JVC CD/Cassette Receiver KW-XC939 Bedienungsanleitung

SERVICE MANUAL

2003/10

CD / CASSETTE RECEIVER

MA041200310 KW-XC939

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

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

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

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-37

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-41

Area suffix

EE --------- Russian Federation

1-2 (No.MA041)

SPECIFICATION

Design and specifications are subject to change without notice.

AUDIO AMPLIFIER SECTION

Maximum Power Output Front 45 W per channel

Rear 45 W per channel

Continuous Power Output (RMS) Front 17 W per channel into 4 Ω40 Hz to 20 000 Hz at no more than 0.8%

total harmonic distortion.

Rear 17 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 to 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

Auxiliary input jack 3.5 mm dia. stereo mini jack

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 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

Capture Ratio 1.5 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

CASSETTE DECK SECTION

Wow and Flutter 0.1 % (WRMS)

Fast-Wind Time 100 sec. (C-60)

Frequency Response 30 Hz to 16 000 Hz (Normal tape)

Signal-to-Noise Ratio (Normal tape)

Dolby B NR ON 65 dB

Dolby B NR OFF 56 dB

Stereo Separation 40 dB

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 178 mm ×100 mm ×150 mm

Front Panel Size 170 mm ×96 mm ×20 mm

Mass 2.2 kg (excluding accessories)

(No.MA041)1-3

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.

1-4 (No.MA041)

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 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.

(caption)

Anti-static wrist strap

Conductive material

(conductive sheet) or iron plate

Pickup

Short-circuit point

(Soldering)

Flexible wire

Pickup

Short-circuit point

(No.MA041)1-5

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-6 (No.MA041)

SECTION 3

DISASSEMBLY

3.1 Main body

3.1.1 Removing the front panel assembly

(See Fig.1, 2)

(1) From thebothside of themainbody,remove thefourscrews

Aattaching the front panel assembly. (See Figs.1, 2)

(2) Release the four joints ausing a screwdriver, then remove

the front panel assembly toward the front. (See Figs.1, 2)

Fig.1

Fig.2

3.1.2 Removing the rear bracket

(See Figs.3)

• Prior to performing the following procedure, remove the front

panel assembly as required.

(1) From the back side of the main body, remove the ten

screws B, screw Cand screw Dattaching the rear bracket.

(2) Take out the rear bracket.

Fig.3

3.1.3 Removing the heat sink

(See Fig.4)

• Prior to performing the following procedure, remove the front

panel assembly as required.

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

Eand three screws Fattaching the heat sink.

Fig.4

Front panel assembly

Joints a

Front panel assembly

Rear braket

FFE

Heat sink

(No.MA041)1-7

3.1.4 Removing the top chassis assembly and bottom

chassis assembly

(See Fig.5 to 7)

• Prior to performing the following procedures, remove the front

panel assembly, rear bracket and heat sink.

(1) From the back side of the main body, disconnect the card

wire from the connector CN702 on the main board in the

top chassis assembly. (See Fig.5)

(2) From the both side of the main body, remove the three

screws Gattaching the bottom chassis assembly. (See

Figs.6, 7)

(3) Release the four joints busing a screwdriver, and then re-

move the top chassis assembly upward from the bottom

chassis assembly. (See Figs.6, 7) Fig.5

Fig.6

Fig.7

3.1.5 Removing the main board

(See Fig.8)

• Prior to performing the following procedures, remove the front

panel assembly, rear bracket, heat sink, top chassis assembly

and bottom chassis assembly.

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

the three screws Hattaching the main board.

(2) Disconnect the connector CN501 on the main board, and

take out the main board from the top chassis assembly.

Reference:

• When attaching the main board, joint the hole of the main

board in joint cof the top chassis assembly.

Fig.8

CN702

Card wire Main board

Top chassis assembly

Bottom chassis assembly

Joints b

Top chassis assembly

Bottom chassis assembly

Joints b

CN601

Main board

Top chassis assembly

Joints c

1-8 (No.MA041)

3.1.6 Removing the CD mecha control board

(See Fig.9)

• Prior to performing the following procedures, remove the front

panel assembly, rear bracket, heat sink, top chassis assembly

and main board.

(1) From the top side of top chassis assembly, disconnect the

card wire from the connector CN601 on the CD mecha con-

trol board.

(2) Remove the five screws Jattaching the CD mecha control

board, and release the joint dand joint efrom the top chas-

sis assembly.

Fig.9

3.1.7 Removing the CD mechanism assembly

(See Fig.10)

• Prior to performing the following procedures, remove the front

panel assembly, rear bracket, heat sink, top chassis assembly,

main board and CD mecha control board.

(1) Remove the three screws Kattaching the CD mechanism

assembly to the top chassis assembly.

Reference:

• When attaching the CD mechanism assembly, joint the hole

of the CD mechanism assembly in boss fand boss gof the

top chassis assembly.

Fig.10

CD mecha control board

Joint d

Joint e

Top chassis assembly

CN601

Card

wire

CD mechanism assembly

Boss gBoss f

Top chassis assembly

(No.MA041)1-9

3.1.8 Removing the changer control board

(See Fig.11, 12)

• Prior to performing the following procedures, remove the front

panel assembly, rear bracket, heat sink, top chassis assembly

and bottom chassis assembly.

(1) m the connector CN972 on the changer control board. (See

Fig.11)

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

the two screws Lattaching the changer control board. (See

Fig.12)

Reference:

• When attaching the changer control board, joint the hole of

the changer control board in joints hof the bottom chassis

assembly.

Fig.11

Fig.12

3.1.9 Removing the mecha control board

(See Fig.13)

• Prior to performing the following procedures, remove the front

panel assembly, rear bracket, heat sink, bottom chassis as-

sembly and changer control board.

(1) From the back side of the bottom chassis assembly, re-

move the screw Mattaching the mecha control board, and

release the joints ifrom the bottom chassis assembly.

(2) Disconnect the wire from the connector CN402 and the

card wire from the connector CN403 on the mecha control

board.

Reference:

• When attaching the mecha control board, joint the hole of

the mecha control board in joints iof the bottom chassis as-

sembly.

Fig.13

CN972

Card wire

Changer control board

Bottom chassis assembly

Changer control board

Bottom chassis assembly

Joint h

Cassette mechanism assembly

Top chassis assembly Mecha control board

Joint i

CN403CN402

1-10 (No.MA041)

3.1.10 Removing the cassette mechanism assembly

(See Fig.14)

• Prior to performing the following procedures, remove the front

panel assembly, rear bracket, heat sink, bottom chassis as-

sembly, changer control board and mecha control board.

(1) From the bottom side of the bottom chassis assembly, re-

move the four screws Nattaching the cassette mechanism

assembly to the bottom chassis assembly.

Fig.14

3.1.11 Removing the LCD board

(See Fig.15)

• Prior to performing the following procedures, remove the front

panel assembly.

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

twelve screws Pattaching the LCD board, and then turn

over the LCD board.

(2) From the reverse side of LCD board, remove the solders

from the soldered points jattaching the wire.

Fig.15

3.1.12 Removing the switch board

(See Fig.16)

• Prior to performing the following procedures, remove the front

panel assembly.

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

five screws Qattaching the switch board.

(2) Release the claws kattaching the switch board, and then

turn over the switch board.

(3) From the reverse side of switch board, remove the solders

from the soldered points mattaching the wire.

Fig.16

Cassette mechanism assembly

Bottom chassis assembly

Front panel assembly

LCD board Solder points j

Front panel assembly

Switch board

Claws k

Solder points m

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