JVC KD-G401 Bedienungsanleitung

SERVICE MANUAL

2004/1

CD RECEIVER

MA05120041KD-G401

TABLE OF CONTENTS

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

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

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

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25

Area suffix

E ----------- Continental Europe

EX --------------- Central Europe

KD-G401

1-2 (No.MA051)

SPECIFICATION

Design and specifications are subject to change without notice.

AUDIO AMPLIFIER SECTION

Maximum Power Output Front 50 W per channel

Rear 50 W per channel

Continuous Power Output

(RMS) 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.

Load Impedance 4 Ω(4 Ωto 8 Ωallowance)

Tone Control Range Bass ±10 dB at 100 Hz

Treble ±10 dB at 10 kHz

Frequency Response 40 Hz to 20 000 Hz

Signal-to-Noise Ratio 70 dB

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 (MW) 522 kHz to 1 620 kHz

(LW) 144 kHz to 279 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

Capture Ratio 1.5 dB

[MW Tuner] Sensitivity 20 µV

Selectivity 35 dB

[LW Tuner] Selectivity 50 µV

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 MPEG 1/2 Audio Layer 3

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 0ºC to +40ºC

Dimensions (W ×H ×D) Installation Size (approx.) 182 mm ×52 mm ×150 mm

Panel Size (approx.) 188 mm ×58 mm ×11 mm

Mass (approx.) 1.3 kg (excluding accessories)

1-6 (No.MA051)

SECTION 3

DISASSEMBLY

3.1 Main body

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 and remove the front panel assembly.

Fig.1

3.1.2 Removing the bottom cover

(See Fig.2)

(1) Turn the main body up side down.

(2) Insert a screwdriver under the joints to release the two

joints aon the left side, two joints bon the right side and

joint con the back side of the main body, then remove the

bottom cover from the main body.

Note:

When releasing the joints using a screwdriver, do not damage

the main board.

Fig.2

3.1.3 Removing the front chassis assembly

(See Fig.3)

• Prior to performing the following procedures, remove the front

panel assembly and bottom cover.

(1) Remove the two screws Aon the both sides of the main

body.

(2) Release the two joints dand two joints eon the both sides

of the main body, then remove the front chassis assembly

toward the front.

Fig.3

Front panel assembly

Detach button

Bottom cover

Joint b

Joint c

Joint a

Joint d

Front chassis assembly

Joint e

Joint d Joint e

(No.MA051)1-7

3.1.4 Removing the side panel

(See Fig.4)

• Prior to performing the following procedure, remove the front

panel assembly as required.

(1) Remove the screw Band two screws Cattaching the side

panel on the left side of the main body, and remove the side

panel.

Fig.4

3.1.5 Removing the rear bracket

(See Fig.5)

• Prior to performing the following procedure, remove the bottom

cover.

(1) Remove the three screws D, two screws Eand screw F

attaching the rear bracket on the back side of the main

body.

(2) Remove the rear bracket.

Reference:

Insert the STEERING cable into the slot before attaching the

rear bracket to the main body.

3.1.6 Removing the main board

(See Figs.5 and 6)

• Prior to performing the following procedures, remove the front

panel assembly, bottom cover and side panel.

• Remove the front chassis assembly as required.

(1) Remove the three screws Dattaching the rear bracket on

the back side of the main body. (See Fig.5.)

(2) Remove the two screws Gattaching the main board. (See

Fig.6.)

(3) Disconnect the connector CN501 on the main board from

the main body and take out the main board with the rear

bracket. (See Fig.6.)

Reference:

Remove the rear bracket from the main body as required. (See

“3.1.5 Removing the rear bracket”.)

Fig.5

Fig.6

Side panel

CBC

Rear bracket

Insert STEERING cable into the slot.

Main board

CN501

Rear bracket

1-8 (No.MA051)

3.1.7 Removing the CD mechanism assembly

(See Fig. 7)

• Prior to performing the following procedure, remove the front

panel assembly, bottom cover, side panel, rear bracket and

main board.

• Remove the front chassis assembly as required.

(1) Remove the three screws Hattaching the CD mechanism

assembly on the top chassis.

(2) Take out the CD mechanism assembly.

Fig.7

3.1.8 Removing the front board

(See Figs.8 to 10)

• Prior to performing the following procedures, remove the front

panel assembly.

(1) Remove the four screws Jon the back side of the front

panel assembly. (See Fig.8.)

(2) Release the ten joints fand remove the rear cover. (See

Fig.9.)

(3) Release the joint gand take out the front board from the

front panel assembly. (See Fig.10.)

Fig.8

Fig.9

Fig.10

CD mechanism assembly Top chassis

Joints f

Joint fJoints f

Joints fJoint f

Rear cover

Front board Joint g Front panel assembly

(No.MA051)1-9

3.2 CD Mechanism Assembly

3.2.1 Removing the top cover

(See Figs.1 and 2)

(1) Remove the two screws Aon the both side of the body.

(2) Lift the front side of the top cover and move the top cover

backward to release the two joints a.

Fig.1

Fig.2

Joints a

Top cover

Joints a

Top cover

1-10 (No.MA051)

3.2.2 Removing the connector board

(See Figs.3 to 5)

CAUTION:

Before disconnecting the flexible wire from the pickup, solder

the short-circuit point on the pickup. No observance of this in-

struction may cause damage of the pickup.

(1) Remove the screw Bfixing the connector board.

(2) Solder the short-circuit point on the connector board.

(3) Disconnect the flexible wire from the pickup.

(4) Move the connector board in the direction of the arrow to

release the two joints b.

(5) Unsolder the wire on the connector board if necessary.

CAUTION:

Unsolder the short-circuit point after reassembling.

Fig.3

Fig.4

Fig.5

Connector board

Pickup

Short-circuit point

Joints b

Wires

Pickup

Short-circuit point

(Soldering)

Flexible wire

Connector board

Frame

(No.MA051)1-11

3.2.3 Removing the DET switch

(See Figs.6 and 7)

(1) Extend the two tabs cof the feed sw. holder and pull out

the switch.

(2) Unsolder the DET switch wire if necessary.

Fig.6

Fig.7

Connector

board

DET switch

Pickup

DET switch Tab c

Tab c

DET switch wire

Feed sw. holder

1-12 (No.MA051)

3.2.4 Removing the chassis unit

(See Figs.8 and 9)

• Prior to performing the following procedure, remove the top

cover and connector board.

(1) Remove the two suspension springs (L) and (R) attaching

the chassis unit to the frame.

CAUTION:

• The shape of the suspension spring (L) and (R) are dif-

ferent. Handle them with care.

• When reassembling, make sure that the three shafts

on the underside of the chassis unit are inserted to the

dampers certainly.

Fig.8

Fig.9

Suspension spring (L)

Suspension spring (R)

Chassis unit

Frame

Chassis unit

Frame

Shafts

Shaft

Dampe

Damper

(No.MA051)1-13

3.2.5 Removing the clamper assembly

(See Figs.10 and 11)

• Prior to performing the following procedure, remove the top

cover.

(1) Remove the clamper arm spring.

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

release the two joints d.

Fig.10

Fig.11

Clamper arm

spring

Chassis rivet

assembly

Joint d

Joint d Clamper assembly

Clamper arm spring

Clamper

assembly

Joint d

Chassis rivet assembly

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