JVC FS-SD550 Service Manual

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FS-SD990/FS-SD550

SERVICE MANUAL

COMPACT COMPONENT SYSTEM

FS-SD990 / FS-SD550

Area Suffix

			A	Australia
			A	Australia

FS-SD990

FS-SD550

The difference between FS-SD550 and FS-SD990 is only the speaker systems.

Contents These models not have adjustment.

Safety Precautions	1-2	Flow of functional operation
Important for laser products	1-3	unit TOC read	1-16
Preventing static electricity	1-4	Method of connecting
Dismantling and assembling		treatment device wire	1-17
the traverse unit	1-5	Description of major ICs	1-18
Disassembly method	1-6
Maintenance of laser pickup	1-15
Replacement of laser pickup	1-15

No.20948

Apr. 2001

FS-SD990/FS-SD550

1.This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services should be performed by qualified personnel only.

2.Alterations of the design or circuitry of the product should not be made. Any design alterations of the product should not be made. Any design alterations or additions will void the manufacturer`s warranty and will further relieve the manufacture of responsibility for personal injury or property damage resulting therefrom.

3.Many electrical and mechanical parts in the products have special safety-related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which

have these special safety characteristics are identified in the Parts List of Service Manual. Electrical components having such features are identified by shading on the schematics and by () on the Parts List in the Service Manual. The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or other hazards.

4.The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of electric shock and fire hazard. When service is required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, after re-assembling.

5.Leakage currnet check (Electrical shock hazard testing)

After re-assembling the product, always perform an isolation check on the exposed metal parts of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock.

Do not use a line isolation transformer during this check.

Plug the AC line cord directly into the AC outlet. Using a "Leakage Current Tester", measure the leakage current from each exposed metal parts of the cabinet, particularly any exposed metal part having a return path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.).

Alternate check method

Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or more

sensitivity in the following manner. Connect a 1,500

10W resistor paralleled by a 0.15 F AC-type capacitor

between an exposed metal part and a known good earth ground.

AC VOLTMETER

Measure the AC voltage across the resistor with

the AC

(Having 1000

voltmeter.

ohms/volts,

Move the resistor connection to eachexposed metal part,

or more sensitivity)

particularly any exposed metal part having a return

path to

0.15 F AC TYPE

the chassis, and meausre the AC voltage across the resistor.

Now, reverse the plug in the AC outlet and repeat each

Place this

measurement. voltage measured Any must not exceed 0.75 V

probe on

each exposed

AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.).

1500

10W

metal part.

Good earth ground

1.This equipment has been designed and manufactured to meet international safety standards.

2.It is the legal responsibility of the repairer to ensure that these safety standards are maintained.

3.Repairs must be made in accordance with the relevant safety standards.

4.It is essential that safety critical components are replaced by approved parts.

5.If mains voltage selector is provided, check setting for local voltage.

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.

In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the parts that are printed over with black such as the resistor (), diode ( ) and ICP ( ) or identified by the " " mark nearby are critical for safety.

When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer. (Except the JC version)

1-2

FS-SD990/FS-SD550

Important for laser products

1.CLASS 1 LASER PRODUCT

2.DANGER : Invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure to beam.

3.CAUTION : There are no serviceable parts inside the Laser Unit. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions.

4.CAUTION : The compact disc player uses invisible laser radiation and is equipped with safety switches which prevent emission of radiation when the drawer is open and the safety interlocks have failed or are

defeated. It is dangerous to defeat the safety switches.

5.CAUTION : If safety switches malfunction, the laser is able

to function.

6.CAUTION : Use of controls, adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

! CAUTION Please use enough caution not to see the beam directly or touch it

in case of an adjustment or operation check.

VARNING : Osynlig laserstrålning är denna del är öppnad och spårren är urkopplad. Betrakta ej strålen.

VARO : Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle.Älä katso säteeseen.

ADVARSEL : Usynlig laserstråling ved åbning , når sikkerhedsafbrydere er ude af funktion. Undgå udsættelse for stråling.

ADVARSEL : Usynlig laserstråling ved åpning,når sikkerhetsbryteren er avslott. unngå utsettelse for stråling.

REPRODUCTION AND POSITION OF LABELS

WARNING LABEL

CLASS 1

LASER PRODUCT

DANGER : Invisible laser radiation when open and interlock or defeated.

AVOID DIRECT EXPOSURE TO

BEAM (e)

VARO : Avattaessa ja suojalukitus

ohitettaessa olet alttiina
näkymättömälle lasersäteilylle.Älä
katso säteeseen.	(d)

VARNING : Osynlig laserstrålning är denna del är öppnad och spårren är urkopplad. Betrakta ej strålen. (s)

ADVARSEL :Usynlig laserstråling ved åbning , når sikkerhedsafbrydere er ude af funktion. Undgå udsættelse for stråling. (f)

1-3

FS-SD990/FS-SD550

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.

(caption)

Anti-static wrist strap

Conductive material (conductive sheet) or iron plate

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

1-4

FS-SD990/FS-SD550

Dismantling and assembling the traverse unit

Notice regarding replacement of optical pickup

1.Do not touch the area around the laser diode and actuator.

2.Do not check the laser diode using a tester, as the diode may easily be destroyed.

3.It is recommended that you use a grounded soldering iron when shorting or removing the laser diode. Recommended soldering iron: HAKKO ESD-compatible product

4.Solder the land on the optical pickup's flexible cable.

Note : Short the land after shorting the terminal on the flexible cable using a clip, etc., when using an ungrounded soldering iron.

Note : After shorting the laser diode according to the procedure above, remove the solder according to the text explanation.

KSM-900AAH

Sub board (Reverse side)

Shorting

Flexible cable

1-5

FS-SD990/FS-SD550

Disassembly method

<Main body>	A	A
	A	A
Removing the CD door (See Fig.1)

1.Remove the four screws A attaching the CD door on the upper side of the body.

CD door

Fig.1

Removing the rear cover (See Fig.2)

Piror to performing the following procedure, remove the CD door.

	1. Remove the ten screws B and the five screws C	B
	attaching the rear cover on the back of the body.	B
	attaching the rear cover on the back of the body.

Rear cover

C B C B C

Removing the right and left covers

(See Fig.3)

Prior to performing the following procedure, remove the CD door, the rear cover.

1.Remove the four screws D attaching the side covers on the bottom of the body.

2.Move the left cover backward and remove outward. Also remove the right cover in the same way.

B B B

Fig.2

D Right cover

D Bottom

Left cover

Fig.3

1-6

Removing the front panel assembly

(See Fig.4 to 6)

Prior to performing the following procedure, remove the CD door, the rear cover and the side covers.

1.Remove the three screws E on the bottom of the body.

2.Release two joints a and two joints b on both sides of the body using a screwdriver and remove the front panel assembly toward the front.

Bottom

Front panel assembly

Fig.4

FS-SD990/FS-SD550

(Left side)	Front panel assembly	Front panel assembly
		(Right side)

	Joints a	Joints b
	Joints a
Fig.5		Fig.6

Removing the CD mechanism base assembly (See Fig.7 to 14)

Prior to performing the following procedure, remove the CD door, the rear cover, the side covers and the front panel assembly.

1.Disconnect the card wire from connector CN104 and CN105 of the main board in the front part of the body. Disconnect the card wire from CN101 of the main board on the right side, and the wire from CN705 and CN708 of the CD mechanism base assembly respectively.

2.Remove the four screws F attaching the CD mechanism base assembly on the upper side of the body. Remove the screw I attaching the earth terminal on the right side.

F F

CD mechanism base assembly

Fig.7

CD mechanism base assembly

CN104	CN105	Main bard
		Main bard

Fig.8

1-7

FS-SD990/FS-SD550

3.Remove the screw G attaching the power amplifier board on the back of the body. Disconnect the wire from connector CN301 and pull the power amplifier board fully outward.

4.Raise the right and left door arms by turning the gear a in the rear of the power amplifier board.

5.After the CD mechanism base assembly is detached from the door arms, pull the CD mechanism base assembly toward the front and disconnect the wire from connector CN804 on the left side of the door arm board.

6.Pull out the CD mechanism base assembly toward the front.

CD mechanism base assembly	F

CN705

CN708

Main board

CN101

Fig.9

CD mechanism base assembly

CN804

Fig.10

CD mechanism base assembly

Power amplifier board

CN301

Door arm

Power amplifier board

Gear a

	Door arm	G
	Fig.12	G
	Fig.12	Fig.11
	CD mechanism base assembly

Door arm board (L)

CN804

Gear a

Fig.14

Fig.13

1-8

Removing the door arm assembly / the door arm board (R) and (L)

(See Fig.15 to 20)

Prior to performing the following procedure, remove the rear cover, the side covers, the front panel assembly and the CD mechanism base assembly.

1.In case that the upper parts of the door arms attached to the CD door are not level, let down them to the level position by turning the gear a in the direction of the arrow.

ATTENTION: When the door arms incline, the door arm assembly and the door arm board

(R)and (L) may not be removed.

2.Remove the four screws H on the upper side and the one screw I on the left side of the body.

3.Remove the four screws J attaching the door arm board (L) and (R) on both sides of the door arm assembly.

FS-SD990/FS-SD550

Door arm Door arm board (R)

Door arm

Door arm board (L)

Fan motor

Fig.15

Door arms (Attached to the CD door)

Fig.16

Door arm assembly	Door arm assembly

Fig.17

Fig.18

Door arm assembly

J Door arm board (R)

Door arm board (L)

Fig.19

Fig.20

1-9

FS-SD990/FS-SD550

Removing the power amplifier board (See Fig.21 and 22)

Prior to performing the following procedure, remove the CD mechanism base assembly.

1.Disconnect the wires from connector CN102 and CN193 on the main board and release them from the cord stopper respectively.

2.Remove the two screws K and the two screws L attaching the heat sink and the power amplifier board.

Removing the transformer assembly (See Fig.21)

Prior to performing the following procedure, remove the CD mechanism base assembly.

1.Disconnect the wires from connector CN191 and CN192 on the main board and release them from the cord stopper respectively.

2.Remove the four screws M attaching the transformer assembly.


Door arm assembly	Power amplifier board
CN191 CN193		CN106

Cord stopper

M CN192		CN181
	CN102
Cord stopper		Main board

	Cord stopper
Transformer assembly

Fig.21

Power amplifier board

Heat sink

L K

Fig.22

Removing the gear motor assembly

(See Fig.23 and 24)

Prior to performing the following procedure, remove the CD mechanism base assembly and the door arm assembly.

1.Disconnect the wires from connector CN106 on the main board and release it from the cord stopper.

2.Remove the three screws N attaching the gear motor assembly. Remove the gear motor assembly with the gear motor stopper.

3.Remove the belt from the gear motor assembly.

4.Remove the two screws O from the gear motor assembly.

Gear motor stopper	N	Gear motor assembly
		Gear motor assembly

Cord stopper

N CN106

Fig.23

Motor

Belt

Fig.24

1-10

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