JVC KD-SX870 Bedienungsanleitung

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

1-4

1-5

1-10

1-11

Maintenance of laser pickup ----------------------- 1-13

Replacement of laser pickup ---------------------- 1-13

Description of major ICs ---------------------------- 1-14

Contents

CD RECEIVER

SERVICE MANUAL

KD-SX870

KD-SX770

No.49595

Feb. 2001

Area Suffix

J ... Northern America

KD-SX870

KD-SX770

...

Location of main parts -------------------------------

Disassembly method --------------------------------

Adjustment method ----------------------------------

Flow of functional operation unit TOC read ----

1-3

Preventing static electricity -------------------------

KD-SX770

KD-SX870

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1-2

KD-SX870

KD-SX770

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.

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Preventing static electricity

Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged,

can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.

1.1. Grounding to prevent damage by static electricity

Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players.

Be careful to use proper grounding in the area where repairs are being performed.

1.1.1. Ground the workbench

1. Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over

it before placing the traverse unit (optical pickup) on it.

1.1.2. Ground yourself

1. Use an anti-static wrist strap to release any static electricity built up in your body.

1.1.3. Handling the optical pickup

1. In order to maintain quality during transport and before installation, both sides of the laser diode on the

replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition.

(Refer to the text.)

2. Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power

source can easily destroy the laser diode.

1.2. Handling the traverse unit (optical pickup)

1. Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.

2. Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific

details, refer to the replacement procedure in the text. Remove the anti-static pin when replacing the traverse

unit. Be careful not to take too long a time when attaching it to the connector.

3. Handle the flexible cable carefully as it may break when subjected to strong force.

4. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it

Conductive material

(conductive sheet) or iron plate

(caption)

Anti-static wrist strap

Shorted part

1-3

KD-SX870

KD-SX770

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Location of main parts

Control unit

Main unit

CD mechanism

Main board 16 pin connector

Power IC

Main board assembly

Loading motor

Damper

Spindle motor

Feed motor

Optical

pick up unit

Mechanism relay board

RCA jack

Connector to front PCB

Antenna

jack

Changer control

connector

Front PCB

Display

Tuner

pack

1-4

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KD-SX770

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Disassembly method

Removing the front chassis (See Fig.1)

1. Remove two screws A and 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.2 )

1. Remove the three screws B attaching the heat sink on

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

Removing the bottom cover (See Fig.3 )

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.

Fig.1

Fig.2

Front chassis

Heat sink

Fig. 3

Regulator board

1-5

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KD-SX770

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Removing the main amplifier board assembly

(See Fig.4 and 5)

Remove the front chassis.

Remove the bottom cover.

Remove the two screws C attaching the main amplifier

board assembly on the bottom of the body.

Remove the three screws D attaching the main amplifier

board assembly on the back of the body.

Disconnect connector CN501 on the main amplifier board

assembly from the CD mechanism assembly.

Removing the CD mechanism assembly

(See Fig.6 )

Remove the front chassis.

Remove the bottom cover.

Remove the main amplifier board assembly.

Remove the three screws E attaching the CD mechanism

assembly from the top cover.

Removing the control switch board

(See Fig.7 and 8 )

Remove the front chassis.

Remove the four screws F attaching the rear cover on the

back of the front panel unit.

Remove the control switch board from the front panel

unit.

Fig.4

Fig. 5

CD mechanism assembly

Top cover

Fig. 6

CN501

Main amplifier board

Fig. 7

Fig. 8

Control switch board

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KD-SX770

1-6

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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

1-7

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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)

1-8

KD-SX870

KD-SX770

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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-SX870

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1-10

Adjustment method

Test instruments required 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

Standard measuring conditions

Power supply voltage DC14.4V(10.5

–

16V)

Load impedance 4 (4 to 8 allowance)

Line-out Level/Impedance

KD-SX870 : 4.0 V/20k load(full scale)

KD-SX770 : 2.0 V/20k load(full scale)

Output impedance : 1k

How to connect the extension cable for adjusting

Standard volume position

Balance and Bass & Treble volume : Indication "0"

Loudness : OFF

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

1 – 3 87.5MHz – 107.9MHz

530kHz – 1710kHz

Frequency Band

KD-SX870

KD-SX770

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