JVC KS-LH60R Service Manual

SERVICE MANUAL

CASSETTE RECEIVER

4985520036

KS-LH60R

SOUND

ATT

U

SOURCE

F

R

D

VOL

VOL

Area Suffix

E ----------- Continental Europe

TABLE OF CONTENTS

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

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

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

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20

5 TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24

6 DESCRIPTION OF MAJOR ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25

COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED

No.49855

2003/6

SPECIFICATION

AUDIO AMPLIFIER SECTION Maximum Power Output: Front 50 W per channel

Rear 50 W per channel

Continuous Power Output
(RMS):

Load Impedance 4 Ω (4 Ω to 8 Ω allowance)
Tone Control Range Bass ±10 dB at 100 Hz

Frequency Response 40 Hz to 20 000 Hz
Signal-to-Noise Ratio 70 Db
Line-Out Level/Impedance 2.0 V/20 kΩ load (250 nWb/m)
Output Impedance 1 kΩ

TUNER SECTION Frequency Range FM 87.5 MHz to 108.0 MHz

[FM Tuner] Usable Sensitivity 11.3 dBf (1.0 ΩV/75 Ω)
50 dB Quieting Sensitivity 16.3 dBf (1.8 ΩV/75 Ω)
Alternate Channel Selectivity (400 kHz) 65 dB
Frequency Response 40 Hz to 15 000 Hz
Stereo Separation 30 dB
Capture Ratio 1.5 dB
[MW Tuner] Sensitivity 20 µV

[LW Tuner] Sensitivity 50 µV

CASSETTE DECK SECTION Wow & Flutter 0.11% (WRMS)

Fast-Wind Time 100 sec. (C-60)
Frequency Response (Dolby B NR OFF) 30 Hz to 16 000 Hz (Normal tape)
Signal-to-Noise Ratio 56 dB (Normal tape)
(Dolby B NR ON) 65 dB
(Dolby B NR OFF) 56 dB
Stereo Separation 40 dB

GENERAL Power Requirement Operating Voltage DC 14.4 V

Grounding System Negative ground
Allowable Operating Temperature 0ºC to +40ºC
Dimensions (W × H × D): Installation Size (approx.) 182 mm ×52 mm × 150 mm

Front 19 W per channel into 4 Ω 40 Hz to 20 000 Hz

at no more than 0.8% total harmonic distortion.

Rear 19 W per channel into 4 Ω 40 Hz to 20 000 Hz

at no more than 0.8% total harmonic distortion.

Treble ±10 dB at 10 kHz

AM (MW) 522 kHz to 1 620 kHz

(LW) 144 kHz to 279 kHz

Selectivity 35 dB

(11 V to 16 V allowance)

Panel Size (approx.) 188 mm × 58 mm × 12 mm
Mass (approx.) 1.5 kg (excluding accessories)

Design and specifications are subject to change without notice.

1-2 (No.49855)

1.1 Safety Precautions

SECTION 1

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.

(No.49855)1-3

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SEVICE INSTRUCTIONS.

1-4 (No.49855)

SECTION 3

DISASSEMBLY

3.1 Main body

3.1.1 Removing the front panel assembly
(See Fig.1)

(1) Press the release button and remove the front panel as-

sembly.

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 a on th e left side, two joints b on the right side and
joint c on the back side of the main body, then remove the
bottom cover from the main body.

CAUTION:

When releasing the joints using a screwdriver, do not damage
the main board.

Front panel assembly

Release button

Fig.1

Bottom cover

Joint b

Joint a

3.1.3 Removing the front chassis assembly
(See Figs.3 and 4)

• Prior to performing the following procedures, remove the front

panel assembly and bottom cover.
(1) Remove the two screws A on the both sides of the main

body. (See Fig.3.)

(2) Remove the two screws B on the front side of the main

body. (See Fig.4.)

(3) Release the two joints d and two joints e on the both sides

of the main body, then remove the front chassis assembly
toward the front. (See Fig.3.)

Joint a

Joint d

Joint d

Joint c

Fig.2

A

Front chassis assembly

A

Fig.3

Front chassis assembly

Joint b

Joint e

Joint e

B

Fig.4

(No.49855)1-5

3.1.4 Removing the heat sink
(See Fig.5)

• Prior to performing the following procedure, remove the front

panel assembly.
(1) Remove the two screws C and screw D attaching the heat

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

C

3.1.5 Removing the rear panel
(See Fig.6)

• Prior to performing the following procedure, remove the front

panel assembly and bottom cover.
(1) Remove the two screws E, one screws F and three screws

G attaching the rear panel on the back side of the main
body.

Reference:

During reassembly, before fixing the rear bracket onto the
main body, insert the STEERING cable into the slot.

3.1.6 Removing the main board
(See Fig.7)

• 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 H attaching the main board on the

top chassis.

(2) Disconnect the connector CP401 on the main board from

the cassette mechanism assembly.

H

E

D

Rear bracket

Heat sink

Fig.5

G

F

G

E

Insert steering cables into the slots.

Fig.6

Main board

H

1-6 (No.49855)

CP401

Fig.7

3.1.7 Removing the cassette mechanism assembly

(See Fig.8)

• Prior to performing the following procedures, remove the front

panel assembly, bottom cover, front chassis assembly, heat
sink, rear panel and main board.
(1) Disconnect the wire from the connector CN402 on the

mecha board.

(2) Disconnect the card wire from the connector CN403 on the

mecha board.

(3) Remove the four screws J attaching th e cassette mecha-

nism assembly to the top chassis, take out the cassette
mechanism assembly.

Cassette mechanism assembly

J

J

3.1.8 Removing the mecha board

(See Fig.9)

• Prior to performing the following procedures, remove the front

panel assembly, bottom cover, front chassis assembly, heat
sink, rear panel and main board.
(1) Disconnect the wire from the connector CN402 on the

mecha board.

(2) Disconnect the card wire from the connector CN403 on the

mecha board.
(3) Remove the screw K attaching the mecha board.
(4) Bend the hook f in the direction of the arrow 1 and move

the mecha board in the direction of the arrow 2.
(5) Remove the mecha board from the mecha bracket (L) of

the top chassis.

J J

CN402

Top chassis

K

CN401

Fig.8

Mecha board

CN403

Fig.9

hook f

1

2

(No.49855)1-7

3.1.9 Removing the front board
(See Figs.10 to 12)

• Prior to performing the following procedures, remove the front

panel assembly.
(1) Remove the four screws L attaching the rear cover on the

back side of the front panel assembly. (See Fig.10.)

(2) Release the nine joints g, the front panel assembly and

rear cover become separate. (See Fig.11.)

(3) Remove the front board from the front panel assembly.

(See Fig.12.)

L

L

Joint g

Rear cover

Front board

L

Rear cover

Fig.10

Front panel assembly

Joints g

Joint g

Joints g

Fig.11

Front panel assembly

Fig.12

1-8 (No.49855)

3.2 Cassette mechanism assembly

r

REFERENCE:

Prior to performing the following procedures, turn the mode
gear on the bottom of the body until the respective part comes
to the EJECT position (Refer to Fig.1).

3.2.1 Removing the cassette guide

(See Fig.2)

(1) Turn the mode gear to set to RVS play or subsequent

mode.

(2) Remove the cassette guide from the main chassis while re-

leasing each two joint tabs a in the direction of the arrow.

Mode gea

Fig.1

Cassette guide

3.2.2 Removing the load arm

(See Fig.3)

(1) Remove the E-washer attaching the load arm.
(2) Move the load arm in the direction of the arrow and release

the joint b on the cassette catch.

Load arm

E-washer

Tab a

Tab a

Fig.2

Joint b

Fig.3

(No.49855)1-9

3.2.3 Removing the cassette hanger assembly / cassette holder

r

(See Fig.4 to 7)

(1) Check the mode is set to EJECT. Push down the front part

of the cassette holder and move in the direction of the ar­row to release the joint c.

(2) Move the rear part of the cassette hanger assembly in the

direction of the arrow to release it from the two joint bosses
d.

(3) Release the holder stabilizer spring fro m the hooks e and

f, then pull out from the cassette hanger assembly.

(4) Bring up the rear side of the cassette hanger asse mbly to

release the joint g and h.

(5) Pull out the cassette catch from the cassette hanger as-

sembly.

Cassette holder assembly

Side bracket

Joints c

Cassette holder assembly

Fig.4

Boss d

Cassette hanger
assembly

Boss d

Cassette stabilizer spring

Hook e

Cassette holder
assembly

Hook g

Cassette hange

assembly

Hook f

Fig.5

Cassette hanger
assembly

Hook h

Fig.6

Cassette hanger assembly

1-10 (No.49855)

Cassette catch

Cassette holder assembly

Fig.7

3.2.4 Removing the side bracket assembly

(See Fig.8 to 10)

(1) Remove the screw A attaching the side bracket assembly.
(2) Detach the front side of the side bracket assembly upward

and pull out forward to release the joint i and j in the rear.

CAUTION:

When reassembling, make sure that the boss k of the
main chassis is set in the notch of the load rack under the
side bracket assembly. Do not reattach the load rack on
the boss k.

CAUTION:

After reattaching the side bracket assembly, confirm op­eration.

Side bracket assembly

Joint i

Joint j

A

Side bracket assembly

Fig.8

Side bracket assembly

Joint i

Joint j

Load rack

Load rack

Boss k

Fig.9

Boss k

Fig.10

(No.49855)1-11

3.2.5 Removing the pinch arm (F) assembly

r

(See Fig.11 and 12)

(1) Remove the polywasher and pull out the pinch arm (F) as-

sembly.

(2) Remove the compulsion spring.

3.2.6 Removing the pinch arm (R) assembly
(See Fig.11 and 12)

(1) Remove the polywasher and pull out the pinch arm (R) as-

sembly.

3.2.7 Removing the slide chassis assembly
(See Fig.13 and 14)

REFERENCE:

It is not necessary to remove the head and the tape guide.
(1) Move the slide chassis assembly in the direction of the ar-

row to release the two joints l and remove from the main
chassis.

(2) Remove the rack link.

CAUTION:

When reassembling, first reattach the rack link, and next
fit the boss m and hook n of the slide chassis assembly
to the hole of the main chassis, and engage the two joints
l.

Joint l

Joint l

Slide chassis assembly

Fig.13

Head

Tape guide

Boss m

Rack link

Hook n

Polywasher

Polywasher

Compulsion
spring

Pinch arm
(R) assembly

Pinch arm
(F) assembly

Fig.11

Pinch arm (F) assembly

Pinch arm
(R) assembly

Polywashe

Fig.14

Polywasher

1-12 (No.49855)

Fig.12

3.2.8 Removing the head / tape guide

(See Fig.16 and 17)

REFERENCE:

It is not necessary to remove the slide chassis assembly.
(1) Remove the band attaching the wire to the head.
(2) Remove the two screws B, the head and the head support

spring.
(3) Remove the pinch arm spring from the tape guide.
(4) Remove the tape guide and the pinch spring arm.

CAUTION:

When reattaching the pinch arm spring, set both end of
it to the pinch spring arm (remarked o).

CAUTION:

When reattaching the head, set the wires into the groove
of the tape guide (Fig.16).

3.2.9 Removing the flywheel assembly (F) & (R)
(See Fig.18 and 19)

REFERENCE:

It is not necessary to remove the slide chassis assembly.
(1) Remove the belt at the bottom.
(2) Remove the two polywashers on the upper side.
(3) Pull out each flywheel assembly downward.

B

Slide chassis assembly

Flywheel assembly (F)

Flywheel assembly (R)

Belt

Fig.17

Polywasher

Polywasher

Head

Head support spring

Tape guide

o

Pinch spring arm

Head

Fig.15

Tape guide

B

Pinch arm spring

Flywheel assembly (F)

Flywheel assembly (R)

Fig.18

o

Slid chassis assembly

Fig.16

(No.49855)1-13

3.2.10 Disassembling the flywheel assembly (F)

r

(See Fig.19 and 20)

(1) Push and turn counterclockwise the spring holder (F) to re-

lease the three joints p on the bottom of the flywheel.

(2) The spring holder (F), the TU spring and the friction gear

play come off.

(3) Remove the polywasher and felt.

3.2.11 Disassembling the flywheel assembly (R)
(See Fig.19 and 20)

(1) Push and turn clockwise the spring h older (R) to release

the three joints q on the bottom of the flywheel.

(2) The spring holder (R), the FF spring and the friction gear

FF come off.

(3) Remove the polywasher and the felt.

3.2.12 Removing the reel board
(See Fig.21 and 22)

(1) Remove the two screws C attaching the reel board.
(2) Move the reel board in the direction of the arrow to release

the joint r.

(3) Unsolder the wires if necessary.

CAUTION:

When reattaching, confirm operation of the MODE
switch and the ST-BY switch.The mode position be­tween EJECT and ST-BY is optimum for reattach­ing.Connect the card wire extending from the reel board
to the FFC pad before reattaching the reel board.

FFC pad

C

Joint

Reel board

C

Fig.21

FFC pad

CT-1 switch

MODE switch

Flywheel
assembly (F)

Joint p

Joints p

Fig.19

Polywasher

Spring holder (R)

Spring holder (F)

TU spring

Friction gear FF

Friction gear play

Polywasher

FF spring

Flywheel
assembly (R)

Joints q

Joint q

Soldering

ST-BY switch

Fig.22

Flywheel assembly (F)

1-14 (No.49855)

Felt

Felt

Flywheel assembly (R)

Fig.20

3.2.13 Removing the gear base arm / gear base link assembly

(See Fig.23 to 25)

(1) Move the gear base arm in the direction of the arrow.
(2) Insert a slotted screwdriver to the gear base spring under

the gear base arm, and release the gear base arm upward
from the boss on the gear base assembly.

(3) Remove the gear base arm from the main chassis while re-

leasing the two joints s.

(4) Move the gear base link assemby in the direction of the ar-

row to release the two joints t.

REFERENCE:

When reattaching the gear base arm, make sure that the
boss on the gear base assembly is inside the gear base
spring.

3.2.14 Removing the FFC pad

(See Fig.25 and 27)

(1) Push each joint hook u of the FFC pad and remove toward

the bottom.

Gear base
link assembly

Gear base spring

Joint t

Gear base arm

Joints s

Hook u

FFC pad

Hook u

Joint t

Fig.23

Gear base arm

Gear base link
assembly

Screwdriver

Fig.24

Gear base arm

FFC pad

Fig.25

(No.49855)1-15

3.2.15 Removing the mode gear

r

r

(See Fig.26 and 29)

(1) Remove the polywasher on the bottom and pull out the

mode gear.

3.2.16 Removing the mode switch actuator
(See Fig.26, 27 and 29)

(1) Pull out the mode switch actuator at the bottom.

REFERENCE:

When reattaching the mode switch actuator to the main
chassis, make sure to set on the shaft and insert v into
the slot w.

3.2.17 Removing the direction link / direction plate
(See Fig.27 to 29)

(1) Remove the polywasher attaching the direction link.
(2) Bring up the direction link to release the thre e joints x, y

and z at a time.

(3) Move the direction plate in the direction of the arrow to re-

lease the two joints a’.

REFERENCE:

When reattaching the direction plate, engage the two
joints a’ and move in the direction of the arrow (Refer to
Fig.28).

REFERENCE:

When reattaching the direction link, move the direction
plate in the direction of the arrow and engage the three
joint x, y and z at a time (Refer to Fig.29).

3.2.18 Removing the mode rack assembly
(See Fig.27 and 28)

(1) Move the mode rack assembly in the direction of the arrow

to release the two joints b’ and the joint c’.

REFERENCE:

When reattaching, set the two b’ on the bottom of the
mode rack assembly into the slots of the main chassis
and move in the direction of the arrow (See Fig.28).

Direction plate

Direction plate

Joints a'

Joint z

Direction link

Direction plate

Mode switch actuator

Direction link

Fig.26

Slot w

Joint y

Polywasher

Fig.27

Mode rack assembly

Joint b'

Mode gear

Polywashe

Mode rack assembly

Joint x

Joint b'

Joint c'

1-16 (No.49855)

Joints a'

Fig.28

Direction link

Mode switch actuator

Polywasher

v

Mode gea

Direction plate

Mode rack assembly

Fig.29

3.2.19 Removing the gear base assembly / take up gear / reflector gear

r

(See Fig.30 to 32)

(1) Push in the pin d’ of the gear base assembly on the upper

side of the body and move the reflector gear toward the
bottom, then pull out.

(2) Remove the polywasher on the bottom and pull out the

take up gear.

(3) Move the gear base assembly in the direction o f the arrow

to release it from the two slots e’ of the main chassis.

REFERENCE:

The parts are damaged when removed. Please replace
with new ones.

3.2.20 Removing the reel driver / reel spindle

(See Fig.32)

(1) Draw out the reel driver from the shaft on the main chassis

and remove the reel driver spring and the reel spindle re­spectively.

CAUTION:

The reel driver is damaged when remo ved. Please re­place with a new one.

Gear base assembly

Pin d'

Polywasher

Slot e'

Slot e'

Fig.30

Take up gear

Reflector gear

Reel driver

Reel driver spring

Reel spindle

Main chassis

Reflector gear

Fig.31

Reel driver

Reel driver spring

Reel spindle

Gear base assembly

Slots e’

Take up gea

Polywasher

Fig.32

(No.49855)1-17

3.2.21 Removing the side bracket assembly
(See Fig.33 to 37)

(1) Remove the eject cam plate spring.
(2) Push the joint f’ through the slot to remove the load rack

downward.

(3) Move the eject cam limiter in the direction of the arrow to

release it from the boss g’ of the side bracket assembly and
from the two joints h’.

(4) Move the eject cam plate in the direction of the arrow to re-

lease the joint i’.

CAUTION:

When reassembling, confirm operation of each part be­fore reattaching the eject cam plate spring.

Joint f'

Side bracket assembly

Boss g'

Eject cam plate

Fig.36

Side bracket assembly

Joint i'

Eject cam plate spring

Side bracket assembly

Joint h'

Side bracket
assembly

Boss g'

Boss g'

Load rack

Fig.33

Eject cam limiter

Joint f'

Fig.34

Eject cam limiter

Eject cam plate

Joint i'

Fig.37

Joint h'

Load rack

Joint h'

1-18 (No.49855)

Eject cam plate

Fig.35

Joint h'

3.2.22 Removing the main motor assembly / sub motor assembly

r
r

r

(See Fig.38 to 40)

(1) Remove the belt at the bottom.
(2) Remove the polywasher and pull out the mode gear.
(3) Pull out the reduction gear (B).
(4) Remove the polywasher and pull ou t the reduction gear

(A).

(5) Remove the two screws attaching the main motor assem-

bly.

(6) Remove the two screws E attaching the sub motor assem-

bly.

(7) Unsolder the wires on the reel board if necessary.

CAUTION:

When reassembling, adjust the length of the wires ex­tending from the sub motor asswmbly by attaching them
to the side of the sub motor assembly with the wires ex­tending from the main motor assembly using a spacer.

Belt

Reduction gear (B)

Reduction gear (B)

E

Mode gear

Polywasher

Fig.38

Main motor

D

assembly

Reduction
gear (A)

Polywashe

Sub moto
assembly

E

Polywasher

Reduction gear (A)

D

Spacer

Main motor assembly

Sub motor assembly

Fig.39

Main motor assembly

Sub motor assembly

Fig.40

Space

(No.49855)1-19

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

 Measuring conditions (Amplifier section)

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

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

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

 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 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)

1-20 (No.49855)

 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 : EXTKSRT002-18P ( 18 pin extension cord ) For connection between mechanism assemblyand 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.
(4) Remove the heat sink.
(5) Remove the rear panel
(6) Remove the main board.
(7) Reattach the heat sink with the two screws B. (Refer to Disassembly method.)
(8) Reattach the rear panel with the screw E. (Refer to Disassembly method.)
(9) Reattach the front panel assembly.

(10) Confirm that current is being carried by connecting an extension cord ji g.

NOTE:

Available to connect to the CJ601

CAUTION :

Be sure to attach the heat sink and rear pa nel on the power ampl ifier IC and regulator I C of a main board when su pplying
the power.If voltage is applied without attaching those parts, the power amplifier IC and regulator IC will be destroyed
by heat.

connector when installing the front panel.

To

Cassette mechanism

EXTKSRT002-18P

Extension cord
EXTKSRT002-18P

To
Main board

Front panel assembly

Cassette mechanism

Main board

(No.49855)1-21

 Arrangement of adjusting & test points

A

Cassette mechanism

(Surface)

Motor assembly

Tape speed adjust

Azimuth screw

(Forward)

Playback head

Azimuth screw B

(Reverse)

Head section view

Azimuth screw B

(Reverse)

Playback head

Azimuth screw A

(Forward)

1-22 (No.49855)

Item Conditions Adjustment and Confirmation methods S.Values Adjust

1. Head azi­muth adjust­ment

Test tape:
SCC-1659
VT703 (10kHz)

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 the cassette
housing, perform the azimuth adjustment.
(1) 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.

(2) 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.)

(3) 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.

Head shield

The head is at low position
during.

Head shield

The head is at High position
during REV.

A line

B line

2. Tape speed
and wow flut­ter confirma­tion

3. Play back
frequency re­sponse confir­mation

Test tape:
VT724 (1kHz)
VT703 (10kHz)
VT721 (315Hz)

Test tape:
VT712 (3kHz)

Test tape:
VT724 (1kHz)
VT739 (63Hz /
1kHz / 10kHz)

Head azimuth adjustment

(1) Load VT724 (1kHz) and play it back in the reverse

play mode. Set the Rch output level to max.

(2) Load VT703 (10kHz) and play it ba ck in the fo rward

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 .

(3) Engage the reverse mode and adjust the output lev-

el to max, with azimuth adjustment screw C.(The
phase difference should be 45 or more.)

(4) When switching between forward and reverse

modes, the difference between channels should be
within 3dB. (Between FWD L and R, REV L and R.)

(5) When VT721 (315Hz) is played back, the level differ-

ence between channels should be within 1.5dB.

(1) 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).

(2) In case of out of specification, adjust the motor with

a built-in volume resistor.

(1) Play test tape VT724, and set the volume position at

2V.

(2) Play test tape VT739 and confirm.1kHz / 10kHz: -1

±3dB,1kHz / 63Hz: 0 ±3dB,

(3) When 10kHz is out of specification, it will be neces-

sary to read adjust the azimuth.

Output
level:
Maximum

PBHead

FWD Adj B

REV Adj C

(0 ) (45 )

Tape speed:
3015Hz to 3045Hz
Wow flutter:
less than 0.35%

Speaker out
1kHz / 63Hz: 0 ±3dB
1kHz / 10kHz: -1 ±3dB

HEIGHT Adj A

phase

Built-in volume
resistor

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

(No.49855)1-23

SECTION 5

TROUBLE SHOOTING

This service manual does not describe TROUBLE SHOOTING.

1-24 (No.49855)

SECTION 6

A

DESCRIPTION OF MAJOR ICs

6.1 BR24L16F-W-X (IC771) : EEPROM

•Pin layout •Pin function

VCC WP SCL SDA

A0 A1 A2 GND

• Block diagram

Symbol I/O Function

VCC - Power supply.

GND - GND

A0,A1,A2 I No use conn ect to GND.

SCL I Serial clock input.

SDA I/O Serial data I/O of slave and ward address.

WP I Write protect terminal.

A0 1

11bit

A1 2

A2 3

GND 4

High voltage osc circuit

Address

decoder

6.2 IC-PST600M/G/-W (IC702) : System reset

Co1

16kbit EEPROM allay

11bit

START

Control circuit

Slave Ward

Address resister

STOP

Power supply
voltage det.

OP1

ACK

8bit

Data

resister

8 Vcc

7 WP

6 SCL

5 SD

1

IN

3

Vout

6.3 LB1641 (IC402) : DC Motor driver

•Pin layout •Truth table
Input Output Mode

IN1 IN2 OUT1 OUT2

0000 Brake

1 2 3 4 5 6 7 8 9

GND OUT1 P1

VZ IN1 IN2

VCC1

VCC2 P2

10

OUT2

1 0 1 0 CLOCKWISE
0 1 0 1 COUNTER-CLOCKWISE
1100 Brake

2

GND

(No.49855)1-25

6.4 CXA2560Q (IC401) : Dolby B type noise reduction system with play back equalizer amp.

• Pin layout & block diagram

PBFB2

PBRIN2

PBGND

PBFIN2

VCT

PBREF

PBFIN1

PBGND

PBRIN1

PBFB1

PBTC2

30 29 28

7k/12k

31

32

33

34

35

45k

36

37

38

39

40

12345

PBTC1

300k

30k

30k

300k

7k/12k

PBOUT2

­+

F2

F1

+

-

PBOUT1

OUTREF2

TAPEIN2

27

100k

70 /120

T2

1

1

T1

100k

70 /120

TAPEIN1

OUTREF1

GND

26

Vcc

DIREF

25

BIAS

MUTE

TAPE EQ

FWD/RVS

Vcc

LPF

6

NC

LINEOUT2

23 22 21

24

OFF/B

+

-

+

-

F3

OFF/B

-

+

7

LINEOUT1

TCH2

NC

MSSW

NR

MS MODE

NR MODE

MS ON/

OFF

DET

NR

8910

NC

TCH1

MSLPF

16

15

14

13

12

• Pin function
Pin No. Symbol I/O Function

1 PBTC1 - Playback equalizer amplifier

capacitance

2 PBOUT1 O Playback equalizer amplifier

output
3 OUTREF1 O Output reference
4 TAPEIN1 I TAPE input
5 Vcc - Power supply
6NC­7 LINEOUT1 O Line output
8 TCH1 - Time constant for the HLS
9NC-

10 MSLPF - Cut-off frequency adjustment

of the music sensor LPF

11 G2FB - Music signal interval detectio n
12 G1FB - Music signal interval detectio n
13 MSTC - Time constant for detecting

music signal interval

14 MSOUT O Music sensor out
15 NC - No use
16 NRSW I Dolby NR control
17 MUTESW I Mute function control
18 TAPESW I Playback equalizer amplifier

control

19 DRSW I Head select control
20 MSMODE I Music sensor mode control
21 MSSW I Music sensor control
22 NC ­23 TCH2 - Time constant for the HLS
24 LINEOUT2 O Line output

20

MSMODE

DRSW

19

TAPESW

18

MUTESW

17

NRSW

NC

MSOUT

MSTC

G1FB

G2FB

11

Pin No. Symbol I/O Function

25 DIREF - Resistance for setting the

reference
26 GND - Ground
27 TAPEIN2 I TAPE input
28 OUTREF2 O Output reference
29 PBOUT2 O Playback equalizer amplifier

output
30 PBTC2 - Playback equalizer amplifier

capacitance
31 PBFB2 I Playback equalizer amplifier

feedback
32 PBRIN2 I Playback equalizer amplifier

input
33 PBGND - Playback equalizer amplifier

ground
34 PBFIN2 I Playback equalizer amplifier

input
35 VCT O Center
36 PBREF O Playback equalizer amplifier

reference
37 PBFIN1 I Playback equalizer amplifier

input
38 PBGND - Playback equalizer amplifier

ground
39 PBRIN1 I Playback equalizer amplifier

input
40 PBFB1 I Playback equalizer amplifier

feedback

1-26 (No.49855)

6.5 HA13164A (IC901) : Regulator

• Terminal layout

123456789101112131415

• Block diagram

ANT OUT

EXT OUT

ANT CTRL

CTRL

CD OUT

AUDIO OUT

C3

0.1u

C4

0.1u

C5

0.1u

C6

10u

2

1

7

11

12

10

VCC ACC

8

Surge Protector

BIAS TSD

15

3

TAB

C1

100u

C2

0.1u

13

ILM AJGND GND

+B

ACC

BATT.DET OUT

9

COMPOUT

6

VDD OUT

4

SW5VOUT

5

ILMOUT

14

R1

C7

0.1u

0.1u

C8

UNIT R:

C:F

note1) TAB (header of IC)

connected to GND

• Pin function
Pin No. Symbol Function

1 EXTOUT Output voltage is VCC-1 V when M or H level applied to CTRL pin.
2 ANTOUT Output voltage is VCC-1 V when M or H level to CTRL pin and H level to ANT-CTRL.
3 ACCIN Connected to ACC.
4 VDDOUT Regular 5.7V.
5 SW5VOUT Output voltage is 5V when M or H level applied to CTRL pin.
6 COMPOUT Output for ACC detector.
7 ANT CTRL L:ANT output O FF H:AN T output ON
8 VCC Connected to VCC.

9 BATT DET Low battery detect.
10 AUDIO OUT Output voltage is 9V when M or H level applied to CTRL pin.
11 CTRL L:BIAS OFF M:BIAS ON H:CD ON
12 CD OUT Output voltage is 8V when H level applied to CTRL pin.
13 ILM AJ Adjustment pin for ILM output voltage.
14 ILM OU T Output voltage is 10V when M or H level applied to CTRL pin.
15 GND Connected to GND.

(No.49855)1-27

6.6 LC75873NW (IC601):LCD Driver

• Pin layout

60 41

61

40

80

21

1 20

• Block diagram

S5

S4/P4

S3/P3

S2/P2

S62

S66

L

DI

SEGMENT DRIVER

SHIFT REGISTOR

ADDRESS

DETECTOR

E

• Pin function

VDD1

VDD2

INH

OSC

VDD

VSS

COM2

COM3

COMON
DRIVER

CLOCK

GENERATOR

COM1

Pin No. Pin name I/O Description

79,80

1,2,3

S1/P1 to S4/P4

S5 to S68

O Segment outouts for displaying the display data transferred by serial data input.

The S1/P1 to S4/P4 pins can be used as generalpurpose output ports under serial data control.

to 66

67
78
69

COM1
COM2
COM3

O Common driver outputs.

The frame frequency f0 is given by :
f0 = (FOSC/384)Hz.

74 OSC I/O Oscillator connection

An oscillator circuit is formed by connecting an external resistor and capacitor to this pin.

76
77
78

CE

CL

DI

I

Serial data transfer inputs.

I

Connected to the controller.

I

CE:Chip enable
CL:Synchronization clock
DI:Transfer data

75 INH

I Display off control input

•INH

= "L"(VSS) ---Display forced off
S1/P1 to S4/P4 = "L"
(These pins are forcibly set to the segment output port function and held at the low level.)
S5 to S68 = "L"
COM1 to COM3"L"

= "H"(HDD)---Display on

•INH
However, serial data transfer is possible when the display is forced off by this pin.

71 VDD1 I Used for applying the LCD drive 2/3 bias voltage externally. Must be connected to VDD2 when a 1/2

bias drive scheme is used.

72 VDD2 I Used for applying the LCD drive 1/3 bias voltage externally. Must be connected to VDD1 when a 1/2

bias drive scheme is used.
70 VDD - Power supply connection. Provide a voltage of between 3.0 and 6.0V.
73 VSS - Power supply connection. Connect to ground.

S1/P1

1-28 (No.49855)

6.7 SAA6579T-X (IC71):RDS detecter

•Pin layout

QUAL

DATA

Vref

MUX

GND

CIN

SCOUT

1

2

3

4

V

dd

5

6

7

8

16

15

14

13

12

11

10

9

• Block diagram

CLK

T57

OSCO

OSCI

V

dd

GND

TEST

MODE

121413

4

8

7

CLOCKED
COMPARATOR

5

3

REFERENCE
VOLTAGE

ANTI­ALIASING
FILTER

6 11

VP1

57 kHz
BAND PASS
(8th ORDER)

COSTAS LOOP
VARIABLE AND
FIXED DIVIDER

CLOCK
REGERATION
AND SYNC

• Pin function
Pin No. Symbol Description

1 QUAL Quality indication output
2 DATA RDS data output
3 Vref Reference voltage output (0.5VDDA)
4 MUX Multiolex signal input
5 Vdd +5V supply voltage for analog part
6 GND Ground for analog pa rt (0V)
7 CIN Sub carrier input to comparator
8 SCOUT Sub carrier output of reconstruction filter

9 MODE Oscillator mode / test control input
10 TEST Test enable input
11 GND Ground for digital part (0V)
12 Vdd +5V supply voltage for digital part
13 OSCI Oscillator input
14 OSCO Oscillator output
15 T57 57 kHz clock signal output
16 CLK RDS clock output

RECONSTRUCTION
FILTER

TEST LOGIC AND OUTPUT
SELECTOR SWITCH

OSCILLATOR
AND
DIVIDER

BIPHASE
SYMBOL
DECODER

910

QUALITY BIT
GENERATOR

DIFFERENTIAL
DECODER

1

2

15

15

(No.49855)1-29

6.8 TB2118F-X (IC31) : PLL

• Terminal Layout

2423222120191817161514

13

• Block diagram

FM VCO

AMVCO

DIN

DOUT

123456789

osc

2

1

XO

24

XI

15

16

13

IFC

CE

3

4

CK

5

6

Buff.

ON/OFF

OSC circuit

AMP

AMP

AMP

Serial

Interface

0112

Prescaler

Reference Counter

4-bit

Swallow counter

Programmable counter

20-bit BINARY COUNTER

Resistor 1

Resistor 2

I/O PORT

22-bit

OUTPUT PORT

Phase

Comparator

12-bit

40bit shift register

Constant

power supply voltage

switch

Vdd

switch

Vcc

AM CP.

20

­+

+

-

RF

22

19

Vt

18

FM cp

7

SL

8

9

I/O -2I/O -1

10 11

12

out-2out-1

vdd2

14

17

21

23

a-gnd

vccd-gndvdd

• Pin Function
Pin

Symbol I/O Function

No.

Pin

Symbol I/O Function

No.
1 XOUT O Crystal oscillator pin 13 IFC I IF signal input
2 OSC - Non connect 14 VDD - Power pins for digital block
3 CE I Chip enable input 15 FMIN I FM band local signal input
4 DI I Serial data input 16 AMIN I AM band local signal input
5 CK I Clock input 17 DGND - Connect to GND (for digital circuit)
6 DOUT O Serial data output 18 FMCP O Charge pump output for FM
7 SR O Register control pin 19 Vt - Tuning voltage biased to 2.5V.
8 I/01 I/O I/O ports 20 AMCP O Charge pump output for AM
9 I/02 I/O I/O ports 21 VCC - Power pins for analog block
10 OUT1 - Non connect 22 RF I Ripple filter connecting pin
11 OUT2 - Non connect 23 AGND - Connect to GND (for analog circuit)
12 VDD2 - Single po wer supply for REF. frequency block 24 XIN I Crystal oscillator pin

1-30 (No.49855)

6.9 TEA6320T-X (IC161) : E.volume

•Pin layout

TAP E

32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17

SDA

GND
OUTLR
OUTLF

TL
B2L
B1L

IVL

ILL

QSL

IDL

MUTE

ICL

IMD

IBL
IAL

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16

CD-CH

TUNER

• Block diagram

10 8 9 7 6

SCL
VCC
OUTRR
OUTRF
TR
B2R
B1R
IVR
ILR
QSR
IDR
Vref
ICR
CAP
IBR
IAR

5

12

21
31

2

19

POWER

SUPPLY

VOLUME 1

+20 to -31 dB

LOUDNESS

LEFT

16
15
13
11

14

22
20

SOURCE

SELECTOR

VOLUME 1

+20 to -31 dB

LOUDNESS

RIGHT

18
17

23 25 24 26 27 28

• Pin functions
Pin

No.

Symbol I/O Functions

1 SDA I/O Serial data input/output.
2 GND - Ground.
3 OUTLR O output left rear.
4 OUTLF O output left front.
5 TL I Treble control capacitor left channel

or input from an external equalizer.

6 B2L - Bass control capacitor left channel or

output to an external equalizer.
7 B1L - Bass control capacitor left channel.
8 IVL I Input volume 1. left control part.
9 ILL I Input loudness. left control part.

10 QSL O Output source selector. left channel.
11 IDL - Not used
12 MUTE - Not used
13 ICL I Input C left source.
14 IMO - Not used
15 IBL I Input B left source.
16 IAL I Input A left source.

BASS
LEFT

+15 dB

LOGIC

BASS
RIGHT
+15 dB

VOLUME 2

0 to 55 dB
BALANCE

FENDER REAR

VOLUME 2

0 to 55 dB
BALANCE

FENDER FRONT

HC BUS

REC

3

4

32

TREBLE

LEFT

+12 dB

MUTE

FUNCTION

ZERO CROSS

DETECTOR

1

VOLUME 2

TREBLE

RIGHT
+12 dB

Pin

No.

Symbol I/O Functions

0 to -55dB
BALANCE

FENDER FRONT

VOLUME 2

0 to -55dB
BALANCE

FENDER REAR

29

30

17 IAR I Input A right source.
18 IBR I Input B right source.
19 CAP - Electronic filtering for supply.
20 ICR I Input C right source.
21 Vref - Reference voltage (0.5Vcc)
22 IDR - Not used
23 QSR O Output source selector right channel.
24 IL R I Input loudness right channel.
25 IVR I Input volume 1. right control part.
26 B1R - Bass control capacitor right channel
27 B2R O Bass control capacitor right channel

or output to an external equalizer.

28 TR I Treble control capacitor right channel

or input from an external equalizer.
29 OUTRF O Output right front.
30 OUTRR O Output right rear.
31 Vcc - Supply voltage.
32 SCL I Serial clock input.

(No.49855)1-31

6.10 LA47505 (IC301) : Power amp.

• Terminal layout

206

11

1

12

10

9

7

Protective

circuit

8

5

3

2

4

Stand by

Switch

Ripple

Filter

Mute

circuit

22

15

25

13

14

16

Muting &

On Time Control

Circuit

protective

circuit

17

19

18

21

23

24

1-32 (No.49855)

• Terminal layout

AC CONT1

GND1

OUTFR-

STBY

OUTFR+

Vcc1/2

OUTRR-

GND2

OUTRR+

VREF

INRR

INFR

SGND

INFL

INRL

ONTIME

OUTRL+

GND3

OUTRL-

Vcc3/4

OUTFL+

MUTE

OUTFL-

GND4

NC

• Pin function
Pin No. Symbol Function

1 AC CONT1 Header of IC
2 GND1 Power GND
3 OUTFR- Outpur(-) for front Rch
4 STBY Stand by input
5 OUTFR+ Output (+) for front Rch
6 Vcc1/2 Power input
7 OUTRR- Output (-) for rear Rch
8 GND2 Power GND

9 OUTRR+ Output (+) for rear Rch
10 VREF Ripple filter
11 INRR Rear Rch input
12 INFR Front Rch input
13 SGND Signal GND
14 INFL Front Lch input
15 INRL Rear Lch input
16 ONTIME Power on time control
17 OUTRL+ Output (+) for rear Lch
18 GND3 Power GND
19 OUTRL- Output (-) for rear Lch
20 Vcc3/4 Power input
21 OUTFL+ Output (+) for front
22 MUTE Muting control input
23 OUTFL- Output (-) for front
24 GND4 Power GND
25 NC No connection

6.11 GP1UM261XK (IC602) : Receiver

•Pin layout

Vout

GND

Vcc

• Block diagram

B.P.F.LimiterAmp

Demodulator

Integrator

Comparator

GND Vdd Vout

(No.49855)1-33

6.12 UPD784215AGC208 (IC701) : CPU

• Pin layout

75 51

76

50

100

125

26

• Pin function
Pin No Symbol I/O Function

1 TAPE IN I Cassette tape inside signal H:Inside L:Outside
2 STAND BY I S tand-by position detection signal input H:Loading L:Eject side

3 to 8 NC - Not use

9 VDD - Micon power supply
10 X2
11 X1
12 VSS - GND
13 XT2
14 XT1
15 RESET I System reset
16 Steering I Steering remocon input
17 BUS-INT I J-BUS INT
18 PS2 I Power save2 H means STOP mode
19 NC - Not use
20 RDS-SCK I RDS clock input
21 RDS DA I RDS data input
22 REMOCON I Remocon input
23 AVDD - A/D converter power supply
24 AVREF0 - A/D reference voltage
25 VOL1 I Volume encoder pulse input 1
26 VOL2 I Volume encoder pulse input 2
27 KEY0 I Key input 0
28 KEY1 I Key input 1
29 KEY2 I Key input 2
30 LEVEL I Level meter input
31 NC I S.Quality level input
32 SM I S.METER input
33 AVSS - GND

34,35 NC - Not use

36 AVREF
37 BUS-SI I J-BUS data input
38 BUS-SO O J-BUS data output
39 BUS-SCK I/O J-BUS clock input/output
40 BUS-I/O O J-BUS-I/O selection output:HÅEinput:L
41 LCD-DA O Data output for LCD driver
42 LCD-SCK O CLK output for LCD driver
43 LCD-CE O CE for LCD driver
44 BUZZER O BEEP signal output
45 E2PROM-DI I I2C data input
46 E2PROM-DA I/O E.VOL I2C data input/output
47 E2PROM-CLK O E.VOL I2C clock output
48 OPEN I DOOR OPEN SW

49,50 NC - Not use

1-34 (No.49855)

Pin No Symbol I/O Function

51,52 NC - Not use

53 SD/ST I Station detector or stereo indicator input ;

H means a station is there. L means the program is stereo.
54 NC - Not use
55 MONO O Monaural selection output ; H means monaural

56 to 60 NC - No t use

61 DETACH I Detach detect input ; H means detaching
62 AFCK O AF check output
63 SEEK/STOP O Auto seek and stop selecting output ;

H means seeking L means receiving.
64 IFC CONT O IFC control output
65 FM/AM O FM AM band selecting output ; H = FM L= AM
66 PLL-CE O CE output for PLL IC
67 PLL-DO O Data output for PLL IC
68 PLL-CLK O Clock output for PLL IC
69 PLL-DI I Data input from PLL IC
70 TEL-MUTING I Telephone muting detection input ;

Active level can be selected H or L in PSM
71 NC - Not use
72 VSS - GND
73 DIMMER IN I Dimmer detector input L=dimmer on
74 PS1 I Power save1 L= ACC off
75 POWER O POWER ON/OFF control output H=power on
76 NC - Not use
77 MUTING O Muting output L=muting on

78 to 80 NC - No t use

81 VDD - Micon power supply
82 NC - Not use
83 VOL-DA O Data output for e-vol IC
84 VOL-CLK O Clock output for e-vol IC

85 to 89 NC - No t use

90 STAGE1 I Feature selection
91 MOTOR O Main motor control H:Motor drive
92 FF/REW O Audio level control for MS H:Play mode L:FF/REW mode
93 HEAD SEL(F/R) O Audio signal selector for head amp H:REV L:FWD
94 TEST For rewriting flash memory
95 DOLBY O Dolby ON/OFF control H:Dolby on
96 MS IN I MS signal input L:no music
97 REEL I Reel pulse signal input (Pulse signal)
98 SUBMO- O Sub motor control. Eject direction
99 SUBMO+ O Sub motor control. Loading direction

100 MODE I Mecha position detection signal

(No.49855)1-35

VICTOR COMPANY OF JAPAN, LIMITED

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

(No.49855)

Printed in Japan

WPC