JVC KS-FX321 Bedienungsanleitung

SERVICE MANUAL

2003/01

KS-FX321

CASSETTE RECEIVER

49771200301

KS-FX321

TABLE OF CONTENTS

1 Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

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

3 Adjustment method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

Area Suffix

U ---------- Other Areas

SEL

ISP

78 9 10 11 12

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KS-FX321

1-2 (No.49771)

SECTION 1

Important Safety Precautions

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.

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KS-FX321

(No.49771)1-3

SECTION 2

Disassembly method

2.1 Main body

2.1.1 Removing the front panel unit

(See Fig.1)

(1) Press the release switch and remove the front panel unit in

the direction of the arrow.

Fig.1

2.1.2 Removing the bottom cover

(See Fig.2)

(1) Turn the body upside down.

(2) Insert a screwdriver to the two joints aand two joints bon

both sides of the body and the joint con the back of the

body, then detach the bottom cover from the body.

CAUTION:

When disengaging the joint c using a screwdriver, do not dam-

age or break the board.

Fig.2

2.1.3 Removing the front chassis

(See Fig.3)

• Prior to performing the following procedure, remove the bottom

cover.

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

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

remove the front chassis toward the front.

Fig.3

Front panel assembly

Eject button

Bottom cover

Joint b

Joint c

Joint a

Joint d Joint e

Front chassis

Joint d

AJoint e

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KS-FX321

1-4 (No.49771)

2.1.4 Removing the heat sink

(See Fig.4)

(1) Remove the four screws Battaching 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

chassis, the heat sink and bottom cover.

(1) Remove the four screws Cattaching the rear panel and

three screw Dattaching the pine jack on the back of the

body.

Fig.5

2.1.6 Removing the main amplifier board assembly

(See Fig.6)

• Prior to performing the following procedure, remove the front

chassis, the heat sink, bottom cover and the rear panel.

(1) Remove the two screws Eattaching the main amplifier

board assembly on the top cover.

(2) Disconnect connector CN901,CN721 on the main amplifier

board assembly from the cassette mechanism assembly.

Fig.6

Heat sink

BB B

CDD

Main board assembly

CN901

CN721

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KS-FX321

(No.49771)1-5

2.1.7 Removing the cassette mechanism assembly

(See Fig.7)

• Prior to performing the following procedure, remove the front

chassis, the heat sink, bottom cover and the main amplifier

board assembly.

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

nism assembly from the top cover.

Fig.7

2.1.8 Removing the head amplifier board

(See Fig.8)

• Prior to performing the following procedure, remove the front

chassis, the bottom cover, the heat sink, the main board as-

sembly and the cassette mechanism assembly.

(1) Remove the screw Gattaching the head amplifier board.

(2) Move the head amplifier board in the direction of the arrow

to release the two joints fand remove.

(3) Disconnect the wire from CJ901 on the head amplifier

board.

Fig.8

F F

Top chassis

Cassette mechanism

joint f

CJ901

Head amplifier board

To head relay board

joint f

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KS-FX321

1-6 (No.49771)

2.1.9 Removing the chassis assembly

(See Fig.9,10)

• Prior to performing the following procedure, remove the front

chassis, the bottom cover, the heat sink, the main board as-

sembly , the cassette mechanism assembly and the head am-

plifier board.

(1) Turn the left side to cassette mechanism assembly.

(2) Disconnect the wire from CP722 on the relay board.

(3) Remove the screw Hattaching the relay board.

(4) Move the relay board in the direction of the arrow to release

the joint g,and remove.

(5) Turn the back side down , remove the four screws Iattach-

ing the chassis assembly.

Fig.9

Fig.10

joint g

CP722

Relay board

Chassis assembly

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KS-FX321

(No.49771)1-7

2.1.10 Removing the (LCD & key) control switch board

(See Fig.11~13)

• Prior to performing the following procedure, remove the front

panel assembly.

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

back of the front panel assembly.

(2) Unjoint the eleven joints hwith the front panel and the rear

cover.

(3) Remove the control switch board on the back of the front

panel.

Fig.11

Fig.12

Fig.13

J J

Joint h

LCD & Key control board

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KS-FX321

1-8 (No.49771)

2.2 Cassette mechanism assembly

• Prior to performing the following procedures, remove the head

amplifier board, the relay board and the mechanism bracket.

2.2.1 Removing the direction switch board

(See Fig.1)

(1) Unsolder the three wires aon the direction switch board.

(2) Remove the one screw Aattaching the direction switch

board.

2.2.2 Removing the FF / REW lever assembly

(See Fig.1)

(1) Remove the screw Battaching the FF / REW lever assem-

bly on the back of the cassette mechanism assembly.

(2) Remove the screw Con the upper side of the FF / REW le-

ver assembly.

(3) Lift and pull forward the FF / REW lever assembly to disen-

gage the joints b, c, dand e.

2.2.3 Reattaching the FF / REW lever assembly

(See Fig.1)

(1) Reattach the FF / REW lever assembly to the joint con the

back of the chassis.

(2) Reattach the pinch-roller shaft e, the change lever dand

the return link eto the chassis.

Fig.1

2.2.4 Removing the playback head

(See Fig.2)

• Prior to performing the following procedure, remove the direc-

tion switch board and the FF / REW lever assembly.

(1) Remove the screw Dattaching the playback head.

(2) Remove the Cwasher and pull out the FF roller.

(3) Remove the Ssupport plate, the A arm spring (a) and (b),

the playback head.

ATTENTION:

The A arm spring (a) differs from the A arm spring (b).

2.2.5 Removing the pinch-roller (R) and (F) assembly

(See Fig.2)

• Prior to performing the following procedure, remove the direc-

tion switch board and the FF / REW lever assembly.

(1) Remove the P arm spring (f) in the pinch-roller (F) assem-

bly from the chassis.

(2) Remove the P arm spring (r) in the pinch-roller (R) assem-

bly from the chassis.

(3) Draw out the pinch roller (F) and (R) assembly from the

shaft.

ATTENTION:

The P arm spring (f) differs from the P arm spring (r).

ATTENTION:

The pinch roller (F) assembly differs from the pinch roller (R)

assembly.

Fig.2

FF / REW lever assembly

Joint c

Joint b

Direction switch board

Joint d

Joint e

Soldering a

A arm spring (b) A arm spring (a)

Pinch-roller (R) assembly Pinch-roller (F) assembly

Shaft Shaft

S support plate

C washer

P arm spring (f)

P arm spring (r)

Remove the P arm spring (f)

from the chassis.

Remove the P arm spring (r)

from the chassis.

Playback head

FF roller

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KS-FX321

(No.49771)1-9

2.2.6 Removing the cassette hanger / cassette holder

(See Fig.3)

• Prior to performing the following procedure, remove the FF /

REW lever assembly.

(1) From the rear of the unit, bend the two tabs foutwards and

disengage the two joints gin the direction of the arrow.

(2) Push the eject lever and remove the cassette holder from

the playback head. Disengage the two joints hof the cas-

sette hanger / cassette holder and the eject lever in the di-

rection of the arrow.

(3) Lift the cassette hanger / cassette holder and disengage

the joint iof the return link and the eject lever.

Fig.3

2.2.7 Removing the reel disc assembly

(See Fig.4)

• Prior to performing the following procedure, remove the FF /

REW lever assembly and the cassette hanger / cassette hold-

er.

(1) Remove the C washer and pull out reel disc assembly.

ATTENTION:

Replace with a new C washer when reattaching.

Fig.4

2.2.8 Removing the motor assembly

(See Fig.5)

(1) Unsolder the two wires jon the motor assembly.

(2) Turn over the cassette mechanism assembly and remove

the main belt and the sub-belt from the motor pulley.

ATTENTION:

The main belt can now be removed.

(3) Remove the two screws Gattaching the motor assembly.

Fig.5

Cassette holder

Cassette hanger

Return link

Joint i

Eject lever

Joint h

Joint g

Joint g Tab f

Tab f

Chassis

Reel disc assembly

C washer

Flywheel (BF)

Flywheel (BR)

Main-belt

Reel base assembly

Sub-belt

Motor assembly

Motor pulley

Soldering j

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KS-FX321

1-10 (No.49771)

2.2.9 Removing the Flywheel (BF) and (BR) assembly

(See Fig.4 and 5)

• Prior to performing the following procedure, remove the cas-

sette hanger / cassette holder.

(1) From the upper side of the cassette mechanism assembly,

remove the C washer from each shaft of the flywheel (BF)

and (BR).

(2) Turn over the cassette mechanism assembly and remove

the main belt. Pull out the flywheel (BF) and (BR) down-

ward respectively.

Fig.4

Fig.5

2.2.10 Removing the reel base assembly

(See Fig.5 and 6)

(1) Raise the part kof the reel base assembly slightly and re-

move the selector link (B) on the front side of the cassette

mechanism assembly by turning it as shown in Fig.6.

(2) Remove the three screws Eand the one screw Fon the un-

derside of the cassette mechanism assembly.

ATTENTION:

The reel base assembly is not repairable. Handle with care.

Fig.6

Fig.7

Reel disc assembly

C washer

Flywheel (BF)

Flywheel (BR)

Main-belt

Reel base assembly

Sub-belt

Motor assembly

Motor pulley

Soldering j

Selector link (B).

Pinch-roller (R) assembly

Turn the selector link (B).

Inside of the reel base assembly

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