JVC KS-F185 Bedienungsanleitung

SERVICE MANUAL

2005/3

CASSETTE RECEIVER

MA094B20053

KS-F185,KS-F185S,KS-F185G

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17

Area suffix

UN --------------------- Indonesia

KS-F185S

Area suffix

UN --------------------- Indonesia

KS-F185G

Area suffix

KS-F185

UH ---------------------- Thailand

UN --------------------- Indonesia

U -------------------- Other Areas

1-2 (No.MA094B)

SPECIFICATION

Design and specifications are subject to change without notice.

AUDIO AMPLIFIER SECTION

Maximum Power Output Front 45 W per channel

Rear 45 W per channel

Continuous Power Output

(RMS)

Front 17 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than

0.8% total harmonic distortion.

Rear 17 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than

0.8% total harmonic distortion.

Load Impedance 4 Ω(4 Ωto 8 Ωallowance)

Tone Control Range Bass ±10 dB at 100 Hz

Treble ±10 dB at 10 kHz

Frequency Response 40 Hz to 20 000 Hz

Signal-to-Noise Ratio 70 dB

Line-Out Level/Impedance 1.0 V/20 kΩload (250 nWb/m)

TUNER SECTION

Frequency Range FM 87.5 MHz to 108.0 MHz

AM 531 kHz to 1 602 kHz

[FM Tuner] Usable Sensitivity 11.3 dBf (1.0 µV/75 Ω)

50 dB Quieting Sensitivity 16.3 dBf (1.8 µV/75 Ω)

Alternate Channel Selectivity (400 kHz) 65 dB

Frequency Response 40 Hz to 15 000 Hz

Stereo Separation 35 dB

Capture Ratio 2.0 dB

[AM Tuner] Sensitivity 20 µV

Selectivity 35 dB

CASSETTE DECK SECTION

Wow & Flutter 0.15% (WRMS)

Fast-Wind Time 190 sec. (C-60)

Frequency Response 50 Hz to 14 000 Hz (Normal tape)

Signal-to-Noise Ratio 52 dB

Stereo Separation 40 dB

GENERAL

Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)

Grounding System Negative ground

Allowable Operating Temperature 0ºC to +40ºC

Dimensions (W ×H ×D) Installation Size (approx.) 182 mm ×52 mm ×150 mm

Panel Size (approx.) 188 mm ×58 mm ×11 mm

Mass (approx.) 1.3 kg (excluding accessories)

(No.MA094B)1-3

SECTION 1

PRECAUTION

1.1 Safety Precautions

!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.

1-4 (No.MA094B)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 HOW TO IDENTIFY MODELS

2.1.1 NAME PLATE

Discernment sign

(No.MA094B)1-5

SECTION 3

DISASSEMBLY

3.1 Main body

3.1.1 Removing the front panel assembly

(See Fig.1)

(1) Push the detach button and remove the front panel assem-

bly.

Fig.1

3.1.2 Removing the bottom cover

(See Fig.2)

• Prior to performing the following procedures, remove the front

panel assembly.

(1) Turn the body upside down.

(2) Insert a screwdriver under the joints to release the two

joints aon the left side, the two joints bon the right side and

the joint con the back of the body, then remove the bottom

cover from the body.

CAUTION:

When releasing the joints using a screwdriver, do not damage

the board.

Fig.2

3.1.3 Removing the front chassis assembly

(See Fig.3)

• Prior to performing the following procedures, remove the front

panel assembly and bottom cover.

(1) Remove the two screws Aon each side of the body.

(2) Release the two joints dand the two joints eon the sides,

then remove the front chassis assembly toward the front.

Fig.3

Front panel assembly

Detach button

Bottom cover

Joint b

Joint c

Joint a

Joint d

Front chassis assembly

Joint e

Joint dJoint e

1-6 (No.MA094B)

3.1.4 Removing the heat sink

(See Fig.4)

• Prior to performing the following procedure, remove the front

panel assembly.

(1) Remove the screw Band two screws Cattaching the heat

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

Fig.4

3.1.5 Removing the rear panel

(See Fig.5)

• Prior to performing the following procedure, remove the front

panel assembly and bottom cover.

(1) Remove the two screws D, screw Eand three screws Fat-

taching the rear panel on the back of the body.

Fig.5

3.1.6 Removing the main board

(See Fig.6)

• Prior to performing the following procedures, remove the front

panel assembly, bottom cover, front chassis assembly, heat

sink and rear panel.

(1) Remove the two screws Gattaching the main board on the

top chassis.

(2) Disconnect the two connectors (CN901 and CN721) on the

main board from the cassette mechanism assembly.

Fig.6

Heat sink

FRear panel F

Main board

CN901

CN721

(No.MA094B)1-7

3.1.7 Removing the cassette mechanism assembly

(See Fig.7)

• Prior to performing the following procedure, remove the front

panel assembly, bottom cover, front chassis assembly, heat

sink, rear panel and main board.

(1) Remove the four screws Hattaching the cassette mecha-

nism assembly from the top chassis.

Fig.7

3.1.8 Removing the head amplifier board

(See Fig.8)

• Prior to performing the following procedures, remove the front

panel assembly, bottom cover, front chassis assembly, heat

sink, rear panel, main board and cassette mechanism assem-

bly.

(1) Disconnect the wire from CJ901 on the head amplifier

board.

(2) Remove the one screw Jattaching the head amplifier

board.

(3) Move the head amplifier board in the direction of the arrow

to release the two joints f, the head amplifier board can be

removed.

Fig.8

3.1.9 Removing the relay board

(See Fig.9)

• Prior to performing the following procedures, remove the front

panel assembly, bottom cover, front chassis assembly, heat

sink, rear panel, main board and cassette mechanism assem-

bly.

(1) Disconnect the wire from CP722 on the relay board.

(2) Remove the one screw Kattaching the relay board.

(3) Move the relay board in the direction of the arrow to release

the joint g, the relay board can be removed.

Fig.9

Top chassis

Cassette mechanism assembly

CJ901

Head amplifier board

Joint f

To head relay board

CP722

Relay board

Joint g

1-8 (No.MA094B)

3.1.10 Removing the mecha bracket

(See Fig.10)

• Prior to performing the following procedure, remove the front

panel assembly, bottom cover, front chassis assembly, heat

sink, rear panel, main board, cassette mechanism assembly,

head amplifier board and relay board.

(1) Remove the four screws Lattaching the mecha bracket.

Fig.10

3.1.11 Removing the front board

(See Fig.11 to 13)

• Prior to performing the following procedures, remove the front

panel assembly.

(1) Remove the four screws Mattaching the rear cover on the

back of the front panel assembly. (See Fig.11)

(2) Release the nine joints h, the front panel and the rear cover

become separate. (See Fig.12)

(3) Remove the front board from the rear cover. (See Fig.13)

Caution:

Take care not to lose the springs.

Fig.11

Fig.12

Fig.13

Mecha bracket

MFront panel assembly

M M

Joint h

Front board

(No.MA094B)1-9

3.2 Cassette mechanism assembly

• Prior to performing the following procedures, remove the head

amplifier board, the relay board and the mechanism bracket.

3.2.1 Removing the direction switch board

(See Fig.1)

(1) Unsolder the three wires aon the direction switch board.

(2) Remove the one screw Aattaching the direction switch

board.

3.2.2 Removing the FF / REW lever assembly

(See Fig.1)

(1) Remove the screw Battaching the FF / REW lever assem-

bly on the back of the cassette mechanism assembly.

(2) Remove the screw Con the upper side of the FF / REW

lever assembly.

(3) Lift and pull forward the FF / REW lever assembly to disen-

gage the joints b, c, dand e.

3.2.3 Reattaching the FF / REW lever assembly

(See Fig.1)

(1) Reattach the FF / REW lever assembly to the joint con the

back of the chassis.

(2) Reattach the pinch-roller shaft e, the change lever dand

the return link eto the chassis.

Fig.1

3.2.4 Removing the playback head

(See Fig.2)

• Prior to performing the following procedure, remove the direc-

tion switch board and the FF / REW lever assembly.

(1) Remove the screw Dattaching the playback head.

(2) Remove the Cwasher and pull out the FF roller.

(3) Remove the Ssupport plate, the A arm spring (a) and (b),

the playback head.

ATTENTION:

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

3.2.5 Removing the pinch-roller (R) and (F) assembly

(See Fig.2)

• Prior to performing the following procedure, remove the direc-

tion switch board and the FF / REW lever assembly.

(1) Remove the P arm spring (f) in the pinch-roller (F) assem-

bly from the chassis.

(2) Remove the P arm spring (r) in the pinch-roller (R) assem-

bly from the chassis.

(3) 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.

Fig.2

FF / REW lever assembly

Joint c

Joint b

Direction switch board

Joint d

Joint e

Soldering a

A arm spring (b) A arm spring (a)

Pinch-roller (R) assembly Pinch-roller (F) assembly

Shaft Shaft

S support plate

C washer

P arm spring (f)

P arm spring (r)

Remove the P arm spring (f)

from the chassis.

Remove the P arm spring (r)

from the chassis.

Playback head

FF roller

1-10 (No.MA094B)

3.2.6 Removing the cassette hanger / cassette holder

(See Fig.3)

• Prior to performing the following procedure, remove the FF /

REW lever assembly.

(1) From the rear of the unit, bend the two tabs foutwards and

disengage the two joints gin the direction of the arrow.

(2) Push the eject lever and remove the cassette holder from

the playback head. Disengage the two joints hof the cas-

sette hanger / cassette holder and the eject lever in the di-

rection of the arrow.

(3) Lift the cassette hanger / cassette holder and disengage

the joint i of the return link and the eject lever.

Fig.3

3.2.7 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 hold-

er.

(1) Remove the C washer and pull out reel disc assembly.

ATTENTION:

Replace with a new C washer when reattaching.

Fig.4

3.2.8 Removing the motor assembly

(See Fig.5)

(1) Unsolder the two wires jon the motor assembly.

(2) Turn over the cassette mechanism assembly and remove

the main belt and the sub-belt from the motor pulley.

ATTENTION:

The main belt can now be removed.

(3) Remove the two screws Gattaching the motor assembly.

Fig.5

Cassette holder

Cassette hanger

Return link

Joint i

Eject lever

Joint h

Joint g

Joint g Tab f

Tab f

Chassis

Reel disc assembly

C washer

Flywheel (BF)

Flywheel (BR)

Main-belt

Reel base assembly

Sub-belt

Motor assembly

Motor pulley

Soldering j

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