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SP-PW100




SERVICE MANUAL
POWERED SUBWOOFER


SP-PW100
Area suffix

UP ---------------- Korea




STAN SP-PW
D BY 100
/ON POWE
RED
SU BWOO
FER




Contents
Safety precautions 1- 2
Disassembly method 1- 3
Description of major ICs 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. 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 manufacturer`s 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 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. AC VOLTMETER
Measure the AC voltage across the resistor with the AC (Having 1000
voltmeter. ohms/volts,
or more sensitivity)
Move the resistor connection to each exposed metal part,
particularly any exposed metal part having a return path to
0.15 F AC TYPE
the chassis, and meausre the AC voltage across the resistor.
Now, reverse the plug in the AC outlet and repeat each Place this
probe on
measurement. Voltage measured any must not exceed 0.75 V each exposed
AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.). 1500 10W metal part.

Good earth ground


!
1. This equipment has been designed and manufactured to meet international safety standards. Burrs formed during molding may
2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained. be left over on some parts of the
3. Repairs must be made in accordance with the relevant safety standards. chassis. Therefore, pay attention to
4. It is essential that safety critical components are replaced by approved parts. such burrs in the case of
5. If mains voltage selector is provided, check setting for local voltage. preforming repair of this system.

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
SP-PW100


Disassembly method

Removing the front net (See Fig.1, 2) Front net
Remove the front net from the four holders that are
fixing the front net.

Note: When it is hard to remove the front net, insert a
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 Fig.1
purpose, insert the minus driver together with Main body
cloth and the like.




Front net



Fig.2



Removing the woofer (See Fig.3, 4) A
Remove the front net.

1. Remove the six screws A attaching the woofer.

2. Pull out the woofer toward you.

3. Remove the speaker cord.
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.

Note: Exercise care not to damage the main body and Front panel
the front net when inserting the minus driver.
For this purpose, insert the minus driver
together with cloth and the like.



Fig.5

Removing the LED board (See Fig.6) Bottom of main body Connector
LED board
Remove the front panel.

1. Remove the two screws B attaching the LED board.
B



Front panel

Fig.6

C
Removing the amplifier box
(See Fig.7, 8)
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 Fig.7



Amplifier box




Speaker cord connector
Fig.8

1-4
SP-PW100

Volume knob Crossover frequency knob

Removing the rear panel (See Fig.9)
Amplifier box
1. Pull out the volume knob and the crossover D
frequency knob.

2. Remove the three screws D attaching the input jack D'
and speaker terminal.

3. Remove the two screws D' attaching the voltage
selector, and then remove the rear panel.
Rear panel

Fig.9
Removing the power switch board
(See Fig.10)
Remove the rear panel.
Voltage selector
1. Pull out the power switch knob.
CN899
2. Remove the three screws E and the two screws F
attaching the bracket a. Power switch board


3. Pull out the power cord clamp from the bracket a.
F
Power switch knob
4. Pull out the power switch board backward.

5. Remove the connector CN899.
E Bracket a

Note: Cut the tie-band, if necessary. Fig.10


Bracket b
Removing the terminal board
(See Fig.11, 12) G
Remove the rear panel. Nut
Phase knob H
1. Pull out the phase knob.

2. Remove the two nuts attaching the volume knob. Terminal board

3. Remove the two screws G and the two screws H
attaching the bracket b.

4. After removing the connector CN811, pull out the
terminal board.
Fig.11
5. Remove the connector CN851.
CN811 Terminal board CN851




Fig.12
1-5
SP-PW100

Removing the amplifier board
(See Fig.13)
I
Prior to performing the following procedure, remove
the rear panel, the terminal board.

1. Remove the connectors CN881 and CN891 Amplifier board

2. Remove the six screws I attaching the amplifier
board.


I


CN881 CN891
Fig.13


Removing the transformer (See Fig.14)
Prior to performing the following procedure, remove
the rear panel, the power supply board, the amplifier J
board.

1. Remove the four screws J attaching the transformer.




Transformer
Fig.14




1-6
1

R31
TR31
17
D6
R4 3
TR1 TR2 R14 TR14 TR13
TR9 TR21 Comparator
TR11 TR23 D7
TR6 R16 5
D35
Description of major ICs




C2 D31 D33
R2 C1 R9 R19 C3 R12 4
18 TR20 TR16 TR15
STK411-290E(IC821) : Front power amp.




TR3 TR4 R5 R15 2
TR12 TR24
TR8 D32 SUB
19
R6 R16 7
20 TR10 TR22 D34
TR7 TR19
R7 R17
TR5 C5 C6
TR17 D36
D1 6
R3 R8 R18
Comparator
TR32
R13

R32
R51 8




12 13 16 10 14 15 11 21 22 9
SP-PW100




1-7
SP-PW100

NJM4580D(IC811, IC812, IC813) : Dual ope. amp.
1. Pin layout


A OUT 1 8 V+


A -IN 2 7 B OUT
A B
A +IN 3 6 B -IN


V- 4 5 B +IN



(TOP VIEW)




2. Block diagram
+
V




INPUT
+
OUTPUT




V-




TC74HCU04AP(IC851) : 2Ch NOR gate

1. Pin layout & block diagram 2. True table


1A 1 14 VCC A Y
1Y 2 13 6A L H
2A 3 12 6Y H L
2Y 4 11 5A
3A 5 10 5Y
3Y 6 9 4A
GND 7 8 4Y




1-8
4




1
2
3
5




A
VOLUME




FW801
Block diagram




FW801 SPEAKER
PHASE SW RY881
NORMAL-- REVERSE
IN POWER AMP OUT
CN881


CN881




IN PUT L / H AMP
& H.P FILTER
L.P FILTER IC 821

B+




B
Q8801
INPUT IC 811 IC 812
(LOW-LEVEL)
L / MONO


Q8201
Q8202
MUTE Q8203

IN PUT L / H AMP PROTECT

DC-DET




CN811
CN821
INPUT IC 813
(HIGH-LEVEL) 9V
B+
RGE.
MUTE
OUTPUT POWER-SUPPLY
(SPEAKER-OUT)
CIRCUIT Q8701
Q8702
PROTECT
REGULATOR
DC-DET




C
DC-DETCTOR
IC 851

LED CONT.
IC 813
CN891


CN851

POWER
CN861 POWER MAINS
TRANS PLUG




RED GREEN

INDICATOR




2-1
SP-PW100
SP-PW100

Standard schematic diagram
VR811
10KB IC821
STK411-290E




0.0033
C8110
C8111
10/50
R8117
3.9K
5
C8201




100P/50
C8232
100P/50




R8201
FW801




10
D8201 D8202
R8223

56K R8224




220P/50
R8203
MTZJ8.2C-T2 MTZJ8.2C-T2 100 56K
C8213 C8219




R8225


R8226


R8227
33K




56K
560
S8101 C8218 C8217 1/50
10/50 10/50 8.2P/50




C8207
QSW0834-001 R8202




R8228
100




270




150P/50
C8204 C8252
10/50 0.1




R8206
C8202
100/50




56K




C8214
QNN0090-001




1K



C8215
R8252




0.1
100/25
R8204




R8205
10




2.7K




2.7K




C8231