Jvc KS-FX201 Service Manual

SERVICE MANUAL

CASSETTE RECEIVER

KS-FX201

Contents

Safety precaution Disassembly method Adjustment method Description of major ICs

Area Suffix

U ---- Other Areas

1-2 1-3 1-12 1-16

This service manual is printed on 100% recycled paper.

No.49589

Jan. 2001

KS-FX201

Safety precaution

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.

1-2

Disassembly Method

KS-FX201

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.

Front panel unit

Fig. 1

Bottom cover

Push the release button

Front chassis

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.

Front chassis

Bottom cover

Top chassis

Fig. 2

Fig. 3

Bottom cover

Rear panel

Fig. 4

1-3

KS-FX201

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

the rear panel.

6. Separate the main board assembly and cassette mechanism assembly.

7. Take out the main board assembly.

Heat sink

Fig. 5

Main board assembly

Fig. 6

Rear panel

Fig. 7

1-4

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.

Cassette mechanism

KS-FX201

Front side

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 panel

Top chassis

Fig. 8

Front cover

Fig. 9

Fig. 10

iii

Operation switch board

Fig. 11

1-5

KS-FX201

Head amplifier board

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 amplifier 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

CJ901

To head relay board

Fig. 12

Relay board

( 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.

Chassis assembly

Fig. 13

1-6

Fig. 14

KS-FX201

Prior to performing the following procedures, remove the head amplifier board, the relay board and the mechanism bracket.

Removing the direction switch board

(See Fig.1)

Unsolder the three wires a on the direction switch board.

Remove the one screw A attaching the direction switch board.

Removing the FF / REW lever assembly

(See Fig.1)

Remove the screw B attaching the FF / REW lever assembly on the back of the cassette mechanism assembly.

Remove the screw C on the upper side of the FF / REW lever assembly.

Lift and pull forward the FF / REW lever assembly to disengage the joints b, c, d and e.

Joint e

Joint d

FF / REW lever assembly

Solding a

Direction switch board

Fig.1

Joint c

Joint b

Reattaching 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 e to the chassis.

1-7

KS-FX201

Pinch-roller (R) assembly

A arm spring (b)

Shaft

Remove the P arm spring (r) from the chassis.

P arm spring (r)

S support plate

C washer

FF roller

Removing the playback head (See Fig.2)

Prior to performing the following procedure, remove the direction switch board and the FF / REW lever assembly.

Pinch-roller (F) assembly

A arm spring (a)

Shaft

Playback head

Remove the P arm spring (f) from the chassis.

P arm spring (f)

Fig.2

Remove the screw D attaching 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.

ATTENTION:

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

Removing the pinch-roller (R) and (F) assembly (See Fig.2)

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.

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.

1-8

KS-FX201

Removing the cassette hanger / cassette holder (See Fig.3)

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 g in 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 i of the return link and the eject lever.

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 holder.

Joint g

Cassette holder

Return link

Joint i

Cassette hanger

Eject lever

Joint h

Chassis

Joint h

Tab f

Joint g

Fig.3

C washer

Remove the C washer and pull out reel disc assembly.

ATTENTION:

Replace with a new C washer when reattaching.

Removing the motor assembly

(See Fig.5)

Unsolder the two wires j on the motor assembly. ATTENTION:

Turn over the cassette mechanism assembly and remove the main belt and the sub-belt from the motor pulley.

ATTENTION:

To replace the sub-belt, remove the main belt and the sub-belt from the motor pulley. Then remove the three screws E and one screw F. Replace with a new sub-belt while lifting the reel base assembly slightly.

The main belt can now be removed.

C washer

Flywheel (BF)

Fig.4

Main-belt

Reel disc assembly

Motor assembly

Sub-belt

Motor pulley

Solding j

Remove the two screws G attaching the motor assembly.

Flywheel (BR)

Reel base assembly

Fig.5

1-9

KS-FX201

Removing the Flywheel (BF) and (BR) assembly (See Fig.4 and 5)

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 reel base assembly

(See Fig.5 and 6)

Raise the part k of 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.

C washer

Flywheel (BF)

Fig.4

Main-belt

Reel disc assembly

Motor assembly

Sub-belt

Motor pulley

Remove the three screws E and the one screw F on the underside of the cassette mechanism assembly.

ATTENTION:

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

Inside of the reel base assembly

Flywheel (BR)

Reel base assembly

Fig.5

Pinch-roller (R) assembly

Solding j

1-10

Selector link (B).

Turn the selector link (B).

Fig.6Fig.7

Removing the mute switch board

(See Fig.8)

Unsolder the two wires l on the mute switch board on the back of the cassette mechanism assembly.

Remove the screw H attaching the mute switch board.

Cassette mechanism assembly

Solding l

Fig.8

Rower switch

Mute

switch board

KS-FX201

Motor assembly

Removing the power switch (See Fig.9)

Prior to performing the following procedure, remove the motor assembly.

Unsolder the two wires m on the power switch on the side of the cassette mechanism assembly.

Remove the screw I attaching the power switch.

Solding m

Cassette mechanism assembly

Rower switch

Fig.9

1-11

KS-FX201

Adjustment Method

Test Instruments reqired for adjustment

1. Digital osclloscope(100MHz)

2. Frequency Counter meter

3. Electric voltmeter

4. Wow & flutter meter

5. T est T apes

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

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

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

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

6. T orque 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)

Frequency Band

MODEL

Band

FM AM

87.5-108MHz 531-1602KHz

KS-FX201

50KHz step

9KHz step

1-12

Arrangement of Adjusting & Test points

Cassette mechanism (Surface)

Motor assembly

Tape speed adjust

KS-FX201

Playback head

Head section view

Azimuth screw

Head azimuth screw

Fixed screw

Playback head

Height adjusting screw c

Height adjusting screw b

Height adjusting screw a

1-13

KS-FX201

Information for using a Car Audio Service Jig

1. For 1995 and 1996 , we're advancing efforts to make our extension cords common for all car audio products. Please use this type of extension cord as follows.

2. 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.

3. Extension cord : EXTKSRT002-6P ( 6 pin extension cord ) For connection between mechanism assembly and main board assembly . Check for mechanism driving section such as motor ,etc..

Disassembly Method

1. Remove the bottom cover.

2. Remove the front panel assembly.

3. Remove the top cover .

4. Install the front panel.

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

Note Available to connect to the CN701 connector when installing the front panel.

Cassette mechanism

EXTKSRT002-6P

Extension cord : EXTKSRT002-6P

Main board

Front panel assembly

1-14

+ 30 hidden pages