JVC KD-AR960, KD-LH910 Service Manual

SERVICE MANUAL

CD/SD RECEIVER

MA14220052

KD-AR960,KD-LH910

Area suffix

J --------------- Northern America

KD-AR960 KD-LH910

ARSENAL rogo

LINE IN

 

TABLE OF CONTENTS

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

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

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

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26

No.MA142

2005/2

SPECIFICATION

AUDIO AMPLIFIER SECTION

Power Output 20 W RMS × 4 Channels at 4 Ω and Signal to Noise Ratio 80 dBA (reference: 1 W into 4 Ω) Load Impedance 4 Ω (4 Ω to 8 Ω allowance)

Equalizer Control Range Low ±12 dB (60 Hz, 80 Hz, 100 Hz, 120 Hz)

Mid ±12 dB (Fix)

High ±12 dB (8 kHz, 10 kHz, 12 kHz, 15 kHz)

Frequency Response 40 Hz to 20 000 Hz

Line-In Level/Impedance KD-AR960 1.5 V/20 kΩ load Line-Out Level/Impedance KD-AR960 5.0 V/20 kΩ load (full scale)

KD-LH910 4.0 V/20 kΩ load (full scale) Output Impedance 1 kΩ Subwoofer-Out Level/Impedance 2.0 V/20 kΩ load (full scale)

Other Terminals CD changer, LINE IN (for KD-AR960)

TUNER SECTION

Frequency Range FM 87.5 MHz to 107.9 MHz (with channel interval set to 200 kHz)

87.5 MHz to 108.0 MHz (with channel interval set to 50 kHz)

AM 530 kHz to 1 710 kHz (with channel interval set to 10 kHz)

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

Capture Ratio 1.5 dB

AM Tuner Sensitivity 20 µV

Selectivity 35 dB

CD/SD 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 (MPEG1/2 Audio Layer 3) Max. Bit Rate: 320 kbps

WMA (Windows Media Audio) Max. Bit Rate: 192 kbps

Playable SD Card Format Fat 12/16

Storage Up to 512 MB

Playable Audio Format for SD Card MP3/WMA

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 × H × D) Installation Size (approx.) 182 mm × 52 mm × 159 mm (7-3/16" × 2-1/16" × 6-5/16")

Panel Size (approx.) 188 mm × 58 mm × 12 mm (7-7/16" × 2-5/16" × 1/2")

Mass (approx.) 1.7 kg (3.8 lbs) (excluding accessories)

[< or =] 1% THD+N

Design and specifications are subject to change without notice.

1-2 (No.MA142)

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.MA142)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.

CD mechanism assembly

Flexible wire

1-4 (No.MA142)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MA142)1-5

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) Take out 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 two screws B attaching the heat sink.

(2) Take out the heat sink.

Front panel assembly

Detach button

Fig.1

AAB

Heat sink

Fig.2

1-6 (No.MA142)

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 back 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) From the left side of the main body, remove the screw E at-

taching the top chassis assembly. (See Fig.5)

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

and disconnect the connector CN501 nism assembly from the connector CN702 board. (See Figs.5 and 6)

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

assembly.

on the CD mecha-

on the main

Bottom chassis assembly

Top chassis assembly

Fig.3

Top chassis assembly

Bottom chassis assembly

Top chassis assembly

Main board

Bottom chassis assembly

Fig.4

CD mechanism assembly

CN702

Fig.5

Top chassis assembly

CN501

Bottom chassis assembly

Rear bracket

Fig.6

(No.MA142)1-7

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 F attaching the front chassis. (See Figs.7 and 8)

(2) Take out the front chassis forward.

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.

Reference:

Remove the front chassis as required. (1) From the inside of the top chassis assembly, remove the

three screws G attaching the CD mechanism assembly.

Reference:

When attaching the screw G, attach it with the mecha heat sink.

(2) Remove the mecha heat sink from the CD mechanism as-

sembly, and take out the CD mechanism assembly from the top chassis.

Reference:

When attaching the mecha heat sink, pass the craws of it through the slots a of CD mechanism assembly.

Top chassis assembly

Front chassis

Top chassis

Slots a

Front chassis

Fig.7

Top chassis assembly

Fig.8

Mecha heat sink

1-8 (No.MA142)

G GCD mechanism assembly

Fig.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 back side of the bottom chassis assembly, re-

move the two screws H 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 J 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 connector CN951

board. (See Fig.11)

Reference:

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

(6) Take out the main board with the rear bracket from the bot-

tom chassis assembly.

. (See Fig.11)

on the main

Front door mechanism assembly

Connector

Card wire

Bottom chassis assembly

Fig.10

Bottom chassis assembly

CN701

Stopper

Rear bracket

Main board

CN951

Fig.11

Wire clamps

(No.MA142)1-9

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 back side of the main board, remove the wires

from the rear bracket in the direction of the arrow.

(2) Remove the screw K, three screws L and screw M attach-

ing 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.

(3) Take out the rear bracket from the main board.

Wire

Wire (KD-AR960)

Rear bracket

Main board

Wire holder

Slots

Rear bracket

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 N attaching the FPC guide to the bottom chassis.

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

nism assembly to the bottom chassis.

Reference:

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

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

tom chassis.

Bottom chassis

L K

Front door mechanism assembly

FPC guide

Fig.12

1-10 (No.MA142)

Fig.13

+ 22 hidden pages