JVC SPDWF-10 Service manual
SERVICE MANUAL
POWERED SUB WOOFER
MB25120046
SP-DWF10
J ---------------------------- U.S.A.
A ------------------------ Australia
E ---------- Continental Europe
US ------------------------ Singapore
UF ------------------------------ China
UP ----------------------------- Korea
UT ---------------------------- Taiwan
UX -------------------- Saudi Arabia
UJ ---------------------- U.S.Military
Area suffix
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
COPYRIGHT © 2004 Victor Company of Japan, Limited
No.MB251
2004/6
SPECIFICATION
Type Powered Subwoofer Bass-reflex type (magnetically shielded type)
Speaker 16.0 cm cone × 1 (6-5/16")
Frequency Range 32 Hz 200 Hz
Impedance 4 Ω
Input terminals INPUT (LOW-LEVEL)
Power requirements AC 120 V , 60 Hz
Output power of built-in amp 100 W (45 Hz, 4 Ω, 10 % THD)
Power Handling Capacity 25 W
Dimensions (W × H × D) 185 mm × 374 mm × 345 mm (7-5/16" × 14-3/4" × 13-5/8")
Mass 8.86 kg (19.6 lbs)
Design and specifications are subject to change without notice.
1-2 (No.MB251)
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.MB251)1-3
1.5 Importance administering point on the safety
Power switch board
F9001
Caution: For continued protection against risk of fire,
replace only with same type 3 A/125 V for F901.
This symbol specifies the type of fast operating fuse.
Precaution: Pour la protection continue contre les
risques d'incendie, remplacer uniquement par le
meme type: fusible 3 A/125 V pour les F901.
^
Ce symbole specifie le type de fusible a action rapide.
1-4 (No.MB251)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
(No.MB251)1-5
SECTION 3
A
DISASSEMBLY
3.1 Removing the Amplifier assembly
(See Figs.1 and 2)
(1) From the back side of the main body, remove the eleven
screws A attaching the amplifier assembly. (See Fig.1.)
(2) Take out the amplifier assembly from the main body.
(3) Disconnect the wire connector from the back side of the
amplifier assembly. (See Fig. 2.)
(4) Disconnect the speaker wire from the speaker terminal.
(See Fig.2.)
Amplifier assembly
3.2 Removing the back panel
(See Figs.1 to 3)
(1) From the back side of the main body, remove the eleven
screws A attaching the amplifier assembly. (See Fig.1.)
Reference:
Remove the amplifier assembly from the main body as
required. (See Fig.2.)
(2) Remove the five screws B attaching the back panel. (See
Fig.3.)
A
A
mplifier assembly
A
A
A
Fig.1
Speaker terminal
1-6 (No.MB251)
Wire connector
B
Fig.2
B
Fig.3
3.3 Removing the power cord
(See Figs.4 and 5)
• Prior to performing the following procedures, remove the back
panel.
(1) Remove the two screws C attaching the bracket a. (See
Fig.4.)
(2) Pull out the bracket a toward you.
(3) Disconnect the power cord from the connector CN901
the power switch board. (See Fig.5.)
3.4 Removing the amplifier board assembly (Amp board,
volume board, switch board)
(See Figs.5 and 6)
• Prior to performing the following procedures, remove the back
panel and the power cord.
• Remove the amplifier assembly from the main body as re-
quired. (See Figs.1 and 2.)
(1) Remove the three screws D attaching the bracket b. (See
Fig 5.)
(2) Disconnect the wire from the connectors CN102
on the amp board. (See Fig.5.)
CN503
(3) Remove the amplifier board assembly from the connectors
and CN952 on the regulator board. (See Fig.6.)
CN951
(4) Take out the amplifier board assembly.
on
and
Bracket a
CN503
CN102
Bracket b
C
Power cord
C
Fig.4
Volume board
3.5 Removing the power supply board assembly (Regulator board, power switch board)
(See Fig.6)
• Prior to performing the following procedures, remove the back
panel, power cord and amplifier board assembly.
• Remove the amplifier assembly from the main body as re-
quired. (See Figs.1 and 2.)
(1) Remove the screw E attaching the bracket c. (See Fig.6.)
(2) Remove the two screws F and four screws G attaching the
regulator board.
(3) Take out the power supply board assembly.
D
Amp board
CN951
CN901
Power switch board
Fig.5
F
D
Switch board
Regulator board
CN952
Power switch board
E
Fig.6
GG
Bracket c
(No.MB251)1-7
3.6 Removing the net assembly
(See Fig 7)
(1) From side of the main body, insert the tip of the flat-bladed
screwdriver or similar tool into the space between the main
body and net assembly, and lift the net assembly little by
little to remove. (See Fig 7)
Note:
To prevent damaging the net assembly and main body, insert
cushioning plates etc. and below the tip of the flat-bladed
screwdriver or similar tool.
From right side of the main body, release the eight joints d, and
take out the net assembly from the main body. (See Fig 7)
3.7 Removing the speaker.
(See Fig 8 and Fig 9)
• Prior to performing the following procedures, remove the net
assembly.
(1) Remove the six screws H attaching the speaker. (Fig 8)
(2) Take out the speaker from the main body.
(3) Disconnect the wires from the terminal of the speaker. (See
Fig 9)
Net assembly
Joint d (eight joints)
Flat-bladed
screwdriver,etc.
Cushioning
plate,etc.
Main body
Fig.7
H
Main body
H
Fig.8
Terminal
Speaker
Fig.9
1-8 (No.MB251)
SECTION 4
ADJUSTMENT
This service manual does not describe ADJUSTMENT.
(No.MB251)1-9
SECTION 5
TROUBLESHOOTING
This service manual does not describe TROUBLESHOOTING.
1-10 (No.MB251)
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