Jvc Ks-fx381 User manual

SERVICE MANUAL

2005/4

CASSETTE RECEIVER

MA13220054

KS-FX381

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

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

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TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

1-2 (No.MA132)

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 2.0 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 0°C to +40°C

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)

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(No.MA132)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.

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1-4 (No.MA132)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

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(No.MA132)1-5

SECTION 3

DISASSEMBLY

3.1 Main body section

3.1.1 Removing the front panel assembly

(See Fig.1)

(1) Push the detach button in the lower right part of the front

panel assembly and remove the front panel assembly.

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 main 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 main body, then remove the

bottom cover from the main body.

Note:

When releasing the joints using a screwdriver, do not damage

the main 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 both side of the main body.

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

of the main body, 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

A

Joint e

Joint dJoint e

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1-6 (No.MA132)

3.1.4 Removing the side panel

(See Fig.4)

• Prior to performing the following procedure, remove the front

panel assembly.

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

panel on the left side of the main body, and remove the side

panel.

Fig.4

3.1.5 Removing the rear bracket

(See Fig.5)

• Prior to performing the following procedure, remove the front

panel assembly and bottom cover.

(1) Remove the two screws D, two screws Eand three screws

Fattaching the rear bracket on the back side of the main

body.

(2) Removing the rear bracket.

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, side

panel and rear bracket.

(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 and

take out the main board with the top chassis.

Fig.6

Side panel

C

B

C

D

FRear bracketEF

E

D

GG

Main board

CN901

CN721

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(No.MA132)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, side

panel, rear bracket and main board.

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

nism assembly from the top chassis.

(2) Take out the cassette mechanism assembly.

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, side

panel, rear bracket, main board and cassette mechanism as-

sembly.

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

board.

(2) Remove the 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, side

panel, rear bracket, main board and cassette mechanism as-

sembly.

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

(2) Remove the 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

HH

Top chassis

Cassette mechanism assembly

J

CJ901

Head amplifier board

Joint f

K

CP722

Relay board

Joint g

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1-8 (No.MA132)

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, side

panel, rear bracket, main board, cassette mechanism assem-

bly, head amplifier board and relay board.

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

(2) Take out the mecha bracket.

Fig.10

3.1.11 Removing the switch board

(See Fig.11 to 13)

• Prior to performing the following procedures, remove the front

panel assembly.

(1) Remove the four screws Non the back side of the front

panel assembly. (See Fig.11)

(2) Release the nine joints h, and remove the rear cover. (See

Fig.12)

(3) Take out the switch board from the front panel assembly.

(See Fig.13)

Note:

When removing the rear cover assembly and switch board, be

careful not to lose the spring.

Fig.11

Fig.12

Fig.13

Mecha bracket

M

NFront panel assembly

N N

N

Joint h

Switch board

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(No.MA132)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

C

FF / REW lever assembly

Joint c

Joint b

B

A

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

D

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

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1-10 (No.MA132)

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)

E

F

G

Main-belt

Reel base assembly

Sub-belt

Motor assembly

Motor pulley

Soldering j

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(No.MA132)1-11

3.2.9 Removing the Flywheel (BF) and (BR) assembly

(See Fig.4 and 5)

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

sette hanger / cassette holder.

(1) From the upper side of the cassette mechanism assembly,

remove the C washer from each shaft of the flywheel (BF)

and (BR).

(2) Turn over the cassette mechanism assembly and remove

the main belt. Pull out the flywheel (BF) and (BR) down-

ward respectively.

Fig.4

Fig.5

3.2.10 Removing the reel base assembly

(See Fig.5 and 6)

(1) Raise the part kof the reel base assembly slightly and re-

move the selector link (B) on the front side of the cassette

mechanism assembly by turning it as shown in Fig.6.

(2) Remove the three screws Eand the one screw Fon the

underside of the cassette mechanism assembly.

ATTENTION:

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

Fig.6

Fig.7

Reel disc assembly

C washer

Flywheel (BF)

Flywheel (BR)

E

F

G

Main-belt

Reel base assembly

Sub-belt

Motor assembly

Motor pulley

Soldering j

Selector link (B).

Pinch-roller (R) assembly

Turn the selector link (B).

k

Inside of the reel base assembly

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1-12 (No.MA132)

3.2.11 Removing the mute switch board (See Fig.8)

(1) Unsolder the two wires lon the mute switch board on the

back of the cassette mechanism assembly.

(2) Remove the screw Hattaching the mute switch board.

Fig.8

3.2.12 Removing the power switch

(See Fig.9)

• Prior to performing the following procedure, remove the motor

assembly.

(1) Unsolder the two wires mon the power switch on the side

of the cassette mechanism assembly.

(2) Remove the screw Iattaching the power switch.

Fig.9

Cassette mechanism assembly

Soldering l

HMute switch board

Rower switch

Motor assembly

Soldering m

IPower switch

Cassette mechanism assembly

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TEL 13942296513 QQ 376315150 892498299

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(No.MA132)1-13

SECTION 4

ADJUSTMENT

4.1 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)

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.

Measuring conditions (Amplifier section)

AM mode 999kHz/62dB, INT/400Hz, 30% modulation signal on receiving.

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

FM stereo mode 1kHz, 67.5kHz dev. pilot 7.5kHz dev.

Output level 0dB (1µV,50Ω/open terminal)

Power supply voltage : DC14.4V (11V to 16V)

Load impedance : 4 Ω(4 Ωto 8 Ωallowance)

Line out : 1.0V/20kΩload (250 nWb/m)

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TEL 13942296513 QQ 376315150 892498299

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1-14 (No.MA132)

Information for using a car audio service jig

(1) 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 assembly3. Extension cord :

EXTKSRT002-6P ( 6 pin extension cord ) For connection between mechanism assembly and main board.

(4) Check for mechanism driving section such as motor ,etc.

Disassembly method

(1) Remove the front panel assembly.

(2) Remove the bottom cover.

(3) Remove the front chassis assembly.

(4) Remove the heat sink.

(5) Remove the main board.

(6) Reattach the heat sink with the screw B. (Refer to Disassembly method.)

(7) Reattach the front panel assembly.

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

NOTE:

Available to connect to the CJ721 connector when installing the front panel.

CAUTION :

Be sure to attach the heat sink on the power amplifier IC of a main board when supplying the power.

If voltage is applied without attaching the heat sink, the power amplifier IC will be destroyed by heat.

Front Panel assembly

EXTKSRT002-6P

Extension cord

: EXTKSRT002-6P

Main board

Cassette mechanism

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TEL 13942296513 QQ 376315150 892498299

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(No.MA132)1-15

4.2 Arrangement of Adjusting & Test points

Playback head

Head azimuth screw

Fixed screw

Height adjusting screw c

Height adjusting screw b

Height adjusting screw a

Head section view

Cassette mechanism

(Surface)

Tape speed adjust

Motor assembly

Playback head

Azimuth screw

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TEL 13942296513 QQ 376315150 892498299

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1-16 (No.MA132)

Item Conditions Adjustment and Confirmation methods S.Values Adjust

Head

azimuth

adjustment

Head height adjustment

Adjust the azimuth directly. When you

adjust the height using a mirror tape,

remove the cassette housing from the

mechanism chassis.

After installing thecassette housing,

perform the azimuth adjustment.

Load the SCC-1659 mirror tape. Adjust with

height adjustment screw A and azimuth

adjustment screw B so that line A of the

mirror tape runs in the center between Lch

and Rch in the reverse play mode.

After switching from REV to FWD then to

REV, check that the head position set in

procedure 1 is not changed. (If the position

has shifted, adjust again and check.)

Adjust with azimuth adjustment screw B so

that line B of the mirror tape runs in the

center between Lch and Rch in the forward

play mode.

Test tape:

SCC-1659

VT703 (10kHz)

Test tape: VT712

(3kHz)

Test tape: VT724

(1kHz)

VT739

(63Hz / 1kHz / 10kHz)

1.

Tape speed

and wow

flutter

confirmation

2.

Play back

frequency

response

confirmation

3.

1.

2.

3.

Check to see if the reading of the F, counter /

wow flutter meter is within 3015Hz to 3045Hz

(FWD/ REV), and less than 0.35% (JIS RMS).

In case of out of specification, adjust the

motor with a built-in volume resistor.

1.

2.

Play test tape VT724, and set the volume

position at 2V.

Play test tape VT739 and confirm.

1kHz / 10kHz: -1 3dB,

1kHz / 63Hz: 0 3dB,

When 10kHz is out of specification, it will be

necessary to read adjust the azimuth.

1.

2.

3.

Load VT724 (1kHz) and play it back in

the reverse play mode.

Set the Rch output level to max.

Load VT703 (10kHz) and play it back in

the forward play mode. Adjust the Rch

and Lch output levels to max, with

azimuth adjustment screw B. In this case,

the phase difference should be within 45 .

Engage the reverse mode and adjust the

output level to max, with azimuth

adjustment screw C.

(The phase difference should be 45 or

more.)

When switching between forward and

reverse modes, the difference between

channels should be within 3dB. (Between

FWD L and R, REV L and R.)

When VT721 (315Hz) is played back,

the level difference between channels

should be within 1.5dB.

1.

2.

3.

4.

5.

Head azimuth adjustment

Tape speed:

3015Hz

to 3045Hz

Wow

flutter: less

than 0.35%

Speaker out

1kHz / 63Hz

: 0 3dB

1kHz / 10kHz

: -1 3dB

Built-in volume

resistor

The tuner section is of an adjustment-freedesign. In case the tuner is in trouble, replace the tuner pack.

A line

B line

Head shield

PBHead

FWD Adj B

REV Adj C HEIGHT Adj A

phase

(0 ) (45 )

Head shield

The head is at low position

during.

The head is at High position

during REV.

Output

level:

Maximum

Test tape:

VT724 (1kHz)

VT703 (10kHz)

VT721 (315Hz)

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TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

(No.MA132)1-17

SECTION 5

TROUBLESHOOTING

5.1 16 PIN CORD DIAGRAM

Black

RD

BK

Red

BL Blue

WH White

GN Green

VI Violet

GY Gray

RR

FR

FL

RL

ACC

GND

Rear Right

Front Right

Front Left

Rear Left

ACC Line

Ground

Memory Backup Battery+

8

7

6

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2

1 9

10

11

12

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16

BK

RD

NC

BL/WH

WH

GN

VI

GY

WH/BK

GN/BK

VI/BK

GY/BK

NC

YL

B1

B2

B3

B4

A1

A2

A3

A4

NC

NC YL

BL/WH

RD BK

B1

B2

B3

B4

A1

A2

A3

A4

VI

GY

WH

GN

VI/BK

GY/BK

WH/BK

GN/BK

ACC

7 RD

B4

16 YL

A2

MEMORY

5 BL/WH

REMOTE B3

8 BK

GND A4

2 VI

B1 RR+

10 VI/BK

A1 RR-

1 GYB2 FR+

9 GY/BK

A2 FR-

4 WH

B3 FL+

12 WH/BK

A3 FL-

3 GN

B4 RL+

11 GN/BK

A4 RL-

REMOTE

Remote out

MEMORY

YL

Yellow

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TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

(No.MA132)

AV & MULTIMEDIA COMPANY CAR ELECTRONICS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan

Victor Company of Japan, Limited

VPT

Printed in Japan

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TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

SCHEMATIC DIAGRAMS

CASSETTE RECEIVER

No.MA132SCH

2005/4

KS-FX381

Area suffix

UF ------------------------ Chaina

Printed circuit boards

2-1

2-2

Block diagram

Standard schematic diagrams

2-5 to 6

CD-ROM No.SML200504

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TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

!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

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TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

JVC KS-FX381 User manual

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