JVC UXTB-30 Service manual

SERVICE MANUAL

COMPACT COMPONENT SYSTEM

MB725<Rev.001>20103SERVICE MANUAL

UX-TB30B, UX-TB30E, UX-TB30EN,

UX-TB30EV

XT-UXTB30

AX-UXTB30

COPYRIGHT © 2010 Victor Company of Japan, Limited

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

TABLE OF CONTENTS

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

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

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

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

SP-UXTB30SP-UXTB30

COPYRIGHT © 2010 Victor Company of Japan, Limited

No.MB725<Rev.001>

2010/3

SPECIFICATION

Amplifier unit (AX-UXTB30)

Output Power 20 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 - 8 Ω

Player/tuner unit (XT-UXTB30)

Tuner section

FM tuning range 87.50 MHz - 108.00 MHz

CD player section

Measurement Condition 2W, IEC-A weighted

Dynamic range 75 dB

Signal-to-noise ratio 75 dB

Wow and flutter Immeasurable

Terminals

AUDIO IN Input sensitivity/Impedance 250 mV/50 kΩ

USB MEMORY USB specification Compatible with USB 2.0 Full-Speed

Compatible device Mass storage class

Compatible system FAT16, FAT32

Output power DC 5 V 500 mA

General

Power requirement AC 230 V , 50 Hz

Power consumption 50 W (at operation)

1.00 W or less (on standby)

Dimensions (approx.) Player/tuner unit 230 mm × 81 mm × 230 mm (W × H × D)

Amplifier unit 230 mm × 81 mm × 243 mm (W × H × D)

Mass (approx.) Player/tuner unit 1.70 kg

Amplifier unit 2.94 kg

Speakers (SP-UXTB30)

Type 2-way Bass reflex

Speaker units Tweeter 4 cm cone × 1

Woofer 10 cm cone × 1

Dimensions (approx.) 160 mm × 250 mm × 160 mm (W × H × D)

Mass (approx.) 1.81 kg each

Designs & specifications are subject to change without notice.

1-2 (No.MB725<Rev.001>)

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.MB725<Rev.001>)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

1M

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.

1-4 (No.MB725<Rev.001>)

1.7 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.MB725<Rev.001>)1-5

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

SECTION 3

DISASSEMBLY

3.1 Amplifier unit (Used model is UX-TB30E)

3.1.1 Removing the Top cover (See Fig.1, 2)

(1) Tear off the Rubber foots. (See Fig.1)
(2) Remove the four screws A attaching the Top cover. (See

Fig.1)

Rubber foot

3.1.2 Removing the Main board (See Fig.3, 4)

(1) Disconnect the card wire from Display board connected to

connector CN303

(2) Disconnect the connector wires from Display board con-

nected to connectors CN302 and CN305 of the Main
board. (See Fig.3)

(3) Disconnect the connector wires from Power transformer

connected to connectors CN1101
board. (See Fig.3)

(4) Disconnect the connector wire from Rectifier board con-

nected to connector CN402

(5) Remove the three screws D attaching the Main board. (See

Fig.3)

of the Main board. (See Fig.3)

of the Main board. (See Fig.3)

AA

CN305

CN1101

Fig.1

(3) Remove the five screws B and two screws C attaching the

Rear cover. (See Fig.2)

CN402

and CN1104 of the Main

CN1104

D

B

1-6 (No.MB725<Rev.001>)

Fig.2

C

CN303 CN302

D

Fig.3

(6) Remove the three screws E attaching the Heat sink. (See

Fig.4)

E

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

panel. (See Fig.7)

hook

a

Fig.7

3.1.5 Removing the Display board (See Fig.8)

(1) Remove the five screws H attaching the Display board.
(2) Disconnect the connector wire from Volume board con-

nected to connector CN702

of the Display board.

Fig.4

3.1.3 Removing the Rectifier board (See Fig.5)

(1) Disconnect the connector wire from Power transformer

connected to connector CN1102

(2) Remove the four screws F attaching the Rectifier board.

of the Rectifier board.

F

CN1102

F

Fig.5

3.1.4 Removing the Front panel (See Fig.6, 7)

(1) Remove the two screws G attaching the Front panel. (See

Fig.6)

G

H

CN702

Fig.8

3.1.6 Removing the Rectifier board (See Fig.9)

(1) Remove the Volume knob.
(2) Remove the two screws J attaching the Volume board.

H

J

Fig.9

J

Fig.6

(No.MB725<Rev.001>)1-7

3.2 CD unit (Used model is UX-TB30E)

A

3.2.1 Removing the Top cover (See Fig.1, 2)

(1) Tear off the Rubber foots. (See Fig.1)
(2) Remove the four screws A attaching the Top cover. (See

Fig.1)

Rubber foot

(3) Remove the two screws D attaching the Front panel. (See

Fig.4)

D

A

Fig.1

(3) Remove the five screws B and two screws C attaching the

Rear cover. (See Fig.2)

B

C

3.2.2 Removing the Front panel (See Fig.3, 4, 5)

(1) Disconnect the connector wire from USB board connected

to connector CN603
(2) Disconnect the connector wire from Control board connect-

ed to connector CN703

B

Fig.2

of the CD board. (See Fig.3)

of the Equalizer board. (See Fig.3)

CN703

Fig.4

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

panel. (See Fig.5)

hook

a

Fig.5

CN603

1-8 (No.MB725<Rev.001>)

Fig.3

3.2.3 Removing the CD mechanism (See Fig.6, 7)

(1) Disconnect the connector wire from Equalizer board con-

nected to connector CN2701
(See Fig.6)

(2) Remove the four screws E attaching the CD mechanism.

(See Fig.6)

of the CD door switch board.

3.2.4 Removing the CD board (See Fig.8)

(1) Disconnect the card wire from Equalizer board connected

to connector CN702

(2) Disconnect the connector wire from Equalizer board con-

nected to connector CN901

(3) Remove the three screws F attaching the CD board.

CN702

of the CD board.

of the CD board.

EE

CN2701

Fig.6

(3) Turnover the CD mechanism, disconnect the card wire

from pickup connected to connector CN905
board. (See Fig.7)

(4) Disconnect the connector wire from CD mechanism con-

nected to connector CN907

of the CD board. (See Fig.7)

of the CD

CN905

F

CN901

Fig.8

3.2.5 Removing the Equalizer board (See Fig.9)

(1) Remove the three screws G attaching the Equalizer board.

G

Fig.9

3.2.6 Removing the Control board (See Fig.10)

(1) Remove the five screws H attaching the Control board.

Fig.7

CN907

H

Fig.10

3.2.7 Removing the USB board (See Fig.11)

(1) Remove the two screws J attaching the USB board.

J

Fig.11

(No.MB725<Rev.001>)1-9

SECTION 4

ADJUSTMENT

This service manual does not describe ADJUSTMENT.

SECTION 5

TROUBLESHOOTING

This service manual does not describe TROUBLESHOOTING.

1-10 (No.MB725<Rev.001>)

Victor Company of Japan, Limited

Home Entertainment Business Division Personal AV Operation 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan

(No.MB725<Rev.001>)

Printed in Japan

VSE

PARTS LIST

UX-TB30B, UX-TB30E, UX-TB30EN, UX-TB30EV

MODEL MARK

AUX-TB30B

UX-TB30E

UX-TB30EV

* All printed circuit boards and its assemblies are not available as service parts.

B

CUX-TB30EN

D

- Contents -

Exploded view of general assembly and parts list (Block No.M1)
Speaker assembly and parts list (Block No.M2)
Electrical parts list (Block No.01~10)
Packing materials and accessories parts list (Block No.M3)

MB725PAR<Rev.001>

3- 2
3- 6
3- 7
3-13

3-1

Exploded view of general assembly and parts list

9

d

64

26

64

CD unit section

27

32

58

33

25

22

CD door switch board

14

84

23

28

72

57

78

29

59

Block No.

60

M MM1

97

81

95

95

B

97

97

77

CD BOX section

4

6

15

USB board

1

30

85

62

45

31

80

44

b

61

60

b

46

c

24

a

e

f

48

CD board

c

A

98

d

90

90

EQ board

g

50

Tuner board

51

z

30

85

86

f

90

49

e

40

A

91

g

9

Control board

55

34

96

55

96

55

34

55

82

B

13

34

34

3-2