JVC UXG-45 Service manual

SERVICE MANUAL

MICRO COMPONENT SYSTEM

MB53320066

UX-G45B,UX-G45E,

UX-G45EN,UX-G45EV

CA-UXG45 SP-UXG45SP-UXG45

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

TABLE OF CONTENTS

1 PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

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

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

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

COPYRIGHT © 2006 Victor Company of Japan, Limited

No.MB533

2006/6

SPECIFICATION

Amplifier section Output Power 80 W per channel, min. RMS, driven into 6 Ω at 1 kHz with no more

than 10% total harmonic distortion. (IEC268-3)

Speakers/Impedance 6 Ω - 16 Ω

Audio Input AUX

(Input sensitivity/Impedance)

USB Ver.1.1

Tuner section FM tuning range 87.50 MHz - 108.00 MHz

AM (MW) tuning range 522 kHz - 1 629 kHz

CD player section Dynamic range 85 dB

Signal-to-noise ratio 85 dB

Wow and flutter Immeasurable

General Power requirement AC 230 V , 50 Hz

Power consumption 145 W (at operation)

Dimensions (approx.) 175 mm × 246 mm × 415 mm (W/H/D)

Mass (approx.) 6.2 kg

Speakers Type 2-way Bass reflex

Speaker units Woofer 12 cm cone × 1

Tweeter 4 cm cone × 1
Impedance 6 Ω
Dimensions (approx.) 145 mm × 246 mm × 212 mm (W/H/D)

Mass (approx.) 2.2 kg each

LEVEL1 : 150 mV/47 kΩ
LEVEL2 : 500 mV/47 kΩ

20 W (on standby)

0.9 W (standby and on Display off)

Design and specifications are subject to change without notice.

1-2 (No.MB533)

SECTION 1

PRECAUTIONS

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.MB533)1-3

1.5 Safety Precautions (U.K only)

(1) This design of this product contains special hardware and many circuits and components specially for safety purposes. For con-

tinued 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.

(2) Any unauthorised design alterations or additions will void the manufacturer's guarantee; furthermore the manufacturer cannot

accept responsibility for personal injury or property damage resulting therefrom.

(3) Essential safety critical components are identified by ( ) on the Parts List and by shading on the schematics, and must never

be replaced by parts other than those listed in the manual. Please note however that many electrical and mechanical parts in
the product have special safety related characteristics. These characteristics are often not evident from visual inspection. Parts
other than specified by the manufacturer may not have the same safety characteristics as the recommended replacement parts
shown in the Parts List of the Service Manual and 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.

1.5.1 Warning

(1) Service should be performed by qualified personnel only.
(2) This equipment has been designed and manufactured to meet international safety standards.
(3) It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
(4) Repairs must be made in accordance with the relevant safety standards.
(5) It is essential that safety critical components are replaced by approved parts.
(6) 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.

1-4 (No.MB533)

1.6 Important for laser products

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

(No.MB533)1-5

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-6 (No.MB533)

SECTION 3

DISASSEMBLY

3.1 Main Body

3.1.1 Removing the side panel
(See Fig.1, 2)

(1) Remove the four screws A attaching the rear cover. (See

Fig.1)

(2) Remove the six screws B attaching the side panel . (See

Fig.1)

(3) Remove the four screws C attaching the side panel. (See

Fig.2)

AAE

BB

A

Fig.1

CC

Fig.2

(No.MB533)1-7

3.1.2 Removing the top cover
(See Fig.1, 3)

(1) Remove the four screws D attaching the top cover and the

side panel. (See Fig.3)

(2) Remove the one screw E attaching the top cover. (See

Fig.1)

Caution:

When take out the top cover, raise slowly, take care not to
break the two claws of the front panel.

3.1.3 Removing the power trans board
(See Fig.4)

(1) Remove the two screws F attaching the power trans board.
(2) Disconnect the connector wire from the connector CN103

of the main board.

(3) Disconnect the connector wires from the connectors

, CN902 of the trans board.

CN901

CN902

D

D

Fig.3

CN901

bb

CN103

1-8 (No.MB533)

F

Connector wire a

Fig.4

3.1.4 Removing the tuner pack

(See Fig.5, 6)

(1) Remove the two screws G attaching the tuner pack. (See

Fig.5)

(2) Disconnect the card wire from the connector CN351

main board. (See Fig.6)

of the

3.1.5 Removing the fan

(See Fig.5, 6)

(1) Remove the four screws H attaching the fan. (See Fig.5)
(2) Disconnect the connector wire from the connector CN141

of the main board. (See Fig.6)

3.1.6 Removing the main board

(See Fig.5, 7)

(1) Remove the two screws J attaching the main board. (See

Fig.5)

(2) Remove the tow screws K attaching the main board and

the front board. (See Fig.7)

(3) Disconnect the card wires from the connectors CN401

of the main board. (See Fig.7)

CN402

(4) Disconnect the card wire from the connector CN403

main board. (See Fig.7)

(5) Disconnect the parallel wire from the connector CN502

the main board. (See Fig.7)

(6) Disconnect the connector wires from the connectors

, CN102, CN204, CN361 of the main board. (See

CN101

Fig.7)

(7) Remove the five screws L attaching the main board. (See

Fig.7)

(8) (8) Remove the two screws M attaching the main board

and CD mechanism cover. (See Fig.7)

of the

of

CN141

,

Fig.6

CN351

K

G

J

J

H

Fig.5

H

H

S

CN402

CN401

CN361

L

CN502

Fig.7

CN403

M

L

CN102

CN101

CN204

L

(No.MB533)1-9

3.1.7 Removing the front panel assembly
(See Fig.3, 4, 8, 9)

(1) Pull out the tow connector wires a on the bottom chassis.

(See Fig.4)

(2) Remove the two screws N attaching the front panel. (See

Fig.8)

(3) Disconnect the connector wire from the connector CN860

of the CD board. (See Fig.9)

(4) Disengage the four hooks b are remove the front panel as-

sembly. (See Fig.3)

N

Fig.8

CN860

BN702

R

R

BN703

CN701

R

1-10 (No.MB533)

Fig.9

3.1.8 Removing the CD mechanism assembly

(See Fig.10 to 12)

(1) Remove the four screws P attaching the CD mechanism

cover and then remove it. (See Fig.10)
(2) Turn the gear c and then undraw the CD tray. (See Fig.11)
(3) Remove the four screws Q attaching the CD mechanism

assembly. (See Fig.12)

P

Fig.10

c

Fig.11

QQ

Fig.12

(No.MB533)1-11

3.1.9 Removing the CD board
(See Fig.9)

(1) Remove the three screws R attaching the CD Board.
(2) Disconnect the connector wires connected to the CD

mechanism assembly from the connectors BN702, B703 of
the CD board.

(3) Disconnect the card wire from the connector CN701

CD board.

3.1.10 Removing the rear panel
(See Fig.5, 13)

(1) Remove the one screw S attaching the rear panel. (See

Fig.5)

(2) Disengage the two hooks d and remove the rear panel.

(See Fig.13)

of the

3.1.11 Removing the power transformer
(See Fig.14)

(1) Remove the four screws T attaching the power transform-

er.

d

Fig.13

T

T

1-12 (No.MB533)

Fig.14

3.1.12 Removing the VFD board

(See Fig.15, 16)

(1) Take out the volume knob. (See Fig.15)
(2) Remove the four screws U attaching the VFD board. (See

Fig.16)

3.1.13 Removing the key board

(See Fig.16)

(1) Remove the fourteen screws V attaching the key board.

3.1.14 Removing the jack board

(See Fig.16)

(1) Remove the four screws W attaching the jack board.

Volume knob

Fig.15

VV

UU

V

V

V

Fig.16

W

(No.MB533)1-13