JVC UX M5 Service Manual

SERVICE MANUAL

MICRO COMPONENT SYSTEM

UX-M5

Area suffix

UP -------------------------- Korea

UX-M5

STANDBY/ON

TUNER

TAPE

/BAND

/REV.MODE

/RANDOM

PRE DOWN PRE UP

REC

REPEAT

SLEEP

REMAIN

ST/MONO

INTRO

TIMER PROGRAM

DISPLAY

PRE EQ

/HBS

MODE

VOLUME

MUTING BEAT CUT

RM-SUXM5U REMOTE CONTROL

Contents

Safety precautions Preventing static electricity Important for laser products Disassembly method Adjustment method Flow of functional operation until TOC read

MICRO COMPONENT SYSTEM UX-M5

STANDBY

/ON

DISPLAY

MODE

TIMER

ON/OFF

SET

RANDOM

PROGRAM

ST/MONO

STOP/CLEAR

REPEAT

PHONES

REC

DIRECTION PLAY/PAUSE

AUTO REVERSE

CA-UXM5 SP-UXM5SP-UXM5

1-2 1-3 1-4 1-5 1-14

1-17

CD-R/RW PLAYBACK

OPEN/ CLOSE

REMAIN

BAND REV. MODE

TUNER TAPE

PRESET

FULL LOGIC DECK

SEARCH/TUNING

PRE EQ

INTRO

VOLUME

/HBS

EJECT

Maintenance of laser pickup Replacement of laser pickup Trouble shooting Description of major ICs Wiring connection

1-18 1-18 1-19 1-20 1-34

No.21170

Jan. 2003

UX-M5

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

UX-M5

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

UX-M5

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

CLASS 1

LASER PRODUCT

WARNING LABEL

1-4

Disassembly method

UX-M5

Replacement of the fuses and power amplifier IC

Replacing the fuses (See Fig. 1.)

Remove the left side plate according to its disassembly method. (See Figs. 6 and 7.)

Fuses are located inside the left side plate.

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

Fuse(F903)

Fuse(F904)

1.6A 250V

2.5A 250V

Power board

Fuse(F901)

1.6A 250V

Fuse(F902)

2.5A 250V

Fig.1

Replacing the power amplifier IC on

the main board (See Figs. 2 and 3.)

Remove the main board according to its disassembly method. (See Figs. 18 and 19.)

From the reverse side of the main board, remove the two screws A retaining the bracket.

(See Fig. 2.)

From the forward side of the main board, remove the four screws B retaining the bracket.

(See Fig. 3.)

Remove the screw C attaching the power amplifier IC onto the heat sink. (See Fig. 3.)

In order to replace the power amplifier IC, remove the solder from the soldered part a on the reverse side of the main board. (See Fig. 3.)

Soldered part a

Heat sink

Main board (Reverse side)

Fig.2

Main board

Power amplifier IC

(IC402)

Bracket

Fig.3

1-5

UX-M5

Removing the right side plate

(See Figs. 4 and 5.)

1.2.From the right side of the main body, remove the three screws D and three screws E retaining the right side plate. (See Fig.4.)

Slide the right side plate toward the rear (in the direction of the arrow 1) until the claw b at the back of the right side plate is hooked by the bottom case and then lift the right side plate upward (in the direction of the arrow 2) to remove it. (See Fig.5.)

Removing the left side plate

(See Figs. 6 and 7.)

1.2.From the left side of the main body, remove the

three screws D and three screws E retaining the left side plate. (See Fig.6.)

Right side plate

Fig.4

Right side plate

Slide the left side plate toward the rear (in the direction of the arrow 3) until the claw c at the back of the left side plate is hooked by the bottom case, and then lift the left side plate upward (in the direction of the arrow 4) to remove it. (See Fig.7.)

Left side plate

Bottom case

Left side plate

Claw b

Fig.5

1-6

Fig.6

Claw c

Fig.7

Bottom case

UX-M5

Removing the top cabinet

(See Figs. 8 and 9.)

Remove the left and right side plates.

1.2.From the back side of the main body, loosen the two screws F retaining the top cabinet.

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

(See Fig.8.)

(See Fig.9.)

Removing the front cabinet assembly

(See Figs. 10 to 12.)

Remove the left and right side plates. Remove the top cabinet.

From the left side of the main body, remove the tie band bundling the wires. (See Fig.10.)

Disconnect the wire from the connector on the cassette switch board. (See Fig.10.)

Remove the screw G retaining the holder on the H.phone j. board. (See Fig.10.)

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

(See Figs.10 and 11.)

Lift the rear part to remove.

Fig.8

(To be loosened)

Top cabinet

Rear cabinet

Remove the four screws H and the two screws J retaining the CD mechanism assembly from the left and right. (See Figs.10 and 11.)

Remove the screw K retaining the front cabinet 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 cabinet assembly (in the direction of the arrows 1), slide the front cabinet assembly toward the front (in the direction of the arrow 2). (See Fig.12.)

Disconnect the wire from the connector on the PB/REC head board, and then remove the front cabinet assembly. (See Fig.12.)

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

(See Fig.12.)

CD mechanism assembly

CD & MCU board

Connector on the cassette switch board

Bottom case

Fig.9

Power board

Fig.10

Hook d

Holder

Tie band

Connector on the PB/REC head board

Front cabinet assembly

CN608

J G

H.phone j. board

CN607

Hook d

.11

Fig.12

1-7

UX-M5

Removing the CD mechanism

assembly (See Figs. 13 to 15.)

Remove the left and right side plates. Remove the top cabinet. Remove the front cabinet assembly.

From the top side of the main body, disconnect the wires from the four connectors CN601, CN602, CN603 and CN701 on the CD & MCU board.

(See Fig.13.)

CN701

CN603

CN601

CN602

From the left side of the main body, remove the tie band bundling the wires. (See Fig.14.)

Disconnect the wire from the connector CN902 on the power board. (See Fig.14.)

From the left and right sides of the main body, remove the four screws L retaining the CD rear mount bracket. (See Figs.14 and 15.)

Slide the CD mechanism assembly toward the front (in the direction of the arrow) and remove it from the board lock support of the main board.

(See Fig.15.)

CD & MCU board CD mechanism assembly

Fig.13

CD & MCU board

Fig.14

CD & MCU board

Tie band

CN902

1-8

Board lock support

Main board

Fig.15

UX-M5

Removing the power board

(See Figs. 16 and 17.)

Remove the left and right side plates.

Disconnect the wires from the connector CN901 on the power board. (See Fig.16.)

Remove the tie band bundling the wires.

(See Fig.16.)

Remove the screw M retaining the lug wire.

(See Fig.16.)

Remove the two screws N retaining the bottom case. (See Fig.16.)

Remove the power board by pinching the two board lock supports retaining the power board using radio pliers, etc. (See Fig.17.)

Removing the main board

(See Figs. 18 and 19.)

Remove the left and right side plates. Remove the top cabinet. Remove the front cabinet assembly. Remove the CD mechanism assembly.

Power transformer

Bottom case

Power board

Main board

Board lock support

Fig.16

Radio pliers, etc.

Board lock support

Bottom case

Fig.17

CN901

Tie bands

Lug wire

Power board

From the inside of the rear cabinet, remove the five screws P retaining the bracket. (See Fig.18.)

From the rear side of the main body, remove the two screws Q retaining the speaker terminal of the main board. (See Fig.18.)

Remove the three screws R retaining the rear cabinet, then remove the rear cabinet. (See Fig.18.)

From the top side of the main body, remove the screw S retaining the bracket of the main board.

(See Fig.19.)

Remove the screw T retaining the regulator IC(IC302). (See Fig.19.)

Remove the tie band bundling the wires.

(See Fig.19.)

Disconnect the wire from the connector CN901 on the power board. (See Fig.19.)

Remove the solder from the soldered part e that attaches the FM antenna wire to the main board. (See Fig.19.)

Soldered part e

FM antenna wire

Rear cabinet

Fig.18

Regulator IC

(IC302)

Main board

CN901

Remove the stud on the main board, and then take out the main board from the bottom case.

Heat sink

Bracket

Power transformer

Power board

Fig.19

Tie bands

Bottom case

1-9

UX-M5

Remove the left and right side plates. Remove the top cabinet. Remove the front cabinet assembly.

Removing the key switch board

(See Fig. 20.)

Remove the ten screws U retaining the key switch board.

Removing the cassette mechanism

assembly (See Fig. 20.)

Remove the two screws V and the two screws W retaining the cassette mechanism assembly.

[Note] After assembly, apply a locking agent to the screws V and W.

Removing the damper gear

(See Fig. 20.)

Remove the screw X retaining the D.gear bracket and take out the damper gaer.

Removing the latch cam holder

(See Fig. 20.)

Remove the two screws Y retaining the latch cam holder and remove the latch cam holder.

Removing the cassette door cover

(See Fig. 21.)

[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 plates.

1.2.Open the cassette door.

Front cabinet assembly

Latch cam holder

D.gear holder

Damper gear

Technical door

Claw f

Claw g

Key switch board

Cassette mechanism assembly

Fig.20

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 technical door.

Removing the technical door

(See Figs. 22 and 23.)

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

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

(See Fig.22.)

From the back side of the front cabinet assembly, remove the two screws Z retaining the deck mechanism bracket. (See Fig.23.)

While pushing the arm section i of the technical door in the direction of the arrow, remove the shaft section j of the technical door from the front cabinet assembly. (See Fig.23.)

While pushing the technical door arm section k in the direction of the arrow, remove the shaft section m of the technical door from the front cabinet assembly. (See Fig.23.)

Take out the technical door from the back side of the front cabinet assembly.

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

Cassette door cover

Arm section i

Shaft section j

Torsion spring

Fig.21

Front cabinet assembly

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

Fig.22

Front cabinet assembl

Deck mechanism bracket

Fig.23

Torsion spring

Claw h

Technical door

Arm section k

Shaft section m

1-10

Remove the left and right side plates. Remove the top cabinet. Remove the front cabinet assembly. Remove the CD mechanism assembly.

Removing the CD & MCU board

(See Figs. 1 and 2.)

From the bottom side of the CD mechanism assembly, remove the two screws A retaining the CD & MCU board. (See Fig.1.)

Disengage the two board lock supports retaining the CD & MCU board. (See Fig.1.)

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

(See Figs.1 and 2.)

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

(See Fig.2.)

Board lock support

CD & MCU board

Fig.1

CN704

UX-M5

CN702

CD pickup unit

Disconnect the card wire from the connector CN704 on the CD & MCU board, and take out the CD & MCU board. (See Fig.2.)

[Cautions] Be sure to solder the short land part a on the CD pickup unit before disconnecting the card wire from the CD pickup assembly. (See Fig. 2.) 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 a after connecting the card wire.

Removing the CD pickup assembly

(See Fig. 3.)

Remove the CD & MCU board.

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

CN703

CD pickup assembly

CD mechanism assembly

CD pickup assembly

Damper(Gray)

Short land part a

Fig.2

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.

Damper(Blue)Damper(Gray)

Fig.3

1-11

+ 25 hidden pages

JVC UX M5 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Preventing static electricity

Important for laser products

Disassembly method