JVC KS-FX230 Bedienungsanleitung

KS-FX230

1-1

SERVICE MANUAL

CASSETTE RECEIVER

No.49565

Jul. 2000

KS-FX230

Area Suffix

UF ------------------ China

Contents

Safety precaution 1-2

Disassembly method 1-3 Adjustment method 1-9

Description of major ICs 1-12

This service manual is printed on 100% recycled paper.

MO/RND SCAN/RPT

SOUND

LOUD

DISP

PROGBAND

Multi

Music

Scan

CD CHANGER CONTROL

SEL SSM

78 9101112

123456

40W

ATT

CD-

TUNER TAPE

KS-FX230

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-FX230

1-3

Disassembly method

1. Disengage the four tabs in the right and left side of

unit and pull the front chassis forward to remove it.

Removing the front chassis (see Fig.1)

Removing the bottom cover and heat

sink (see Fig.2,3)

Removing the main board (see Fig.4)

Removing the rear panel (see Fig.4)

Removing the mechanism ass'y (see Fig.5)

Removing the front panel unit (see Fig.6)

Remove one screw Aretaining the IC to the heat sink.

Remove two screws Bto remove the heat sink.

Turn the upside down, the insert and turn the screwdriver

to remove the bottom cover and protect sheet.

Remove two screws Cretaining the rear panel to the

chassis.

Remove two screws Dretaining the main board.

Lift up the main board to remove it. At this time,

remove the connector CP702 connecting the main

board and mechanism assembly.

Remove six screws retaining the jacks or the like.

Remove two screws Eto the 16-pin jack.

Remove one screw Fto remove the line-out jack.

Remove one screw Gto remove the antenna jack.

Remove one screw Hto remove the changer

controller jack.

Remove four mechanism mounting screws Iretaining

the mechanism assembly.

Remove four screws Jretaining the cover.

Remove one screw which is the fixation of top cover

and the substrate.

1. Remove four screws Kretaining the rear cover.

Front chassis

Fig. 1

Bottom cover

Fig. 2

Heat sink

Left side view

Fig. 3

Main board

CP702

Connection to the mechanism

connector position

Fig. 4

EHFGC

Fig. 6

Mechanism ass'y

Fig. 5

KS-FX230

1-4

<< Cassette mechanism section >>

Desolder the lead wires of the loading motor at the 2

positions shown (Red and Black).

Desolder the lead wire of the head at the 3 positions

shown (RED,Yellow and Black).

Remove the three screws Asecuring the head relay

board.

Shift the interlocking section asecuring the head

relay board in the direction shown by the arrow to

remove the board.

Removing the head relay board (see Fig.1)

Removing the load arm ass'y (see Fig.2)

Removing the cassette holder and arm

ass'y (see Fig.3)

Removing the sub chassis ass'y (see Fig.4)

Shift the load arm ass'y counter clockwise.

Remove the load arm ass'y from the catch.

Using tweezers, detach the mylar washer 1securing

the load arm ass'y and pull out the load arm ass'y.

NOTE : When reassembling, be sure to use a new

mylar washer.

Remove the head relay board.

Remove the load arm ass'y.

Apply DC 6V to the lead wire of the loading motor

ass'y and turn the load gear ass'y to the position

shown in Fig.3.

Remove the screw Bsecuring the cassette holder

and holder arm ass'y.

Shift the cassette holder and holder arm ass'y in the

direction shown by the arrow and remove them from

the interlocking section bof the sub chassis ass'y.

Remove the head relay board.

Remove the load arm ass'y.

Remove the cassette holder and holder arm ass'y.

Remove the two screw Cand Dsecuring the sub

chassis ass'y.

NOTE : When removing the sub chassis ass'y, the

mode gear may become detached. In this

case, set it back to the original position.

Red

Black

Black Yellow Head relay board

Fig. 1

AA a

Catch

Load arm ass'y Fig. 2 1

Apply DC 6V

Fig. 3

Loading motor ass'y

Loading gear ass'y

Sub chassis ass'y

Cassette holder

Holder

KS-FX230

1-5

Remove the head relay board.

Remove the load arm ass'y.

Remove the cassette holder and holder arm ass'y.

Remove the sub chassis ass'y.

Disengage the spring holding the play head down.

Remove the two screws Esecuring the play head.

Removing the play head (see Fig.4)

Removing the pinch roller ass'y (see Fig.5,6)

Removing the reel disk ass'y (see Fig.7)

6. Pull out the pinch rollers.

Remove the head relay board.

Remove the load arm ass'y.

Remove the cassette holder and holder arm ass'y.

Remove the sub chassis ass'y.

Detach the mylar washers cat the two positions

securing the right and left pinch roller ass'y.

Remove the head relay board.

Remove the load arm ass'y.

Remove the cassette holder and holder arm ass'y.

Remove the sub chassis ass'y.

Detach the mylar washer dfrom the tip by first

pressing down the reel feather to expose it.

NOTE : When reassembling, be sure to use a new

mylar washer

NOTE : When reassembling, be sure to use new

mylar washers. Also, make sure that grease

is not adhering to the pinch rollers.

Play head

Spring

Fig.4

Pinch roller ass'y

Fig.5

Sub chassis

Pinch roller ass'y

Fig.6

Fig.7

Reel feather

push

Reel disk ass'y

KS-FX230

1-6

Remove the head amp PCB.

Remove the load arm ass'y.

Remove the cassette holder and holder arm ass'y.

Remove the sub chassis ass'y.

Remove the right and left pinch roller ass'y.

From the rear of the head plate, detach the mylar

washer eand the washer pressing the forward/

reverse plate down. (see Fig. 8)

Remove the screw Ffixing the metal detection lever

and removal spring as shown in Fig. 8.

Remove the head plate.

Pull out the mode gear. (see Fig. 9)

Removing the head plate (see Fig. 8,9)

Remove the head relay PCB.

Remove the load arm ass'y.

Remove the cassette holder and holder arm ass'y.

Remove the sub chassis ass'y.

Remove the head plate.

Disengage the main belt from the flywheel ass'y.

(see Fig. 8)

Remove E washers fat the two positions which

secure the capstan shaft away from the surface.

(see Fig. 9)

Pull out the flywheel ass'y from the rear.

Removing the flywheel ass'y (see Fig. 9)

Remove the head relay PCB.

Remove the load arm ass'y.

Remove the cassette holder and holder arm ass'y.

Remove the sub chassis ass'y.

Straighten the curved tab gsecuring the reel disk

PCB. (see Fig. 10)

Remove the two screws Gfixing the reel disc PCB.

Remove the reel disk PCB.

Removing the reel disk PCB (see Fig. 10)

NOTE : When installing the mode gear, set it to the

arrow mark.

Forward/reverse plate

Spring

Metal tape detection lever

Main belt

Fig.8

Head plate

Capstan shaft

Marking

Mode gear

Fig.9

Reel desk PCB

Fig.10

KS-FX230

1-7

NOTE : When reassembling, be sure to use a new

mylar washer.

Remove the head relay ass'y.

Remove the load arm ass'y.

Remove the Mylar washer hfixing the worm gear.

(see Fig.11)

Remove the screw Hfixing the loading motor ass'y.

(see Fig.11)

Remove the two screws Ifixing the loading motor

ass'y. (see Fig 11)

NOTE : The set arm ass'y and the mode gear

should be positioned as shown in Fig.12.

3. Attach the cassette holder as shown in Fig.13. In this

case, first pass the tab of the section ithrough the

mechanism j, then attach the cassette holder in the

direction shown by the arrow.

Removing the loading motor ass'y

(see Fig. 11)

(Procedures for reassembling)

Insert the mode gear into the sub chassis ass'y.

Install the sub chassis ass'y and secure it with the

two screws Cand Das shown in Fig.12.

Loading motor ass'y

Worm gear

Motor bracket

Sub chassis ass'y Fig.11

Sub chassis ass'y

Mode gear Set arm ass'y

Fig.12

Cassette holder i

Fig.13

KS-FX230

1-8

4. Set the catch to the holder arm ass'y as shown in

Fig.14.

While attaching the holder arm ass'y to the cassette

holder, insert the shaft of the holder arm ass'y into

the interlocking section kof the sub chassis ass'y as

shown in Fig.15.

Install the spring attached to the folder arm ass'y

shaft over the set arm ass'y as shown in Fig.16.

After the holder arm ass'y is installed, secure it with

the screw B. (see Fig.15)

10.

After the installation, apply DC 6V to the lead wires

of the loading motor ass'y to locate the load gear

ass'y as shown in Fig.17.

Install the load arm ass'y.

Install the head relay PCB.

11.

Solder the loading motor and head lead wires to the

head relay PCB, respectively. (see Fig.19)

NOTE : Install it so that the slide switch lever of the

head relay PCB is set in the PCB stay hook

of the sub chassis ass'y. (see Fig.18)

Holder arm ass'y

Cassette holder

Refer to Fig.16

Apply DC 6V

Catch

Holder arm ass'y

Fig.14

Holder arm ass'y

Spring

Set arm ass'y

Fig.15

Fig. 16

Fig. 17

Loading motor

Head PCB

Fig.19

Slide switch

PCB stay

Fig.18

KS-FX230

1-9

Adjustment method

Electoronic voltmeter

Audio frequency osillator

(range ; 50 20kHz and outp ut 0 dB with impedance of

660 )

Attenuator (impedance;600 )

Frequency counter

AM Standard signal generator

FM Standard signal generator

Wow flutter mater

Torqu testing cassette gauge

CTG N (mechanical adjusting)

TW 2111A (FWD play)

TW 2121A (REV play)

Standard tape

VT712 or VTT712 (tape speed,wow & flutter adj.)

VT724 or VTT724 (reference level)

VT738 or VTT736 (playback frequency response)

VT721 or VTT721 (output level)

VT703 or VTT703 (azimuth) (10kHz part only)

Equipment and measuring instruments

used for adujustment Power Spupply DC14.4V

(Reduced voltage ;10.5V)

Load 4

(4-speakers connection)

BASS / TRE,FADER Indication 0

Main volume Position with an output level

of 2V during VT721 playback

Condition for measurement

FM ; 400Hz,22.5kHz deviation (MONO)

FM STEREO ; 1kHz,6.5kHz deviation,

pilotsignal 7.5kHz,66dB V

AM ; 400Hz,30% modulation,74dB V

Output impedznce ; 50

Tuner section

Dummy antenna

Preset Memory Initialization

Preset Memory

Band M1

87.5

531

89.9

603

97.9

999

105.9

1404

108.0

1602

87.5

531

FM(MHz)

AM(kHz)

For ver.U

Manual Tuning Up/Down Frequency

FM: 50kHz

AM: 9kHz

10 4.5

FM SSG 50

SSG Level

66dB

Coaxial Cable Plug to fit

antenna jack

FM DUMMY ANTENNA

AM DUMMY ANTENNA

Input Level

60dB

15pF

AM SSG 50

SSG Level

74dB

Coaxial Cable Plug to fit

antenna jack

Metal shield

must be attached to plug

60pF

KS-FX230

1-10

< Information for using a Car Stereo service jig (for adjustment and checking) >

For 1995 and 1996,we're advancing efforts to make our extension cords common for all Car Stereo products.

Please use this type of extension cord as follows.

As a U shape type top cover is employed,this type of extension cord is needed to check operation of the

mechanism assembly after disassembly.

Extension cords

Disassembly method (Refer to method to remove main parts)

Connection diagram

EXT KSRT002 18P (18 pin extension cord)

For connection between mechanism assembly and main

PCB assembly.

Check for mechanism-driving section such as motor, etc.

Remove the bottom cover.

Remove the front panel assembly.

Remove the top cover. (Remove the screws at each side of heat sink and rear panel.)

Install the front panel (whose assembly was removed in step 2) to the main unit.

Confirm that current is being carried by connecting an extension cord jig.

Extension cord

Mechanism assembly

Front panel assembly

KS-FX230/KS-F130

Main board assembly Available to connect to the CN701 connector

when installing the front panel.

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