JVC UX-G120E, UX-G120EY Service manual

SERVICE MANUAL

MB748<Rev.002>201012SERVICE MANUAL

UX-G120E, UX-G120EY

MICRO COMPONENT SYSTEM

SP-UXG120

CA-UXG120

SP-UXG120

For Russian

Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade) Lead free solder used in the board (material : Sn-Cu, melting point : 230 Centigrade)

TABLE OF CONTENTS

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

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

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

No.MB748<Rev.002>

2011/1

SPECIFICATION

Main unit

Amplifier section

Output Power

Speakers/Impedance 4 Ω - 8 Ω

Terminal

AUDIO IN Input sensitivity/Impedance

FM tuner section

Tuning range 87.50 MHz - 108.00 MHz

CD player section

Dynamic range 60 dB

Signal-to-noise ratio 60 dB

Wow and flutter Immeasurable

Cassette deck section

Frequency response Normal (type I) 125 Hz - 8 kHz

General

Power requirement AC 230 V , 50 Hz

Power consumption 23 W (at operation)

Dimensions (approx.) 140 mm × 209 mm × 208 mm (W×H×D)

Mass (approx.) 2.2 kg

Type 1-way Bass reflex

Speaker units 8 cm cone × 1 Impedance 4 Ω Dimensions (approx.) 135 mm × 209 mm × 175 mm (W×H×D)

Mass (approx.) 1.2 kg each

3 W per channel, min. RMS,driven into 4 Ω at 1 kHz with no more than 10% total harmonic distortion. (IEC268-3)

500 mV / 50 kΩ

Wow and flutter 0.35% (WRMS)

1. 00 W or less (on standby)

Speakers

• Design and specifications are subject to change without notice.

1-2 (No.MB748<Rev.002>)

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.MB748<Rev.002>)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 card wire is disconnected from the connector on the servo board. (If the card 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 card wire.

1-4 (No.MB748<Rev.002>)

Solder short

1.CLASS 1 LASER PRODUCT

2.CAUTION :

(For U.S.A.) Visible and/or invisible class II laser radiation when open. Do not stare into beam. (Others) Visible and/or invisible class 1M laser radiation when open. Do not view directly with optical instruments.

3.CAUTION : Visible and/or invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure to beam.

4.CAUTION : This laser product uses visible and/or 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 and PRINT

WARNING LABEL and PRINT

Put on to inside

(No.MB748<Rev.002>)1-5

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

SECTION 3

DISASSEMBLY

3.1 Main body

3.1.1 Removing the Rear cover (See Fig.1, 2, 3) (1) Remove the four screws A, two screws B and two screws

C attaching the Rear cover. (See Fig.1)

(3) Disconnect the connector wire form Main board connected

to connector CN402

CN402

3.1.2 Removing the Rectifier board (See Fig.4)

(1) Disconnect the connector wires from Power transformer

connected to connectors CN401 er board.

(2) Disconnect the power cord connected to connector CN407

of the Rectifier board.

(3) Remove the two screws E attaching the Rectifier board.

CN401

of the Rectifier board. (See Fig.3)

Fig.3

and CN406 of the Rectifi-

Fig.1

(2) Remove the two screws D attaching the both side of the

Rear cover. (See Fig.2)

Fig.2

1-6 (No.MB748<Rev.002>)

CN406

CN407

Fig.4

3.1.3 Removing the Tuner pack (See Fig.5)

(1) Disconnect the card wire from Tuner pack connected to

connector CN102

(2) Disconnect the connector wire from Tuner pack connected

to connector CN703

(3) Remove the one screw F attaching the Tuner pack.

of the Main board.

(2) Disconnect the connector wire from CD door switch con-

nected to connector CN702

(3) Disconnect the card wire from CD mechanism connected

to connector CN903 of the Main board. (See Fig.7)

(4) Disconnect the card wire from Control board connected to

connector CN701

(5) Disconnect the connector wire from Control board connect-

ed to connector CN705

(6) Disconnect the connector wire form Cassette mechanism

connected to connector CN301 of the Main board. (See Fig.7)

(7) Disconnect the shield wire from Cassette mechanism con-

nected to connector CN201

(8) Remove the three screws G attaching the Main board.

(See Fig.7)

of the Main board. (See Fig.7)

CN703

CN102

Fig.5

3.1.4 Removing the Main board (See Fig.6, 7)

(1) Disconnect the connector wire from Main board connected

to connector of the CD mechanism. (See Fig.6)

CONNECTOR

Fig.6

CN702 CN903

CN701 CN705

CN201

CN301

Fig.7

3.1.5 Removing the Front cabinet (See Fig.8, 9)

(1) Remove the two screws H attaching the CD tray. (See

Fig.8)

Fig.8

(2) Disengage two hooks a engaged both side of the Front

cabinet. (See Fig.9)

hook a

Fig.9

(No.MB748<Rev.002>)1-7

3.1.6 Removing the Cassette mechanism (See Fig.10)

(1) Remove the four screws J attaching the Cassette mecha-

nism.

Fig.10

3.1.7 Removing the Control board (See Fig.11)

(1) Remove the Volume knob. (2) Remove the six screws K attaching the Control board.

Fig.11

3.1.8 Removing the CD mechanism (See Fig.12)

(1) Remove the four screws L attaching the CD mechanism.

Fig.12

1-8 (No.MB748<Rev.002>)

SECTION 4

ADJUSTMENT

This service manual does not describe ADJUSTMENT.

SECTION 5

TROUBLESHOOTING

This service manual does not describe TROUBLESHOOTING.

(No.MB748<Rev.002>)1-9

Victor Company of Japan, Limited

Personal AV Operation 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan

(No.MB748<Rev.002>)

Printed in Japan

VSE

SCHEMATIC DIAGRAMS

MICRO COMPONENT SYSTEM

UX-G120E, UX-G120EY

Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)

Contents

Block diagrams Standard schematic diagrams Printed circuit boards

For Russian

2-1 2-2 2-8 to 10

No.MB748SCH<Rev.002>

2011/1

+ 25 hidden pages