POWER SUBWOOFER
KS-303HT/SW-22HT/25HT
SERVICE MANUAL
REVISED
© 2001-4/B51-5710-00 (K/K) 1362
AC power cord
(E30-5857-08)
Fuse holder
(J13-0212-08)
AC power cord bushing
(J42-0243-08)
LED
(B30-1832-08)
Grille ass'y
(B06-1481-08)
RCA jack x2
(E63-0213-08)
Control rotary
(R31-0418-08)
Slide switch
(S62-0213-08)
Control rotary
(R31-0419-08)
70%
SPECIFICATIONS
Subwoofer(SW-22HT/SW-25HT)
System
Subwoofer system with built-in amplifier
Audio
Output Power
50 Watts RMS, at 4
from 40 Hz to 160 Hz with no
more than 0.09% total harmonic distortion
section
Input Sensitivity/Impedance
100 mV/43 k
, 200 mV/43 k (MONO)
RCA-type pin-plug jack (LINE IN):
Push-type terminals:
1.8V/1.2 k
Turn Over Frequency
80 Hz ~ 160 Hz
Phase Switching
NORMAL, REVERSE
Enclosure
Bass-Reflex
Speaker Loudspeaker
200 mm (8") Cone type
section
Nominal Impedance
4
Frequency Response
40 Hz ~ 250 Hz
Power Consumption
110 W
Supply Voltage
AC120 V, 60 Hz
Dimensions
Width:
286 mm (11-1/4")
General
Height:
368 mm (14-1/2")
Depth:
356 mm (14")
Net Weight
11.2 kg (24.7 Ib)
Enclosure Finish
High density particle board Iaminated with simulated
wood grain vinyl.
Front speaker, Center speaker, Rear speaker
Front speaker
Center speaker
Rear speaker
system
2 way
2 way
1 way
(Magnetically shielded)
(Magnetically shielded)
Enclosure
Acoustic Air Suspension Acoustic Air Suspension Acoustic Air Suspension
Loudspeaker
100 mm(4") Cone type
(Full Range type)
Woofer: 100 mm(4") Cone type
100 mm(4") Cone type
Tweeter:
50 mm(2") Cone type
50 mm(2") Cone type
Nominal Impedance
8
8
8
Peak Input Power
80W
80W
Maximum Input Power
80W
40W
40W
Sensitivity
88dB/Wat 1m
88dB/Wat 1m
85dB/Wat 1m
Frequency Response
100Hz ~ 20,000 Hz
100Hz ~ 20,000 Hz
100Hz ~ 20,000 Hz
Crossover Frequency
3,000 Hz
3,000 Hz
Dimensions
Width:
129mm(5-1/16")
129mm(5-1/16")
129mm(5-1/16")
Height:
198mm(7-13/16")
198mm(7-13/16")
198mm(7-13/16")
Depth:
120mm(4-3/4")
120mm(4-3/4")
120mm(4-3/4")
Net Weight
1.2kg(2.6Ib)/piece
1.0kg(2.2Ib)
0.8kg(1.8Ib)/Piece
NOTE: THE GRILLES ON ALL SPEAKERS CANNOT BE REMOVED.
Notes:
1. Kenwood follows a policy of continuous advancements in development. For this reason, specifications may be changed without notice.
2. Full performance may not be exhibited in extremely cold locations (below 0 deg. C).
Switch push
(S68-0206-08)
Speaker jack
(E70-0204-08)
Switch rocker
(S66-0204-08)
KS-303HT is bundled up satellite speaker. SW-22HT and
SW-25HT are Subwoofer only.
Pin-plug cord (1)
(E30-5839-08)
Cushions (4)
(G13-1141-08)
(KS-303HT
and SW-22HT)
Speaker wires (5)
(W01-1088-08)
(KS-303HT only)
KS-303HT/SW-22HT/25HT
2
CONTENTS / ACCESSORIES
DISASSEMBLY FOR REPAIR
SPECIFICATIONS ........................................Top cover
CONTENTS / ACCESSORIES .................................. 2
DISASSEMBLY FOR REPAIR....................................2
PC BOARD ................................................................ 3
SCHEMATIC DIAGRAM ............................................ 5
EXPLODED VIEW ......................................................9
PARTS LIST..............................................................10
Contents
Accessories
1 x3
2
2
2
2
2
2
1 x3
1 x3
1 x3
How to Remove the Amplifier
1. Remove screws fixed the rear panel to the enclosure.
2. Remove screws fixed the rear panel to the amplifier cover.
How to Remove the Grille Ass'y
1. You need to remove the grille ass'y if replace the sub-
woofer.
2. Insert the screw driver to the gaps of the grille ass'y and
lift it up.
There are 3 models' information for repair in this manual. SW-25HT is new model, however, KS-303HT and SW-
22HT are circuit change information(revised).
ACE
G
I
BD
F
H
J
2
1
3
5
7
4
6
CROSSOVER
OUTPUT
VOLUME
PHASE
INPUT
FROM AMPLIFIER
TO SPEAKERS
B
E
E
B
B E
B E
B E
B
E
B
E
B
E
B
E
B
E
B E
B
E
B
E
B
E
E
B
B
E
B
E
R604
C601
C603
R401
J130
C402
J146
J156
J143
RB601
R414
C404
R162
C151
P501
G
R412
1
R515
R514
C506
R513
B
E
JW604
R41
1
R407
J145
C602
J142
C137
C508
C141
R408
R160
J127
J126
C158
R409
R510
C504
C410
R501
J155
R51
1
J152
J151
C152
J128
L101
R403
C139
C136
R404
R153
R406
R405
R509
R151
B
E
J139
C132
R155
C156
R156
R506
J147
R507
J141
R161
J133
R159
C403
J144
C135
C150
J134
C133
R154
J132
J157
C138
R508
C502
J135
R504
C530
R503
I
G
R502
J138
P61
R152
C501
R606
JW601
R416
R608
R607
R605
RL101
J603
R601
R602
R603
P62
R610
R609
R61
1
C604
C605
J137
C408
J136
R413
R417
C405
C407
T2
C406
J153
R410
R415
R402
T1
C401
J140
R505
J150
C155
ZD401
C159
C157
J131
C131
J154
SPK GND
OI
4
8
5
O
1
6
13
12
R111
C114
R102
J1
12
ZD101
C153
C154
C1
15
C1
16
C119
C122
R137
R136
E
R105
J148
7
E
6
B
B
C103
R178
R107
R109
R134
R138
R140
AUTO POWER SW
1
2
R133
R130
8
R129
R164
R157
R139
R158
P502
R132
1
J101
C121
R131
C120
B
E
R106
R110
J149
R179
R177
C105
R108
C104
C102
R104
+
L
L
C101
J106
C117
J105
J103
R128
4
E
B
5
R135
C123
J102
R120
C118
R126
J104
R127
R165
J107
J108
J109
C142
R103
C113
J
111
J1
10
R113
C106
1
6
C149
R1
16
C1
10
C107
R1
12
R1
18
J125
J123
VR101
3
J1
14
R101
9
J118
J1
17
5
1
J122
2
R176
4
1
J129
C148
R168
C111
R125
C1
12
1
J116
R124
J113
14
J1
15
R167
R114
J121
J1
19
J120
R123
7
C108
C109
R122
R115
8
R1
19A
R1
19
J124
R181
R180
C124
R1
17
VR102
R183
L
C140
9
C147
1
C146
P102
R184
12
D602
CN601
Q502
Q603
Q605
Q604
Q602
Q601
IC105
IC501
Q109
D502
Q408
Q107
D501
D105
Q108
Q501
Q401
D102
ZD103
Q409
D103
D104
Q405
Q402
IC104
CN104
CN101
Q406
CN102
BD101
D601
Q404
Q403
Q407
D401
IC102
JK102
HIGH LEVEL INPUT
HIGH LEVEL OUTPUT
LOW
LEVEL
INPUT
LOW
LEVEL
OUTPUT
VOLUME
CROSSOVER
PHASE
CN103B
Q101
SW101
LD101
Q102
D101
Q110
D109
Q115
RIB104
CN103A
SW102
P101
JK101
IC101
JK103
Refer to the schematic diagram for the value of resistors and capacitors.
PC BOARD(Component side view)
POWER IC TYPE
POWER TRANSISTOR TYPE
3
4
A
BD
F
H
J
CE
G
I
2
1
3
5
7
4
6
14
13
12
11
10
9
8
1
2
3
4
5
6
7
4
3
2
5
7
6
1
8
6
5
4
3
2
1
6
5
4
3
2
1
1
6
14
3
2
12
13
7
8
10
9
11
4
5
R105
30K
R107
1.2K
1W
R178
1.2K
100P
C103
C105
0.01
120 1W
R177
R108
1.2K
1W
30K
R106
100P
C104
1.2K
R179
39K
R1
10
10K
R101
R103
47K
100P
C101
R102
10K
R104
47K
100P
C102
39K
R109
4.7u50
+
C106
10K
R
111
4.7u50
+
C109
4.7K
R1
19
4.7u50
C124
+
100K
R180
18K
R117
100K
R181
120K
R112
100P
C107
4.7u50
+
C108
22K
R1
15
0.047
C149
220K
2.2K
R114
R167
10K(A)
VR101
10K
R168
10K
R116
4.7u50
C1
10
+
18K
R122
18K
R124
0.068
C111
0.039
C1
12
220K
R176
10K
R125
0.068
C1
13
0.039
C142
10K
R123
51
32
4
6
987
96
87
5
3
42
1
820K
R128
10P
C119
2.2M
R127
C117
0.1
R129
10K
0.022
C154
220u10
C153
+
9
7
C120
0.022
1K
R120
R130
1M
R132
1M
1K
R183
R184
1K
50K(B)
VR102B
VR102A
50K(B)
100P
C147
100P
C146
0.1
C122
2.2K
R164
68
R131
R134
220K
R133
10M
C121
220u16
+
R139
10K
R158
22K
ON
OFF
R136
10K
3.3K
R137
2.2K
R140
2.2K
R138
6.8K
R157
R135 33
0.1u50
C1
14
+
100u16
C123
+
33
R126
100u16
C1
15
+
0.022
C1
16
15P
C507
33P
C126
15K
R143
0.068
C130
10 1/2W
R146
10 1/2W
R147
0.22
3W
R150
0.22
3W
R149
R151
4.7 1/2W
1uH
L101
0.039
C131
4.7
R152
1/2W
RL101
560 2W
R153
3.9K
R145
1000P
C129
2K
R170
5
6
7
3
4
2
8
1
2.2u50
+
C501
22K
R501
1u50
+
C502
4.7K
R505
5.6K
R504
1K
R503
1K
R502
10K
R515
10u50
C506
+
10K
R514
1M
R509
10K
R507
10K
R508
10u50
C508
+
1M
R506
120K
R513
15K
R510
47K
R51
1
0.1
C504
OUT
GND
IN
0.1
C150
100u16
C139
+
330 2W
R159
OUT
GND
C141
100u16
+
IN
C151
0.1
680 1/2W
R160
0.1
C530
0.1
C135
0.1
C136
3300u50
C138
+
3300u50
C137
+
220K
R154
1
2
47u16
+
C132
47K
R156
68K
R155
R148
15K
47u16
C503
+
300
R512
R516
3.3K
10u50
C605
+
22K
R606
100K
R605
4.7K
R604
100K
R603
R61
1
100K
10u50
C601
+
C604
10u50
+
R610
3.3K
100K
R609
100u16
C603
+
C602
100u16
+
R608
3.3K
R607
3.3K
68K
R161
10u50
C133
+
8.2K
R162
1/4W
3
1
2
1
2
3
4
T101
3A
F101
250V
AC
+35V
+24V
+35V
+35V
+35V
+35V
+35V
+35V
35V
35V
35V
26V
35V
35V
35V
35V
35V
35V
+15V
+15V
+15V
+15V
+15V
15V
15V
15V
15V
15V
15V
15V
+15V
+15V
+15V
+15V
B
+B
9
7
0.47u50
C1
18
+
22K
R1
13
27K
R1
18
0.047
C148
0.1
C152
1K
R601
27K
R602
P501
1/2W
3.3M
0.01
C1
R1
IC101
IC102
IC104
IC105
IC103
KS-303HT
RIB104
CN104
CN103B
JK102
JK101
SW102
ZD101
JK103
D101
SW101
LD101
Q101
Q102
Q110
STANDBY
LED
OP
AMP
VOLUME
CROSSOVER
R
L/MONO
LOW
INPUT
LEVEL
R
OUTPUT
LEVEL
LOW
L
D102
IC501(1/2)
(2/2)
IC501
D501
D502
+15V AVR
-15V AVR
Q105
Q106
D103
Q108
Q109
Q104
Q501
Q502
D601
Q601
Q605
Q602
Q603
Q604
ZD103
D104
Q107
BD101
CN101
SW103
POWER
AMP
FINAL
TR.
CN601
CN102
SUB WOOFER
D105
B LINE
B LINE
GND LINE
SIGNAL LINE
IC101
: TL074CN
IC102,501
: NJM4558D
IC103
: UPC1298V
IC104
: TA7815S
IC105
: TA79015S
Q101,102,108-110,501,
502,601,603-605
: 2SC945(Q,P)
Q104
: 2SD882
Q105
: 2SC5198(O)
Q107,602 : 2SA733A(P)
D101,103,105,501,502,
601,602
: 1N4148
D102,104
: 1N4001
ZD103
: MTZJ18B
ZD101
: MTZJ6.2B
HIGH
LEVEL
INPUT
HIGH
LEVEL
OUTPUT
PHASE SW
AUTO POWER SW
OP AMP
SP.
RELAY
D602
2SA1941(O)
Q106
:
BD101
: RS402L
SP1
0V
0V
0V
-14.9V
0V
0V
0V
14.7V
0V
0V
0V
0V
0V
14.7V
6.2V
5.1V
: 1.3V
POWER ON
12.9V
6.0V
POWER ON
: 0.7V
28.6V
-33.2V
0.6V
-0.6V
0V
0V
-35.0V
0.6V
-1.3V
-0.7V
0V
0V
0V
15.0V
0V
0V
0V
15.0V
23.5V
35.0V
-26.4V
-35.0V
-15.0V
POWER ON
: 3.0V
8.6V
0.7V
15.0V
15.0V
0V
14.6V
8.8V
0V
0V
14.3V
15.0V
35.0V
KS-303HT
Y29-6400-10
CAUTION: For continued safety, replace safety critical components only with manufacturer's recommended parts (refer to parts list).
indicates safety critical
components. For continued protection against risk of fire, replace only with same type and rating fuse(s). To reduce the risk of electric shock, leakage-current or
resistance measurements shall be carried out (exposed parts are acceptably insulated from the supply circuit) before the appliance is returned to the customer.
The DC voltage is an actual reading
measured with a high impedance type
voltmeter with no signal input. The
measurement value may vary depend-
ing on the measuring instruments used
or on the product.
2SA733A
2SC945
2SD882
NJM4558D
TA7815S
TA79015S
UPC1298V
14
13
12
11
10
9
8
1
2
3
4
5
6
7
4
3
2
5
7
6
1
8
6
5
4
3
2
1
6
5
4
3
2
1
R105
30K
R107
1.2K
1W
R178
1.2K
100P
C103
C105
0.01
120 1W
R177
R108
1.2K
1W
30K
R106
100P
C104
1.2K
R179
39K
R1
10
10K
R101
R103
47K
100P
C101
R102
10K
R104
47K
100P
C102
39K
R109
4.7u50
+
C106
10K
R
111
4.7u50
+
C109
4.7K
R1
19
4.7u50
C124
+
100K
R180
18K
R117
100K
R181
120K
R112
100P
C107
4.7u50
+
C108
22K
R1
15
0.047
C149
220K
2.2K
R114
R167
10K(A)
VR101
10K
R168
10K
R116
4.7u50
C1
10
+
18K
R122
18K
R124
0.068
C111
0.039
C1
12
220K
R176
10K
R125
0.068
C1
13
0.039
C142
10K
R123
51
32
4
6
987
96
87
5
3
42
1
820K
R128
10P
C119
2.2M
R127
C117
0.1
R129
10K
0.022
C154
220u10
C153
+
9
7
C120
0.022
1K
R120
R130
1M
R132
1M
1K
R183
R184
1K
50K(B)
VR102B
VR102A
50K(B)
100P
C147
100P
C146
0.1
C122
2.2K
R164
68
R131
R134
220K
R133
10M
C121
220u16
+
R139
10K
R158
22K
ON
OFF
R136
10K
3.3K
R137
2.2K
R140
2.2K
R138
6.8K
R157
R135 33
0.1u50
C1
14
+
100u16
C123
+
33
R126
100u16
C1
15
+
0.022
C1
16
0.22
5W
R416
0.22
5W
R415
R151
4.7 1/2W
1uH
L101
0.039
C131
4.7
R152
1/2W
RL101
560 2W
R153
5
6
7
3
4
2
8
1
2.2u50
+
C501
15K
R501
1u50
+
C502
4.7K
R505
36K
R504
1K
R503
1K
R502
10K
R515
10u50
C506
+
10K
R514
1M
R509
10K
R507
10K
R508
10u50
C508
+
1M
R506
120K
R513
15K
R510
47K
R51
1
0.1
C504
OUT
GND
IN
0.1
C150
100u16
C139
+
330 2W
R159
OUT
GND
C141
100u16
+
IN
C151
0.1
680 1/4W
R160
0.1
C530
0.1
C135
0.1
C136
3300u50
C138
+
3300u50
C137
+
220K
R154
1
1
2
2
47u50
+
C132
47K
R156
68K
R155
R417
12K
10u50
C605
+
22K
R606
10K
R605
4.7K
R604
100K
R603
R61
1
100K
10u50
C601
+
C604
10u50
+
R610
3.3K
100K
R609
100u16
C603
+
C602
100u16
+
R608
3.3K
R607
3.3K
68K
R161
10u50
C133
+
8.2K
R162
1/4W
3
1
2
1
2
3
4
T101
3A
F101
250V
AC
+35V
+24V
+35V
+35V
+35V
+35V
35V
35V
35V
26V
35V
35V
35V
35V
+15V
+15V
+15V
+15V
+15V
15V
15V
15V
15V
15V
15V
15V
+15V
+15V
+15V
+15V
B
+B
9
7
0.47u50
C1
18
+
22K
R1
13
27K
R1
18
0.047
C148
0.1
C152
1K
R601
27K
R602
P501
1/2W
3.3M
0.01
C1
R1
C408
33P
R414
300
1/2W
C406
R409
51
R408
51
0.1
C404
3.6K
R41
1
750
R412
820
R413
51
R407
C410
270P
0.1
6.2K
R410
R401
1K
R405
1.8K
1.8K
R406
1/2W
+
C401
100u16
12K
R402
+
C403
22u35
1.5K
R404
R403
56K
4.7u50
C402
+
0.1
C405
0.1
C407
IC101
IC102
IC104
IC105
KS-303HT(K)/SW-22HT REVISED /SW-25HT
RIB104
CN104
CN103B
CN103A
JK102
JK101
SW102
ZD101
JK103
D101
SW101
LD101
Q101
Q102
Q110
STANDBY
LED
OP
AMP
VOLUME
CROSSOVER
R
L/MONO
LOW
INPUT
LEVEL
R
OUTPUT
LEVEL
LOW
L
D102
IC501(1/2)
(2/2)
IC501
D501
D502
+15V AVR
-15V AVR
Q408
Q409
D103
Q108
Q109
Q501
Q502
D601
Q601
Q605
Q602
Q603
Q604
ZD103
D104
Q107
BD101
CN101
SW103
POWER
CN601
CN102
SUB WOOFER
D105
B LINE
B LINE
GND LINE
SIGNAL LINE
IC101
: TL074CN
IC102,501
: NJM4558D
IC104
: TA7815S
IC105
: TA79015S
Q101,102,108-110,403,404,
501,502,601,603-605
: 2SC945(Q,P)
Q408
: 2SC5198(O)
Q107,401,402,405,602
: 2SA733A(P)
D101,103,105,401,501,502,
601,602
: 1N4148
D102,104
: 1N4001
ZD103
: MTZJ18B
ZD101
: MTZJ6.2B
HI
GH
LEVEL
INPUT
HI
GH
LEVEL
OUTPUT
PHASE SW
AUTO POWER SW
OP AMP
SP.
RELAY
D602
2SA1941(O)
Q409
:
BD101
: RS402L
SP1
D401
Q405
Q404
Q403
Q407
Q406
Q402
Q401
ZD401
Q406
2SC2235Y
:
ZD401
MTZJ12B
:
Q407
2SA965Y
:
BIAS
DRIVER
0V
0V
0V
-14.9V
0V
0V
0V
14.7V
0V
0V
0V
0V
0V
14.7V
6.2V
5.1V
: 1.3V
POWER ON
12.9V
6.0V
POWER ON
: 0.7V
0V
0V
0V
15.0V
0V
0V
0V
15.0V
23.5V
35.0V
-26.4V
-35.0V
-15.0V
POWER ON
: 3.0V
8.6V
0.7V
15.0V
15.0V
0V
14.6V
8.8V
0V
0V
14.3V
15.0V
KM
O
Q
S
LN
P
R
T
2
1
3
5
7
4
6
CAUTION: For continued safety, replace safety critical components only with manufacturer's recommended parts (refer to parts list).
indicates safety critical compo-
nents. For continued protection against risk of fire, replace only with same type and rating fuse(s). To reduce the risk of electric shock, leakage-current or resistance
measurements shall be carried out (exposed parts are acceptably insulated from the supply circuit) before the appliance is returned to the customer.
The DC voltage is an actual reading
measured with a high impedance type
voltmeter with no signal input. The
measurement value may vary depend-
ing on the measuring instruments used
or on the product.
SW-22HT/25HT
Y29-6400-10
2SA965Y
2SA733A
2SC2235Y
2SC945
2SD882
NJM4558D
TA7815S
TA79015S
UPC1298V