JVC KD-S6250 Manual de usuario

SERVICE MANUAL

CD RECEIVER

No.49666

Dec. 2001

KD-S6250 / KD-S580

KD-S6250/KD-S580

Area Suffix

J ------ Northern America

KD-S6250

KD-S580

SSM

KD-S6250

DIRECT TRACK ACCESS

MO RPT RND

MODE SCM

SSM

KD-S580

DIRECT TRACK ACCESS

MO RPT RND

MODE SCM

Contents

Safety precaution

Preventing static electricity

Disassembly method

Adjustment method

1-2

1-3

1-4

1-11

Flow of functional

operation unit TOC read

Maintenance of laser pickup

Replacement of laser pickup

Description of major ICs

1-12

1-14

1-15

Difference point

KD-S6250

KD-S580

Color

Silver

Metallic gray

Remocon

KD-S6250/KD-S580

1-4

Press the eject button in the lower right part of the

front panel. Remove the front panel assembly from

the body.

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.

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

KD-S6250/KD-S580

1-5

Remove the three screws Aon the left side of the

body.

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.

Removing the bottom cover

(See Fig.5 and 6)

Fig.4

Fig.5

Fig.6

Heat sink

Joints b

Joint b

Joints b

Joint b

Bottom cover

Rear panel

KD-S6250/KD-S580

1-6

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 four screws C and the

three screws Dattaching the rear bracket on the

back of the body. Remove the rear panel.

Remove the two screws Eattaching the main board

on the bottom of the body. Disconnect connector

CN501 on the main board in the direction of the

arrow.

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 three screws Fattaching the cassette

mechanism section on the back of the top chassis.

Removing the CD mechanism section

(See Fig.9)

Fig.7

Fig.8

Fig.9

Rear panel

Main board

CN501

CD mechanism section

Top chassis

KD-S6250/KD-S580

1-7

Prior to performing the following procedure, remove

the front panel assembly.

Remove the four screws Gattaching the rear cover

on the back of the front panel assembly.

Unjoint the eleven(KD-S625)or nine(KD-S580) joints

cwith the front panel and the rear cover.

Remove the control switch board on the back of the

front panel.

Removing the control switch board

(See Fig.10 to 12)

Fig.10

Fig.11

Fig.12

Rear cover

Joints c

Front panel

Rear cover

Front panel

Control switch board

Joints c

Front panel

Rear cover

Joints c

(KD-S6250)

(KD-S580)

KD-S6250/KD-S580

1-8

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

KD-S6250/KD-S580

1-9

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 m

Fix plate (L)

Rear damper bracket

Fix arm (L)

Damper

Fix plate(R)

KD-S6250/KD-S580

1-10

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

KD-S6250/KD-S580

1-11

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 ~ 107.9MHz

AM 530kHz ~ 1710 kHz

EXTGS004-26P

The cardboard is cut in a suitable size.

uses for the insulation stand of mechanism.

KD-S6250/KD-S580

1-12

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

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