Jvc KS-F162 Service Manual

SERVICE MANUAL

CASSETTE RECEIVER

KS-F162

Contents

Safety precaution Disassembly method Adjustment method Description of major ICs

KS-F162

Area Suffix

E -------- Continental Europe EX ------ Central Europe

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

No.49678

Jan. 2002

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.

KS-F162

Front panel unit

Push the release button

Fig. 1

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. Removie the front chassis. 2 . Turn the unit up side down.

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

4 . Turn the screwdriver and remove the bottom

cover.

Front chassis

Bottom cover

Top chassis

Fig. 2

Front chassis

Bottom cover

Fig. 3

Rear panel

Fig. 4

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KS-F162

Removing the heat sink (SeeFig.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 two screws ( 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

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KS-F162

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.

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

Cassette mechanism

Top chassis

Fig. 8

Front cover

Fig. 9

Fig. 10

Front side

h h

Operation switch board

Fig. 11

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KS-F162

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

Head amplifier board

CJ901

To head relay board

Relay board

Fig. 12

( 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-F162

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

Soldering 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.

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KS-F162

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.

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KS-F162

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

Soldering j

Remove the two screws G attaching the motor assembly.

Flywheel (BR)

Reel base assembly

Fig.5

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KS-F162

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

Soldering 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

Soldering l

Fig.8

Rower switch

Mute

switch board

KS-F162

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.

Soldering m

Cassette mechanism assembly

Power switch

Fig.9

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KS-F162

Adjustment method

Test instruments reqired for adjustment

1. Digital oscilloscoe(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)

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%

FM mono mode

FM stereo mode 1kHz,67.5kHz dev.pilot 7.5kHz dev Output level 0dB(1 V,50 /open terminal)

Measuring conditions(Amplifier section)

Power supply voltage.............. DC14.4V(11V - 16V allowance)

Load impedance............ 4 (4 to 8 allowance)

Line out level/Impedance..............1.0V/20k load (250 nWb/m)

modulation signal on recieving.

97.9MHz/66dB,INT/400Hz,22.5kHz deviation pilot off mono

Frequenc

Frequency band

FM: 87.5 MHz to 108.0 MHz

Band

MW: 522kHz to 1602 kHz LW: 144kHz to 279kHz

1-12

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 methodl

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

KS-F162

EXTKSRT002-6P

Extension cord : EXTKSRT002-6P

Main board

Front panel assembly

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