JVC KD-S550 Service Manual

KD-S550 / KD-S600

COMPACT

DIGITAL AUDIO

KD-S550 / KD-S600

SERVICE MANUAL

CD RECEIVER

KD-S550 / KD-S600

Contents

Area Suffix

ATT

BAND PROG

DISC

FUNC

DISC

PRESET

Model

Remote

control unit

J ---- Northerm America E ---- Continental Europe

KD-S550 KD-S600

VICTOR COMPANY OF JAPAN, LIMITED

MOBILE ELECTRONICS DIVISION,10-1,1Chome,Ohwatari-machi,maebashi-city,Japan

(No.49524)

Printed in Japan 9912(V)

Safety precaution  1-2 Instructions 1-3 - 13 Location of main parts 2-1 Disassembly method 2-2 Adjustment method 2-7 Flow of functional operation until TOC read  2-8

This service manual is made from 100% redycled paper.

Maintenance of laser pickup 2-10 Description of major ICs 2-11

Block diagram  2-23 Standard schematic diagrams 2-24 Printed circuit board 2-27 - 28 Parts list 3-1 - 11

No.49524

Dec. 1999

Safety precaution

CAUTION

!

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.

Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check.

Location of main parts

Control unit

Display

LED & key control board

Main uni

CD mechanism

t

Main board

Mechanism relay board

Power IC

ISO connector

Main board

Loading motor

Antenna jack

Tuner

pack

Connector to controller

Damper

Optical pick up unit

Spindle motor

Feed motor

Damper

Disassembly method

Removing the front panel unit

(See Fig.1)

1. Press the release switch and remove the front panel unit in the direction of the arrow.

Fig.1

Removing the front chassis (See Fig.2)

1. Insert a screwdriver to the joints a on the side of the front chassis and two joints b on the right side, then detach the front chassis toward the front side.

Removing the heat sink (See Fig.3)

1. Remove the three screws A attaching the heat sink on the left side of the body, and remove the heat sink.

A

a

Front chassis

A

b

Fig.2

A

Heat sink

Fig. 3

Removing the bottom cover (See Fig.4)

1.2.Turn the body upside down.

Insert a screwdriver to the two joints c and two joints d on both sides of the body and the joint e on the back of the body, then detach the bottom cover from the body.

c

Regulator board

d

e

Fig. 4

Removing the main amplifier board

(See Fig.5 and 6)

1.

Remove the front chassis.

2.

Remove the bottom cover.

3.

Remove the two screws B attaching the main amplifier board assembly on the bottom of the body.

Main amplifier board

CN501

4.

Remove the three screws C attaching the main amplifier board assembly on the back of the body.

5.

Disconnect connector CN501 on the main amplifier board assembly from the CD mechanism assembly.

Removing the CD mechanism assembly

(See Fig.7)

1.

Remove the front chassis.

2.

Remove the bottom cover.

3.

Remove the main amplifier board assembly.

4.

Remove the three screws D attaching the CD mechanism assembly from the top cover.

B

C

CD mechanism assembly

Fop cover

B

Fig.5

C

Fig. 6

D

Removing the control switch board

(See Fig.8 and 9)

1.

Remove the front chassis.

2.

Remove the four screws E attaching the rear cover on the back of the front panel unit.

3.

Remove the control switch board from the front panel unit.

E

D

Fig. 7

E

Fig. 8

Control switch board

Fig. 9

D

E

* Prior to disassembling the CD mechanism, remove the following parts.

CD mechanism ass’y

m

Damper bracket

I

f

m

* The front panel unit and the front chassis (Refer to Fig.1 and 2)

* The heat sink (Refer to Fig.3)

* The bottom cover (Refer to Fig.4)

* The main amplifier board (Refer to Fig.5 and 6)

* The CD mechanism ass’y (Refer to Fig.7)

Removing the CD mechanism control board(See Fig.10 and 11)

1.

Unsolder the part f and g on the CD mechanism control board.

2.

Remove the stator fixing the CD mechanism control board and the damper bracket (To remove the stator smoothly, pick up the center part).

Remove the screw F attaching the CD mechanism control board.

Remove the CD mechanism control board in the direction of the arrow while releasing it from the two damper bracket slots i and the front bracket slot j.

Front bracket

FD gear

g

F

Fig.10

Pickup unit

Fig.11

CD mechanism control board

j

Flexible wire

h

I

i

CD mechanism control board

Shift the lock

Disconnect the flexible wire from connector on the pickup unit.

ATTENTION:

Turn the FD gear in the direction of the arrow to move the entire pickup unit to the appropriate position where the flexible wire of the CD mechanism unit can be disconnected easily (Refer to Fig.11).

k

G

Loading motor

Pull outward

Flame

Front bracket

Fig.12

Front bracket

Fig.13

k

G

Pull outward

Removing the loading motor

(See Fig.12 to 14)

* Prior to performing the following procedure, remove the CD mechanism control board.

1.

Remove the two springs k attaching the CD mechanism ass’y and the front bracket.

Loading motor

H

Belt

2.

Remove the two screws G and the front bracket while pulling the flame outward.

3.

Remove the belt and the screw H from the loading motor.

Removing the CD mechanism ass’y

(See Fig.10, 15 to 18)

* Prior to performing the following procedure, remove the CD mechanism control PWB and the front bracket (loading motor).

1.

Remove the three screws I and the damper bracket.

2.

Raise the both sides fix arms and move the fix plates in the direction of the arrow to place the four shafts l as shown in Fig.17 and 18.

3.

Remove the CD mechanism ass’y and the two springs m attaching the flame.

CD mechanism ass’y

I

Flame

Fix plate (L)

Fig.14

Damper bracket

m

I

Fig.15

I

Fig.16

Rear damper bracket

Fix arm (L)

J

4.

Remove the two screws J and both sides rear damper brackets from the dampers. Detach the CD mechanism ass’y from the left side to the right side.

ATTENTION:

The CD mechanism ass’y can be removed if only the rear damper bracket on the left side is removed.

l

Fix arm (R)

Damper

l

Fig.17

Rear damper bracket

J

l

Fig.18

Damper

Fix plate(R)

l

Removing the feed motor ass’y

(See Fig.19)

* Prior to performing the following procedure, remove the CD mechanism control board, the front bracket (loading motor) and the CD mechanism ass’y.

1.

Remove the two screws K and the feed motor ass’y.

K

FD screw

Feed motor ass’y

Part n

Part O

Pickup unit

Removing the pickup unit

(See Fig.19 and 20)

* Prior to performing the following procedure, remove the CD mechanism control board, the front bracket (loading motor), the CD mechanism ass’y and the feed motor ass’y.

1.

Detach the FD gear part of the pickup unit upward. Then remove the pickup unit while pulling out the part n of the FD screw.

ATTENTION:

2.

Remove the screw L attaching the nut push spring plate and the pickup mount nut from the pickup unit. Pull out the FD screw.

When reattaching the pickuap unit, reattach the part o of the pickup unit, then the part n of the FD screw.

FD gear

Nut push spring plate

FD screw

Pickup unit

Fig.19

L

Pickup mount nut

Pickup unit

Fig.20

Removing the spindle motor

(See Fig.21 and 22)

* Prior to performing the following procedure, remove the CD mechanism control board, the front bracket (loading motor), the CD mechanism ass’y and the feed motor ass’y.

1.

Turn up the CD mechanism ass’y and remove the two springs p on both sides of the clamper arms. Open the clamper arm upward.

2.

Turn the turn table, and remove the two screws M and the spindle motor.

p

Fig.21

Spindle motor

M

p

M

Fig.22

Adjustment method

Test instruments required for adjustment

1. Digital oscilloscope (100MHz)

2. AM Standard signal generator

3. FM Standard signal generator

4. Stereo modulator

5. Electric voltmeter

6. Digital tester

7. Tracking offset meter

8. Test Disc JVC :CTS-1000

9. Extension cable for check EXTGS004-26P 1

Standard measuring conditions Power supply voltage DC14.4V(10.5~16V) Load impedance 20Kohm(2 Speakers connection) Output Level  Line out 2.0V (Vol. MAX)

How to connect the extension cable for adjusting

Standard volume position Balance and Bass &Treble volume : lndication"0" Loudness : OFF BBE : OFF Frequency Band FM 87.5MHz ~ 108.0MHz MW 522kHz ~ 1620 kHz LW 144kHz ~ 279kHz

Dummy load Exclusive dummy load should be used for AM,and FM. For FM dummy load,there is a loss of 6dB between SSG output and antenna input.The loss of 6dB need not be considered since direct reading of figures are applied in this working standard.

EXTGS004-26P

Flow of functional operation until TOC read

Power ON

• When the pickup correctly moves to the inner area of the disc

 Set Function to CD

• When the laser diode correctly emits

Microprocessor

commands

FMO TC9462 "53"

FEED MOTOR +TERMINAL

TERMINAL

IC581 "5"

REST SW

• When correctly focused

 F ocus Servo Loop ON

Disc inserted

Pickup feed to the inner area

Laser emitted

Focus search

Disc rotates

RF signal eye-pattern remains closed

T racking loop closed

RF signal eye-pattern opens

TOC readout

YES

Microprocessor

commands

"No disc"

display

• When the disc correctly rotates

Microprocessor commands

Spindle motor (-) IC581 "7"

AccelerationAcceleration

0.5 Sec

Rough Servo

0.5 Sec

Servo CLV

Jump to the first track

Play

Tracking Servo Loop ON

• RF signal

Rough Servo Mode

CLV Servo Mode (ProgramArea)

CLV Servo Mode (Lead-In Area; Digital: 0)

Maintenance of laser pickup

(1) Cleaning the pick up lens Before you replace the pick up, please try to clean the lens with a alcohol soaked cotton swab.

(2) Life of the laser diode When the life of the laser diode has expired, the following symptoms will appear. (1) The level of RF output (EFM output:ampli tude of eye pattern) will be low.

Is RF output

1.0 0.35Vp-p?

YES

O.K

(3) Semi-fixed resistor on the APC PC board The semi-fixed resistor on the APC printed circuit board which is attached to the pickup is used to adjust the laser power.Since this adjustment should be performed to match the characteristics of the whole optical block, do not touch the semi-fixed resistor. If the laser power is lower than the specified value,the laser diode is almost worn out, and the laser pickup should be replaced. If the semi-fixed resistor is adjusted while the pickup is functioning normally,the laser pickup may be damaged due to excessive current.

NO

Replace it.

Replacement of laser pickup

Turn off the power switch and,disconnect the power cord from the ac outlet.

Replace the pickup with a normal one.(Refer to "Pickup Removal" on the previous page)

Plug the power cord in,and turn the power on. At this time,check that the laser emits for about 3seconds and the objective lens moves up and down. Note: Do not observe the laser beam directly.

Play a disc.

Check the eye-pattern at TP1.

Finish.

Description of major ICs

TEA6320T-X(IC301) : E.VOLUME

1.Terminal Layout

SDA

1

GND

2

OUTLR

OUTLF

MUTE

TL B2L B1L

IVL

ILL

QSL

IDL

ICL

IMD

IBL IAL

3 4 5 6 7 8

9 10 11 12 13 14 15 16

CD-CH

TAPE

TUNER

3.Pin Functions

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

2.Block Diagram

10 8 9 7 6

21 31

2

19

16 15 13 11

14

22 20 18 17

POWER SUPPLY

SOURCE

SELECTOR

23 25 24 26 27 28

VOLUME 1

+20 to -31 dB

LOUDNESS

LEFT

VOLUME 1

+20 to -31 dB

LOUDNESS

RIGHT

BASS LEFT

+15 dB

LOGIC

BASS RIGHT

+15 dB

5

TREBLE

LEFT

+12 dB

TREBLE

RIGHT +12 dB

12

MUTE

FUNCTION

ZERO CROSS

DETECTOR

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

Pin No.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

Symbol

SDA

GND

OUTLR

OUTLF

TL

B2L

B1L

IVL

ILL

QSL

IDL

MUTE

ICL

IMO

I/O

Serial data input/output.

I/O

Ground.

-

output left rear.

O

output left front.

O

Treble control capacitor left channel or

I

input from an external equalizer. Bass control capacitor leftchannel or

-

output to an external equalizer. Bass control capacitor left channel.

-

Input volume 1. left control part.

I

Input loudness. left control part.

I

Output source selector. left channel.

O

Not used

-

Not used

-

Input C left source.

I

Not used

-

Functions Functions

Pin No.

17

18

19

20

21

22

23

24

25

26

27

28

29

30

Symbol

IAR

IBR

CAP

ICR

Vref

IDR

QSR

ILR

IVR

B1R

B2R

TR

OUTRF

OUTRR

I/O

I

Input A right source.

I

Input B right source.

-

Electronic filtering for supply.

I

Input C right source.

-

Reference voltage (0.5Vcc)

-

Not used

O

Output source selector right channel.

I

Input loudness right channel.

I

Input volume 1. right control part.

-

Bass control capacitor right channel Bass control capacitor right channel or

O

output to an external equalizer. Treble control capacitor right channel or

I

input from an external equalizer. Output right front.

O

Output right rear.

O

15

16

IBL

IAL

Input B left source.

I

Input A left source.

I

31

32

Vcc

SCL

Supply voltage.

-

Serial clock input.

I

AN8806SB-W (IC501) : RF&Servo AMP

1.Pin layout

36

PD LD LDON LDP VCC

RF- RF OUT RF IN

C.AGC ARF C.ENV

C.EA

CS BDO

BDO CS BRT OFTR /NRFDET

GND

2.Block diagram

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16 17 18

35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19

PDAC PDBD PDF PDE PDER PDFR TBAL FBAL EF EF OUT TE- TE OUT CROSS TE BPF VDET LD OFF VREF ENV

6

36

-+

35

--

+

31

34

--

7 28

-+

+

VCBA

--

+

VCBA

--

VCBA

+

29

--

+

-+

27

-+

8

EQ

OFTR

9 10 17

AGC

BDO

RF DET

11

12 19

ENV CURCUIT

13

14

15

16

-+

20

+

32

33

-+

--

VCBA

+

--

-+

--

+

--

21

2

+

--

24 25

30

1 4

23

26

22

3