JVC UX-Q3A, UX-Q3B, UX-Q3S, UX-Q3W Service Manual

SERVICE MANUAL

MICRO COMPONENT SYSTEM

MB343200412

UX-Q3S,UX-Q3W,UX-Q3A,UX-Q3B

Area suffix (UX-Q3S)

UF -------------- China UT --------------- Taiwan A ---------------- Australia

(CA-UXQ3S)(SP-UXQ1S)

(CA-UXQ3W)(SP-UXQ1W)

(CA-UXQ3A)(SP-UXQ1A) (CA-UXQ3B)(SP-UXQ1B)

Area suffix (UX-Q3W,UX-Q3A)

UF -------------- China UT --------------- Taiwan

Area suffix (UX-Q3B)

UF -------------- China

(SP-UXQ1S)

(SP-UXQ1W)

(SP-UXQ1A) (SP-UXQ1B)

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-29

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31

No.MB343

2004/12

SPECIFICATION

CD receiver (CA-UXQ3S)

Amplifier Output power 20 W + 20 W at 4 Ω (10% THD)

Input terminals (Analogue) AUX × 1

LEVEL1:500 mV/47 kΩ LEVEL2:250 mV/47 kΩ

Output terminals (Analogue) Speaker × 1, 20 W/4 Ω

Impedance 4 Ω - 16 Ω Headphone ( × 1), 25 mW/32 Ω Impedance 16 Ω - 1 kΩ

Tuner Frequency FM 87.50 MHz - 108.00 MHz

AM 522 kHz - 1 710 kHz (A only)

530 kHz - 1 710 kHz , 531 kHz - 1 710 kHz

CD player Playable discs Audio CDs, MP3

Cassette deck Frequency response Normal (type l):60 Hz - 14 000 Hz

Wow and flutter 0.15% (WRMS)

General Power requirement AC 240 V , 50 Hz

Power consumption 55 W (at operation) 1 W (on standby)

Dimensions 165 mm (W) × 200 mm (H) × 355 mm (D)

Mass (approx.) 4.6 kg

Micro component system (UX-Q3S)

Dimensions 435 mm (W) × 200.5 mm (H) × 355 mm (D)

Mass (approx.) 8.4 kg

Specifications are subject to change without prior notice.

1-2 (No.MB343)

SECTION 1

PRECAUTION

1.1 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 manufacturers 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 reassembling.

(5) Leakage shock hazard testing

After reassembling 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, 1,000Ω per volt or more sensitivity in the following manner. Connect a 1,500Ω 10W resistor paralleled by a 0.15µF AC-type capacitor between an ex-

posed 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 measure 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.).

AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity)

0.15 F AC TYPE

Place this probe on

1500 10W

Good earth ground

1.2 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.

1.3 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.

1.4 Critical parts for safety

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. (This regulation dose not Except the J and C version)

each exposed metal part.

(No.MB343)1-3

1.5 Preventing 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.

1.5.1 Grounding to prevent damage by static electricity

Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as laser products. Be careful to use proper grounding in the area where repairs are being performed.

(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) 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 palate

(3) Handling the optical pickup

• 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.)

• 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.

1.6 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) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.

1.7 Attention when traverse unit is decomposed

*Please refer to "Disassembly method" in the text for the pickup unit.

• Apply solder to the short land sections before the flexible wire is disconnected from the connecto on the servo board. (If the flexible wire is disconnected without applying solder, the pickup may be destroyed by static electricity.)

• In the assembly, be sure to remove solder from the short land sections after connecting the flexible wire.

1-4 (No.MB343)

Pickup

Connector

Card wire

1.8 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 CD,MD and DVD player uses invisible

laser radiation and is equipped with safety switches which

prevent emission of radiation when the drawer is open and

the safety interlocks have failed or are defeated. 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 here in may result in

hazardous radiation exposure.

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

REPRODUCTION AND POSITION OF LABELS

WARNING LABEL

CAUTION : Visible and Invisible

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

CLASS 1 LASER PRODUCT

ADVARSEL : Synlig og usynlig laserstråling når maskinen er åben eller interlocken fejeler. Undgå direkte eksponering til stråling. (d)

CAUTION : Visible and Invisible laser radiation when open and interlock failed or defeated. AVOID DIRECT EXPOSURE TO BEAM. (e)

VARNING : Synlig och osynling laserstrålning när den öppnas och spärren är urkopplad. Betrakta ej strålen. (s)

VARO : Avattaessa ja suojalukitus ohitettuna tai viallisena olet alttiina näkyvälle ja näkymättömälle lasersäteilylle. Vältä säteen kohdistumista suoraan itseesi. (f)

ADVARSEL : Synlig og usynlig laserstråling når maskinen er åben eller interlocken fejeler. Undgå direkte eksponering til stråling. (d)

VARO : Avattaessa ja suojalukitus ohitettuna tai viallisena olet alttiina näkyvälle ja näkymättömälle lasersäteilylle. Vältä säteen kohdistumista suoraan itseesi. (f)

(No.MB343)1-5

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe ADJUSTMENT.

1-6 (No.MB343)

SECTION 3

DISASSEMBLY

3.1 Main body section

3.1.1 Removing the rear cover (See Figs.1 and 2)

(1) From the back side of the main body, remove the six

screws A attaching the rear cover. (See Fig.1.)

(2) From the bottom side of the main body, remove the three

screws B attaching the rear cover. (See Fig.2.)

(3) Remove the rear cover from the main body.

Rear cover

A A

Fig.1

Rear cover

Fig.2

(No.MB343)1-7

3.1.2 Removing the side panels (L)/(R)

(See Fig.3)

• Remove the rear cover. (1) From the bottom side of the main body, remove the two

screws C attaching the side panels(L)/(R).

(2) Slide the side panels(L)/(R) in the direction of the arrow and

remove the side panels(L)/(R).

Side panel(R)

3.1.3 Removing the top cover

(See Figs.4 and 5)

• Remove the rear cover and side panels(L)/(R). (1) From the left side of the main body, disconnect the card

wires from the connectors (CN703 board. (See Fig.4.)

(2) Remove the screw D and divider attaching the top cover.

(See Fig.4.)

(3) From the right side of the main body, disconnect the card

wire from the connector CN105 Fig.5.)

(4) Disconnect the wire from the connector CN108 on the main

board. (See Fig.5.)

(5) From the both sides of the main body, remove the two

screws E attaching the top cover. (See Figs.4.)

(6) From the right side of the main body, remove the screw F

and divider attaching the top cover. (See Figs.5.)

(7) Release the joints a and remove the top cover. (See Figs.4

and 5.)

, CN709) on the micon

on the main board. (See

Top cover

CN703 CN709

Top cover

Side panel(L)

Fig.3

Fig.4

CN108

Micon board

CN105

Divide

1-8 (No.MB343)

Main board

Fig.5

3.1.4 Removing the front panel assembly (See Figs.6 to 8)

• Remove the rear cover, side panels(L)/(R) and top cover.

(1) From the left side of the main body, disconnect the card

wires from the connectors (CN702 board. (See Fig.6.)

(2) From the right side of the main body, disconnect the earth

wire from the micon board. (See Fig.7.)

(3) From the both sides of the main body, release the joints b.

(See Figs.6 and 7.)

(4) From the bottom side of the main body, release the joint c.

(See Fig.8.)

(5) Remove the front panel assembly.

, CN710) on the micon

CN710 CN702

Micon board

Front panel assembly

Fig.6

Earth wire

Front panel assembly Micon board

Fig.7

Front panel assembly

Fig.8

(No.MB343)1-9

3.1.5 Removing the fan (See Figs.9 and 10)

• Remove the rear cover, side panels(L)/(R) and top cover.

(1) From the back side of the top cover, remove the screw G

attaching the fan. (See Fig.9.)

(2) Take out the fan.

Reference:

When attaching the fan, pass the wire through the slot d. (See Fig.10.)

3.1.6 Removing the tuner bracket and tuner (See Figs.9 and 10)

• Remove the rear cover, side panels(L)/(R) and top cover.

(1) From the back side of the top cover, remove the two screws

H attaching the tuner bracket. (See Fig.9.)

(2) From the inside of the top cover, remove the screw J at-

taching the tuner bracket. (See Fig.10.)

(3) Remove the tuner bracket and tuner.

Fan

Tuner bracket

3.1.7 Removing the cassette mechanism assembly (See Fig.10)

• Remove the rear cover, side panels(L)/(R) and top cover.

(1) From the inside of the top cover, remove the four screws K

and screw L attaching the cassette mechanism assembly.

(2) Remove the cassette mechanism assembly.

Reference:

When attaching the screws J, attach the shield with them.

Fig.9

Cassette mechanism assembly

Shield

dFanTuner

1-10 (No.MB343)

Tuner bracket

Fig.10

+ 22 hidden pages