JVC KS-FX621 Service Manual

49825200303

KS-FX621

SERVICE MANUAL

CASSETTE RECEIVER

KS-FX621

11

RPT

1097

12

8

MO

RND

S

C

M

MODE

Area Suffix

U ------ Other Areas

TABLE OF CONTENTS

1 Safety precaution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

3 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17

4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21

COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.

No.49825

2003/03

KS-FX621

SECTION 1

Safety precaution

CAUTION

Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in
the case of preforming repair of this system.

1-2 (No.49825)

SECTION 2

Disassembly method

2.1 Main body

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

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

sembly.

2.1.2 Removing the bottom cover
(See Fig.2)

• Prior to performing the following procedure, remove the front

panel assembly.
(1) Turn the body upside down.
(2) Insert a screwdriver under the joints to release the two

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

CAUTION:

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

Front panel assembly

Joint a

Fig.1

Bottom cover

KS-FX621

Release button

Joint

b

2.1.3 Removing the front chassis
(See Fig.3)

• Prior to performing the following procedure, remove the front

panel assembly and bottom cover.
(1) Remove the screw A on each side of the body.
(2) Release the two joints d and the two joints e on the sides,

then remove the front chassis toward the front.

Joint a

Joint c

Fig.2

Joint d

Joint e

A

Joint d Joint e

Front chassis

Fig.3

Joint b

(No.49825)1-3

KS-FX621

2.1.4 Removing the heat sink
(See Fig.4)

• Prior to performing the following procedure, remove the front

panel assembly.
(1) Remove the two scre ws B and two screws C attaching the

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

2.1.5 Removing the rear panel
(See Fig.5)

• Prior to performing the following procedure, remove the front

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

screws F attaching the rear panel on the back of the body.

CB C

Heat sink

Fig.4

2.1.6 Removing the main board
(See Fig.6)

• Prior to performing the following procedure, remove the front

panel assembly, bottom cover, front chassis, heat sink and
rear panel.
(1) Remove the two screws G attaching the main board on the

top chassis.

(2) Disconnect the connectors CP701 on the main board from

the cassette mechanism assembly.

E

G

D

Rear panel

EFF

D

Fig.5

Main board assembly

G

1-4 (No.49825)

CP701

Fig.6

2.1.7 Removing the cassette mechanism assembly

(See Fig.7)

• Prior to performing the following procedure, remove the front

panel assembly, bottom cover, front chassis, heat sink, rear
panel and main board.
(1) Remove the four screws H attaching the cassette mecha-

nism assembly from the top chassis.

2.1.8 Removing the mecha bo ar d

(See Fig.8)

• Prior to performing the following procedure, remove the front

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

CN403 on the mecha board.

(2) Remove the screw J attaching the mecha board.

KS-FX621

Cassette mechanism assembly

H

H

H H

Top chassis

Fig.7

CN402

J

2.1.9 Removing the front board

(See Figs.9 to 11)

• Prior to performing the following procedure, remove the front

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

back of the front panel assembly. (See fig.9)

(2) Release the eleven joints f, the front panel and the rear

cover become separate. (See fig.10)

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

(See fig.11)

K

K

K K

Fig.9

CN401

Front panel assembly

Joint h

LCD & Key control board

Fig.8

Joint h

Joint h

Fig.10

CN403

Joint h

Rear cover

Fig.11

(No.49825)1-5

KS-FX621

r

2.2 CD Mechanism Assembly

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 casse tte 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

1-6 (No.49825)

2.2.3 Removing the cassette hanger assembly / cassette holder

y

(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 directi on 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

KS-FX621

Cassette hanger assembly

Cassette stabilizer spring

Hook f

Hook e

Fig.5

Side bracket

Joints c

Cassette holder assembly

Fig.4

Boss d

Cassette hanger
assembly

Boss d

assette holder

ssembly

Cassette hanger assembl

Hook g

Hook h

Fig.6

Cassette hanger assembly

Cassette catch

Cassette holder assembly

Fig.7

(No.49825)1-7

KS-FX621

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

Side bracket assembly

Joint i

Joint j

Load rack

A

Joint j

Boss k

Fig.9

Side bracket assembly

Fig.8

Boss k

Load rack

1-8 (No.49825)

Fig.10

2.2.5 Removing the pinch arm (F) assembly

r

r

(See Fig.11 and 12)

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

sembly.

(2) Remove the compulsion spring.

KS-FX621

Pinch arm (F) assembly

Polywasher

Compulsion spring

Polywasher

Pinch arm
(R) assembly

2.2.6 Removing the pinch arm (R) assembly

(See Fig.11 and 13)

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

sembly.

Pinch arm
(R) assembly

Pinch arm
(F) assembly

Fig.11

Polywashe

Polywashe

Fig.12

Joint l

Joint l

Slide chassis

assembly

Fig.14

Fig.13

2.2.7 Removing the slide chassis assembly

(See Fig.14 and 15)

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.

Head

Tape guide

Boss m

Rack link

Hook

n

Fig.15

(No.49825)1-9

KS-FX621

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).

Slide chassis assembly

B

Pinch arm spring

Head

Head support spring

Tape guide

o

B

Pinch spring arm

o

Head

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.

Flywheel assembly (F)

Tape guide

Belt

Slid chassis assembly

Fig.17

Polywasher

Polywasher

Flywheel assembly (F)

Flywheel assembly (R)

1-10 (No.49825)

Flywheel assembly (R)

Fig.19

Fig.18

2.2.10 Disassembling the flywheel assembly (F )

r

(See Fig.20 and 21)

(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.

KS-FX621

Polywasher

Spring holder (F)

TU spring

Flywheel assembly (F)

Joints p

Joint p

Fig.20

2.2.11 Disassembling the flywheel assembly (R)

(See Fig.20 and 22)

(1) Push and turn clockwise the spring holder (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.

Polywasher

Spring holder (R)

FF spring

Flywheel assembly (R)

Joints q

Joint q

Friction gear play

Felt

Flywheel assembly (F)

Fig.21

FFC pad

C

Joint

Friction gear FF

Felt

Flywheel assembly (R)

Fig.22

2.2.12 Removing the reel board

(See Fig.23 and 24)

(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.

C

Reel board

Fig.23

FFC pad

CT-1 switch

MODE switch

ST-BY switch

Soldering

Fig.24

(No.49825)1-11

KS-FX621

2.2.13 Removing the gear base arm / gear base link assembly
(See Fig.25 to 27)

(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.

Joint t

Gear base arm

Joints s

Hook u

FFC pad

Hook u

2.2.14 Removing the FFC pad
(See Fig.27 and 29)

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

the bottom.

Gear base
link assembly

Joint t

Gear base spring

Gear base link assembly

Fig.25

Gear base arm

Screwdriver

Fig.26

Gear base arm

1-12 (No.49825)

FFC pad

Fig.27

KS-FX621

r

r

2.2.15 Removing the mode gear

(See Fig.28 and 31)

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

mode gear.

2.2.16 Removing the mode switch actuator

(See Fig.28, 29 and 31)

(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.29 to 31)

(1) Remove the polywasher attaching the direction link.
(2) Bring 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.30).

REFERENCE:

When reattaching the direction link, move the direction plate in
the direction of the arrow and engage the three join t x, y and

z at a time (Refer to Fig.31).

2.2.18 Removing the mode rack assembly

(See Fig.29 and 30)

(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' Eon the bottom of the mode
rack assembly into the slots of the main chassis and move in
the direction of the arrow (See Fig.30).

Mode switch actuator

Direction plate

Direction plate

Direction link

Fig.28

Slot w

Mode rack assembly

Joints a'

Joint z

Direction link

Polywasher

Joint y

Fig.29

Joint x

Direction plate Mode rack assembly

Joint b'

Mode gear

Polywashe

Joint b'

Joint c'

Joints a'

Fig.30

Direction link

Mode switch actuator

Polywasher

v

Mode gea

Direction plate

Mode rack assembly

Fig.31

(No.49825)1-13

KS-FX621

2.2.19 Removing the gear base assembly / take up gear / reflector gear
(See Fig.32 to 34)

(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.

Slot e'

Gear base assembly

Pin d'

Slot e'

Fig.32

2.2.20 Removing the reel driver / reel spindle
(See Fig.34)

(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.

Polywasher

Reflector gear

Reel driver

Reel driver spring

Reel spindle

Take up gear

Fig.33

Reel driver

Reel driver spring

Reel spindle

Gear base assembly

1-14 (No.49825)

Main chassis

Reflector gear

Slots e

Take up gear

Polywasher

Fig.34

2.2.21 Removing the side bracket assembl y

(See Fig.35 to 39)

(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 brack et 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 limiter

Joint h'

Eject cam plate

Fig.37

Side bracket assembly

Boss g'

KS-FX621

Joint h'

Eject cam plate spring

Side bracket assembly

Boss g'

Joint h'

Fig.35

Eject cam limiter

Joint f'

Load rack

Joint h'

Eject cam plate

Eject cam plate

Joint i'

Fig.38

Side bracket assembly

Joint i’

Fig.39

Fig.36

Load rack

(No.49825)1-15

KS-FX621

r

2.2.22 Removing the main motor assembly / sub motor assembly
(See Fig.40 to 42)

(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 D attaching the main motor as-

sembly.

(6) Remove the two scre ws 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)

Mode gear

Polywasher

Fig.40

Polywasher

D

E

Main motor
assembly

Reduction
gear (A)

Polywashe

Sub motor
assembly

E

Spacer

Main motor assembly

Reduction gear (A)

D

Main motor assembly

Sub motor assembly

Fig.41

1-16 (No.49825)

Sub motor assembly

Fig.42

Spacer

SECTION 3

Adjustment

3.1 Adjustment method

Test instruments reqired for adjustment Standard volume position

1. Digital oscilloscoe(100MHz)

2.Frequency counter meter

3.Electric voltmeter

4.Wow & flutter meter

5.Test tapes

VT724.......................for DOLBY level measurement

VT739............For playback frequency measurement

VT712....For wow flutter & tape speed measurement

VT703.....................For head azimuth measurement

6.Torque gauge...................Cassette type for CTG-N

(Mechanism adjustment)

Measuring conditions(Amplifier section)

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 recieving.

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 (1 V,50 /open terminal)

KS-FX621

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

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

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

Frequency band

Band

FM

AM

87.5 MHz to 108.0MHz

522 kHz to 1620 kHz

MW

LW

144 kHz to 279 kHz

(No.49825)1-17

KS-FX621

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 assembly
and main board.

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

D

i

sassembl

1. Remove the front panel assembly.

2. Remove the bottom cover.

3. Remove the front chassis.

4. Remove the rear panel.

5. Remove the heat sink.

6. Remove the main board.

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

8. Install the front chassis and front panel assmbly.

9. Confirm that current is being carried by connecting an extension cord jig.
Note
Available to connect to the CJ701 connector when installing the front panel.

y met

hod

CAUTION :
Be sure to attach a 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.

To
Cassette mechanism

Extension cord
EXTKSRT002-18P

To
Main board

EXTKSRT002-18P

Cassette mechanism

1-18 (No.49825)

Front panel assembly

Main board

Arrangement of adjusting & test points

A

Cassette mechanism

(Surface)

Motor assembly

Tape speed adjust

KS-FX621

Azimuth screw

(Forward)

Playback head

Head section view

Azimuth screw B

(Reverse)

Azimuth screw B

(Reverse)

Playback head

Azimuth screw A

(Forward)

(No.49825)1-19

KS-FX621

Item

Head

1.
azimuth
adjustment

Conditions

Test tape:
SCC-1659
VT703(10kHz)

Adjustment and Confirmation methods

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.

Load the SCC-1659 mirror tape. Adjust with

1.
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

2.
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

3.
that line B of the mirror tape runs in the
center between Lch and Rch in the forward
play mode.

Head azimuth adjustment
Load VT724 (1kHz) and play it back in

1.
the reverse play mode.
Set the Rch output level to max.

Load VT703 (10kHz) and play it back in

2.
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

3.
output level to max, with azimuth
adjustment screw C.
(The phase difference should be 45 or
more.)

When switching between forward and

4.
reverse modes, the difference between
channels should be within 3dB. (Between
FWD L and R, REV L and R.)

S.Values Adjust

A line

Head shield

The head is at low position
during.

B line

Head shield

The head is at High position
during REV.

Output
level:
Maximum

PBHead

FWD Adj B

REV Adj C

(0 ) (45 )

HEIGHT Adj A

phase

Tape speed

2.
and wow
flutter
confirmation

Play back

3.
frequency
response
confiramation

1-20 (No.49825)

When VT721 (315Hz) is played back,

5.
the level difference between channels
should be within 1.5dB.

Test tape: VT712
(3kHz)

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

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

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

1.
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

2.
motor with a built-in volume resistor.

Play test tape VT724, and set the volume

1.
position at 2V.

Play test tape VT739 and confirm.

2.
1kHz / 10kHz: -1 3dB,
1kHz / 63Hz: 0 3dB,

When 10kHz is out of specification, it will be

3.
necessary to read adjust the azimuth.

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

4.1 CXA2559Q (IC401) : Head amp.

•Pin layout

KS-FX621

SECTION 4

Description of major ICs

• Block diagram

1

10

31
32
33
34
35
36
37
38
39
40

45k

30

7k/12k

300k

300k

7k/12k

30

21

F2

30k

30k

F1

29

-

+

+

-

28

100k

X1

X1

100k

27

T2

T1

26

TAPE EQ

FWD/RVS

LPF

25

BIAS

MUTE

Vcc

+

-

F3

+

+

24

-

-

23

24dB

24dB

22

MS MODE

MS ON/

OFF

DET

21

20
19
18
17
16
15
14
13
12
11

1

2

3

4

5

6

7

8

9

10

(No.49825)1-21

KS-FX621

c

Y

Y

Y

Y

4.2 HD74HC126P (IC801) : Changer control

• Pin arrangement • Pin function

11C

21A

31Y

14

13

12

Vc

4C

4A

Input Output

CA Y

LX Z
HL L
HH H

• Block diagram

42C

52A

62Y

7GND

11

10

4Y

3C

9

3A

8

3Y

( TOP VIEW )

1A

1

1C

2A

2

2C

3A

3C

4A

4C

3

4

1-22 (No.49825)

4.3 KIA7810PI (IC902) : Regulator

•Pin layout

1 2 3

• Block diagram

KS-FX621

1 INPUT

R4 R18

Q12

R5

Z1

R6

R7

R1

Q1

Q13

R10 R3

Q8

Q10

Q5

Q7

R8

R2

Q6

Q2

R15

Q14

C1

R14

Q4

Q9

R16

R9

Q15

Q3

Q11

R13

R21

R17

Q16

R12

R19

Q17

R11

3 OUTPUT

R20

2 GND

(No.49825)1-23

KS-FX621

4.4 LC72366-9B41 (IC701) : Micon

• Pin layout

65 ~ 80

64 ~ 41

40 ~ 25

1 ~ 24

• Pin function
Pin No. Symbol I/O Function

1 XIN I 4.5MHz crystal oscillation
2 TEST2 - Connect to ground
3 J-BUS SI I J-BUS signal data input (to 74HC126)
4 J-BUS SO O J-BUS signal data output (to 74HC126)
5 J-BUS SCK O J-BUS output clock signal (to 74HC126)
6 J-BUS I/O I/O J-BUS I/O control ie. "H" = "O", "L" = "I" (to 74HC126)
7NC-No use
8 LCD SO O LCD driver data output (to LC75823E pin 64)

9 LCD SCK O LCD driver clock signal (to LC75823E pin 63)
10 LCD CE O LCD driver chip enable port (to LC75823E pin 62)
11 NC - No use
12 SDA O E. volume data output (to TEA632 0T pin 1)
13 SCL O E. volume clock output (to TEA6320T pin 32)
14 NC - No use
15 TUNER_ILL O Connect to LED (of TUNER button )
16 TAPE_ILL O Connect to LED (of TAPE button)
17 CD_ILL O Connect to LED (of CD button)
18 DIMMER O Connect to display lamp supply

19~24 NC - No use

25 KS1 O Output for initial setting diode matrix
26 KS0 O Output for initial setting diode matrix
27 K3 I Input for initial setting diode matrix
28 K2 I Input for initial setting diode matrix
29 K1 I Input for initial setting diode matrix
30 K0 I Input for initial setting diode matrix
31 Vdd - 5V supply
32 TEST I Change key input to test mode
33 FF/REW O Change MS IC input sensitivity (L at FF/REW)
34 SEEK/STOP O IF count REQ and output [H] at seek.and scan
35 MONO O Output [H] at FM forced monoral mode
36 R/T O Output of mode radio / tape (Radio:H.Tape:L)
37 NC - No use
38 POWER ON - Output [H] at power on
39 ACC O Output [H] during [ACC DET] is [H]
40 IFC CONT O IF count control output (To tuner cct)
41 MOTER O Main motor output (Drive:H Stop:L)
42 SUB MOTER+ O Sub motor output (sub motor loading )
43 SUB MOTER- O Sub motor output (sub motor eject)
44 BEEP O Beep on (output f :2.25KHz)

1-24 (No.49825)

Pin No. Symbol I/O Function

45 TAPE IN I Detect cassette in SW. [H] at cassette in
46 STAND BY I Detect stand by SW position.
47 REEL I Pulse input
48 MODE I Detect mode position.
49 F/R O Output F/R ( Forward:L Reverse:H)
50 MS IN I Detect MS. [H] at no music.
51 SD/ST I Station detect and FM stereo signal input [H] at SD
52 DETACH I Front panel detect
53 JOG-0 I Rotary encoder input 0
54 JOG-1 I Rotary encoder input 1
55 JBUS INT I J-BUS interrupt (to 74HC126)
56 REMOCON I Remocon input
57 BAND O FM/AM band selection ("H" : FM, "L" : AM)
58 DOLBY O Output DOLBY mode ("H" : DOLBY on)
59 IFRQ/AGC O During FM auto search IF request output 'H' after SD detected.

During AM auto search AGC output ("H" : auto search)
60 MUTE O Muting switch
61 P.SAVE2 I Power save 2 : +B detect
62 LEVEL I Level meter input
63 S.METER I S meter input
64 KEY2 I Key 2 data input (AD)
65 KEY1 I Key 1 data input (AD)
66 KEY0 I Key 0 data input (AD)
67 P.SAVE1 I Power save 1, ACC power detect
68 SNS I Voltage sense
69 NC ­70 FM IF COUNT I FM IF counter data input
71 NC ­72 NC ­73 Vdd - 5V supply
74 NC ­75 FM OSC I FM input frequency
76 Vss - Ground
77 NC ­78 EO O PLL error output signa l
79 TEST1 - Connect to ground
80 XOUT O 4.5MHz crystal oscillation

KS-FX621

(No.49825)1-25

KS-FX621

4.5 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

10

+

Ripple

Filter

Mute

22

circuit

3.3 F

+

15

-

+

-

17

19

10K

+

OUT 3+

OUT 3-

Low Level
Mute ON

25

18

21

23

PWR GND3

OUT 4+

OUT 4-

13

14

Protective

circuit

-

+

+

-

ON TIME C

1-26 (No.49825)

22 F

Muting &

16

+

ON Time Control

Circuit

PWR GND4

24

4.6 PT6523LQ (IC651) : LCD driver

•Pin layout

48 ~ 33

49

KS-FX621

32

• Block diagram

64

1 ~ 16

17

COMMON

DRIVER

CLOCK

GENERATOR

ADDRESS

DETECTOR

SEGMENT DRIVER & LATCH

SHIFT REGISTER

• Piin function
Pin No. Pin Name I/O Description

1~ 52 SG1 ~ SG52 O Segment Output Pins

53~55 COM1 ~ COM3 O Common Driver Output Pins

56 VDD - Power Supply
57 INH

I Display OFF Control Input Pin

When this pin is "Low", the Display is forcibly turned OFF. (SG1 to SG52, COM1 to COM3 are
set to "LOW"). (See Note 1)
When this pin is set to "High", the Displa is ON.

58 VDD1 I Used for the 2/3 Bias Voltage when the Bias Voltages are provied externally. Connect to VDD2

when 1/2 Bias is used.

59 VDD2 I Used for 1/3 Bi as Voltage when the Bias Voltages are provided externally. Connect to VDD1

when 1/2 Bias is used.
60 VSS - Ground Pin.
61 OSC I/O Oscillation Input /Outout Pin
62 CE I Chip Enable Pin
63 CLK I Synchronization Clock
64 DI I Transfer Data Pin

Note 1:

When INH

= "LOW" : Serial data trensfers can be performed when the display is forcibly OFF.

(No.49825)1-27

KS-FX621

4.7 RPM6938-SV4 (IC652) : Remote sensor

• Pin diagram

1 2 3

• Block diagram

AGC

AMP

I/V
conversion

PD

magnetic shield

BPF

fo
trimming
circuit

Detector

4.8 LB1641 (IC402) : DC motor driver

• Pin layout • Truth table

GND

OUT1

P1

VZ
IN1
IN2

VCC1
VCC2

P2

OUT2

1
2
3
4
5
6
7
8
9

10

Input Output Mode

IN1 IN2 OUT1 OUT2

0000 Brake
1010 CLOCKWISE
0 1 0 1 COUNTER-CLOCKWISE
1100 Brake

Vcc

Comp

Vcc

22k

Rout

GND

1-28 (No.49825)

4.9 TEA6320T-X (IC161) : E.volume

•Pin layout

SDA

1

GND

TL
B2L
B1L

IVL

ILL

QSL

IDL

MUTE

ICL

IMD

IBL
IAL

2
3
4
5
6
7
8

9
10
11
12
13
14
15
16

CD-CH

TAPE

TUNER

OUTLR

OUTLF

• 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

KS-FX621

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

0 to -55dB
BALANCE

FENDER FRONT

VOLUME 2

0 to -55dB

BALANCE

FENDER REAR

29

30

Pin No. 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 Vre f - 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.49825)1-29

KS-FX621

4.10 AN80T05 (IC901) : Regulator

• Terminal layout & Block diagram

Reference Voltage

Thermal

Protection

ASO & Peak

Current Protection

Pre

Drive

Pre

Drive

AMP

Out

AMP

Out

Pre

Drive

123456789101112

ILL

10V

MODE2 MODE1 STB VDD

5.6V

AMP VCC ANT COM

• Pin function
Pin No. Symbol Function

1 ILL 10V power supply for illumination.
2 MODE2 When 5V is input,becomes AM. and the antenna output is turned on.
3 MODE1 When 5V is input,becomes AM. and the output of FM is switched.
4 STB When 5V is input outputs to ILL,COM,and AMP. It is 0V usually.
5 VDD 5.6V power supply.
6 AMP Power supply supply to remote amplifier
7 VCC Back up. conn ects with ACC with it.
8 ANT Psower supply supply to auto antenna.

9 COM 8.7V power supply.
10 AM The power supply of 8.7V to AM.
11 FM The power supply of 8.7V to FM.
12 GND Ground

Pre

Drive

8.7VAM8.7VFM8.7V

Pre

Drive

GND

1-30 (No.49825)

KS-FX621

(No.49825)1-31

KS-FX621

VICTOR COMPANY OF JAPAN, LIMITED

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

(No.49825)

Printed in Japan

200303WPC