JVC KDS-9 Service manual

SERVICE MANUAL

CD RECEIVER

KD-S9R

Contents

45Wx4

DISP

RDS

PTY

789101112

SCM

RND

SSM

RPT

Area Suffix

E Continental Europe

Safety precaution Preventing static electricity Disassembly method Adjustment method Flow of functional operation unit TOC read Maintenance of laser pickup Description of major ICs

This service manual is printed on 100% recycled paper.

1-2 1-3 1-4 1-9 1-10 1-11 1-12

No.49579

Dec. 2000

KD-S9R

Safety precaution

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.

1-2

Preventing static electricity

1.Grounding to prevent damage by 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.

KD-S9R

2.About the earth processing for the destruction prevention by static electricity

Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players. Be careful to use proper grounding in the area where repairs are being performed.

2-1 Ground the workbench

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.

2-2 Ground yourself

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

(caption) Anti-static wrist strap

Conductive material (conductive sheet) or iron plate

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.

4.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

CD mechanism ass’y

Damper bracket

Attention when traverse unit is decomposed

*Please refer to "Disassembly method" in the text for pick-up and how to detach the substrate.

1.Solder is put up before the card wire is removed from connector on the CD substrate as shown in Figure. (When the wire is removed without putting up solder, the CD pick-up assembly might destroy.)

2.Please remove solder after connecting the card wire with when you install picking up in the substrate.

Front bracket

Feed motor ass’y

FD screw

CD mechanism control board

Soldering

FD gear

Pickup unit

1-3

KD-S9R

Disassembly method

Removing the front panel unit (See Fig. 1, 2)

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

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

3.Remove the front panel unit from the same side as the shaft was removed.

Removing the front chassis assembly (See Fig. 3, 4)

1.Remove the front panel unit.

2.Remove the two screws A attaching the front chassis assembly.

3.Remove the four ribs a attaching the front chassis assembly to the chassis.

Front panel unit

Eject button

Fig 1

Open/close shaft arm

Fig 3

Removing the bottom cover assembly (See Fig. 5)

Fig 4

Fig 2

Turn the unit upside down,then insert and turn to b the screwdriver to remove the bottom cover.

1-4

Fig 5

Removing the main board(wiht rear panel) (See Fig. 6, Fig. 7)

1.Remove three screws E retaining the rear panel to the chassis

2.Remove one screw C retaining the IC to the heat sink.

3.Remove two screws D retaining the main board.

4.Lift up the main board to remove it.

5.Remove two screws B to remove the heat sink.

KD-S9R

Fig 6

Removing the rear bracket (See Fig. 7)

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

2.Remove one screw F to remove the line-out jack.

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

Fig 7-2

Fig 7-1

CD mechanism assembly (See Fig. 8)

Remove three mechanism mounting screws J retaining the top cover.

Front panel unit (See Fig.9)

Remove five screws K retaining the rear cover.

Fig 9

Fig 8

1-5

KD-S9R

Removing the CD mechanism control board (See Fig.1 and 2)

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.

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.2).

CD mechanism ass’y

Front bracket

Damper bracket

Fig.1

Pickup unit

Flexible wire

CD mechanism control board

Shift the lock

Loading motor

Pull outward

FD gear

Fig.2

CD mechanism control board

Front bracket

Fig.3

Front bracket

Pull outward

1-6

Flame

Fig.4

KD-S9R

Removing the loading motor

(See Fig.3 to 5)

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 CD mechanism ass’y

(See Fig.1, 6 to 9)

CD mechanism ass’y

Flame

Loading motor

Fig.5

Fig.6

Belt

Damper bracket

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.

ATTENTION:

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

Fix plate (L)

Fix arm (R)

Fig.7

Rear damper bracket

Fig.8

Rear damper bracket

Fix plate(R)

Fix arm (L)

Damper

Fig.9

1-7

KD-S9R

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) and the CD mechanism ass’y.

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

Removing the pickup unit

(See Fig.10 and 11)

*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.

Feed motor ass’y

FD gear

Nut push spring plate

FD screw

Pickup unit

Part n

Part O

Pickup unit

Fig.10

Pickup mount nut

Pickup unit

ATTENTION:

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

Removing the spindle motor

(See Fig.12 and 13)

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.

FD screw

Spindle motor

Fig.11

Fig.12

1-8

Fig.13

Adjustment method

KD-S9R

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 x 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:Indication"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.

1-9

KD-S9R

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

Focus Servo Loop ON

Disc inserted

Pickup feed to the inner area

Laser emitted

Focus search

Disc rotates

RF signal eye-pattern remains closed

Tracking 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

1-10

Jump to the first track

Play

Tracking Servo Loop ON

• RF signal

Rough Servo Mode

CLV Servo Mode (Program Area)

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.

KD-S9R

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.

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.

1-11

+ 25 hidden pages