JVC KS-FX845R Service Manual

SERVICE MANUAL

CASSETTE RECEIVER

4987320035

KS-FX845R

R

5

84

X

F

-

S

K

Area Suffix

EE --------- Russian Federation

TABLE OF CONTENTS

1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

3 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19

4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23

COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED

No.49873

2003/6

SPECIFICATION

AUDIO
AMPLIFIER
SECTION

TUNER SECTION Frequency Range FM1/FM2 87.5 MHz to 108.0 MHz

CASSETTE DECK
SECTION

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

Design and specifications are subject to change without notice.

Maximum Power Output Front 45 W per channel

Rear 45 W per channel
Continuous

Power Output
(RMS)

Load
Impedance

Tone Control
Range

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)

FM3 65.00 MHz to 74.00 MHz
AM (MW) 522 kHz to 1 620 kHz (LW) 144 kHz to

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

[MW Tuner] Sensitivity 20 µV

[LW Tuner] Sensitivity 50 µV
Wow & Flutter 0.11% (WRMS)
Fast-Wind Time 100 sec. (C-60)
Frequency Response 30 Hz to 16 000 Hz(Normal tape)
Signal-to-Noise Ratio 56 dB
Stereo Separation 40 dB

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 × 12 mm
Mass (approx.) 1.5 kg (excluding accessories)

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.
4 Ω (4 Ω to 8 Ω allowance)

Bass ±10 dB at 100 Hz
Treble ±10 dB at 10 kHz

279 kHz

50 dB Quieting
Sensitivity

Alternate Channel
Selectivity (400 kHz)

Frequency
Response

Stereo Separation 35 dB
Capture Ratio 1.5 dB

Selectivity 35 dB

16.3 dBf (1.8 µV/75 Ω)

65 dB

40 Hz to 15 000 Hz

1-2 (No.49873)

1.1 Safety Precautions

SECTION 1

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.

(No.49873)1-3

SECTION 2

B

Front chassis assembly

Disassembly method

2.1 Main body

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

• Press the release button and remove the front panel assembly.

2.1.2 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 the 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 screwd rive r, do no t damage
the main board.

Front panel assembly

Release button

Fig.1

Bottom cover

Joint b

Joint a

2.1.3 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.3

A

Front chassis assembly

A

Fig.3

Joint b

Joint e

Joint e

1-4 (No.49873)

Fig.4

2.1.4 Removing the heat sink

(See Fig.5)

• Prior to performing the following procedure, remove the front

panel assembly.
(1) R emove 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

2.1.5 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, three screws F and three

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

2.1.6 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) D isconnect the connector CP401 on the main board from

the cassette mechanism assembly.

E

D

Rear bracket

Heat sink

Fig.5

Fig.6

G

F

G

E

H

Main board

H

CP701

Fig.7

(No.49873)1-5

2.1.7 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 the cassette mecha-

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

Cassette mechanism assembly

H

H

2.1.8 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.

H H

CN402

Top chassis

Fig.8

Mecha board

J

CN401

Fig.9

CN403

1-6 (No.49873)

2.1.9 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 ten 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

Joints

L

Rear cover

Fig.10

Front panel assembly

g

Joint g

Joints g

Fig.11

Front panel assembly

Fig.12

(No.49873)1-7

2.2 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).

2.2.1 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

2.2.2 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

1-8 (No.49873)

2.2.3 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 from the hooks e and

f, then pull out from the cassette hanger assembly.

(4) Bring up the rear side of the cassette hanger assembly 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

Cassette catch

Cassette holder assembly

Fig.7

(No.49873)1-9

2.2.4 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

1-10 (No.49873)

Fig.10

2.2.5 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.

2.2.6 Removing the pinch arm (R) assembly

(See Fig.11 and 12)

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

sembly.

2.2.7 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 reatta ch the ra ck link, an d 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

Fig.12

(No.49873)1-11

2.2.8 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).

2.2.9 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

Pinch spring arm

Head

Fig.15

o

Tape guide

B

Pinch arm spring

Flywheel assembly (F)

Flywheel assembly (R)

Fig.18

o

1-12 (No.49873)

Slid chassis assembly

Fig.16

2.2.10 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) T he spring holder (F), the TU spring and the friction gear

play come off.

(3) Remove the polywasher and felt.

2.2.11 Disassembling the flywheel assembly (R)

(See Fig.19 and 20)

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

the three joints q on the bottom of the flywheel.

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

FF come off.

(3) Remove the polywasher and the felt.

2.2.12 Removing the reel board

(See Fig.21 and 22)

(1) R emove 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

Felt

Flywheel assembly (F)

Fig.20

Felt

Flywheel assembly (R)

(No.49873)1-13

2.2.13 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.

2.2.14 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

Screwdriver

Gear base link
assembly

Fig.24

Gear base arm

FFC pad

Fig.25

1-14 (No.49873)

2.2.15 Removing the mode gear

r

r

(See Fig.26 and 29)

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

mode gear.

2.2.16 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.

2.2.17 Removing the direction link / direction plate

(See Fig.27 to 29)

(1) Remove the polywasher attaching the direction link.
(2) B ring up the direction link to release the three 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).

2.2.18 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'

Joints a'

Fig.28

Direction link

Mode switch actuator

Polywasher

v

Mode gea

Direction plate

Mode rack assembly

Fig.29

(No.49873)1-15

2.2.19 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 of 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.

2.2.20 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 removed. 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

1-16 (No.49873)

2.2.21 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'

Eject cam plate

Fig.35

Joint h'

(No.49873)1-17

2.2.22 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 out 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

Sub motor assembly

Fig.39

Main motor assembly

Sub motor assembly

Fig.40

Main motor assembly

Space

1-18 (No.49873)

SECTION 3

Adjustment

3.1 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)

(No.49873)1-19

 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 drivin g 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 jig.

NOTE:

Available to connect to the CJ601

CAUTION :

Be sure to attach the heat sink and rear panel on the power amplifier IC and regulator IC of a main board when supplying
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

1-20 (No.49873)

 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)

(No.49873)1-21

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

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

2. Tape speed
and wow flut­ter confirma­tion

3. Play back
frequency re­sponse confir­mation

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

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 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 .

(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

FWD Adj B

REV Adj C

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

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

PBHead

HEIGHT Adj A

(0 ) (45 )

phase

Built-in volume
resistor

1-22 (No.49873)

4.1 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

SECTION 4

Description of major ICs

C1

100u

VCC ACC

8

Surge Protector

BIAS TSD

3

15

TAB

ILM AJGND GND

C2

0.1u

13

+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 OFF H:ANT 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 OUT Output voltage is 10V when M or H level applied to CTRL pin.
15 GND Connected to GND.

(No.49873)1-23

4.2 LC75823W (IC601) : LCD driver

• Pin Layout

DICLCE

OSC

Vss

VDD2

VDD1

INH

VDD

COM3

COM2

COM1

S52

S51

S50

S49

64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

1

S1
S2
S3
S4
S5
S6
S7
S8

S9
S10
S11
S12
S13
S14
S15
S16

2
3
4
5
6
7
8
9
10
11
12
13
14
15
16

48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33

S48
S47
S46
S45
S44
S43
S42
S41
S40
S39
S38
S37
S36
S35
S34
S33

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

S17

S18

S19

S20

S21

S22

S23

S24

S25

S26

S27

S28

S29

S30

S31

S32

• Pin function
Pin No. Symbol I/O Functions

1 to 52 S1 to S52 O Segment output pins used to display data transferred by serial data input.

53 to 55 COM1 to COM3 O Common driver output pins. The frame frequency is given by : t0=(fosc/384)Hz.

56 VDD -- Power supply connection. Provide a voltage of between 4.5 and 6.0V.
57 INH

58 VDD1 I Used for applying the LCD drive 2/3 bias voltage externally.

59 VDD2 I Used for applying the LCD drive 1/3 bias voltage externally.

60 Vss -- Power supply connection. Connect to GND.
61 OSC I/O Oscillator connection.

62 CE I Serial data interface connection to the controller. CE : Chip enable
63 CL I Serial data interface connection to the controller. CL : Sync clock
64 DI I Serial data interface connection to the controller. DI : Transfer data

I Display turning off input pin.

="L" (Vss) ----- off (S1 to S52, COM1 to COM3="L"

INT

="H" (VDD)----- on

INT
Serial data can be transferred in display off mode.

Must be connected to VDD2 when a 1/2 bias drive scheme is used.

Must be connected to VDD1 when a 1/2 bias drive scheme is used.

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

1-24 (No.49873)

4.3 SAA6579T-X (IC71):RDS detecter

• Pin layout

QUAL

DATA

Vref

MUX

GND

CIN

SCOUT

1

2

3

4

dd

V

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 indicatio n 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 part (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.49873)1-25

4.4 TB2118F-X (IC31) : PLL

• Terminal Layout

2423222120191817161514

13

• Block diagram

FM VCO

AMVCO

DIN

DOUT

123456789

osc

2

1

XO

24

XI

15

16

IFC

13

CE

3

4

CK

5

6

Buff.

ON/OFF

OSC circuit

AMP

AMP

AMP

Serial

Interface

0112

Reference Counter

Prescaler

20-bit BINARY COUNTER

Resistor 1

Resistor 2

I/O PORT

Phase

Comparator

4-bit

Swallow counter

12-bit

Programmable counter

22-bit

40bit shift register

OUTPUT PORT

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 power supply for REF. frequency block 24 XIN I Crystal oscillator pin

1-26 (No.49873)

4.5 TEA6320T-X (IC161) : E.volume

• Pin layout

SDA

1

GND

2

OUTLR

3

OUTLF

4

TL

5

B2L

6

B1L

7

IVL

8

ILL

9

QSL

10

IDL

11

MUTE

12

ICL

13

IBL
IAL

14
15
16

CD-CH

TAP E

TUNER

IMD

• Block diagram

10 8 9 7 6

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

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

5

12

21
31

19

POWER

SUPPLY

2

VOLUME 1

+20 to -31 dB

LOUDNESS

LEFT

16
15
13
11

22
20

14

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 contro l 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

VOLUME 2

0 to -55dB
BALANCE

FENDER FRONT

VOLUME 2

0 to -55dB
BALANCE

FENDER REAR

3

4

32

1

29

30

TREBLE

LEFT

+12 dB

TREBLE

RIGHT

+12 dB

Pin

No.

MUTE

FUNCTION

ZERO CROSS

DETECTOR

Symbol I/O Functions

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 ILR 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.49873)1-27

4.6 UPD784215AGC226 (IC701) : Main micon

• Pin layout & Block diagram

100

1

76

75

25

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 Stand-by position detection signal input H:Loading L:Eject side

3 to 8 no use - Not used

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 no use - Not used
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 VOL,1 I Volume encoder pulse input 1
26 VOL,2 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 SQ I S.Quality level input
32 SM I S.METER input
33 AVSS GND

34,35 no use - Not used

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 selection output;Hinput 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 no use - Not used
45 E2PROM-DI I I2C data input
46 E2PROM-DO O I2C data output
47 E2PROM-CLK O I2C clock output
48 OPEN I DOOR OPEN SW

49,50 no use - Not used

50

51

1-28 (No.49873)

Pin No. Symbol I/O Function

51,52 no use - Not used

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

H means a station is there. L means the program is stereo.
54 no use - Not used
55 MONO O Monaural selection output ; H means monaural

56 to 60 no use - Not used

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

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

Active level can be selected H or L in PSM
71 no use - Not used
72 VSS GND
73 no use - Not used
74 PS1 I Power Save1 L= ACC off
75 POWER O Power ON/OFF control output H=power on
76 no use - Not used
77 MUTING O Muting output L=muting on

78 to 80 no use - Not used

81 VDD Micon power supply
82 no use - Not used
83 VOL-DA O Data output for e-vol ICE
84 VOL-CLK O Clock output for e-vol ICE

85 to 89 no use - Not used

90 STAGE1 I Feature selection (refer to tabel1)
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.49873)1-29

4.7 BR24L16F-W-X (IC771) : EEPROM

A

• Pin layout • Pin function

VCC WP SCL SDA

Symbol I/O Function

VCC - Power supply.
GND - GND

A0,A1,A2 I No use connect to GND.

SCL I Serial clock inp u t.
SDA I/O Serial data I/O of slave and ward address.

A0 A1 A2 GND

WP I Write protect terminal.

• Block diagram

A0 1

11bit

A1 2

A2 3

GND 4

High voltage osc circuit

Address

decoder

11bit

START

Control circuit

4.8 RPM6938-SV4 (IC602) : Remote control receiver

• Pin diagram

1 2 3

• Block diagram

16kbit EEPROM allay

Slave Ward

Address resister

STOP

Power supply
voltage det.

ACK

8bit

Data

resister

8 Vcc

7 WP

6 SCL

5 SD

1-30 (No.49873)

I/V
conversion

AMP

PD

magnetic shield

BPF

fo
trimming
circuit

AGC

Detector

Vcc

Comp

Vcc

22k

Rout

GND

4.9 HA12231FP-X (IC401) : PB Equalizer/Line Mute/Music Sensor

• Pin layout & Block diagram

Vcc

14 13 12 11 10

8

9

Ripple Filter

ALC

1 2 3 4 5 6

GND

Amp.

Ch2

Amp.

Ch1

7

• Pin function
Pin No. Symbol I/O Function

1 VREF O Reference output
2 FIN(R) I Equalizer input
3 RIN(R) I Equalizer input
4 EQOUT(R) O Equalizer output
5 TAI(R) I Tape input
6 PBOUT(R) O PB output
7 MS GV - MS gain terminal
8 120/70 I Mode control input

9 Mute I Mode control input
10 FOR/REV I Mode control input
11 Vcc - Power supply
12 MS O MS output (to MPU)
13 MSDET - Time constant pin for MS rectifier
14 RIP - Ripple filter
15 PBOUT(L) O PB output
16 TAI(L) I Tape input
17 EQOUT(L) O Equalizer output
18 RIN(L) I Equalizer input
19 FIN(L) I Equalizer input
20 GND - Ground

(No.49873)1-31

4.10 LA4743K (IC301) : Power amp.

• Block diagram

IN 1

TAB

IN 2

+

0.22 F

+

0.22 F

11

1

12

Vcc 1/2 Vcc 3/4

6 20

-

+

Protective

circuit

-

+

2200 F 0.022 F

+

9

­7

+

OUT 1+

OUT 1-

PWR GND1

8

+

OUT 2+

5

-

OUT 2-

3

PWR GND2

2

ST BY

R.F

47 F

IN 3

PRE GND

IN 4

+5V
ST ON

+

0.22 F

N.C

+

0.22 F

4

Stand by

Switch

Mute

3.3 F

OUT 3+

OUT 3-

10K

+

Low Level
Mute ON

10

+

Ripple

Filter

Mute

circuit

22

+

15

-

+

-

17

19

25

18

21

23

PWR GND3

OUT 4+

OUT 4-

13

14

Protective

circuit

-

+

+

-

ON TIME C

1-32 (No.49873)

22 F

Muting &

16

+

ON Time Control

Circuit

PWR GND4

24

• Pin layout

TAB

GND

FR-

STDBY

FR+

VP1

RR-

GND

RR+

RIPPLE

INRF

INRR

SGND

FLIN

RLIN

DNTIME

RL+

GND

RL-

VP3

FL+

MUTE

FL-

GND

NC

• Pin function
Pin No. Symbol Function Pin No. Symbol Function

1 TAB Header of IC 14 FLIN Front Lch input
2 GND Power GND 15 RLIN Rear Lch input
3 FR- Outpur(-) for front Rch 16 ONTIME Power on time control
4 STDBY Stand by input 17 RL+ Output (+) for rear Lch
5 FR+ Output (+) for front Rch 18 GND Power GND
6 VP1 Power input 19 RL- Output (-) for rear Lch
7 RR- Output (-) for rear Rch 20 VP3 Power input
8 GND Power GND 21 FL+ Output (+) for front

9 RR+ Output (+) for rear Rch 22 MUTE Muting control input
10 RIPPLE Ripple filter 23 FL- Output (-) for front
11 RRIN Rear Rch input 24 GND Power GND
12 FRIN Front Rch input 25 NC Non connection
13 SGND Signal GND

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

Co1

OP1

4.12 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

1010 CLOCKWISE
0101COUNTER-CLOCKWISE
1100 Brake

1

3

2

IN

Vout

GND

(No.49873)1-33

4.13 HD74HC126FP-X (IC801) : Buffer

• Pin layout • Pin function
Input Output

CA Y

LX Z
HL H
HH L

Note:

H:High level
L:Low level
X:Irrelevant
Z:Off(High-impedance)
State a 3-state input

• Block diagram

1C

1A

1Y

2C

2A

2Y

GND

1
2
3
4
5
6
7

14
13
12
11
10

9
8

VCC

4C

4A

4Y

3C

3A

3Y

Vcc Vcc

1k

Input

Note:

CL includes probe and jig capacitance

See Function Table

1A
2A
3A
4A
1C
2C
3C
4C

1Y

2Y

3Y

4Y

Output

Output

Output

Output

S1

CL

1k

Sample as Load Circuit 1

Sample as Load Circuit 1

Sample as Load Circuit 1

1-34 (No.49873)

(No.49873)1-35

VICTOR COMPANY OF JAPAN, LIMITED

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

(No.49873)

Printed in Japan

WPC