JVC XM-PX5SL Service Manual

SERVICE MANUAL

PORTABL MINIDISC PLAYER

XM-PX5SL

Contents

Safety Precautions Attention when MD pickup is exchanged Important for Laser Products Disassembly method Maintenance of MD pickup Procedures of changing the MD pickup Adjustment method Description of major ICs

This service manual is printed on 100% recycled paper

Areas suffix

B --------------------------------- U.K. E ------------- Continental Europe EN -------------- Northern Europe

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No.20849

Jul. 2000

XM-PX5SL

Safety Precautions

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 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.).

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.

Warning

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.

CAUTION

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.

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Attention when MD pick up is exchanged

1. About the static electricity protection measures

The laser diode in the traverse unit (optical pick up) is easy to be destroyed by clothes and the human body to the electrified static electricity. Please note the explosion by static electricity when repairing.

2. About the earth processing for the electrostatic destruction prevention

In the equipment which uses an optical pick up (laser diode), an optical pick up is destroyed by the static electricity of the work environment. Please do the earth processing and work.

1) Earth of work stand Please pull the conductive material (conductive sheet) or the iron plate to the depository place of the traverse unit (optical pick up), and take the earth to ground.

2) Human body earth Please use the anti-static wrist strap to exhaust the electrified static electricity to the human body.

anti-static wrist strap

XM-PX5SL

Conductive material (conductive sheet) or the iron plate

3. Handling the optical pick up

1) Please return according to a correct procedure based on short processing after exchanging parts.

2) Do not use a tester to check the condition of the laser diode in the optical pick up .The tester 's internal power source can easily destroy the laser diode.

4. Attention when unit is disassembled

Please refer to "Disassembling method" for how to detach .

1) Please be sure to solder before a flexible wire is removed from connector CN301 on a main printed circuit board as shown in Figure 2. if you removes without soldering.the MD picking up assembly might destroy

2) When installing , solder in the part of short round should be removed after a flexible wire is connected with CN301

solders.

CN301

Fig 1

Fig 2

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XM-PX5SL

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

DANGER : Invisibie laser radiation when open and interlock or defeated. AVOID DIRECT EXPOSURE TO BEAM (e)

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



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

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

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

XM-PX5SL

Disassembly method

Removing the MD door ass’y

(See Fig.1 and 2)

Open the door by moving the eject knob.

Remove the four screws A attaching the MD door assy. Detach the MD door ass'y from the main body.

Removing the holder ass’y

(See Fig.3 and 4)

Turn the holder ass’y as shown in Fig.3.

Pull the side arm (L) marked a outward, then remove. Open the holder ass’y as shown in Fig.4.

Move the U-shaped notch marked b in the direction of the arrow and release it from the shaft.

Move the part c inward and pull out the holder ass’y from the shaft.

MD door ass'y

Eject knob

MD door ass’y

Fig.1

Fig.2

Eject knob

ATTENTION:

U-shaped notch

When reassembling, first reattach the part c to the shaft of the chassis ass’y. And next, fit the U-shaped notch to the shaft.

Holder ass'y

Fig.3

Shaft

Fig.4

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XM-PX5SL

Removing the chassis ass’y (See Fig.5 and 6)

Remove the two screws B and the one screw C attaching the chassis assy. Remove the one screw D attaching the jack cover.

Open the battery lid and release the tab d from the battery contact. Pull out the battery lid.

Remove the one screw E attaching the arm (L).

Remove the chassis ass’y and the arm (L) while releasing them from the headphone jack on the bottom case.

Removing the main P.W. board and the battery holder(See Fig.7 and 8)

Use a soldering bit provided with ground to solder or unsolder the short round.

Ground the set and the P.W.board. The voltage level of the ground should be equal to that of the soldering bit.

Bottom case

Battery lid

Chassis ass'y

Fig.5

Headphone jack

Jack cover

Prevent static electricity using an earth band, etc.

Solder the short round of the pickup FRC for short circuit.

Disconnect the flexible wires from the connector CN301 and CN801 on the main P.W.Board.

Remove the one screw F attaching the main P.W.board. Remove the main P.W.board and the battery holder, then reverse them.

Disconnect the flexible wire from connector CN601 on the main P.W.board.

Unsolder the soldered joint of the main P.W.board and the battery holder P.W.board.

Battery holder

MD mechanism ass'y

Battery holder

Arm (L)

Fig.6

Soldering

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CN601

Main P.W.board

CN401

Pickup short round

CN301

Main P.W.board

Fig.7Fig.8

XM-PX5SL

Removing the spindle motor(See Fig.9)

Unsolder the part d of the flexible wire extending from the underside of the chassis ass’y to the spindle motor. At this time, do not spill flux on the gear and others.

Remove the three screws F attaching the spindle motor and detach it from the chassis ass’y.

Removing the pickup unit(See Fig.9)

Remove the slit washer and the worm gear from the underside of the chassis ass’y.

2. Remove the screw G attaching the shaft holder, then detach the shaft.

Pull out the part f and g in the directions of the arrows to remove the pickup unit and the lead screw.

Worm gear

Lead screw

Slit washer

Pickup unit

Shaft holder

Fig.9

Spindle motor

Removing the pickup(See Fig.10 and 11)

Remove the screw H attaching the lead spring, then detach the lead spring.

Pull out the shaft from the pickup.

ATTENTION:

When handling the pickup unit, touch the parts marked in Fig.11 only.

Lead screw

Lead spring

Pickup

Fig.10

Touch these parts only.

Fig.11

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XM-PX5SL

Removing the feed motor(See Fig.12)

Peel off the part h of the flexible wire on the underside of the feed motor.

Unsolder the solder joint j connecting the flexible wire to the feed motor.

Peel off the part i of the flexible wire.

Remove the two screws I attaching the feed motor on the upper side of the chassis ass’y.

ATTENTION:

When reassembling, reattach the flexible wire with an adhesive tape and solder the appropriate part.

Removing the SW P.W.B ass’y

(See Fig.13)

Feed motor

Chassis

Fig.12

Remove the SW P.W.B ass’y attached to the side of the chassis ass’y with the double-sided tape.

When reassembling, reattach the SW P.W.B ass’y with an adhesive tape as before.

SW P.W.B ass'y

Fig.13

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