Jvc Ks-fx473r User manual

SERVICE MANUAL

CASSETTE RECEIVER

No.49689

Feb. 2002

KS-FX473R/KS-FX470R

Area Suffix

E

EX

Continental Europe

Central Europe

Contents

Safety precaution

Disassembly method

Adjustment method

Description of major ICs

1- 2

1- 3

1-13

1-16~24

Different pont Illumination

KS-FX473R Amber

KS-FX470R Green

KS-FX473R

KS-FX470R

KS-FX473R

KS-FX470R

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TEL 13942296513 QQ 376315150 892498299

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KS-FX473R/KS-FX470R

1-2

!Burrs formed during molding may be left over on some parts of the chassis. Therefore,

pay attention to such burrs in the case of preforming repair of this system.

Safety precaution

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KS-FX473R/KS-FX470R

1-3

Press the eject button in the lower right part of the

front panel. Remove the front panel assembly from

the body.

1.

Removing the front panel assembly

(See Fig.1)

Prior to performing the following procedure, remove

the front panel assembly.

Release the four joint tabs aon both sides of the

front chassis assembly and remove the front chassis

assembly toward the front.

1.

Removing the front chassis assembly

(See Fig.2 and 3)

Disassembly method

Fig.1

Fig.2

Fig.3

Front panel assembly

Eject button

Tab a

Front chassis assembly

Front chassis

assembly

Heat sink Tab a

Tab a

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KS-FX473R/KS-FX470R

1-4

Remove the three screws Aon the left side of the

body.

1.

Removing the heat sink (See Fig.4)

Prior to performing the following procedure, remove

the front panel assembly, the front chassis assembly

and the heat sink.

Turn over the body and unjoint the five joints bwith

the bottom cover and the body using a screwdriver.

1.

Removing the bottom cover

(See Fig.5 and 6)

Fig.4

Fig.5

Fig.6

Heat sink

AA

Joints b

Joint b

Joints b

Joint b

Bottom cover

Rear panel

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KS-FX473R/KS-FX470R

1-5

Prior to performing the following procedure, remove

the front panel assembly, the front chassis assembly,

the heat sink and the bottom cover.

Remove the screw B, the two screws C and the two

screws Dattaching the rear bracket on the back of

the body. Remove the rear bracket.

Remove the two screws Eattaching the main board

on the bottom of the body. Disconnect connector

CN901 and CN902 on the main board in the

direction of the arrow.

1.

2.

Removing the main board

(See Fig.7 and 8)

Prior to performing the following procedure, remove

the front panel assembly, the front chassis assembly,

the heat sink, the bottom cover and the main board.

Remove the four screws Fattaching the cassette

mechanism section on the back of the top chassis.

1.

Removing the cassette mechanism section

(See Fig.9)

Fig.7

Fig.8

Fig.9

Rear bracket

B

D

C

Main board

E

CN902

CN901

Cassette mechanism section

F

FF

Top chassis

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KS-FX473R/KS-FX470R

1-6

Prior to performing the following procedure, remove

the cassette mechanism section.

Disconnect the wire from connector CJ901 on the

head amplifier board.

Remove the screw G and slide the head amplifier

board in the direction of the arrow to unjoint the two

joints cwith the mechanism bracket.

1.

2.

Removing the head amplifier board

(See Fig.10)

Prior to performing the following procedure, remove

the cassette mechanism section.

Disconnect the wire from connector CJ902 on the

motor board.

Remove the screw Hand slide the motor board in

the direction of the arrow to unjoint the joint dwith

the mechanism bracket.

1.

2.

Removing the motor board (See Fig.11)

Prior to performing the following procedure, remove

the cassette mechanism section, the head amplifier

board and the motor board.

Remove the four screws Ion the bottom of the

cassette mechanism section.

1.

Removing the cassette mechanism assembly

(See Fig.12)

Fig.10

Fig.11

Fig.12

G

Joint c

Head amplifier board

CJ901

Motor board

CJ902

Joint d

H

Mechanism bracket

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KS-FX473R/KS-FX470R

1-7

Prior to performing the following procedure, remove

the front panel assembly.

Remove the four screws Jattaching the rear cover

on the back of the front panel assembly.

Unjoint the nine joints ewith the front panel and the

rear cover.

Remove the control switch board on the back of the

front panel.

1.

2.

3.

Removing the control switch board

(See Fig.13 to 15)

Fig.13

Fig.14

Fig.15

J

JJ

J

Rear cover

Joints e

Front panel

Rear cover

Control switch board

Front panel

Joints e

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KS-FX473R/KS-FX470R

1-8

Prior to performing the following procedures, remove

the head amplifier board, the relay board and the

mechanism bracket.

Unsolder the three wires aon the direction switch

board.

Remove the one screw Aattaching the direction

switch board.

1.

2.

Removing the direction switch board

(See Fig.1)

Remove the screw Battaching the FF / REW lever

assembly on the back of the cassette mechanism

assembly.

Remove the screw Con the upper side of the FF /

REW lever assembly.

Lift and pull forward the FF / REW lever assembly to

disengage the joints b, c, dand e.

1.

2.

3.

Removing the FF / REW lever assembly

(See Fig.1)

Reattach the FF / REW lever assembly to the joint c

on the back of the chassis.

Reattach the pinch-roller shaft e, the change lever d

and the return link eto the chassis.

1.

2.

Reattaching the FF / REW lever assembly

(See Fig.1)

C

FF / REW lever assembly

Joint c

Joint b

B

A

Direction switch board

Joint d

Joint e

Soldering a

Fig.1

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KS-FX473R/KS-FX470R

1-9

Prior to performing the following procedure, remove

the direction switch board and the FF / REW lever

assembly.

Remove the screw Dattaching the playback head.

Remove the C washer and pull out the FF roller.

Remove the S support plate, the A arm spring (a)

and (b), the playback head.

1.

2.

3.

Removing the playback head (See Fig.2)

The A arm spring (a) differs from the A

arm spring (b).

ATTENTION:

Prior to performing the following procedure, remove

the direction switch board and the FF / REW lever

assembly.

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

assembly from the chassis.

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

assembly from the chassis.

Draw out the pinch roller (F) and (R) assembly from

the shaft.

1.

2.

3.

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

assembly (See Fig.2)

The P arm spring (f) differs from the P

arm spring (r).

ATTENTION:

The pinch roller (F) assembly differs

from the pinch roller (R) assembly.

ATTENTION:

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

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

Shaft Shaft

S support plate

D

C washer

P arm spring (f)

P arm spring (r)

Remove the P arm spring (f)

from the chassis.

Remove the P arm spring (r)

from the chassis.

Playback head

FF roller

Fig.2

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KS-FX473R/KS-FX470R

1-10

Prior to performing the following procedure, remove

the FF / REW lever assembly.

From the rear of the unit, bend the two tabs f

outwards and disengage the two joints gin the

direction of the arrow.

Push the eject lever and remove the cassette holder

from the playback head. Disengage the two joints h

of the cassette hanger / cassette holder and the eject

lever in the direction of the arrow.

Lift the cassette hanger / cassette holder and disengage

the joint iof the return link and the eject lever.

1.

2.

3.

Removing the cassette hanger / cassette

holder (See Fig.3)

Unsolder the two wires jon the motor assembly.1.

Turn over the cassette mechanism assembly and

remove the main belt and the sub-belt from the

motor pulley.

2.

Remove the two screws Gattaching the motor

assembly.

3.

Removing the motor assembly

(See Fig.5)

To replace the sub-belt, remove the

main belt and the sub-belt from the

motor pulley. Then remove the three

screws Eand one screw F. Replace

with a new sub-belt while lifting the reel

base assembly slightly.

ATTENTION:

Prior to performing the following procedure, remove

the FF / REW lever assembly and the cassette

hanger / cassette holder.

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

Removing the reel disc assembly

(See Fig.4)

Replace with a new C washer when

reattaching.

ATTENTION:

The main belt can now be removed.

ATTENTION:

Cassette holder

Cassette hanger

Return link

Joint i

Eject lever

Joint h

Joint g

Joint g Tab f

Tab f

Reel disc assembly

Flywheel (BF)

Flywheel (BR)

E

F

G

Main-belt

Reel base assembly

Sub-belt

Motor assembly

Motor pulley

Soldering j

Fig.3

Fig.4

Fig.5

C washer

Chassis

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KS-FX473R/KS-FX470R

1-11

Raise the part kof the reel base assembly slightly

and remove the selector link (B) on the front side of

the cassette mechanism assembly by turning it as

shown in Fig.10.

Remove the three screws Eand the one screw F

on the underside of the cassette mechanism

assembly.

1.

2.

Removing the reel base assembly

(See Fig.5 and 6)

Prior to performing the following procedure, remove

the cassette hanger / cassette holder.

From the upper side of the cassette mechanism

assembly, remove the C washer from each shaft of

the flywheel (BF) and (BR).

Turn over the cassette mechanism assembly and

remove the main belt. Pull out the flywheel (BF) and

(BR) downward respectively.

1.

2.

Removing the Flywheel (BF) and (BR)

assembly (See Fig.4 and 5)

The reel base assembly is not

repairable. Handle with care.

ATTENTION:

Selector link (B).

Inside of the reel base assembly

Reel disc assembly

Flywheel (BF)

Flywheel (BR)

E

F

G

Main-belt

Reel base assembly

Sub-belt

Motor assembly

Motor pulley

Soldering j

Fig.4

Fig.5

Fig.6Fig.7

C washer

Pinch-roller (R) assembly

Turn the selector link (B).

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KS-FX473R/KS-FX470R

1-12

Unsolder the two wires lon the mute switch board on

the back of the cassette mechanism assembly.

Remove the screw Hattaching the mute switch

board.

1.

2.

Removing the mute switch board

(See Fig.8)

Prior to performing the following procedure, remove

the motor assembly.

Unsolder the two wires mon the power switch on the

side of the cassette mechanism assembly.

Remove the screw Iattaching the power switch.

1.

2.

Removing the power switch (See Fig.9)

Cassette mechanism assembly

Soldering l

HMute

switch board

Soldering m

IPower switch

Cassette mechanism assembly

Rower switch

Motor assembly

Fig.8

Fig.9

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KS-FX473R/KS-FX470R

1-13

AM mode 999kHz/62dB,INT/400Hz,30%

modulation signal on recieving.

FM mono mode

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

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

97.9MHz/66dB,INT/400Hz,22.5kHz

deviation pilot off mono

Frequenc

Band

Adjustment method

Test instruments reqired for adjustment Standard volume position

Measuring conditions(Amplifier section)

Frequency band

1. Digital oscilloscoe(100MHz)

2.Frequency counter meter

3.Electric voltmeter

4.Wow & flutter meter

5.Test tapes

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

(Mechanism adjustment)

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

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

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

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

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

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

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

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.

FM: 87.5 MHz to 108.0 MHz

AM : 522 kHz to 1620 kHz(MW)

144 kHz to 279 kHz(LW)

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KS-FX473R/KS-FX470R

1-14

Extension cord

: EXTKSRT002-6P

EXTKSRT002-6P

Front panel assembly

Main board

Cassette mechanism

Information for using a car audio service jig

1. For 1995 and 1996 , we're advancing efforts to make our extension cords common for all car audio products.

Please use this type of extension cord as follows.

2. As a U-shape type top cover is employed, this type of extension cord is needed to check operation of the

mechanism assembly after disassembly.

3. Extension cord : EXTKSRT002-6P ( 6 pin extension cord ) For connection between mechanism assembly

and main board assembly.

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

Disassembly methodl

1. Remove the bottom cover.

2. Remove the front panel assembly.

3. Remove the top cover .

4. Install the front panel.

5. Confirm that current is being carried by connecting

an extension cord jig.

Note

Available to connect to the CN701 connector when in-

stalling the front panel.

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KS-FX473R/KS-FX470R

1-15

Head section view

Head azimuth screw

Cassette mechanism

(Surface)

Tape speed adjust

Motor assembly

Fixed screw

Height adjusting screw

c

Height adjusting screw

b

Height adjusting screw

a

Playback head

Azimuth screw

Arrangement of adjusting & test points

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KS-FX473R/KS-FX470R

1-16

Mechanism adjustment section

Item Adjusting & Confirmation Methods Adjust Std. Value

"Head Height Adjustment"

Note

Adjust the azimuth directly. When you adjust the height us-

ing a mirror tape, remove the cassette housing from the

mechanism chassis.

After installing the cassette housing, perform the azimuth

adjustment.

1.Load the mirror tape ( SCC-1659 ). 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 the azimuth screw (b) so that line "B" of the mirror

tape runs in the center between Lch and Rch in the forward

play mode.

"Head Azimuth Adjustment"

1.Load the test tape ( VT724: 1kHz ) and play it back in the

reverse play mode. set the Rch output level to maximum.

2.Load the test tape ( VT703: 10kHz ) and play it back in the

forward play mode. Adjust the Rch and Lch output levels

to maximum, with azimuth adjustment screw (b).

In this case, the phase difference should be within 45 .

3.Engage the reverse mode and adjust the output level to

maximum, 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 Lch and Rch, REV Lch and Rch.

5.When the test tape ( VT721 : 315Hz ) is played back, the

level difference between channels should be within 1.5dB.

1.Check to see if the reading of the frequency counter & Wow

flutter meter is within 2940-3090 Hz( 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 the test tape ( VT724 : 1kHz ) back and set the volume

position at 2V.

2.Play the test tape ( VT739 )back and confirm 0 +3dB at1kHz/

-

8kHz and -4+2dB at 1kHz/125Hz.

3.When 8kHz is out of specification, it will be necessary to

readjust the azimuth.

Head shield

The head is at low position

during FWD.

The head is at height position

during REV.

A Line

B Line

Phase

screw (c) screw (a)

screw (b)

Head azimuth

screw Fixed screw

045

Built-in

volume resistor Tape Speed

2940-3090Hz

Wow&Flutter

Less than

0.35%

(JIS RMS)

Speaker out

1kHz/8kHz

: 0dB_}3dB,

125Hz/1kHz

: -4dB+2dB,

1.Head azimuth

2.Tape Speed and

Wow & Flutter

3.Playback

Frequency

response

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

5

1

5

0

9

2

8

9

4

2

9

8

T

E

L

1

3

9

4

2

9

6

5

1

3

9

2

8

9

4

2

9

8

0

5

1

5

1

3

6

7

3

Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

KS-FX473R/KS-FX470R

1-17

AN80T05LF (IC961) : Regulator

1.Terminal layout & Block diagram

2.Pin function

Pre

Drive

Thermal

Protection

Reference Voltage

Pre

Drive

AMP

Out

ASO & Peak

Current Protection

AMP

Out

Pre

Drive Pre

Drive

1 2 3 4 5 6 7 8 9 10 11 12

ILL

10V MODE2 MODE1 STB VDD

5.6V AMP VCC ANT COM

8.7V AM

8.7V FM

8.7V GND

1

2

3

4

5

6

7

8

9

10

11

12

ILL

MODE2

MODE1

STB

VDD

AMP

VCC

ANT

COM

AM

FM

GND

10V power supply for illumination.

When 5V is input,becomes AM. and the antenna output is turned on.

When 5V is input,becomes AM. and the output of FM is switched.

When 5V is input, outputs to ILL,COM,and AMP. It is 0V usually.

5.6V power supply.

Power supply supply to remote amplifier

Back up. connects with ACC with it.

Power supply supply to auto antenna.

8.7V power supply.

The power supply of 8.7V to AM.

The power supply of 8.7V to FM.

Ground

No.

Symbol Function

Description of major ICs

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

5

1

5

0

9

2

8

9

4

2

9

8

T

E

L

1

3

9

4

2

9

6

5

1

3

9

2

8

9

4

2

9

8

0

5

1

5

1

3

6

7

3

Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

KS-FX473R/KS-FX470R

1-18

Pin No. Port Name I/O Descriptions

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

KEY 0

KEY 1

KEY 2

LEVEL

SM

SQ

LCDCE

LCDDA

LCDSCK

BUSI/O

UNLOCK

BUSSI

BUSSO

BUSSCK

NC

GNDPORT

VDDPORT

AM

AFCK

MONO

FM

SEEK/STOP

NC

IFC

VDDPLL

FMOSC

AMOSC

GNDPLL

AMEO

FMEO

IC

SD/ST

STAGE0

NC

F/R

I

O

I

-

I

O

I/O

-

O

-

I

-

I

-

O

-

I

-

O

Key input 0

Key input 1

Key input 2

Level meter input

S.meter level input

S.Quality level input

CE output to LCD driver

Data output to LCD driver

Clock output to LCD driver

I/O selector output for J-BUS, H : OUT, L: INPUT

Non connect

J-BUS Data input

J-BUS Data output

J-BUS Clock in/output

Non connect

Port GND

Port Vdd

Non connect

AF check output, L: AF check

Monaural on /off selecting output, H:mono on

FM/AM switching output L : FM H : AM

Auto seek /stop selecting output, H: Seek, L:Stop

Non connect

FM/AM midle frequency counter input

PLL Vdd

FM/AM limited generator frequency input

None connect

PLL GND

AM error out output

FM error out output

GND

Station detector, Stereo signal input, H:Find Station, L:Stereo

Pull up

Non connect

Main motor output

UPD178018AGC555 (IC701) : CPU

1. Pin layout

2. Pin function

1

20

60

41

21 ~ 40

80 ~ 61

~

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

5

1

5

0

9

2

8

9

4

2

9

8

T

E

L

1

3

9

4

2

9

6

5

1

3

9

2

8

9

4

2

9

8

0

5

1

5

1

3

6

7

3

Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

KS-FX473R/KS-FX470R

1-19

Pin No. Port Name I/O Descriptions

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

NC

TELMUTE

TAPEIN

I2CCLK

I2CDAO

I2CDAI

NC

T-MUTE

NC

TAPE

TUNER

CD

NC

MUTE

POWER

NC

ON

STOP

RDSCK

RDSDA

REMOCON

DETACH

BUSINT

REGCPU

GND

X2

X1

REGOSC

VDD

NC

-

O

I

O

I

-

I

-

O

-

I

O

I

-

I

-

Non connect

Telephone mute signal detection input

TAPE input

I2C information clock output

I2C information data output

I2C information clock input

Non connect

Telephone mute signal detection input

Non connect

Mute output

Power ON /OFF switching output , H : power on

Non connect

CPU power supply

STOP signal output terminal

Clock input for RDS

RDS data input

Remocom input

Detach signal input H : Power save

Cut-in input for J-BUS signal

Regulator for CPU power supply, Connect the GND with 0.1 F.

Ground

Connecting the crystal oscillator for system clock

Regulator for oscillator circuit.Connect the GND with 0.1 F.

Vdd

Pull up

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

5

1

5

0

9

2

8

9

4

2

9

8

T

E

L

1

3

9

4

2

9

6

5

1

3

9

2

8

9

4

2

9

8

0

5

1

5

1

3

6

7

3

Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

KS-FX473R/KS-FX470R

1-20

ANTI-

ALIASING

FILTER

CLOCKED

COMPARATOR

COSTAS LOOP

VARIABLE AND

FIXED DIVIDER

57 kHz

BANDPASS

(8th ORDER)

RECONSTRUCTION

FILTER

OSCILATOR

AND

DIVIDER

BIPHASE

SYMBOL

DECODER

TEST LOGIC AND OUTPUT

SELECTOR SWITCH

CLOCK

REGERATION

AND SYNC

REFERENCE

VOLTAGE

DIFFERENTIAL

DECODER

QUALITY BIT

GENERATOR

8

4

7

5VP1

3

6 11

15

2

1

121413

910

SAA6579T-X(IC761):RDS

1.Pin layout

2.Block diagram

3.Pin function

QUAL

RDDA

Vref

MUX

V

ODA

V

SSA

CIN

SCOUT

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

RDCL

T57

OSCO

OSCI

V

0DD

V

SSD

TEST

MODE

Symbol

QUAL

RDDA

Vref

MUX

VDDA

VSSA

CIN

SCOUT

MODE

TEST

VSSD

VDDD

OSCI

OSCO

T57

RDCL

Pin No.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

Description

Quality indication output

RDS data output

Reference voltage output (0.5VDDA)

Multiolex signal input

+5V supply voltage for analog part

Ground for analog part (0V)

Subcarrier input to comparator

Subcarrier output of reconstruction filter

Oscllator mode / test control input

Test enable input

Ground for digital part (0V)

+5V supply voltage for digital part

Oscillator input

Oscillator output

57 kHz clock signal output

RDS clock output

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

5

1

5

0

9

2

8

9

4

2

9

8

T

E

L

1

3

9

4

2

9

6

5

1

3

9

2

8

9

4

2

9

8

0

5

1

5

1

3

6

7

3

Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

JVC KS-FX473R User manual

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