JVC HX Z3J Service Manual

SERVICE MANUAL

COMPACT COMPONENT SYSTEM

HX-Z3

Contents

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

1-2 1-3 1-4

1-5 1-6

Adjustment method Flow of functional operation until TOC read (CD) Maintenance of laser pickup Replacement of laser pickup Description of major ICs

Area Suffix

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

1-22

1-27 1-28 1-28 1-29~37

No.21112

Aug. 2002

HX-Z3

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 m ust 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 pr inted 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

HX-Z3

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 traverse unit is decomposed

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

1. Remove the disk stopper and T. bracket on the CD changer mechanism assembly.

2. Disconnect the harness from connector on the CD motor board.

3. CD traverse unit is put up as shown in Fig.1.

4. Solder is put up before the card wire is removed from connector CN601 on the CD servo control board as shown in Fig. 2. (When the wire is removed without putting up solder, the CD pick-up assembly might destroy.)

5. Please remove solder after connecting the card wire with CN601 when you install picking up in the substrate.

CD changer mechanism

assembly

CD traverse

unit

Flexible cable

Fig.1

Soldering

Fig.2

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HX-Z3

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

1-4

Importance administering point on the safety

HX-Z3

Caution: For continued protection against risk of fire, replace only with same type 2.5A/125V for F103, 5A/125V for F001 and 6A/125V for F101, F102. This symbolspecifies type of fast operating fuse.

Precaution: Pour evitisques de fer reux, remplacez le fusible de surete de F103 comme le meme type que 2.5A/125V, et 5A/125V pour F001 et 6A/125V pour F101, F102. Ce sont des fusibles suretes qui functionnes rapide.

1-5

HX-Z3

Disassembly method

Removing the metal cover

(See Fig.1 ~ 3)

Remove the six screws A on the back of the body.

Remove the screw B on each side of the body.

Remove the metal cover from the body by lifting the rear part of the cover.

CAUTION:

Removing the CD changer mechanism assembly (See Fig.4, 5)

Prior to performing the following procedure, remove the metal cover.

Do not break the front panel tab fitted to the metal cover.

Metal cover

Fig.1

Disconnect the card wire from connector CN151 and CN651 on the CD servo control board on the right bottom of the CD changer mechanism assembly.

Remove the four screws C attaching the CD changer mechanism assembly on top of the body.

Remove the CD changer mechanism assembly while lifting the rear part.

CAUTION:

Front panel assembly

Do not damage the CD fitting when removing the CD changer mechanism assembly.

CD changer mechanism assembly

Rear part

Fig.2

Metal cover

Fig.3

CD servo control board

1-6

CD changer mechanism assembly

CN151

CN651

Fig.5Fig.4

HX-Z3

Removing the front panel assembly

(See Fig.6 ~ 9)

Prior to performing the following procedure, remove the metal cover and the CD changer mechanism assembly.

Disconnect the card wires from connector CN44 and CN870 on the main board on the right side of the body. Remove the screw D attaching the wire from extending from the underside of the front panel assembly.

Disconnect the wire from connector CN701 on the bridge board.

Cut the tie band.

Disconnect the wires from connector CN231 and CN232 on the primary board on the left side of the body and remove the band fixing the wire.

Remove the plastic rivet attaching the inner bar in the center of the front panel assembly.

Front panel assembly

Joint a

Primary board

CN231, CN232

Bridge board

CN701

CN44

Fig.6

Main board

CN870

Front panel assembly

REFERENCE:

Remove the three screws E attaching the front

Keep the plastic rivet for reuse.

panel assembly at the bottom of the body.

Release the two joints a on the lower left and right sides of the front panel assembly using a screwdriver, and remove the front panel assembly toward the front.

REFERENCE:

Front panel need to be tilt a little bit as release from bottom chassis.

Bottom chassis

Inner bar

Bridge board

CN701

Plastic rivet

Joint a

Fig.7

Front panel assembly

Band

Primary board

CN231, CN232

Fig.8

Front panel assembly

Fig.9

1-7

HX-Z3

Removing the antenna board

(See Fig.10, 11)

Prior to performing the following procedure, remove the metal cover.

Antenna board

CN1

Rear panel

REFERENCE:

Disconnect the card wire from connector CN1 on the antenna board on the right side of the body.

Remove the band attaching the antenna board.

Remove the two screws F on the rear panel on the back of the body.

There is no need to remove the CD changer mechanism assembly.

Band

Fig.10

Rear panel

1-8

Fig.11

Removing the rear panel

(See Fig.12 ~ 16)

Prior to performing the following procedure, remove the metal cover and the CD changer mechanism assembly.

Remove holding board by remove two plastic rivets and then slide out the holding board as shown in fig.

12.

Disconnect fan wire from connector CN206 on the bridge board.

Cut off the tie band that tied fan wire on inner bar.

Remove eight screws F from rear panel.

Detach joint b to release rear panel from inner bar.

Release joints c which on right bottom and left bottom of rear panel. The joint can be release by pull outward the side of rear panel.

Fan assembly

Joint b

Inner bar

Holding board

Fig.12

Tie band

HX-Z3

Plastic rivets

Inner bar

REFERENCE:

Joint c

Fan assembly will come off with rear panel.

Rear panel

Fig.15

Rear panel

Fan assembly

Bridge board

CN206

Fig.13

Rear panel

Fig.16

Fig.14

Joint c

1-9

HX-Z3

Removing the T.flux board (See Fig.17, 18)

Prior to performing the following procedure, remove the metal cover and the CD changer mechanism assembly .

Disconecct the card wire from connector CN102 on the T.flux borad.

Remove the two plastic rivets attaching the T.flux board.

Remove the T.flux board from the bracket which is located ont the inner bar.(two joints y)

Removing the fan assembly

(See Fig.19, 20)

Prior to performing the following procedure, remove the metal cover, the CD changer mechanism assembly and the rear panel.

Remove two screws G on the rear panel.

Front assembly

T.flux board

Fig.17

Inner bar

Joint y

Plastic rivet

Rear panel

Joint y

Rotate fan assembly in clockwise direction to release fan assembly from rear panel (joints d).

Removing the main board (See Fig.21)

Prior to performing the following procedure, remove the metal cover, the CD changer mechanism assembly, the antenna board and the rear panel.

Disconnect the card wires from connector CN44,CN504 and CN870 on the main board.

Remove the screw D attaching the main board.

Disconnect connector CN217 and CN311 on the main board outward and release from the base chassis (joint e) upward.

T.flux board

CN217

CN504

Inner bar

T.flux board

CN102

Fig.18

Rear panel

Fig.19

Joint d

Main board

1-10

CN870

CN44

CN311

Fan assembly

Joint e

Joint d

Fig.20Fig.21

HX-Z3

Removing the bridge board / regulator board / heat sink (See Fig.22 ~ 27)

Prior to performing the following procedure, remove the metal cover, the CD changer mechanism assembly, the rear panel, the antenna board and main board.

Remove the plastic rivet attaching the stay inner bar and remove the screw H on the bridge board.

Move the inner bar forward and upward to release from the front section (joint f) and from the bridge board (two joints g) respectively.

Remove the two plastic rivets setting the holding board fixing the bridge board and the primary board. Move the bracket board in the direction of the arrow.

Disconnect the wire from connector CN212, CN213 and CN214 on the primary board respectively and remove the band attaching the wires.

Disconnect the wire from connector CN701 on the bridge board.

Inner bar

Bridge board

Plastic rivet

Fig.22

CN213 CN212

Primary board

CN214

Joint f

Plastic rivet

Remove the two screws I attaching the heat sink bracket and move the heat sink in the direction of the arrow to release from the base chassis (two joints i). The bridge board and the regulator board come off with the heat sink.

Joint g

Bridge board

CN701

Fig.23

Tie band

Primary board

CN213 CN212 CN214

Fig.24

Bridge board

Regulator board

Heat sink bracket

Fig.25

Heat sink

1-11

HX-Z3

Remove the two screws J attaching the heat sink bracket.

Remove the two screws M, detach bridge board from regulator board by disconnect connector CN205.

Remove the two screws K and two screws L to detach regulator board from heat sink.

Bridge board

CAUTION:

As assembly back the regulator board and bridge board to heat sink. Regulator board must be assembly to heat sink first and screws K and L must be screwed before bridge board attach to regulator board.

Heat sink

Regulator board

Heat sink bracket

Fig.26

Heat sink bracket

Regulator board

Bridge board

Heat sink

Fig.27

CN215CN205

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