JVC FSSD-550, FSSD-770, FSSD-990 Service manual

FS-SD990 / FS-SD770

SERVICE MANUAL

COMPACT COMPONENT SYSTEM

FS-SD990 / FS-SD770

FS-SD550

REMOTE CONTROL

POWER

DIMMER SLEEP

AUTO

DISPLAY FM MODE

PRESET

PROGRAM

REPEATRANDOM

DOOR

AHB PRO

SLIDE

BASS TREBLE CANCEL

SET

DOWN

FADE MUTING

MD/AUX FM / AM

VOLUME

REMOTE CONTROL

POWER

DIMMER SLEEP

AUTO

DISPLAY FM MODE

PRESET

PROGRAM

REPEATRANDOM

DOOR

AHB PRO

SLIDE

BASS TREBLE CANCEL

SET

DOWN

FADE MUTING

MD/AUX FM / AM

VOLUME

The difference between FS-SD550 and FS-SD770

The difference between FS-SD770 and FS-SD990 is cabinets of the speaker.

Contents

These models not have adjustment.

Safety Precautions Important for laser products Preventing static electricity Dismantling and assembling the traverse unit Disassembly method Maintenance of laser pickup Replacement of laser pickup

FS-SD770, FS-SD990

FS-SD550

FS-SD990 is only the speaker systems.

1-2 1-3 1-4

Flow of functional operation unit TOC read Method of connecting treatment device wire

1-5

Description of major ICs 1-6 1-15 1-15

Area Suffix

J C

U.S.A Canada

1-16

1-17 1-18

No.20947

Apr. 2001

FS-SD990 / FS-SD770 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 circuitr y 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. Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to eachexposed metal part, particularly any exposed metal part having a return path to the chassis, and meausre the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. voltage measured Any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.).

0.15 F AC TYPE

1500 10W

Good earth ground

AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity)

Place this probe on each exposed metal part.

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 m ust 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 v oltage.

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 pr inted 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

Important for laser products

FS-SD990 / FS-SD770

FS-SD550

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.

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.

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.

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

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-SD770 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-SD770

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.

FS-SD550

Shorting

KSM-900AAH

Sub board (Reverse side)

Flexible cable

1-5

FS-SD990 / FS-SD770 FS-SD550

Disassembly method

Removing the CD door (See Fig.1)

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

Removing the rear cover (See Fig.2)

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

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

CD door

Rear cover

Fig.1

Removing the right and left covers

(See Fig.3)

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

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

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

Left cover

Bottom

Fig.2

Fig.3

Right cover

1-6

FS-SD990 / FS-SD770

FS-SD550

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.

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

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.

(Left side)

Front panel assembly

Bottom

Front panel assembly

Fig.4

Front panel assembly

(Right side)

Joints a

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.

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.

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.

Joints b

CD mechanism base assembly

Fig.6Fig.5

Fig.7

CD mechanism base assembly

CN104

Fig.8

CN105

Main bard

1-7

FS-SD990 / FS-SD770 FS-SD550

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.

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

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.

Pull out the CD mechanism base assembly toward the front.

CD mechanism base assembly

Main board

CN101

CN705

CN708

Fig.9

CD mechanism base assembly

Door arm

CD mechanism base assembly

Gear a

Fig.12

Power amplifier board

Door arm

CN804

CD mechanism base assembly

Power amplifier board

Fig.10

CN301

Fig.11

1-8

Door arm board (L)

CN804

Fig.14

Gear a

Fig.13

FS-SD990 / FS-SD770

FS-SD550

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.

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:

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

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

When the door arms incline, the door arm assembly and the door arm board (R) and (L) may not be removed.

Door arm

Door arm board (L)

Fan motor

Door arms (Attached to the CD door)

Door arm board (R)

Fig.15

Door arm assembly

Fig.17

Door arm assembly

Fig.16

Door arm assembly

Fig.18

Door arm board (R)

Door arm board (L)

Fig.19

Fig.20

1-9

FS-SD990 / FS-SD770 FS-SD550

Removing the power amplifier board

(See Fig.21 and 22)

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

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

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.

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

Remove the four screws M attaching the transformer assembly.

Door arm assembly

CN191

Cord stopper

Transformer assembly

Heat sink

Power amplifier board

CN193

CN192

CN106

CN102

Cord stopper

Fig.21

Power amplifier board

Fig.22

CN181

Cord stopper

Main board

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.

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

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

Remove the belt from the gear motor assembly.

Remove the two screws O from the gear motor assembly.

Gear motor stopper

Motor

Gear motor assembly

Cord stopper

CN106

Fig.23

1-10

Belt

Fig.24

Removing the fan motor assembly

(See Fig.25 and 26)

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

Disconnect the wires from connector CN181 on the main board.

Remove the two screws P on the left side of the body. Move the fan motor assembly upward to remove it from the base chassis.

Remove the two screws Q and the fan motor from the fan bracket.

Removing the main board (See Fig.27)

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

Fan bracket

Fan motor

FS-SD990 / FS-SD770

FS-SD550

Main bard

CN181

Fig.25

To facilitate operation process, remove the gear motor assembly before performing the following procedure.

Disconnect the wires from connector CN102, CN106, CN191, CN192, CN193 and CN181 on the main board.

Remove the five screws R attaching the main board with the cord stopper.

Removing the front panel board

(See Fig.28)

Prior to performing the following procedure, remove the front panel assembly.

Remove the seven screws S attaching the front panel board inside the front panel assembly.

CN191

Fan motor

CN193

Front panel board

Fig.26

CN106

CN192

Fig.27

Gear motor assembly

Main board

CN102

CN181

Fig.28

1-11

FS-SD990 / FS-SD770 FS-SD550

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

Refer to "Dismantling and assembling the CD mechanism assembly" on page 1-5 for the treatment of optical pickup.

Removing the speaker terminal board

(See Fig.29)

Remove the screw T attaching the speaker terminal board on the underside of the CD mechanism base assembly.

Removing the CD mechanism board / CD mechanism assembly (See Fig.29 to 34)

Turn over the CD mechanism base assembly and disconnect the wires from connector CN703 and CN706 on the CD mechanism board.

Remove the seven screws U attaching the CD mechanism cover and the CD mechanism board.

CD mechanism board

CD mechanism cover

CN703

CD mechanism assembly

CN706

Fig.29

Joint c

Fig.30

Speaker terminal board

T U

Tab

CD mechanism cover

Turn back the CD mechanism assembly and detach the CD mechanism cover while pulling the CD mechanism assembly outward to release the two joint tabs marked c.

CD mechanism cover

Tab

CD mechanism assembly

Joint c

Fig.31

1-12

Solder the short circuit land on the sub board.

Disconnect the wire from connector CN605 on the main board. Disconnect the sub board from connector CN603 on the main board while peeling off the adhesive tape on the underside of the sub board.

Remove the CD mechanism assembly from the three shafts of the CD mechanism cover.

Cushion

CD mechanism board

Sub board

FS-SD990 / FS-SD770

FS-SD550

CD mechanism assembly

Cushion

CD mechanism cover

CN605

Short circuit land

ATTENTION:

When reassembling, confirm that the cushion of the CD mechanism assembly is reattached to the three shafts.

Remove the CD mechanism board from the CD mechanism cover.

CN606

Sub board

Fig.32

CD mechanism assembly

Main board

CN603

Short circuit land

Fig.33

Shafts

CD mechanism cover

CD mechanism board

CN603

CN605

Fig.34

1-13

FS-SD990 / FS-SD770 FS-SD550

Removing the jack board (See Fig.35)

Prior to performing following procedure, remove the CD mechanism board.

Disconnect the wire from connector CN502 on the jack board.

Remove the two screws V attaching the jack board.

Removing the switch board (See Fig.35)

Prior to performing following procedure, remove the CD mechanism board.

Disconnect the wire from connector CN502 on the jack board.

Jack board

CD mechanism board

CN502

Fig.35

CN706

Switch board

Tabs d

Remove the six screws W attaching the switch board.

Removing the LED board

(See Fig.36 and 37)

Disconnect the harness from connector CN706 on the CD mechanism board on the underside of the CD mechanism base assembly.

Push inward the two tabs d attaching the LED board case and release them.

Pull out the LED board from the LED board case.

Fig.36

LED board

LED board case

Fig.37

1-14

FS-SD990 / FS-SD770

FS-SD550

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:amplitude of eye pattern) will below.

Is the level of

RFOUT under

1.25V 0.22Vp-p?

YES

O.K

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.

(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.

1-15

FS-SD990 / FS-SD770 FS-SD550

Flow of functional operation until TOC read

Power ON

Play Key

Slider turns REST SW ON.

Automatic tuning of TE offset

Check Point

Confirm that the voltage at the pin4 of CN605 is "H"/"L"/"H".

Tracking error waveform at TOC reading

Approx.3sec

Tracking servo off states

Automatic measurement of TE amplitude and automatic tuning of TE balance

VREF

pin 25 of IC601(TE)

Approx

1.8V

Disc states to rotate

Tracking servo on states

Disc to be braked to stop

TOC reading finishes

500mv/div 2ms/div

Fig.1

Laser ON

Detection of disc

Automatic tuning of Focus offset

Automatic measurement of Focus S-curve amplitude

Disc is rotated

Focus servo ON (Tracking servo ON)

Automatic measurement of Tracking error amplitude

Automatic tuning of Tracking error balance

Check that the voltage at the pin40 of IC603 is + 5V?

Confirm that the Focus error S-cuve signal at the pin28 of IC603 is approx.2Vp-p

Confirm that the signal from pin24 IC603 is 0V as a accelerated pulse during approx.400ms.

Confirm the waveform of the Tracking error signal. at the pin 26 of IC601 (R6005) (See fig-1)

1-16

Automatic tuning of Focus error balance

Automatic tuning of Focus error gain

Automatic tuning of Tracking error gain

TOC reading

Play a disc

Confirm the eys-pattern at the lead of TP602

+ 37 hidden pages

JVC FSSD-550, FSSD-770, FSSD-990 Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual