JVC XL-PM11, XL-PM1 Service Manual

SERVICE MANUAL

PORTABLE CD PLAYER

XL-PM11/XL-PM1

Area Suffix

XL-PM11

C --------------------- Canada

XL-PM11/XL-PM1

REPEAT

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ESP

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PA I G

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Model XL-PM11 is an exclusive use for Canada. As for the difference between XL-PM11 and XL-PM1, the packing specification is different.

XL-PM11

Gift box

XL-PM1

Blister packPACKING

Area Suffix

XL-PM1

J ------------------------ U.S.A. C --------------------- Canada B -------------------------- U.K. E ------ Continental Europe

COMPACT

DIGITAL AUDIO

Contents

Safety Precautions Important for laser products Preventing static electricity Disassembly method Troubleshooting

1-2 1-3 1-4 1-5 1-7

Explanation of MP3 Description of major ICs Parts list

1-8 1-9 1-13 ~18

No.21018

Jul. 2001

XL-PM11/XM-PM1

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. When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer. (Except the J and C version)

1-2

Important for laser products

XL-PM11/XM-PM1

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 which

prevent 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.

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

Reproduction and position of labels

WARNING LABEL

B, E version J, C version

Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check.

CLASS 1 LASER PRODUCT

(Cabinet -bottom)

DHHS LABEL

(Cabinet -door/ inside)

1-3

XL-PM11/XM-PM1

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

In the equipment which uses optical pick-up (laser diode), optical pick-up is destroyed by the static electricity of the work environment. 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

Conductive material (conductive sheet) or iron plate

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.

4. 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.

Attention when CD mechanism assembly is decomposed

*Please refer to "Disassembly method" in the text for pick-up and how to detach the CD mechanism assembly.

Remove the door & middle cabinet.

Solder the short-circuit land on the flexible board, before the flexible board is removed from connector CON1 on the main board. (When the flexible board is removed without putting up solder, the CD mechanism assembly might destroy.)

Please unsolder the short-circuit land after connecting the flexible board with the CON1 on the main board, when you install CD mechanism assembly in the substrate.

Flexible board

CD mechanism assembly

short-circuit land

CON1 on the main board

1-4

XL-PM11/XM-PM1

Disassembly method

Removing the cabinet -door & cabinet

-middle (See Fig.1 to 4)

Remove the two screws A attaching the cabinet door on the back of the body.

Remove the two screws B on the cabinet -bottom.

Remove the three screws C attaching the cabinet middle and remove the cabinet -middle from the cabinet -bottom.

ONE POINT:

Disconnect the flexible board from connector FRW000 on the main board, and remove the cabinet

-door with cabinet -middle.

Flexible board is bonded with coupleface tapes internally in the cabinet middle.

Cabinet -bottom

Fig.1

Cabinet -door

Cabinet -middle

Cabinet -bottom (inside)

Cabinet -door (inside)

Cabinet -middle (inside)

Flexible board

Cabinet -middle

(The photograph is one of

Fig.2

the B and E version. )

Cabinet -bottom

Main board

Fig.4

FRW000

Fig.3

(The photograph is one of

the B and E version. )

1-5

XL-PM11/XM-PM1

Removing the CD mechanism (See Fig.5)

Prior to performing the following procedure, remove the cabinet -door and cabinet -middle.

Disconnect the harness(motor) from connector CON2(MOW000) on the main board .

Disconnect the flexible board(pick-up) from connector CON1 on the main board and remove the CD mechanism.

Attention

Solder the short-circuit land on the flexible board, before the flexible

Flexible board

Short-circuit

board is removed from connector OCN1 on the main board.

When reassembling, unsolder the short-circuit land on the flexible board after connecting the flexible board.

ONE POINT :

(Note : See page 1-4)

Flexible board is bonded with a

CON1

couple-face tape on the bottom cabinet.

Removing the main board & EXT battery terminal board (See Fig.6)

Prior to performing the following procedure, remove the cabinet -door, cabinet -middlet and CD mechanism.

land

Cabinet -bottom(inside)

CD mechanism

Flexible board

CON1

CON2

(MOW000)

Main board

Fig.5

EXT battery terminal board

Cabinet -bottom

(inside)

Remove the screw D attaching the EXT battery termial board, and remove the main board with the EXT battety terminal board.

Removing the system control board (See Fig.7a and 7b)

Prior to performing the following procedure, remove the cabinet -door and cabinet -middle.

Remove the eight screws E attaching the metal cover (Peel off the warning label if necessary).

Remove the metal cover and system control board.

Disconnect the flexible board from connecter CON4 on the system control board.

System control

(Display board)

board

CON4

Fig.6

Cabinet -door (inside)

Main board

Metal cover

Flexible board

1-6

Flexible board

Fig.7aFig.7b

+ 14 hidden pages