JVC KS-FX288 Bedienungsanleitung

SERVICE MANUAL

No.49662

Dec. 2001

KS-FX288

Area Suffix

UF China

CASSETTE RECEIVER

Contents

Safety precaution

Disassembly method

Adjustment method

Description of major ICs

1- 2

1- 3

1- 12

1- 16

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1-2

KS-FX288

!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.

Safety precaution

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1-3

KS-FX288

Fig. 3

Disassembly method

Detaching the front panel unit

( See Fig.1 )

Push the Release button in the direction of arrow to

detach the front panel unit.

Removing the front chassis

( See Fig. 2 and 3 )

Disengage the four tabs ( a ) in the right and left sides of

unit and pull the front chassis forward to remove it.

Removing the bottom cover

( See Fig. 2 to 4 )

1. Removing the front chassis.

2. Turn the unit up side down.

3. Insert the four engagements ( b, c, d, e ) to the

screwdriver .

4. Turn the screwdriver and remove the bottom

cover.

Fig. 2

Fig. 4

Fig. 1

Front chassis

Bottom cover

Top chassis

Bottom cover

Front chassis d

Bottom cover

Rear panel

Front panel unit

Push the release button

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KS-FX288

Removing the heat sink (See Fig.5)

1. Removing the front chassis.

2. Removing the bottom cover

3. Remove the three screws ( 1 and 1' ) retaining the

heat sink.

Removing the main board assembly

( See Fig. 5 to 7)

1. Removing the front chassis.

2. Removing the bottom cover.

3. Removing the heat sink.

Attach the heat sink with a screw ( 1' ) on operat-

ing checks.

4. Remove the two screws ( 2 ) retaining the main

board assembly.

5. Remove the six screws ( 3 ) and one screw ( 3' ) retaining

6. Separate the main board assembly and cassette

mechanism assembly.

7. Take out the main board assembly.

Fig. 5

Fig. 6

Fig. 7

( )

the rear panel.

Heat sink

Main board assembly

Rear panel

333'

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KS-FX288

Fig. 9

Fig. 11

Fig. 10

Removing the cassette mechanism assembly

( See Fig. 8 )

1. Removing the front chassis.

2. Removing the bottom cover.

3. Removing the heat sink.

4. Removing the main board assembly.

5. Remove the four screws ( 4 ) retaining the cassette

mechanism.

6. Separate the top chassis and cassette mechanism.

Fig. 8

Removing the operation switch board

( See Fig. 9 to 11)

1. Detaching the front panel unit.

2. Turn the front panel back side down.

3. Remove the four screws ( 5 ) retaining the front

cover

4. Open the front cover gradually by disengaging the

three engagements ( g ) while pushing the top of

the front cover in the arrow "A" direction, then

disengage the three engagements ( h ) on the both

sides.

5. Place the front panel unit front side down.

6. Disengage the three engagements ( i ) on the

bottom to separate the front cover from the front

panel.

(Be careful not to lose the button springs.)

Front side

Cassette mechanism

Top chassis

Front cover

Front panel

iii

Operation switch board

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KS-FX288

Fig. 14

Removing the head amplifier board

( See Fig. 12 )

1. Removing the front chassis.

2. Removing the bottom cover.

3. Removing the heat sink.

4. Removing the main board assembly.

5. Removing the cassette mechanism.

6. Remove the screw ( 6 ) retaining the head ampli-

fier board.

7. Shift the two inter rocking sections ( j ) securing

the head amplifier board in the direction shown by

the arrow "B" to remove the printed circuit board.

8. From the connector CJ901 on the head amplifier

board from connector wire out going to the head

relay board.

Removing the chassis assembly

( See Fig. 13 and 14 )

1. Removing the front chassis.

2. Removing the bottom cover.

3. Removing the heat sink.

4. Removing the main board assembly.

5. Removing the cassette mechanism.

6. Removing the head amplifier board.

7. Turn the left side to cassette mechanism.

8. Remove the screw ( 7 ) retaining the relay board.

9 Shift the one inter rocking sections ( k ) securing

the relay board in the direction shown by the

arrow "C" to remove the printed circuit board.

10. Turn the back side down, remove the four screws

( 8 ) retaining the chassis assembly.

Fig. 12

Fig. 13

To head relay board

CJ901

Head amplifier board

Relay board

Chassis assembly

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KS-FX288

Prior to performing the following procedures, remove

the head amplifier board, the relay board and the

mechanism bracket.

Unsolder the three wires aon the direction switch

board.

Remove the one screw Aattaching the direction

switch board.

Removing the direction switch board

(See Fig.1)

Remove the screw Battaching the FF / REW lever

assembly on the back of the cassette mechanism

assembly.

Remove the screw Con the upper side of the FF /

REW lever assembly.

Lift and pull forward the FF / REW lever assembly to

disengage the joints b, c, dand e.

Removing the FF / REW lever assembly

(See Fig.1)

Reattach the FF / REW lever assembly to the joint c

on the back of the chassis.

Reattach the pinch-roller shaft e, the change lever d

and the return link eto the chassis.

Reattaching the FF / REW lever assembly

(See Fig.1)

FF / REW lever assembly

Joint c

Joint b

Direction switch board

Joint d

Joint e

Soldering a

Fig.1

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KS-FX288

Prior to performing the following procedure, remove

the direction switch board and the FF / REW lever

assembly.

Remove the screw Dattaching the playback head.

Remove the C washer and pull out the FF roller.

Remove the S support plate, the A arm spring (a)

and (b), the playback head.

Removing the playback head (See Fig.2)

The A arm spring (a) differs from the A

arm spring (b).

ATTENTION:

Prior to performing the following procedure, remove

the direction switch board and the FF / REW lever

assembly.

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

assembly from the chassis.

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

assembly from the chassis.

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

the shaft.

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

assembly (See Fig.2)

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.

ATTENTION:

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

Fig.2

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KS-FX288

Prior to performing the following procedure, remove

the FF / REW lever assembly.

From the rear of the unit, bend the two tabs f

outwards and disengage the two joints gin the

direction of the arrow.

Push the eject lever and remove the cassette holder

from the playback head. Disengage the two joints h

of the cassette hanger / cassette holder and the eject

lever in the direction of the arrow.

Lift the cassette hanger / cassette holder and disengage

the joint iof the return link and the eject lever.

Removing the cassette hanger / cassette

holder (See Fig.3)

Unsolder the two wires jon the motor assembly.1.

Turn over the cassette mechanism assembly and

remove the main belt and the sub-belt from the

motor pulley.

Remove the two screws Gattaching the motor

assembly.

Removing the motor assembly

(See Fig.5)

To replace the sub-belt, remove the

main belt and the sub-belt from the

motor pulley. Then remove the three

screws Eand one screw F. Replace

with a new sub-belt while lifting the reel

base assembly slightly.

ATTENTION:

Prior to performing the following procedure, remove

the FF / REW lever assembly and the cassette

hanger / cassette holder.

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

Removing the reel disc assembly

(See Fig.4)

Replace with a new C washer when

reattaching.

ATTENTION:

The main belt can now be removed.

ATTENTION:

Cassette holder

Cassette hanger

Return link

Joint i

Eject lever

Joint h

Joint g

Joint g Tab f

Tab f

Reel disc assembly

Flywheel (BF)

Flywheel (BR)

Main-belt

Reel base assembly

Sub-belt

Motor assembly

Motor pulley

Soldering j

Fig.3

Fig.4

Fig.5

C washer

Chassis

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KS-FX288

Raise the part kof the reel base assembly slightly

and remove the selector link (B) on the front side of

the cassette mechanism assembly by turning it as

shown in Fig.10.

Remove the three screws Eand the one screw F

on the underside of the cassette mechanism

assembly.

Removing the reel base assembly

(See Fig.5 and 6)

Prior to performing the following procedure, remove

the cassette hanger / cassette holder.

From the upper side of the cassette mechanism

assembly, remove the C washer from each shaft of

the flywheel (BF) and (BR).

Turn over the cassette mechanism assembly and

remove the main belt. Pull out the flywheel (BF) and

(BR) downward respectively.

Removing the Flywheel (BF) and (BR)

assembly (See Fig.4 and 5)

The reel base assembly is not

repairable. Handle with care.

ATTENTION:

Selector link (B).

Inside of the reel base assembly

Reel disc assembly

Flywheel (BF)

Flywheel (BR)

Main-belt

Reel base assembly

Sub-belt

Motor assembly

Motor pulley

Soldering j

Fig.4

Fig.5

Fig.6Fig.7

C washer

Pinch-roller (R) assembly

Turn the selector link (B).

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