JVC UXM-5 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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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Removing the tray motor

(See Figs. 4 to 7.)

Remove the CD & MCU board.

From the top side of the CD mechanism assembly, open up the claws b and c at the left and right of the clamper assembly and lift the assembly to remove it. (See Fig.4.)

Push the section d of the elevator in the direction of the arrow and lower the CD pickup assembly.

(See Fig.5.)

Pull out the tray. (See Fig.5.)

While opening up the claws e at the left and right of the tray in the directions of the arrows, remove the tray. (See Fig.6.)

While pushing the claw f on the CD mechanism assembly downwards, slide the elevator fully in the direction of the arrow. (See Fig.7.)

Lift the gear slightly, remove the transparent cover.

(See Fig.7.)

CD mechanism assembly

Claw b

Claw c

Fig.4

CD pickup assembly

Clamper assembly

Claw c

Tray

Remove the belt from the tray motor pulley.

(See Fig.7.)

Remove the two screws C retaining the tray motor and remove it from the bottom side of the CD mechanism assembly. (See Fig.7.)

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

Fig.5

Section d

TrayClaw e

Claw e

Fig.6

CD mechanism assembly

Claw f

Tray motor pulley

Gear

1-12

Fig.7

Transparent

Belt

cover

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Replacing the CD pickup unit (See Figs. 8 to 11.)

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

Remove the left and right side plates. (See Figs.4 to 7 of "Main body section" on page 1-7.)

Remove the top cabinet. (See Figs.8 and 9 "Main body section" on page 1-8.)

From the top side of the main body, open up the claws b and c on the left and right of the clamper assembly in the direction of the arrows and lift the assembly to remove it. (See Fig.8.)

Push the section d on the elevator of the CD mechanism assembly and lower the CD pickup assembly. (See Fig.9.)

Pull out the tray. (See Fig.10.)

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

(See Fig.10.)

Clamper assembly

Claw c

Claw b

Front cabinet assembly

Claw c

Fig.8

Front cabinet assembly

Loosen the two screws D retaining the shaft.

(See Fig.10.)

Turn the CD pickup unit upside down and apply solder to the short land part a. (See Fig.11.)

Disconnect the card wire from the CD pickup unit and replace the unit. (See Fig.11.)

[Caution] Be sure to solder the short land part a on the CD pickup unit before disconnecting the card wire from the CD pickup unit (see Fig. 11). 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. [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. 11).

Feed middle gear

Sliding spring

(To be loosened)

Card wire

Fig.9

CD pickup assembly

(To be loosened)

Fig.10

d section

TraySlit washer

Short land part a

.11

1-13

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Adjustment method

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 VT702 : For playback frequency VT702 : 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 : Speaker output 0dBs(2.8V) 8 ohm H.phone output -10dBs(0.245V) 32 ohm

Cassette amplifier section Reference output : Speaker output 0dBs(2.8V) 8 ohm H.phone output -10dBs(0.245V) 32 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 AC220V/60Hz

1-14

Cassette amplifier section

Item Measuring condition Check and adjustment procedure Standard value Adjusting part Head azimuth adjustment

Tape speed and wow/flutter check and adjustment

PB frequency response check

Bias frequency check

REC and PB frequency response adjustment

Test tape: VT702 (8kHz) Signal output terminal: PHONES (with 32 ohm load)

Test tape: VT712 (3kHz) Signal output terminal: PHONES (with 32 ohm load)

Test tape: VT702 Signal output terminal: PHONES (with 32 ohm load) Tape: Normal Signal output terminal: Cassette REC./PLAY HEAD

Test tape: AC225 Signal input: FM 22.5 DEV 60dBu with emphasis Signal output terminal: PHONES (with 32 ohm load)

Play back the test tape VT702 (8kHz).

1. Adjust the head azimuth adjusting screw so that the

2. phase difference between the R and L channels is minimized at an output level that is within (0+2dB-2dB) of the maximum output level. After this adjustment, lock the head azimuth adjusting screw with screw sealant to cover more than a half of the screw head.

When the head azimuth is maladjusted, correct it with the head azimuth adjusting screw. Play back the test tape VT712 (3kHz) by the end

1. portion. Connect a frequency counter and check that it reads

2. between 2940 and 3090Hz. If not, adjust the frequency with the motor semifixed resistor. Check that the wow/flutter is within 0.38%

3. (unweighted).

Play back the test tape VT702 while con-firming that deviation between the 1kHz signal and 8kHz signal should be (0+3dB-6dB).

Set the TUNER or CD function and with TAPE to record. Check to see if the frequency at the measuring point P201 is (67kHz+1kHz-1kHz) if not adjust L203 until the frequency counter indicates (67kHz+1kHz

-1kHz). At TUNER, set the BAND to the FM position, and record the reference 1kHz signal and 8kHz signal alternately repeatedly. While playing back the recorded signal differ from that of the 1kHz signal by within (0+3dB-6dB).

Output level: Within (0+2dB-2dB) of maximum output level Phase difference R and L channels: Minimum

2940 to 3090Hz

Within 0.38% (unweighted)

Deviation between 1kHz and 8kHz: (0+3dB-6dB)

Level difference between REC and PB: Within (0+3dB-6dB)

Tuner section

Item Measuring condition Check and adjustment procedure Standard value Adjusting part

AM IF adjustment 1.

Signal input: Loop antenna Signal output: IC101 pin19

Set the intermediate frequency sweep generator to AM 450kHz. Adjust the T101 for maximum and center output.

2. T101

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Head azimuth adjusting screw (To be used only after head replacement) See Fig.1 on page 1-16.

Tape speed: Motor semifixed resistor

See Fig.2 on page 1-16. Check only

L203, P201 See Fig.3 on page 1-16.

See Fig.3 on page 1-16.

AM tracking adjustment

FM tracking adjustment

Signal input: Loop antenna Signal output: PHONES (with 32 ohm load)

Signal input: Dummy antenna FM ANT FM GND Signal output: PHONES (with 32 ohm load)

Set the TUNER at 522kHz, adjust the L101 until the

1. test point P107 voltage at (1.1V+0.1V-0.1V). Set the TUNER at 1629kHz, check the test point P107

2. voltage at (7.0V+0.3V-0.3V). Set the TUNER and S/G at 603kHz, adjust the L102

3. for maximum output. Set the TUNER and S/G at 1404kHz, adjust the TC101

4. for maximum output. Repeat the above steps 3 and 4.

Set the TUNER at 87.5MHz, adjust the L104 until the

1. test point P105 voltage at (2.3V+0.1V-0.1V). Set the TUNER at 108MHz, check the test point P105

2. voltage at (6.5V+0.3V-0.3V). Set the TUNER and S/G at 90.1MHz, adjust L103 for

3. maximum output. Set the TUNER and S/G at 106.1MHz, adjust the

4. TC102 for maximum output. Repeat the above steps 3 and 4.

L101, P107

L102

TC101 See Fig.3 on page 1-16.

L104, P105

L103

TC102 See Fig.3 on page 1-16.

1-15

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Location of adjusting parts

Cassette mechanism section

CASSETTE MOTOR

Tape Speed Adj.

Fig.1 Head azimuth adjustment

Main board (Forward side)

Note: Measuring points (P105, P107 and P201) are located on the reverse side.

P105

(FM VT)

L104

(FM OSC)

TC101

(AM RF)

L101

(AM OSC)

L102

(AM RF)

TC102

(FM RF)

L103

(FM RF)

P107

(AM VT)

IC101

Fig.2

T101

(AM IF)

Fig.3

P201

(BIAS FREQUENCY)

L203

(BIAS FREQUENCY ADJ.)

1-16

Flow of functional operation until TOC read

UX-M5

Power ON

Slider turns REST SW ON.

Laser ON

Focus start

FOK

Turn on focus servo

Confirm that the voltage at the pin5 of CN703 is "H"/"L"/"H"

Check that the voltage at the pin10(LD) of CN704 is +1.35V.

Caution

Before connecting a measuring instrument to the measuring point, turn the power of the main unit to OFF. After performing a measurement and before disconnecting the measuring instrument, again turn the power of the main unit to OFF. (If a measuring instrument is disconnected while an electric current is being output to the main unit, the pick up of the main unit will be damaged.)

Disc spinning

Radial_error scaling

PLL Lock

Turn on radial servo

Read TOC

Check that the voltage at the pin1 and pin2 of CN703 is +0.65V.

Confirm the eye-pattern at the pin25 (RFGO) of IC704 on the CD & MCU board.

1-17

UX-M5

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.

The level of RF output (EFM output:ampli tude of eye pattern) will below.

Is the level of

RF OUT 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 "Removing the CD pickup" on the previous page)

Plug the power cord in,and turn the power on. At this time,check that the laser emits for about 3 seconds and the objective lens moves up and down. Note: Do not observe the laser beam directly.

Play a disc.

Check the eye-pattern at the pin25 (RFGO) of IC704 on the CD & MUC board.

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 would be adjusted when the pickup operates normally,the laser pickup may be damaged due to excessive current.

1-18

Trouble shooting

UX-M5

Circuit Symptom Cause

No soundGeneral

FM Connect the built-in or external antenna.

No sound, weak sound (Low sensitivity)

Speakers are not connected.

Wrong function is selected.

Defective volume control

Defective earphone jack

Defect in IC402

Defect in IC301 Improper location of unit

Defect in IF T101

Defect AM antenna coil L102 or oscilloscope coil L101

Intermediate frequency tuning faulty

RF tracking faulty

Defective IC101

Defective IC102

Poor contact in antenna circuit FM antenna not connected

Defective band selector switch

Check the speaker connection.

Set switch to the proper position.

Set the volume control to a proper sound level.

Replace the earphone jack.

Check voltages. Replace if necessary.

Check voltages. Replace if necessary. Rotate or reposition the unit.

Check resistance, voltage, and current. Replace as needed.

Replace if necessary.

Readjust (see "Adjustment method").

Check voltages. Replace if necessary.

Check resistance and resolder.

Replace or repair the switch.

Remedy

Defective IC101

Defective IC102

Intermediate frequency tuning faulty

Poor contact in FM antenna circuit

Tape Clean the capstan or head with alcohol.

CD Insert disc correctly.

No sound/recording, unsteady tape sound, weak sound

Cannot read the table of content. No sound

Dirty capstan or head

Irregular cassette tape winding

Defective IC201

Defective IC202

Cassette erasure prevention tabs broken out

Disc is inserted upside down.

Disc is dirty.

Disc is scratched.

Disc is seriously warped.

A non-standard disc has been inserted.

Moisture has formed inside the CD deck.

Defective IC701

Defective IC704

Check voltages. Replace if necessary.

Readjust (see "Adjustment method").

Resolder or repair as required.

Replace tape.

Check voltages. Replace if necessary.

Replace tape or cover tab openings with adhesive tape.

Wipe clean with a soft cloth.

Use a new disc.

Use only a brand name disc.

Wait about 20 to 30 minutes.

Check voltages. Replace if necessary.

Defective IC703

Defect in the CD pickup mechanism

Check voltages. Replace if necessary.

Replace as required.

1-19

+ 42 hidden pages

JVC UXM-5 Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual