Jvc SP-DW103 Service Manual
SERVICE MANUAL
POWERED SUBWOOFER
2205620036
SP-DW103
Area suffix
B ------------------------------- U.K.
E ----------- Continental Europe
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
5 TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED
No.22056
2003/6
SPECIFICATION
Type Powered Subwoofer Bass-reflex type, (magnetically shielded type)
Speaker unit 16.0 cm cone (× 1)
Frequency range 30 Hz to 200 Hz
Input impedance 50 kΩ (LOW-LEVEL) 470 Ω (HIGH-LEVEL)
Input terminals INPUT 1 (LOW-LEVEL) INPUT 2 (HIGH-LEVEL)
Power requirements AC 230 V , 50 Hz
Output power of built-in amp 100 W (45 Hz, 4 Ω, 10 % THD)
Power consumption 27 W
Dimensions 210 mm (width) × 392 mm (height) × 348 mm (depth)
Mass 10 kg
Accessories Monaural audio cord (× 1)
1-2 (No.22056)
1.1 Safety Precautions
Good earth ground
d
AC VOLTMETER
SECTION 1
PRECAUTION
(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 0.5µ
mA AC (r.m.s.).
(Having 1000
ohms/volts,
or more sensitivity)
0.15 F AC TYPE
Place this
probe on
1500 10W
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 expose
metal part.
(No.22056)1-3
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
1-4 (No.22056)
SECTION 3
A
A
A
Amplifier assembly
Amplifier assembly Wire connector
al
B
Frequency knobVolume knob
DISASSEMBLY
3.1 Disassembly method
3.1.1 Removing the Amplifier assembly.
(See Fig1 and 2.)
(1) Remove the eleven screws A attaching the amplifier as-
sembly. (See Fig 1.)
(2) Remove 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.)
A
A
Fig.1
3.1.2 Removing the back panel.
(See Fig 3.)
(1) From the back side of the main body pull out the volume
and frequency knobs.
(2) Remove the seven screws B attaching the back panel.
Speaker termin
Fig.2
B
B
Fig.3
(No.22056)1-5
3.1.3 Removing the power cord.
B
rd
Amplifier assembly
B
rd
C
2
(See Fig 4 and 5)
• Prior to performing the following procedures. remove the back
panel.
(1) Remove the two screw C attaching the bracket. (See Fig 4)
(2) Pull out the bracket toward you.
(3) Disconnect the power cord from the connection CN901 on
the power supply assembly.
3.1.4 Removing the amplifier board assembly.
(See Fig 5 and 6)
• Prior to performing the following procedures remove the back
panel and the power cord.
(1) Remove the screw D attaching the bracket b. (See Fig 5.)
(2) Remove the three screws E attaching the bracket c. (See
Fig 5.)
(3) Disconnect the wire from the connection CN102 and
CN103 on the amplifier board assembly. (See Fig 6.)
(4) Remove the amplifier boa rd assembly from the connector
CN951 and Cn952 on the power supply board assembly.
(See Fig 6.)
(5) Pull out the amplifier board assembly toward you.
3.1.5 Removing the power supply board assembly.
(See Fig 6.)
• Prior to performing the following procedures remove the back
panel remove the power cord and amplifier board assembly.
(1) Remove the two screws F and four screws G attaching the
power supply board assembly.
(2) Pull out the power supply board assembly toward you.
racket a
CN503
CN102
racket b
E
Bracket c
C
Power co
C
Fig.4
board
E
CN901
Power supply
assembly boa
CN95
Power supply
assembly board
N951
D
Fig.5
F
GG
Fig.6
1-6 (No.22056)
3.1.6 Removing the bottomplate.
HH
JJ
(See Fig 7.)
(1) Remove the eight screws H attaching the bottom plate.
Referense:
When attaching the screw H. attach the plane and spring
washers with them.
(2) Pull out the bottom plate toward you.
H
Spring washer
Plane washer
Fig.7
3.1.7 Removing the woofer.
(See Fig 8.)
• Prior to performing the following procedures. remove the bot-
tom plate.
(1) Remove the six screws J attaching the woofer.
(2) Pull out the woofer toward you.
Fig.8
(No.22056)1-7
SECTION 4
ADJUSTMENT
This service manual does not describe ADJUSTMENT.
1-8 (No.22056)
SECTION 5
TROUBLE SHOOTING
This service manual does not describe TROUBLE SHOOTING.
(No.22056)1-9
6.1 AN79L05-T (IC592) : Regulator
2
n
(2)
• Pin Layout
3
1
• Block Diagram
Starter
SECTION 6
Description of major ICs
R
1
Voltage
Reference
Terminal
Protection
+
Error Amp.
-
Current
Limiter
R
R
2
Q
SC
1
Pass Tr.
2
1
3
Commo
(1)
Output
(3)
Input
1-10 (No.22056)
6.2 BA15218F-XE (IC101,IC102,IC103,IC104,IC501) : Dual operation amplifier
•Pin layout
OUT1 1
-IN1 2
+IN1 3
VEE 4
• Block diagram
Vcc
-IN
+IN
1
2
R1
Q5
Q1
Q2
D1
Q3 Q4
8 Vcc
7 OUT2
6 -IN2
5 +IN2
C2
R5
Q6
Q9
Q8
Q10
Q7
R7
Q11
R6
Q12
R8
Q18Q13
OTHER
CH
Q19
Q17Q16
VEE
C1
R3R2
R4
Q14 Q15Q114
R9
OUTPUT
(No.22056)1-11
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