Jvc FS-M3 Service Manual

SERVICE MANUAL

COMPACT COMPONENT SYSTEM

FS-M3

Area suffix

FS-M3

STANDBY/ON

TUNER /BAND

CD/RANDOM TAPE

REC

PROGRAM

SLEEP PRE UP

REMAIN

TIMER

DISPLAY

MODE

PRE EQ/HBS

BEAT CUT

MUTING

RM-SFSM3J REMOTE CONTROL

Contents

J ----------------------------- U.S.A. C -------------------------- Canada

COMPACT COMPONENT SYSTEM FS-M3

STANDBY

/ON

DISPLAY

MODE

TIMER

ON/OFF

SET

RANDOM

BAND

TUNER TAPE

PROGRAM

REPEAT

/PRE DOWNINTRO

VOLUME

–

PHONES

REPEAT

REC

PRESET

STOP/CLEAR PLAY/PAUSE

FULL LOGIC DECK

CD SYNCHRO RECORDING

SEARCH/TUNING

OPEN /CLOSE

REMAIN

INTRO

VOLUME

PRE EQ

/HBS

EJECT

Safety precautions Preventing static electricity Important for laser products Importance administering point on the safety Disassembly method Adjustment method

1-2 1-3 1-4

1-5 1-6 1-15

Flow of functional operation until TOC read Maintenance of laser pickup Replacement of laser pickup Trouble shooting Description of major ICs Wiring connections

1-18 1-19 1-19 1-20 1-21 1-29

No.21067

Feb. 2002

FS-M3

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. Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to each exposed 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 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. (This regulation does not correspond to J and C version.)

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.

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

FS-M3

Conductive material (conductive sheet) or iron plate

3. Handling the optical pickup

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

1. replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.)

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

2. source can easily destroy the laser diode.

4. Handling the traverse unit (optical pickup)

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

Remove solder of the short land on the card wire 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.

Handle the card wire carefully as it may break when subjected to strong force.

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

5. Attention when traverse unit is decomposed

Connector

*Please refer to "Disassembly method" in the text for the CD pickup unit.

Short land

Apply solder to the short land before the card wire is disconnected from the connector on the CD pickup unit. (If the card wire is disconnected without applying solder, the CD pickup may be destroyed by static electricity.) In the assembly, be sure to remove solder from the short land after connecting the card wire.

CD pickup unit

1-3

FS-M3

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 laserradiation and is equipped with safety switches whichprevent emission of radiation when the drawer is open and the safety interlocks have failed or are de feated. 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

CLASS 1

LASER PRODUCT

CAUTION:

INVISIBLE LASER RADIATION WHEN OPEN AND

INTERLOCK DEFEATED. AVOID EXPOSURE TO BEAM.

ADVARSEL:

USYNLIG LASERSTRÅLING VED ÅBNING NÅR SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION. UNDG UDSAETTELSE FOR STRÅLING.

VARO:

AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALTTIINA NÄKYMÄTTOMÄLLE LASERSÄTEILYLLE ÄLÄ KATSO SÄTEESEEN.

VARNING:

OSYNLIG LASERSTRALNING NAR DENNA DEL AR OPPNAD OCH SPARREN AR URKOPPLAD. BETRAKTA EJ STRALEN.

1-4

Importance administering point on the safety

FS-M3

F903

F902

F901

Caution: For continued protection against risk of fire, replace only with same type 1.6A/250V for F901,3.15A/250V for F902,1.6A/250V for F903. This symbolspecifies type of fast operating fuse.

Precaution: Pour eviter risques de feux, remplacez le fusible de surete de F901 comme le meme type que 1.6A/250V,F902 comme le meme type que

3.15A/250,et 1.6A/250V pour F903. Ce sont des fusibles suretes qui functionnes rapide.

1-5

FS-M3

Disassembly method

Replacement of the fuses and power amplifier IC

Replacing the fuses (See Fig. 1.)

Remove the left side panel according to its disassembly method (see Figs. 5 and 6).

Fuses are located inside the left side panel.

[Caution] Be sure to replace the required fuses with designated ones.

Fuse(F903)

1.6A 250V

Fuse(F902)

3.15A 250V Power board

Fuse(F901)

1.6A 250V

Replacing the power amplifier IC on

the main board (See Fig. 2.)

Remove the main board according to its disassembly method (see Figs. 17 and 18).

Remove the two screws A that attach the power amplifier IC onto the heat sink.

In order to replace the power amplifier IC, remove the solder from soldered part a on the back side of the main board.

Soldered part a

Fig.1

Main board

Power amplifier IC

(IC401)

Heat sink

Fig.2

1-6

Removing the right side panel

(See Figs. 3 and 4.)

1.2.From the right side of the main body, remove the three screws B and three screws C retaining the right side panel.

Slide the right side panel toward the rear (in the direction of arrow 1) until the claw b at the back of the panel is hooked by the chassis and then lift the panel upward (in the direction of arrow 2) to remove it.

Removing the left side panel

(See Figs. 5 and 6.)

FS-M3

Right side panel

Fig.3

1.2.From the left side of the main body, remove the three screws B and three screws C retaining the left side panel.

Slide the left side panel toward the rear (in the direction of arrow 3) until the claw c at the back of the panel is hooked by the chassis, and then lift the panel upward (in the direction of arrow 4) to remove it.

Left side panel

Right side panel

Claw b

Fig.4

Fig.5

Claw c

Fig.6

1-7

FS-M3

Removing the top cover

(See Figs. 7 and 8.)

Remove the left and right side panels.

1.2.From the back side of the main body, loosen the two screws D retaining the top cover.

Lift the rear part of the top cover to remove it.

Removing the front panel assembly

(See Figs. 9 to 11.)

Remove the left and right side panels. Remove the top cover.

Remove the tie band bundling the wires.

Disconnect the wire from the connector CN902 on the power board.

Disconnect the wire from the connector on the cassette switch board.

Remove the screw E retaining the bracket on the H.P. jack board.

Disconnect the wires from the two connectors CN201 and CN402 on the main board.

Disconnect the wires from the two connectors CN607 and CN608 on the CD & MCU board.

Remove the four screws F and the two screws G retaining the bracket of the CD mechanism assembly from the left and right.

Remove the screw H retaining the front panel assembly from the bottom side of the main body.

While opening the hooks d to the left and right of the lower part of the front panel assembly (in the direction of arrows 1), slide the front panel assembly toward the front (in the direction of arrow

2).

Lift the rear part to remove.

CD mechanism assembly

CN402

Fig.7

Fig.8

(To be loosened)

Rear panel

CN201

CN608

Top cover

G E

H.P. jack board

Tie band

[Note] After assembly, apply a locking agent to the screws F and G.

CD mechanism assembly

CN607

1-8

Connector on the cassette switch board

Chassis

Power board

Fig.9

Hook d

Fig.11Fig.10

Ferrite core

CN902

Front panel assembly

Tie band

Removing the CD mechanism assembly (See Figs. 12 to 14.)

Remove the left and right side panels. Remove the top cover. Remove the front panel assembly.

Disconnect the wires from the four connectors CN601, CN602, CN603 and CN701 on the CD & MCU board.

From the left side of the main body, remove the tie band bundling the wires.

Loosen the screw J retaining the main board.

From the left and right sides of the main body, remove the four screws K retaining the bracket.

Slide the CD mechanism assembly toward the front and remove it from the studs of the main board.

[Note] After assembly, apply a adhesive agent to the stud.

CD & MCU board

CN701

CN603

CD mechanism assembly

CD & MCU board

CN601

CN602

Fig.12

FS-M3

Tie band

CD mechanism assembly

Stud

Fig.13

CD & MCU board

Main board

Fig.14

1-9

FS-M3

Removing the power board

(See Figs. 15 and 16.)

Remove the left and right side panels.

Disconnect the wire from the connector CN901 on the power board.

Remove the two screws L retaining the chassis .

Remove the power board by pinching the two studs retaining the board using radio pliers, etc.

[Note] After assembly, apply a locking agent to the screw L. After assembly, apply a adhesive agent to the studs.

Power transformer

Chassis

Power board

Stud

CN901

Fig.15

Stud

Main board

Power board

Radio pliers, etc.

Stud

Removing the main board

(See Figs. 17 and 18.)

Remove the left and right side panels. Remove the top cover. Remove the front panel assembly. Remove the CD mechanism assembly.

Remove the two screws M retaining the speaker terminal of the main board.

From the top side of the main body, remove the screw N retaining the heat sink of the main board.

Remove the solder from the soldered part e that attaches the FM antenna wire to the main board.

Slide the main board toward the front to remove it from the chassis.

[Note] After assembly, apply a locking agent to the screw N.

Soldered part e

FM antenna wire

Chassis

Fig.16

Fig.17

Heat sink

Chassis

Rear panel

Speaker terminal

Main board

1-10

Power transformer

Fig.18

FS-M3

Remove the left and right side panels. Remove the top cover. Remove the front panel assembly.

Removing the key switch board

(See Fig. 19.)

Remove the ten screws P retaining the key switch board.

Removing the cassette mechanism

assembly (See Fig. 19.)

Remove the two screws Q and the two screws R

1. retaining the cassette mechanism assembly.

Remove the tie band bundling the REC/PB head

2. wire.

[Note] After assembly, apply a locking agent to the screws Q and R.

Removing the cassette door damper

and cassette door stopper(See Fig. 19.)

Remove the screw S retaining the damper bracket

1. and take out the cassette door damper.

Remove the two screws T retaining the cassette

2. door stopper and remove the cassette door stopper.

[Note] After assembly, apply a locking agent to the screws S and T.

Removing the cassette door cover

(See Fig. 20.)

[Note] Use the following procedure to remove only the cassette door cover. This procedure does not require the removal of exterior parts such as the side panels.

1.2.Open the cassette door.

Slide the cassette door cover in the direction of the arrow and disengage the two claws f and the two claws g on the left and right of the cassette door cover from the cassette door.

Removing the cassette door

(See Figs. 21 and 22.)

Remove the cassette mechanism assembly. Remove the cassette door cover.

Open the cassette door, disengage the spring hooked across the front of the front panel assembly and the cassette door in the outward direction, and remove it from the claw h.

Front panel assembly

Cassette door

sttoper

Damper bracker

Cassette door damper

Cassette door

Claw f

Claw g

Cassette door cover

Fig.19

Fig.20

Key switch board

Cassette mechanism assembly

Tie band

REC/PB head wire

Front panel assembly

Spring

Claw h

From the back side of the front panel assembly, remove the two screws U retaining the bracket.

While pushing the arm section i of the cassette door in the direction of the arrow, remove the shaft section j of the cassette door from the front panel assembly.

While pushing the cassette door arm section k in the direction of the arrow, remove the shaft section m of the cassette door from the front panel assembly.

Take out the cassette door from the back side of the front panel assembly.

[Caution] In the assembly, be sure to put the spring around the shaft j before attaching the cassette door.

[Note] After assembly, apply a locking agent to the screw U.

Arm section i

Shaft section j

Spring

Disengage the spring so that it comes to the front of the claw h.

Fig.21

Front panel assembly

Arm section k

Shaft section m

Bracket

Fig.22

1-11

FS-M3

Remove the left and right side panels. Remove the top cover. Remove the front panel assembly. Remove the CD mechanism assembly.

Removing the CD & MCU board

(See Figs. 23 and 24.)

From the back side of the CD mechanism assembly, remove the four screws V retaining the CD & MCU board.

Disengage the two studs retaining the CD & MCU board.

Disconnect the wires from the two connectors CN702 and CN703 on the CD & MCU board.

Lift the CD & MCU board and attach solder to the short land part n on the CD pickup assembly.

Stud

CD & MCU board

Fig.23

CN704

CN702

CD pickup unit

Disconnect the card wire from the connector CN704 on the CD & MCU board, and take out the CD & MCU board.

[Caution] Be sure to solder the short land part n on the CD pickup unit before disconnecting the card wire from the CD pickup assembly (see Fig. 24). If the card wire is disconnected without attaching solder, the CD pickup may be destroyed by static electricity. In the assembly, be sure to remove solder from the short land part n after connecting the card wire.

[Note] After assembly, apply a locking agent to the screw V. After assembly, apply a adhesive agent to the studs.

Removing the CD pickup assembly

(See Fig. 25.)

Remove the CD & MCU board.

From the back side of the CD mechanism assembly, remove the four screws W retaining the CD pickup assembly.

CN703

CD pickup assembly

CD mechanism assembly

Fig.24

CD pickup assembly

Damper(Gray)

Short land part n

Damper(Blue)

Take out the CD pickup assembly.

[Note] When removing or replacing the dampers, note their colors and be sure to attach them in their correct positions.

1-12

Damper(Blue)Damper(Gray)

Fig.25

FS-M3

Removing the tray motor

(See Figs. 26 to 29.)

Remove the CD & MCU board.

On the top of the CD mechanism assembly, open up the claws p and q at the left and right of the clamper assembly and lift the assembly to remove it.

On the top of the CD mechanism assembly, push the section r of the elevator in the direction of the arrow and lower the CD pickup assembly.

Pull out the tray.

While opening up the claws s at the left and right of the tray in the directions of the arrows, remove the tray.

While pushing the claw t on the CD mechanism assembly downwards, slide the elevator fully in the direction of the arrow.

Remove the transparent cover.

CD mechanism assembly

Claw p

Claw q

Fig.26

Clamper assembly

Claw q

Tray

Remove the belt from the tray motor pulley.

Remove the two screws X retaining the tray motor and remove it.

[Note] Take care not to attach grease on the belt. After attaching the tray motor in the assembly, apply a locking agent to the screws X.

Fig.27

r section

TrayClaw s

Claw s

Fig.28

CD mechanism assembly

Claw t

Tray motor pulley

Fig.29

Transparent

Belt

cover

1-13

FS-M3

Replacing the CD pickup unit

(See Figs. 30 to 33.)

[Note] Use the following procedure to replace only the CD pickup unit.

Remove the left and right side panels (see Figs. 3 to 6).

Remove the top cover (see Figs. 7 and 8).

On the top of the main body, open up the claws p and q on the left and right of the clamper assembly in the direction of the arrows and lift the assembly to remove it.

On the top of the main body, push section r on the elevator of the CD mechanism assembly and lower the CD pickup assembly.

Pull out the tray.

Remove the slit washer retaining the feed middle gear, and take out the feed middle gear.

Clamper assembly

Claw g

Claw p

Front panel assembly

Claw g

Fig.30

Front panel assembly

Remove the two screws Y retaining the shaft.

Turn the CD pickup unit upside down and apply solder to the short land part n.

Disconnect the card wire from the CD pickup unit and replace the unit.

[Caution] Be sure to solder the short land part n on the CD pickup unit before disconnecting the card wire from the CD pickup unit (see Fig. 33). If the card wire is disconnected without attaching solder, the CD pickup may be destroyed by static electricity. In the assembly, be sure to remove solder from the short land part n after connecting the card wire. [Note] Removing the CD pickup unit involves the removal of the sliding spring. In the assembly, be sure to attach the spring in the correct orientation before attaching the CD pickup unit (see Fig. 33).

Feed middle gear

Fig.31

CD pickup assembly

Fig.32

Card wire

r section

TraySlit washer

1-14

Sliding spring

Short land part n

Fig.33

Adjustment method

FS-M3

Measuring instructions required for adjustment

1. AM signal generator

2. FM signal generator

3. Inter mediate frequency sweep generator

4. FM stereo signal generator

5. Low-frequency oscillator (oscillation frequency 50Hz-20kHz, 0dB output with 600 ohm impedance)

6. Attenuator (600 ohm impedance)

7. Electronic voltmeter

8. Distortion meter

9. Torque gauge (cassette for CTG-N)

10. Wow & flutter meter

11. Frequency counter meter

12. Test tape VT712 : For tape speed and wow flutter VT724 : For reference level VT703 : For playback frequency VT703 : For head azimuth adjustment

13. Blank tape TAPE : AC-225

Measuring instruments

Radio section FM 1kHz, 22.5kHz deviation FM STEREO : 1kHz, 67.5kHz deviation pilot signal 7.5kHz AM : 1kHz, 30% modulation Reference output : H.phone output -10dBs(0.245V) 32 ohm Speaker output 0dBs(2.8V) 8 ohm

Cassette amplifier section Reference output : H.phone output -10dBs(0.245V) 32 ohm Speaker output 0dBs(2.8V) 8 ohm Standard mode of function knob : Press TAPE knob of select TAPE mode

CD section CD test disc : CTS-1000

Measurement conditions

Power supply voltage AC120V/60Hz

1-15

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