JVC KS-FX8R Bedienungsanleitung

SERVICE MANUAL

CASSETTE RECEIVER

No.49580

Jan. 2001

KS-FX8R

Area Suffix

E Continental Europe

40Wx4

DISP

RPT

SSM

SCM

RND

789101112

PTY

-CH

FM/AM TAPE

ATT

DOLBY B NR DAB

RDS

KS-FX8RKS-FX8R

Contents

Safety precaution

Disassembly method

Adjustment method

Description of major ICs

1-2

1-3

1-10

1-14

KS-FX8R

1-2

!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

KS-FX8R

1-3

Press the release switch and remove the front panel

unit in the direction of the arrow.

Disassembly method

Removing the front panel unit

(See Fig.1)

Remove the two screws A attaching the front chassis.

Insert a screwdriver to the two joints aon the left

side of the front chassis, two joints bon the right side

and one joint cfrom upside, then detach the front

chassis toward the front side.

Removing the front chassis (See Fig.2~3)

Remove the three screws B attaching the heat sink

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

sink.

Removing the heat sink (See Fig.4)

Joint c

Heat sink

Fig.2

Fig.1

Fig. 3

Fig. 4

Front panel unit

Front chassis

Joint a

Joint a Joint b

Joint b

KS-FX8R

1-4

Prior to performing the following procedure, remove

the front chassis and the heat sink.

Turn the body upside down.

Insert a screwdriver to the two joints dand two joints

eon both sides of the body and the joint fon the

back of the body, then detach the bottom cover from

the body.

Removing the bottom cover (See Fig.5)

Prior to performing the following procedure, remove

the front chassis, the heat sink and bottom cover.

Remove the five screws C attaching the rear panel

and one screw D attaching the pine jack on the back

of the body.

Removing the rear panel (See Fig.6 )

Prior to performing the following procedure, remove

the front chassis, the heat sink, bottom cover and the

rear panel.

Remove the two screws E attaching the main

amplifier board assembly on the top cover.

Disconnect connector CP401 on the main amplifier

board assembly from the cassette mechanism

assembly.

Removing the main amplifier board assembly

(See Fig.7)

Bottom cover

Fig. 5

Fig. 6

Fig. 7

Main board assembly

Joints d

Joints e

Joint f

Rear panel

CP401

KS-FX8R

1-5

Prior to performing the following procedure, remove

the front chassis, the heat sink, bottom cover and the

main amplifier board assembly.

Remove the four screws Fattaching the cassette

mechanism assembly from the top cover.

Removing the cassette mechanism assembly

(See Fig.8)

Remove the front panel unit from the main body.

Remove the five screws Gattaching the rear cover

on the back of the front panel unit.

Remove the control switch board from the front panel

unit.

Removing the (LCD & key) control switch

board (See Fig.9 and 10 )

Cassette mechanism assembly

FFTop cover

Fig. 8

Fig. 9

Fig. 10

LCD & Key control board

KS-FX8R

1-6

For the 6pin wire extending from connector CN402

on the head amplifier board, disconnect it from the

head relay board.

Disconnect the card wire from connector CN403 on

the head amplifier board.

Remove the screw Aattaching the head amplifier

board.

Move the tab aas shown in Fig.2 and remove the

head amplifier board while moving it in the direction

of the arrow.

Removing the head amplifier board.

(See Fig.1 and 2)

Disconnect the 6pin wire from connector CN402 and

the card wire from CN403 on the head amplifier

board (Refer to Fig.1 and 2).

Remove the four screws Bon the bottom of the

cassette mechanism.

Removing the cassette mechanism

assembly (See Fig.1 to 3)

Fig.1

Cassette mechanism ass’y

Head relay

board

6pin

wire

CN402 CN403

CN402

Head amplifier board

Fig.2

Tab a

Head amplifier board

Fig.3

Cassette mechanism ass’y

Head amplifier board

CN403

KS-FX8R

1-7

Unsolder the soldering bon the head relay board.

Remove the screw Cattaching the head relay board.

Remove the head relay board in the direction of the

arrow while releasing the two joints c.

Removing the head relay board

(See Fig.4)

Remove the E washer attaching the load arm using

a pincette or something like that and remove the

spring d.

Move the part of the load arm marked upwards to

release it from the axis of rotation. Then rotate the

load arm in the direction of the arrow to remove it

from the cach.

Removing the load arm (See Fig.5)

Prior to performing the following procedure, remove

the head relay board.

Remove the screw Dattaching the sub chassis.

Push the tab ein the direction of the arrow to detach

the one side of the sub chassis. Then release the

sub chassis from the tab f.

Removing the sub chassis (See Fig.6)

Prior to performing the following procedure, remove

the head relay board, the load arm and the sub

chassis.

Remove the screw Eattaching the reinforce bracket.

Remove the reinforce bracket.

Push the tab gfixing the cassette holder in the

direction of the arrow and open the cassette holder

and the holder arm upward until they stop at an

angle of 45 degrees. Move the two joints hto the

side and remove the cassette holder and the holder

arm from the shaft.

Removing the cassette holder and the

holder arm in the eject mode

(See Fig.7 and 8)

Fig.4 CSoldering b Joint c

Fig.6

Tab f

Tab e

Cach

Head relay board

Fig.7

Reinforce bracket

Reinforce

bracket

Cassette holder

Sub chassis

Head relay

board

Joint h

Holder arm

Load arm

Joint h

tab g

Fig.5

Spring d

Load arm E washer

Cassette mecha chassis

KS-FX8R

1-8

Prior to performing the following procedure, remove

the head relay board, the load arm, the sub chassis,

the cassette holder, the holder arm and the reel disc

board.

Remove the belt on the bottom of the cassette

mechanism ass’y.

Remove the slit washer attaching the flywheel on the

upper side of the cassette mechanism ass’y and pull

out the flywheel downward. Then remove another

flywheel in the same way.

Removing the flywheel

(See Fig.10 and 12)

Prior to performing the following procedure, remove

the head relay board, the load arm, the sub chassis,

the cassette holder and the holder arm.

Disengage the part ninside of the reel driver which

engages with the shaft, using a pincette or

something like that. Then remove the reel driver from

the shaft.

Remove the reel driver spring and the reel table.

Removing the reel disc ass’y( I )

(See Fig.12 to 14)

When reassembling, make sure to use

a new slit washer.

ATTENTION:

Fig.10

Cassette mechanism ass’y

Tab k

Reel disc board

Soldering j

Tab k

Motor Belt

Flyhwheel

Fig.12

Plate

The part n

Reel driver

Reel disc ass’y( II )

Push aside

the gear

Tabs o

Reel disc

ass’y( I )

The part n

Reel driver

Tab o

Fig.13

Reel driver

Shaft

The part n

Fig.14

Reel driver spring

Reel table

Slit washer

KS-FX8R

1-9

Release the plate from the three tabs o.

Push aside the gear over the reel table using a

pincette or something like that.

Remove the reel disc ass’y ( II ) as with the reel disc

ass’y ( I ).

Removing the reel disc ass’y( II )

(See Fig.12 to 15)

Do not break the front panel tab fitted

to the metal cover.

ATTENTION:

Prior to performing the following

procedure, remove the reel disc ( I ).

ATTENTION:

Fig.15

Push aside the gear and reattach the reel disc Ass’y( I ).

Reel disc ass’y( II )

KS-FX8R

1-10

Adjustment method

Test Instruments reqired for adjustment

1. Digital osclloscope(100MHz)

2. Frequency Counter meter

3. Electric voltmeter

4. Wow & flutter meter

5. Test Tapes

VT724 ....................... for DOLBY level measurement

VT739 ............ For playback frequency measurement

VT712 ....For wow flutter & tape speed measurement

VT703 ..................... For head azimuth measurement

6. Torque gauge .................... Cassette type for CTG-N

(mechanism adjustment)

Measuring conditions(Amplifier section)

Power supply voltage .............. DC14.4V (10.5 - 16V)

Load impedance ........... 4 (2Speakers connection)

Line out............................................................ 20k

Standard volume position

Balance and Bass,Treble volume .Fader

:Center(Indication"0")

Loudness,Dolby NR,Sound,Cruise:Off

Volume position is about 2V at speaker output with

following conditions.Playback the test tape VT721.

AM mode 999kHz/62dB,INT/400Hz,30%

modulation signal on recieving.

FM mono mode 97.9MHz/66dB,INT/400Hz,22.5kHz

deviation pilot off mono

FM stereo mode 1kHz,67.5kHz dev. pilot7.5kHz dev.

Output level 0dB(1 V,50 /open terminal)

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