JVC KD-SX950 Manual de usuario

SERVICE MANUAL

CD RECEIVER

No.49539

Feb. 2000

This service manual is made from 100% redycled paper.

Printed in Japan

200002(V)

VICTOR COMPANY OF JAPAN, LIMITED

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

KD-SX950

(No.49539)

KD-SX950

Area Suffix

J ---- Northerm America

Contents

Safety precaution  1-2

Instructions 1-3~16

Disassembly method 2-1

Adjustment method 2-6

Flow of functional operation

until TOC read  2-7

Maintenance of laser pickup 2-9

Description of major ICs 2-10

Block diagram  2-26

Standard schematic diagrams 2-27

Printed circuit boards 2-29~31

Parts list 3-1~

DISP

SCM

RPT

SSM

BBE

RND

789

CD CHANGER CONTROL

10 11 12

INT

-CH

FM/AM

ATT

SCAN

!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.

Safety precaution

!CAUTION Please use enough caution not to see the beam directly or touch it in case of an

adjustment or operation check.

Disasembly method

Removing the front panel unit

1.Press the Eject button to open the front panel unit

(See fig 1)

2.Push and open the right and left open/close shaft arms

outward to remove the shaft.(See fig 2)

3.Remove the front panel unit from the same side as the

shaft was removed.

1.Remove the front panel unit.

2.Remove the two screwsAbsecuring the front chassis

assembly.(See fig 3)

3.Remove the four ribsaasecuring the front chassis

assembly to the chassis.(See fig 4)

Removing the front chassis assembly

Removing the bottom cover assembly

Turn the unit upside down,then insert and turn to

b the screwdriver to remove the bottom cover.

(See fig 5)

Fig 5

Fig 1

Eject button

Front panel unit

Fig 2

Open/close

shaft arm

Fig 3 A

Fig 4 a

1.Remove three screws Eretaining the rear panel to the

chassis

2.Remove one screw Cretaining the IC to the heat sink.

3.Remove two screws Dretaining the main bord.

4.Lift up the main board to remove it.

5.Remove two screws Bto remove the heat sink.

Removing the rear brackt (See fig7)

1.Remove one screw I to remove the IC bracket.

2.Remove one screw Fto remove the line-out jack.

3.Remove one screw G to remove the antenna jack.

4.Remove one screw Hto remove the connector.

5.Remove one screw Lto remove the connector.

CD mechanism assembly (See fig8)

Remove three mechanism mounting screws Jretaining the

top cover.

Front panel unit (See fig9)

Remove five screws Kretaining the rear cover.

Removing the main board(wiht rear panel)

(See fig6.7)

Fig 9

Fig 8

Fig 6

KKK

Fig 7

LLHF

Unsolder the part f and g on the CD mechanism

control board.

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.

Disconnect the flexible wire from connector on the

pickup unit.

Removing the CD mechanism control

board(See Fig.1 and 2)

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.2).

ATTENTION:

Fig.1

Fig.2

Fig.3

Fig.4

Front bracket

CD mechanism

control board

Shift the lock

Flexible wire

Pickup unit

FD gear

CD mechanism control board

Loading motor Front bracket

Front bracket Pull outward

Pull outward

Flame

Damper bracket

CD mechanism ass’y

Prior to performing the following procedure, remove

the CD mechanism control board.

Remove the two springs k attaching the CD mechanism

ass’y and the front bracket.

Remove the two screws G and the front bracket

while pulling the flame outward.

Remove the belt and the screw H from the loading

motor.

Removing the loading motor

(See Fig.3 to 5)

Prior to performing the following procedure, remove

the CD mechanism control PWB and the front

bracket (loading motor).

Remove the three screws I and the damper bracket.

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.8 and 9.

Remove the CD mechanism ass’y and the two

springs m attaching the flame.

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.

Removing the CD mechanism ass’y

(See Fig.1, 6 to 9)

The CD mechanism ass’y can be

removed if only the rear damper

bracket on the left side is removed.

ATTENTION:

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

Rear damper bracket

Fix arm (R)

Damper

Loading motor

Belt

Damper bracket

CD mechanism ass’y

Flame

Fix plate (L)

Rear damper bracket

Fix arm (L)

Damper

Fix plate(R)

Prior to performing the following procedure, remove

the CD mechanism control board, the front bracket

(loading motor) and the CD mechanism ass’y.

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

Removing the feed motor ass’y

(See Fig.10)

*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.

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.

Remove the screw L attaching the nut push spring

plate and the pickup mount nut from the pickup unit.

Pull out the FD screw.

Removing the pickup unit

(See Fig.10 and 11)

When reattaching the pickuap unit,

reattach the part o of the pickup unit,

then the part n of the FD screw.

ATTENTION:

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.

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.

Turn the turn table, and remove the two screws M

and the spindle motor.

Removing the spindle motor

(See Fig.12 and 13)

Fig.10

Fig.11

Fig.12

Fig.13

Spindle motor

Pickup unit

Part n

FD screw

Feed motor ass’y

FD gear Pickup unit

Part O

Nut push spring plate

Pickup mount nut

Pickup unit

FD screw

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

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.

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

EXTGS004-26P

Power ON

 Set Function to CD

Play

Jump to the first track

TOC readout

Tracking loop closed

Disc rotates

Disc inserted

YES

Laser emitted

Pickup feed to the inner area

Focus search

RF signal eye-pattern

opens

RF signal eye-pattern

remains closed

"No disc"

display

• When correctly focused

 Focus Servo Loop ON

• When the laser diode correctly

emits

Microprocessor

commands

Rough Servo Mode

CLV Servo Mode

(ProgramArea)

CLV Servo Mode

(Lead-In Area;

Digital: 0)

• RF signal

Flow of functional operation until TOC read

• When the pickup correctly moves

to the inner area of the disc

TERMINAL

Microprocessor

commands

FMO

TC9462 "53"

FEED MOTOR

+TERMINAL

IC581 "5"

REST SW

• When the disc correctly rotates

Tracking Servo Loop ON

Servo CLV

Rough

Servo

AccelerationAcceleration

Microprocessor

commands

Spindle

motor (-)

IC581 "7"

0.5 Sec 0.5 Sec

Feed Section

Focus Section

Tracking Section

Spindle Section

Is the voltage output at

IC521 pin "53" 5V or 0V?

Check the feed motor.

Is 4V present at both

sides of the feed motor?

Is the wiring for IC521

(90) ~ (100) correct?

Check IC581.

Is 6V or 2V present at

IC581 "5" and "6"?

Is 5V present at IC581

pin "11"?

Check the feed motor

connection wiring.

Check the vicinity of

IC521.

Check CD 9V

and 5V.

YES

NONO

YES

When the lens is

moving:

Check the circuits in

the vicinity of IC581

pins "15" ~ "18".

Check the pickup and

its connections.

YES

Does the S-search

waveform appear at

IC581 pins "17" and "18"?

Is the disk rotated?

Does the RF signal

appear at TP1?

Is 4V present at IC581

pins "7" and "8" ?

Check the spindle motor

and its wiring.

Is 4V present at IC521

pin "55" ?

Check the vicinity of

IC581.

Check IC501 and

IC521.

YES

NO NO

YES

Check the circuits in the

vicinity of IC501 "19" ~

"24" or the pickup

Is the RF waveform at TP1

distorted?

Proceed to the Tracking

section

When the disc is rotated

at first:

Check the circuit in the

vicinity of IC501 pins

"2" ~ "12".

Check IC521.

Check the pickup and

its connections.

YESYES

YES

Is the tracking error signal

output at IC501 "12"?

Approx. 1.2 V

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