JVC KS-FX621 Manuale utente

SERVICE MANUAL

2003/03

KS-FX621

CASSETTE RECEIVER

49825200303 KS-FX621

TABLE OF CONTENTS

1 Safety precaution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

3 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17

4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21

RND

1097 8

Area Suffix

U ------ Other Areas

KS-FX621

1-2 (No.49825)

SECTION 1

Safety precaution

CAUTION

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.

KS-FX621

(No.49825)1-3

SECTION 2

Disassembly method

2.1 Main body

2.1.1 Removing the front panel assembly

(See Fig.1)

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

sembly.

Fig.1

2.1.2 Removing the bottom cover

(See Fig.2)

• Prior to performing the following procedure, remove the front

panel assembly.

(1) Turn the body upside down.

(2) Insert ascrewdriver under the joints to release the two

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

the joint con the back of the body, then remove the bottom

cover from the body.

CAUTION:

When releasing the joint cusing a screwdriver, do not damage

the main board.

Fig.2

2.1.3 Removing the front chassis

(See Fig.3)

• Prior to performing the following procedure, remove the front

panel assembly and bottom cover.

(1) Remove the screw Aon each side of the body.

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

then remove the front chassis toward the front.

Fig.3

Front panel assembly

Release button

Bottom cover

Joint b

Joint a

Joint c

Joint a

Joint dJoint e

Front chassis

Joint d

Joint e

KS-FX621

1-4 (No.49825)

2.1.4 Removing the heat sink

(See Fig.4)

• Prior to performing the following procedure, remove the front

panel assembly.

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

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

sink.

Fig.4

2.1.5 Removing the rear panel

(See Fig.5)

• Prior to performing the following procedure, remove the front

panel assembly and bottom cover.

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

screws Fattaching the rear panel on the back of the body.

Fig.5

2.1.6 Removing the main board

(See Fig.6)

• Prior to performing the following procedure, remove the front

panel assembly, bottom cover, front chassis, heat sink and

rear panel.

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

top chassis.

(2) Disconnect the connectors CP701 on the main board from

the cassette mechanism assembly.

Fig.6

Heat sink

CB C

EFF

DRear panel

Main board assembly

CP701

KS-FX621

(No.49825)1-5

2.1.7 Removing the cassette mechanism assembly

(See Fig.7)

• Prior to performing the following procedure, remove the front

panel assembly, bottom cover, front chassis, heat sink, rear

panel and main board.

(1) Remove the four screws Hattaching the cassette mecha-

nism assembly from the top chassis.

Fig.7

2.1.8 Removing the mecha board

(See Fig.8)

• Prior to performing the following procedure, remove the front

panel assembly, bottom cover, front chassis, heat sink, rear

panel, main board and cassette mechanism assembly.

(1) Disconnect the wire from the connectors CN402 and

CN403 on the mecha board.

(2) Remove the screw Jattaching the mecha board.

Fig.8

2.1.9 Removing the front board

(See Figs.9 to 11)

• Prior to performing the following procedure, remove the front

panel assembly.

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

back of the front panel assembly. (See fig.9)

(2) Release the eleven joints f, the front panel and the rear

cover become separate. (See fig.10)

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

(See fig.11)

Fig.9

Fig.10

Fig.11

H H

Top chassis

Cassette mechanism assembly

CN402

CN401 CN403

K K

Joint h

Front panel assembly

Rear cover

LCD & Key control board

KS-FX621

1-6 (No.49825)

2.2 CD 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

2.2.1 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

2.2.2 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

KS-FX621

(No.49825)1-7

2.2.3 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 hanger assembly

Cassette stabilizer spring

Hook f

Hook e

Cassette hanger assembl

Hook h

Hook g

assette holder

ssembly

Cassette holder assembly

Cassette hanger assembly

Cassette catch

KS-FX621

1-8 (No.49825)

2.2.4 Removing the side bracket assembly

(See Fig.8 to 10)

(1) Remove the screw Aattaching the side bracket assembly.

(2) Detach the front side of the side bracket assembly upward

and pull out forward to release the joint iand jin the rear.

CAUTION:

When reassembling, make sure that the boss kof the main

chassis is set in the notch of the load rack under the side

bracket assembly. Do not reattach the load rack on the boss k.

CAUTION:

After reattaching the side bracket assembly, confirm opera-

tion.

Fig.8

Fig.9

Fig.10

Side bracket assembly

Side bracket assembly Joint i

Joint j

Joint i

Joint j

Side bracket assembly

Boss k

Load rack

Boss k

Load rack

KS-FX621

(No.49825)1-9

2.2.5 Removing the pinch arm (F) assembly

(See Fig.11 and 12)

(1) Remove the polywasher and pull out the pinch arm (F) as-

sembly.

(2) Remove the compulsion spring.

Fig.11

Fig.12

2.2.6 Removing the pinch arm (R) assembly

(See Fig.11 and 13)

(1) Remove the polywasher and pull out the pinch arm (R) as-

sembly.

Fig.13

Fig.14

2.2.7 Removing the slide chassis assembly

(See Fig.14 and 15)

REFERENCE:

It is not necessary to remove the head and the tape guide.

(1) Move the slide chassis assembly in the direction of the ar-

row to release the two joints land remove from the main

chassis.

(2) Remove the rack link.

CAUTION:

When reassembling, first reattach the rack link, and next fit the

boss mand hook nof the slide chassis assembly to the hole

of the main chassis, and engage the two joints l.

Fig.15

Polywashe

Polywasher Pinch arm

(F) assembly

Pinch arm

(R) assembly

Polywasher Pinch arm (F) assembly

Compulsion spring

Pinch arm

(R) assembly Polywashe

Slide chassis

assembly

Joint l

Boss m

Hook

Rack link

Head

Tape guide

KS-FX621

1-10 (No.49825)

2.2.8 Removing the head / tape guide

(See Fig.16 and 17)

REFERENCE:

It is not necessary to remove the slide chassis assembly.

(1) Remove the band attaching the wire to the head.

(2) Remove the two screws B, the head and the head support

spring.

(3) Remove the pinch arm spring from the tape guide.

(4) Remove the tape guide and the pinch spring arm.

CAUTION:

When reattaching the pinch arm spring, set both end of it to the

pinch spring arm ( remarked o).

CAUTION:

When reattaching the head, set the wires into the groove of the

tape guide (Fig.16).

Fig.16

Fig.17

2.2.9 Removing the flywheel assembly (F) & (R)

(See Fig.18 and 19)

REFERENCE:

It is not necessary to remove the slide chassis assembly.

(1) Remove the belt at the bottom.

(2) Remove the two polywashers on the upper side.

(3) Pull out each flywheel assembly downward.

Fig.18

Fig.19

Slide chassis assembly

Head Tape guide

BPinch arm spring

Head

Head support spring

Tape guide

Pinch spring arm

Slid chassis assembly

Flywheel assembly (F)

Flywheel assembly (R)

Belt

Polywasher

Flywheel assembly (F)

Flywheel assembly (R)

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