JVC KS-FX834R Bedienungsanleitung

SERVICE MANUAL

CASSETTE RECEIVER

No.49571

Sep. 2000

KS-FX834R

Area Suffix

E ---- Continental Europe

Contents

Safety precaution

Disassembly method

Adjustment method

Description of major ICs

This service manual is printed on 100% recycled paper.

1-2

1-3

1-10

1-14

KS-FX834R

1-2

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.

Safety precaution

KS-FX834R

1-3

Disassembly method

Removing the front panel unit (See Fig.1)

Remove the two screws Aattaching the front

chassis.

Insert a screwdriver to the two joints aon the 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.

1. Press the release switch and remove the front

panel unit in the direction of the arrow.

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

Removing the heat sink (See Fig.4)

1. Remove the three screws Battaching the heat sink

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

sink.

Heat sink

Fig.2

Fig.1

Fig. 3

Fig. 4

Front chassis

KS-FX834R

1-4

Removing the bottom cover

(See Fig.5)

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 rear panel

(See Fig.6 )

Remove the front chassis.

Remove the heat sink.

Remove the bottom cover.

Remove the five screws Battaching the rear panel

and one screw Cattaching the pine jack on the

back of the body.

Removing the main amplifier board

assembly

(See Fig.7)

Remove the front chassis.

Remove the bottom cover.

Remove the rear panel.

Remove the two screws Dattaching the main

amplifier board assembly on the top cover.

Disconnect connector CP701 on the main amplifier

board assembly from the cassette mechanism

assembly.

Bottom cover

Fig. 5

Fig. 6

Fig. 7

CP701

Main board assembly

KS-FX834R

1-5

Cassette mechanism assembly

Top cover

Fig. 8

Fig. 9

Fig. 10

LCD & Key control board

Removing the Cassette mechanism

assembly (See Fig.8)

Remove the front chassis.

Remove the bottom cover.

Remove the main amplifier board assembly.

Remove the fore screws Fattaching the cassette

mechanism assembly from the top cover.

Removing the control switch board

(See Fig.9 and 10 )

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.

KS-FX834R

1-6

For the 6pin harness extending from connector

CN402 on the mecha control P.W.B, disconnect it

from the head relay P.W.B.

Disconnect the card wire from connector CN403 on

the mecha control P.W.B.

Remove the screw A attaching the mecha control

P. W. B .

Move the tab a as shown in Fig.2 and remove the

mecha control P.W.B. while moving it in the direction

of the arrow.

Removing the mecha control P.W.B.

(See Fig.1 and 2)

Disconnect the 6pin harness from connector CN402

and the card wire from CN403 on the mecha control

P.W.B. (Refer to Fig.1 and 2).

Remove the four screws B on the bottom of the

cassette mechanism.

Removing the cassette mechanism

assembly (See Fig.1 to 3)

Fig.1

Cassette mechanism ass’y

Head relay

P.W.B.

6pin

harness

CN402 CN403

CN402

Mecha control P.W.B.

Fig.2

Tab a

Mecha control P.W.B.

Fig.3

Cassette mechanism ass’y

Mecha control P.W.B.

CN403

KS-FX834R

1-7

Unsolder the soldering b on the head relay P.W.B.

Remove the screw C attaching the head relay P.W.B.

Remove the head relay P.W.B. in the direction of the

arrow while releasing the two joints c.

Removing the head relay P.W.B.

(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 P.W.B.

Remove the screw D attaching the sub chassis.

Push the tab e in 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 P.W.B., the load arm and the sub

chassis.

Remove the screw E attaching the reinforce bracket.

Remove the reinforce bracket.

Push the tab g fixing 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 h to 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 P.W.B.

Fig.7

Reinforce bracket

Reinforce

bracket

Cassette holder

Sub chassis

Head relay

P.W.B.

Joint h

Holder arm

Load arm

Joint h

tab g

Fig.5

Spring d

Load arm E washer

Cassette mecha chassis

KS-FX834R

1-8

Prior to performing the following procedure, remove

the head relay P.W.B.and the sub chassis.

Remove the two screws F attaching the play head

(The spring under the play head comes off at the

same time).

Removing the play head (See Fig.9)

Prior to performing the following procedure, remove

the head relay P.W.B. and the sub chassis.

Push each tab i in the direction of the arrow and pull

out the pinch rollers on both sides.

Removing the pinch roller ass’y

(See Fig.9)

Unsolder the soldering j on the reel disc P.W.B.

Push the seven tabs k on the bottom of the cassette

mechanism assembly in the direction of the arrow.

Removing the reel disc P.W.B.

(See Fig.10)

Unsolder the two soldering l of the motor and the sub

motor.

Release the sub motor from the three tabs m. Push

the sub motor upward and pull out it.

Remove the belt on the bottom of the cassette

mechanism assembly and remove the two screws G

attaching the motor.

Removing the motor and the sub motor

(See Fig.10 and 11)

The motors can be detached before

removing the load arm.

ATTENTION:

Fig.8

Cassette holder

and holder arm

Joint h

Shaft

Joint h

Fig.9

Tab i

Pinch roller ass’yPinch roller ass’y

Play head

Spring

Fig.11

Sub motor

Tab m

Load arm

Motor

Soldering l

Tab m

Soldering l

Tab m

Soldering j

Pinch roller ass’y

Tab i Tab i

Tab i

Fig.10

Cassette mechanism ass’y

Tabs k

Reel disc P.W.B.

Soldering j

Tabs k

Motor Belt

Flywheel

KS-FX834R

1-9

Prior to performing the following procedure, remove

the head relay P.W.B, the load arm, the sub chassis,

the cassette holder, the holder arm and the reel disc

P. W. B .

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 P.W.B, the load arm, the sub chassis,

the cassette holder and the holder arm.

Disengage the part n inside 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( )

(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 P.W.B.

Soldering j

Tab k

Motor Belt

Flywheel

Fig.12

Plate

The part n

Reel driver

Reel disc ass’y( )

Push aside

the gear

Tabs o

Reel disc

ass’y( )

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-FX834R

1-10

Adjustment method

Test instruments required for adjustment

1. Digital oscilloscope(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 (2 Speakers connection)

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

Standard volume position

Balance and Bass,Treble volume .Fader

:Center(Indication"0")

Loudness,Dolby NR,Sound,Cruise:Off

following conditions. Playback the test tape VT721.

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

modulation signal on receiving.

FM mono mode 97.5MHz/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)

MC-109C For TAPE CURL confirmation

(without Pad type)

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