 hidden pages