JVC KD-AR390J Bedienungsanleitung

SERVICE MANUAL

2008/5

CD RECEIVER

MA376<Rev.002>20085SERVICE MANUAL KD-AR390J, KD-G340J,

KD-G444UI, KD-G445U,

KD-G445UN, KD-G445UT,

KD-G445UH, KD-G446U,

KD-G446UN, KD-G446UT,

KD-G446UH, KD-S25J

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

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

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

SPECIFICATION

KD-AR390/KD-G340/KD-S25

Design and specifications are subject to change without notice.

AUDIO AMPLIFIER SECTION

Power Output 20 W RMS ×4 Channels at 4 Ωand < or = 1% THD+N

Signal-to-Noise Ratio 80 dBA (reference: 1 W into 4 Ω)

Load Impedance 4 Ω(4 Ωto 8 Ωallowance)

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 kΩload (full scale)

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

Subwoofer-Out Level/Impedance

KD-AR390 5.0 V /20 kΩload (full scale)

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

Output Impedance 1 kΩ

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

input (only for KD-AR390) Antenna

TUNER SECTION

Frequency Range FM

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

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 35 dB

AM Tuner Sensitivity 20 µV

Selectivity 35 dB

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 96 dB

Signal-to-Noise Ratio 98 dB

Wow and Flutter Less than measurable limit

MP3 Decoding Format

(MPEG1/2 Audio Layer 3)

Max. Bit Rate 320 kbps

WMA (Windows Media® Audio)

Decoding Format

Max. Bit Rate 192 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 (32°F to 104°F)

Dimensions (W

D) (approx.)

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”)

Mass 1.3 kg (2.9 lbs) (excluding accessories)

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

KD-G444/KD-G445/KD-G446

Design and specifications are subject to change without notice.

AUDIO AMPLIFIER SECTION

Maximum Power Output Front/Rear 50 W per channel

Continuous Power Output (RMS)

Front/Rear 19 W per channel into 4 Ω40 Hz to 20 000 Hz at no more than 0.8%

total harmonic distortion.

Load Impedance 4 Ω(4 Ωto 8 Ωallowance)

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

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

Frequency Response 40 Hz to 20 000 Hz

Signal-to-Noise Ratio 70 dB

Line-Out Level/Impedance 2.5 V/20 kΩload (full scale)

Subwoofer-Out Level/Impedance 2.5 V/20 kΩload (full scale)

Output Impedance 1kΩ

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

TUNER SECTION

Frequency Range FM 87.5 MHz to 108.0 MHz

AM 531 kHz to 1 602 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

AM Tuner Sensitivity 20 µV

Selectivity 35 dB

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 96 dB

Signal-to-Noise Ratio 98 dB

Wow and Flutter Less than measurable limit

MP3 Decoding Format

(MPEG1/2 Audio Layer 3)

Max. Bit Rate 320 kbps

WMA (Windows Media® Audio)

Decoding Format

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

D) (approx.)

Installation Size 182 mm

52 mm

160 mm

Panel Size 187 mm

58 mm

6 mm

Mass 1.3 kg (excluding accessories)

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

SECTION 1

PRECAUTION

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.

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

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.

(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.

(caption)

Anti-static wrist strap

Conductive material

(conductive sheet) or iron plate

Wires Push switch

Pickup

Base board

Pickup

Connector

Flexible wire

Frame CD mechanism

assembly

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

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.

REPRODUCTION AND POSITION OF LABELS and PRINT

!Please use enough caution not to

see the beam directly or touch it

in case of an adjustment or operation

check.

WARNING LABEL and PRINT

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

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 aengaged the both side of the

FRONT CHASSIS assembly.

Fig.1

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

(1) Remove the three screws Aand the two screws Battaching

the HEAT SINK. (See Fig.2)

(2) Remove the two screws Cand the one screw Dattaching

the HEAT SINK. (See Fig.3)

Fig.2

Fig.3

3.1.3 Removing the BOTTOM COVER (See Fig.4)

(1) Remove the one screw Eattaching the BOTTOM COVER.

(2) Slide the BOTTOM COVER to backward.

Fig.4

hook a

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

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

(1) Remove the two screws Fand one screw Gattaching the

MAIN BOARD assembly. (See Fig.5)

(2) Remove the two screws Hattaching the MAIN BOARD assembly.

(See Fig.6)

(3) Disconnect the connector CN501 connected to MAIN

BOARD assembly and CD MECHANISM assembly. (See

Fig.6)

Fig.5

Fig.6

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

(1) Remove the three screws Jattaching the CD MECHANISM

assembly.

Fig.7

CN501

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

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

(1) Remove the VOLUME KNOB.

(2) Remove the four screws Kattaching the REAR COVER.

(3) Disengage the nine hooks bengaged the REAR COVER.

Fig.8

3.2 CD MECHANISM assembly section

• Remove the CD MECHANISM assembly from the main body.

3.2.1

Removing the MECHANISM CONTROL BOARD

assembly (See Fig.

and

)

(1)

From the bottom side of CD MECHANISM assembly,

remove the solders from the soldered sections (

and

) on the MECHANISM CONTROL BOARD assembly.

(See Fig.

(2) Remove the three screws Aand one screw Battaching 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

CN102 on the MECHANISM CONTROL BOARD as-

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 on the MECHANISM

CONTROL BOARD assembly.

Fig.1

Fig.2

hook b

CN102

Mechanism

control board

Mechanism control board

CN102

Pickup

Flexible wire

Short land section

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

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 Cattaching the top cover. (See Fig.3 and 4.)

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

Fig.3

Fig.4

Fig.5

Top cover

Roller spring Roller spring

Top cover

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