SERVICE MANUAL
POWERED SUBWOOFER
SP-PW100
Area suffix
SP-PW100
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Contents
Safety precautions
Disassembly method
Description of major ICs
UP ---------------- Korea
R
1- 2
1- 3
1- 7~8
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
No.21106
May. 2002
SP-PW100
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. Alter ations 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 manufacturer`s warr anty 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 re-assembling.
5. Leakage currnet check (Electrical shock hazard testing)
After re-assembling 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, 1,000 ohms per volt or more
sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F 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 meausre the AC voltage across the resistor.
0.15 F AC TYPE
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
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.).
Good earth ground
1500 10W
!
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 m ust 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.
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.
Place this
probe on
each exposed
metal part.
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.
(This regulation does not correspond to J and C version.)
1-2
Disassembly method
<Main body>
SP-PW100
Removing the front net (See Fig.1, 2)
Remove the front net from the four holders that are
fixing the front net.
When it is hard to remove the front net, insert a
Note:
minus driver, etc. in the place between the
main body and the front net as shown in Fig.2
before removing the front net. Exercise care
not to damage the main body and the front net
when inserting the minus driver. For this
purpose, insert the minus driver together with
cloth and the like.
Front net
Fig.1
Main body
Front net
Fig.2
Removing the woofer (See Fig.3, 4)
Remove the front net.
Remove the six screws A attaching the woofer.
1.
Pull out the woofer toward you.
2.
Remove the speaker cord.
3.
A
A
Woofer
Fig.3
Woofer
Speaker cord (Red, Black)
Fig.4
1-3
SP-PW100
Removing the front panel (See Fig.5)
1.
Place the bottom of the front panel upward.
2.
While inserting a minus driver, etc. in the two
grooves, remove the four holders that are fixing the
front panel.
Exercise care not to damage the main body and
Note:
the front net when inserting the minus driver.
For this purpose, insert the minus driver
together with cloth and the like.
Removing the LED board (See Fig.6)
Remove the front panel.
1.
Remove the two screws B attaching the LED board.
Removing the amplifier box
(See Fig.7, 8)
Front panel
Fig.5
Bottom of main body Connector
LED board
Front panel
Fig.6
C
B
1.
Remove the eleven screws C attaching the amplifier
box on the back side of the main body
2.
Remove the speaker cord connector connecting the
amplifier box and the speaker.
C
Amplifier box
Fig.7
Speaker cord connector
1-4
Fig.8
SP-PW100
<Amplifier box>
Removing the rear panel (See Fig.9)
1.
Pull out the volume knob and the crossover
frequency knob.
2.
Remove the three screws D attaching the input jack
and speaker terminal.
3.
Remove the two screws D' attaching the voltage
selector, and then remove the rear panel.
Removing the power switch board
(See Fig.10)
Remove the rear panel.
1.
Pull out the power switch knob.
2.
Remove the three screws E and the two screws F
attaching the bracket a.
3.
Pull out the power cord clamp from the bracket a.
4.
Pull out the power switch
board
backward.
Volume knob
Amplifier box
D'
Rear panel
Voltage selector
Power switch board
F
Power switch knob
Crossover frequency knob
D
Fig.9
CN899
5.
Remove the connector CN899.
Note:
Cut the tie-band, if necessary.
Removing the terminal board
(See Fig.11, 12)
Remove the rear panel.
1.
Pull out the phase knob.
2.
Remove the two nuts attaching the volume knob.
3.
Remove the two screws G and the two screws H
attaching the bracket b.
4.
After removing the connector CN811, pull out the
board
terminal
5.
Remove the connector CN851.
.
Nut
Phase knob
CN811
E
Fig.10
Bracket b
Fig.11
Terminal board
Bracket a
G
H
Terminal board
CN851
Fig.12
1-5
SP-PW100
Removing the amplifier board
(See Fig.13)
Prior to performing the following procedure, remove
the rear panel, the terminal board.
1.
Remove the connectors CN881 and CN891
2.
Remove the six screws I attaching the amplifier
board.
Removing the transformer (See Fig.14)
Prior to performing the following procedure, remove
the rear panel, the power supply board, the amplifier
board.
CN881
Fig.13
I
Amplifier board
I
CN891
J
1.
Remove the four screws J attaching the transformer. J
Transformer
Fig.14
1-6
Description of major ICs
STK411-290E(IC821) : Front power amp.
3
1
5
SP-PW100
4
2
7
SUB
6
8
R31
TR31
Comparator
TR14 TR13
R14
TR21
D7
D35
R16
D33
D31
R12
C3
R19
TR15
TR16
TR20
R15
D32
R16
D34
R17
TR19
TR17
C6
D36
R18
Comparator
R32
TR32
916
22
21
R13
17
D6
R4
TR9
TR1 TR2
TR11 TR23
TR6
C2
C1
R2
R9
18
TR24
R5
TR4
TR3
TR12
TR8
19
R6
TR22
TR10
20
TR7
R7
C5
TR5
11
15
14
10
R8
R51
12 13
D1
R3
1-7
SP-PW100
NJM4580D(IC811, IC812, IC813) : Dual ope. amp.
1. Pin layout
2. Block diagram
+
V
INPUT
+
A OUT
A -IN
A +IN
V
1
2
A
3
-
4
(TOP VIEW)
B
8
7
6
5
+
V
B OUT
B -IN
B +IN
-
V
TC74HCU04AP(IC851) : 2Ch NOR gate
1. Pin layout & block diagram
1
1A
1Y
2A
2Y
3A
3Y
GND
2
3
4
5
6
7
14
13
12
11
10
9
8
VCC
6A
6Y
5A
5Y
4A
4Y
2. True table
A
L
H
OUTPUT
Y
H
L
1-8
< MEMO >
SP-PW100
SP-PW100
VICTOR COMPANY OF JAPAN, LIMITED
AUDIO & COMMUNICATION BUSINESS DIVISION
PERSONAL & MOBILE NETWORK BUSINESS UNIT. 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan
(No.21106)
200205
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