JVC SX-A305 Service Manual

MB091200310

SERVICE MANUAL

SATTELITE SPEAKER SYSTEM

SX-A305

SX-A305F

SX-A305F

SX-A305C

SX-A305F

Area Suffix

E ------- Continental Europe

SX-A305F

TABLE OF CONTENTS

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

2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED

No.MB091

2003/11

SPECIFICATION

SX-A305F

Type 2-Way Bass-reflex type

Magnetically Shielded Type

Speaker 12.0 cm cone × 1

2.0 cm dome × 1
Power Handling Capacity 100W
Impedance 8 Ω
Frequency Range 60 Hz ~ 50 000 Hz
Sound Pressure Level 85.5 dB/W
Dimensions (W × H × D) 153 mm × 251 mm × 189.5 mm
Mass 3.2 kg each

Type 2-Way 3-Speakers

Bass-reflex type

Speaker 10.0 cm cone × 2

2.0 cm dome × 1
Power Handling Capacity 100W
Impedance 8 Ω
Frequency Range 60 Hz ~ 50 000 Hz
Sound Pressure Level 86.5 dB/W
Dimensions (W × H × D) 350 mm × 144.5 mm × 189.5 mm
Mass 3.8 kg

·m

SX-A305C

·m

1-2 (No.MB091)

SECTION 1

PRECAUTION

1.1 Safety Precautions

(1) This design of th is product contains special hardw are 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 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 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 resp onsibility 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 compone nts 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.MB091)1-3

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-4 (No.MB091)

3.1 Front speaker

A

A

3.1.1 Removing the front cover
(See Fig.1)

(1) Release the four joints a and remove the front cover.

SECTION 3

DISASSEMBLY

Front cover

3.1.2 Removing the A speaker
(See Fig.2 ~ 4)

(1) Remove the four screws A on the front panel.
(2) Remove the two screws B on the front panel.
(3) Disconnect the yellow wire and black wire from terminals

on the B speaker respectively.

(4) Remove the four screws C attaching the A speaker on the

front panel.

Front panel

speaker

A

A

Joint a

Joint a

A

A

speaker
terminal

Joint a

Joint a

Fig.1

speaker

B

B

speaker

Fig.2

B

A

A

Fig.3

speaker

CC

Front panel

Fig.4

(No.MB091)1-5

3.1.3 Removing the B speaker
(See Fig.5 , 6)

• Prior to performing the following procedure, remove the front

cover and the front panel.
(1) Remove the four screws D attaching the B speaker.
(2) Disconnect the red wire and black wire from the terminal on

the B speaker.

B

DD

speaker

Fig.5

B

speaker

Fig.6

B

speaker
terminal

1-6 (No.MB091)

3.1.4 Removing the D section

(See Fig.7 ~ 9)

(1) Remove the four screws E attaching the D cover.
(2) If necessary, unsolder the two terminals and bonding.

EE

D section

Fig.7

Bonding

Bonding

D section

Bonding

Solding

Fig.8

Solding

Bonding

terminal

Fig.9

(No.MB091)1-7

3.2 Center speaker

3.2.1 Removing the front cover
(See Fig.10)

(1) Release the four joints b and remove the front cover.

Joint b

Front cover

Joint b

3.2.2 Removing the A speaker
(See Fig.11 ~ 13)

(1) Remove the four screws F on the front panel.
(2) Remove the four screws G on the front panel.
(3) Disconnect the yellow wire and black wire fro m terminals

on the A speaker respectively.

(4) Remove the four screws H attach ing the A sp eaker on the

front panel.

Joint b

Fig.10

speaker

A

FGG

Front panel

Joint b

F

FGGF

speaker

B

Front panel

Fig.11

B

speaker

1-8 (No.MB091)

A

speaker

A

speaker
terminal

Fig.12

H

H

Fig.13

A

speaker

3.2.3 Removing the B speaker

(See Fig.14 , 15)

• Prior to performing the following procedure, remove the front

cover and the front panel.
(1) Remove the eight screws J attaching the B speaker.
(2) Disconnect the black wire from the two terminals on the B

speaker.

(3) Disconnect the red wire and black wire from the terminal on

the B speaker.

JJ

speaker

B

JJ

Fig.14

speaker

B

B

speaker
terminal

Black

Red

Fig.15

Black

B

Black

speaker
terminal

(No.MB091)1-9

3.2.4 Removing the D section
(See Fig.16 ~ 18)

(1) Remove the four screws K attaching the D cover.
(2) If necessary, unsolder the two terminals and bonding.

K

D section

K

Fig.16

Bonding

D section

C section

Solding

Fig.17

Bonding

Solding

Fig.18

1-10 (No.MB091)

SECTION 4

ADJUSTMENT

This service manual does not describe ADJUSTMENT.

SECTION 5

TROUBLESHOOTING

This service manual does not describe TROUBLESHOOTING.

(No.MB091)1-11

VICTOR COMPANY OF JAPAN, LIMITED

AV & MULTIMEDIA COMPANY AUDIO/VIDEO SYSTEMS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan

(No.MB091)

Printed in Japan

WPC