JVC KS-LH60R Bedienungsanleitung

SERVICE MANUAL

2003/6

CASSETTE RECEIVER

4985520036KS-LH60R

TABLE OF CONTENTS

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

2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20

5 TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24

6 DESCRIPTION OF MAJOR ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25

SOUND

VOL VOL

SOURCE

ATT

Area Suffix

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

1-2 (No.49855)

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 Ω40 Hz to 20 000 Hz

at no more than 0.8% total harmonic distortion.

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 ±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 (250 nWb/m)

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 ΩV/75 Ω)

50 dB Quieting Sensitivity 16.3 dBf (1.8 ΩV/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] Sensitivity 50 µV

CASSETTE DECK SECTION Wow & Flutter 0.11% (WRMS)

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

Frequency Response (Dolby B NR OFF) 30 Hz to 16 000 Hz (Normal tape)

Signal-to-Noise Ratio 56 dB (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 0ºC to +40ºC

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

Panel Size (approx.) 188 mm ×58 mm ×12 mm

Mass (approx.) 1.5 kg (excluding accessories)

(No.49855)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.

1-4 (No.49855)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SEVICE INSTRUCTIONS.

(No.49855)1-5

SECTION 3

DISASSEMBLY

3.1 Main body

3.1.1 Removing the front panel assembly

(See Fig.1)

(1) Press the release button and remove the front panel as-

sembly.

Fig.1

3.1.2 Removing the bottom cover

(See Fig.2)

• Prior to performing the following procedures, remove the front

panel assembly.

(1) Turn the main body upside 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.

CAUTION:

When releasing the joints using a screwdriver, do not damage

the main board.

Fig.2

3.1.3 Removing the front chassis assembly

(See Figs.3 and 4)

• 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. (See Fig.3.)

(2) Remove the two screws Bon the front side of the main

body. (See Fig.4.)

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

of the main body, then remove the front chassis assembly

toward the front. (See Fig.3.)

Fig.3

Fig.4

Release button

Front panel assembly

Bottom cover

Joint a

Joint b

Joint a

Joint b

Joint c

Joint d

Joint dFront chassis assembly

Joint e

Front chassis assembly

1-6 (No.49855)

3.1.4 Removing the heat sink

(See Fig.5)

• Prior to performing the following procedure, remove the front

panel assembly.

(1) Remove the two screws Cand screw Dattaching the heat

sink on the left side of the main body, and remove the heat

sink.

Fig.5

3.1.5 Removing the rear panel

(See Fig.6)

• Prior to performing the following procedure, remove the front

panel assembly and bottom cover.

(1) Remove the two screws E, one screws Fand three screws

Gattaching the rear panel on the back side of the main

body.

Reference:

During reassembly, before fixing the rear bracket onto the

main body, insert the STEERING cable into the slot.

Fig.6

3.1.6 Removing the main board

(See Fig.7)

• Prior to performing the following procedures, remove the front

panel assembly, bottom cover, front chassis assembly, heat

sink and rear panel.

(1) Remove the two screws Hattaching the main board on the

top chassis.

(2) Disconnect the connector CP401 on the main board from

the cassette mechanism assembly.

Fig.7

DHeat sink

Rear bracket

Insert steering cables into the slots.

Main board

CP401

(No.49855)1-7

3.1.7 Removing the cassette mechanism assembly

(See Fig.8)

• Prior to performing the following procedures, remove the front

panel assembly, bottom cover, front chassis assembly, heat

sink, rear panel and main board.

(1) Disconnect the wire from the connector CN402 on the

mecha board.

(2) Disconnect the card wire from the connector CN403 on the

mecha board.

(3) Remove the four screws Jattaching the cassette mecha-

nism assembly to the top chassis, take out the cassette

mechanism assembly.

Fig.8

3.1.8 Removing the mecha board

(See Fig.9)

• Prior to performing the following procedures, remove the front

panel assembly, bottom cover, front chassis assembly, heat

sink, rear panel and main board.

(1) Disconnect the wire from the connector CN402 on the

mecha board.

(2) Disconnect the card wire from the connector CN403 on the

mecha board.

(3) Remove the screw Kattaching the mecha board.

(4) Bend the hook fin the direction of the arrow 1 and move

the mecha board in the direction of the arrow 2.

(5) Remove the mecha board from the mecha bracket (L) of

the top chassis.

Fig.9

J J

Top chassis

Cassette mechanism assembly

CN402

CN401 CN403

Mecha board hook f

1-8 (No.49855)

3.1.9 Removing the front board

(See Figs.10 to 12)

• Prior to performing the following procedures, remove the front

panel assembly.

(1) Remove the four screws Lattaching the rear cover on the

back side of the front panel assembly. (See Fig.10.)

(2) Release the nine joints g, the front panel assembly and

rear cover become separate. (See Fig.11.)

(3) Remove the front board from the front panel assembly.

(See Fig.12.)

Fig.10

Fig.11

Fig.12

Rear cover

Joints g

Joint g

Rear cover

Front panel assembly

Front board Front panel assembly

(No.49855)1-9

3.2 Cassette mechanism assembly

REFERENCE:

Prior to performing the following procedures, turn the mode

gear on the bottom of the body until the respective part comes

to the EJECT position (Refer to Fig.1).

Fig.1

3.2.1 Removing the cassette guide

(See Fig.2)

(1) Turn the mode gear to set to RVS play or subsequent

mode.

(2) Remove the cassette guide from the main chassis while re-

leasing each two joint tabs ain the direction of the arrow.

Fig.2

3.2.2 Removing the load arm

(See Fig.3)

(1) Remove the E-washer attaching the load arm.

(2) Move the load arm in the direction of the arrow and release

the joint bon the cassette catch.

Fig.3

Mode gea

Cassette guide

Tab a

Load arm

E-washer

Joint b

1-10 (No.49855)

3.2.3 Removing the cassette hanger assembly / cassette holder

(See Fig.4 to 7)

(1) Check the mode is set to EJECT. Push down the front part

of the cassette holder and move in the direction of the ar-

row to release the joint c.

(2) Move the rear part of the cassette hanger assembly in the

direction of the arrow to release it from the two joint bosses

(3) Release the holder stabilizer spring from the hooks eand

f, then pull out from the cassette hanger assembly.

(4) Bring up the rear side of the cassette hanger assembly to

release the joint gand h.

(5) Pull out the cassette catch from the cassette hanger as-

sembly.

Fig.4

Fig.5

Fig.6

Fig.7

Cassette holder assembly

Side bracket

Joints c

Cassette holder assembly

Cassette hanger

assembly

Boss d

Cassette hange

assembly

Cassette stabilizer spring

Hook f

Hook e

Cassette hanger

assembly

Hook h

Hook g

Cassette holder

assembly

Cassette holder assembly

Cassette hanger assembly

Cassette catch

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