JVC HX Z3J Service Manual

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SERVICE MANUAL

COMPACT COMPONENT SYSTEM

No.21112

Aug. 2002

HX-Z3

Area Suffix

J ------------------------- U.S.A.

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

Safety precautions

Preventing static electricity

Important for laser products

Importance administering

point on the safety

Disassembly method

Contents

Adjustment method

Flow of functional operation

until TOC read (CD)

Maintenance of laser pickup

Replacement of laser pickup

Description of major ICs

1-2

1-3

1-4

1-5

1-6

1-22

1-27

1-28

1-29~37

1-2

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.).

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.

Good earth ground

Place this

probe on

each exposed

metal part.

AC VOLTMETER

(Having 1000

ohms/volts,

or more sensitivity)

1500 10W

0.15 F AC TYPE

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.)

1-3

HX-Z3

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.

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

Conductive material

(conductive sheet) or iron plate

(caption)

Anti-static wrist strap

Attention when traverse unit is decomposed

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.

*Please refer to "Disassembly method" in the text for pick-up and how to

detach the CD traverse mechanism.

Soldering

Fig.1

Fig.2

CD changer

mechanism

assembly

CD traverse

unit

Flexible cable

1-4

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.

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.

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.

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

CAUTION

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

1-5

HX-Z3

Importance administering point on the safety

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.

1-6

HX-Z3

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.

Removing the metal cover

(See Fig.1 ~ 3)

Prior to performing the following procedure, remove

the metal cover.

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.

Removing the CD changer mechanism

assembly (See Fig.4, 5)

Do not break the front panel tab fitted to

the metal cover.

CAUTION:

Do not damage the CD fitting when

removing the CD changer mechanism

assembly.

CAUTION:

Disassembly method

Metal cover

Fig.1

Fig.2

Fig.3

Fig.5Fig.4

Front panel assembly

CD changer mechanism assembly

Rear part

CD changer

mechanism assembly

CD servo control board

CN651

CN151

1-7

HX-Z3

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.

Remove the three screws E attaching the front

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.

Removing the front panel assembly

(See Fig.6 ~ 9)

Front panel need to be tilt a little bit as release

from bottom chassis.

REFERENCE:

Keep the plastic rivet for reuse.

REFERENCE:

Front panel assembly

Fig.6

Fig.7

Fig.8

Fig.9

Bridge board

CN701

Bridge board

CN701

Main board

CN870

Joint a

Primary board

CN231, CN232

Primary board

CN231, CN232

Plastic rivet

Band

Inner bar

Bottom chassis

CN44

1-8

HX-Z3

Prior to performing the following procedure, remove

the metal cover.

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.

Removing the antenna board

(See Fig.10, 11)

There is no need to remove the CD

changer mechanism assembly.

REFERENCE:

Fig.10

Fig.11

Rear panel

CN1

Antenna board

Band

1-9

HX-Z3

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.

Removing the rear panel

(See Fig.12 ~ 16)

Fan assembly will come off with rear

panel.

REFERENCE:

Fig.12

Fig.14

Fig.13

Fig.15

Fig.16

Inner bar

Holding board

Plastic rivets

Fan assembly

Rear panel

Joint c

Fan assembly

CN206

Tie band

Joint b

Bridge board

1-10

HX-Z3

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.

Rotate fan assembly in clockwise direction to release

fan assembly from rear panel (joints d).

Removing the fan assembly

(See Fig.19, 20)

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 T.flux board

(See Fig.17, 18)

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.

Removing the main board (See Fig.21)

Rear panel

Fig.19

Fig.18

Fig.17

Fig.20Fig.21

Joint d

Fan assembly

CN217

CN504

CN311

CN44

Joint e

Main board

CN870

T.flux board

Inner bar

Rear panel

Front assembly

Joint y

Inner bar

Joint y

Plastic rivet

T.flux board

CN102

T.flux board

1-11

HX-Z3

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.

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.

Removing the bridge board / regulator

board / heat sink (See Fig.22 ~ 27)

Fig.23

Fig.25

Fig.24

Inner bar

Plastic rivet

Bridge board

Regulator board

Plastic rivet

Fig.22

Joint g

Joint f

Bridge board

CN701

Primary board

CN213

Tie band

Primary board

CN214

Heat sink

Heat sink bracket

CN213

CN212

CN214

1-12

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.

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.

CAUTION:

Heat sink bracket

Fig.26

Fig.27

Heat sink

Bridge board

Regulator board

CN215CN205

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