SPECIFICATIONS
POWERED SUBWOOFER
103SW/SW-301
1050SW/SW-501
SERVICE MANUAL
©1997-10/B51-5376-00 (K/K) 2295
Knob
(K29-0577-08)
KENWOOD badge
(B43-0302-04)
Knob
(K29-0573-08)
RCA pin jack
(E23-0224-08)
Speaker terminal
(E21-0279-08)
Panel *
(A29-)
Cloth frame assy
(B06-1144-08)
Note : Refer to SW-900 service manual(B51-4228-00) if you need
the microprocessor information.
Power cord bushing
(J42-0234-08)
AC power cord*
(E30-)
Window
(B10-3302-08)
Knob
(K29-0578-08)
Knob
(K29-0576-08)
1050SW(SW-501)
103SW(SW-301)
Amplifier
Power output
150 watts RMS into 4 ohms,
100 watts RMS into 4 ohms,
from 20 Hz to 200 Hz, with no
from 20 Hz to 200 Hz,with no
more than 0.09%total
more than 0.09%total
harmonic distortion
harmonic distortion
Phase switching
Normal, Reverse
Normal, Reverse
Input sensitivity and input impedance
RCA-type jack
70 mV (12 k-ohms)
70 mV (12 k-ohms)
Push-type terminals
1.7 V(15 k-ohms)
1.7 V(15 k-ohms)
Supply voltage
AC 110 V~120 V (1050SW)
AC 110 V~120 V(103SW)
Rated power consumption
150 watts
110 watts
Speaker
Enclosure
Ported
Ported
Speaker units
12 in (300 mm) polypropylene
10 in (250 mm) polypropylene
cone
cone
Nominal impedance
4 ohms
4 ohms
Width
14.3 in (363 mm)
11.8 in (300 mm)
Height
21.7 in (550 mm)
18.9 in (480 mm)
Depth
18.9 in (480 mm) with grille
15.6 in (395 mm)
Net weight
53 lb (24 kg)
40 lb (18 kg)
Since Kenwood follows a policy of continuous advancement in development, these specifications may change without notice.
Slide switch
(S62-0207-08)
* Refer to parts list on page 8.
103SW/SW301(K) COVER( 98.4.24 20:44 y[W 2
103SW/SW-301/1050SW/SW-501
CONTENTS/DISASSEMBLY FOR REPAIR/ADJUSTMENT
DISASSEMBLY FOR REPAIR
ADJUSTMENT
2
SPECIFICATIONS ........................................Top cover
CONTENTS ............................................................... 2
DISASSEMBLY FOR REPAIR....................................2
ADJUSTMENT ............................................................2
PC BOARD ................................................................ 3
SCHEMATIC DIAGRAM ............................................ 5
EXPLODED VIEW ......................................................7
PARTS LIST................................................................8
Contents
1
1
2
3
x3
Dc voltmeter
5 mV
R611
(a)
No.
ITEM
INPUT
SETTINGS
OUTPUT
SETTINGS
AMPLIFIER
SETTINGS
ALIGNMENT
POINTS
ALIGN FOR
FIG.
Unless otherwise specified, the individual switches should be set as following :
POWER : ON
NO SIGNAL INPUT
1
IDLE CURRENT
Connect a DC
voltmeter to
R611
VOLUME : 0
VR601
5 mV
(a)
< How to remove the front panel >
1. Remove the decoration plate (1) by a pincette to the bottom of
the front panel, then remove the 3 screws (2).
2. 103SW/SW-301: Remove the front panel in the upper slanting
direction of the arrow (3).
1050SW/SW-501 : Remove the front panel just the frontwards.
103SW/SW301(K) COVER( 98.4.24 20:44 y[W 3
ACE
G
I
BD
F
H
J
2
1
3
5
7
4
6
Refer to the schematic diagram for the value of resistors and capacitors.
PC BOARD(Component side view)
3
4
103SW(K) PCB/SD 98.4.24 20:40 y[W 1
R614
R631
R663
R801,2
R851
R871
R872
SW902A
D801
Q602
Q603
82K/120K
18K/22K
820/1.5K
4.7/4.7
220/-
4.7/-
4.7/-
X/X
D3SBA20/D5SBA20
2SC5198/2SC3281 (R)
2SA1941 (R) /2SA1302 (R)
82K/120K
18K/22K
820/1.5K
4.7/4.7
220/-
4.7/-
4.7/-
X/X
D3SBA20/D5SBA20
2SC5198/2SC3281 (R)
2SA1941 (R) /2SA1302 (R)
82K/120K
18K/22K
820/1.5K
4.7/4.7
220/-
220/-
10/-
X/X
D3SBA20/D5SBA20
2SC5198/2SC3281 (R)
2SA1941 (R) /2SA1302 (R)
82K/120K
18K/22K
820/1.5K
4.7/4.7
220/-
220/-
10/-
X/X
D3SBA20/D5SBA20
2SC5198/2SC3281 (R)
2SA1941 (R) /2SA1302 (R)
82K/120K
18K/22K
820/1.5K
4.7/4.7
220/-
220/-
10/-
X/X
D3SBA20/D5SBA20
2SC5198/2SC3281 (R)
2SA1941 (R) /2SA1302 (R)
82K/120K
15K/18K
560/-
-/-
180/-
4.7/-
4.7/-
X/X
D3SBA20/D5SBA20
2SC5198/2SC3281 (R)
2SA1941 (R) /2SA1302 (R)
56K/-
15K/-
560/-
-/-
180/-
4.7/-
4.7/-
X/-
D3SBA20/-
2SC5198/-
2SA1941 (R) /-
56K/75K
15K/18K
560/-
-/-
180/-
4.7/-
4.7/-
O/O
D3SBA20/D5SBA20
2SC5198/2SC3281 (R)
2SA1941 (R) /2SA1302 (R)
56K75K
15K/18K
560/-
-/-
180/-
4.7/-
4.7/-
O/O
D3SBA20/D5SBA20
2SC5198/2SC3281 (R)
2SA1941 (R) /2SA1302 (R)
82K/-
18K/-
820/-
4.7-
220/-
220-
10/-
O/-
D3SBA20/-
2SC5198/-
2SA1941 (R) /-
56K/75K
15K/18K
270/270
-/-
180/180
4.7/4.7
4.7/4.7
X/X
D3SBA20/D5SBA20
2SC5198/2SC3281 (R)
2SA1941 (R) /2SA1302 (R)
DESTINATION
C204
C207
C631
F901
F902,3
F904
R206
R603
R606
R613
COUNTRY
ABB
USA
K
0.047UF/0.056UF
0.047UF/0.039UF
100U10/220U16
3.15A/4A
0.8A/0.8A
-/-
12K/27K
1K/820
-/1K
220K/270K
CANADA
P
0.047UF/0.056UF
0.047UF/0.039UF
100U10/220U16
3.15A/4A
0.8A/0.8A
-/-
12K/27K
1K/820
-/1K
220K/270K
EUROPE
E
0.047UF/0.056UF
0.047UF/0.039UF
100U10/220U16
1.6A/2A
0.8A/0.8A
-/-
12K/27K
1K/820
-/1K
220K/270K
ENGLAND
T
0.047UF/0.056UF
0.047UF/0.039UF
100U10/220U16
1.6A/2A
0.8A/0.8A
-/-
12K/27K
1K/820
-/1K
220K/270K
GERMANY
G
0.047UF/0.056UF
0.047UF/0.039UF
100U10/220U16
1.6A/2A
0.8A/0.8A
-/-
12K/27K
1K/820
-/1K
220K/270K
AUSTRALIA
X
0.047UF/0.056UF
0.047UF/0.039UF
100U10/220U16
1.6A/2A
0.4A/0.4A
-/-
12K/27K
1K/820
-/1K
180K/180K
CHINA
C
0.047UF/-
0.047UF/-
100U10/-
1.6A/-
0.4A/-
-/-
12K/-
1K/-
-/-
180K/-
GENERAL MARKET
M
0.047UF/0.056UF
0.047UF/0.039UF
100U10/220U16
1.6A/2A
0.4A/0.4A
1.6A/2A
12K/27K
1K/820
-/1K
180K/180K
MALAYSIA
I
0.047UF/0.056UF
0.047UF/0.039UF
100U10/220U16
1.6A/2A
0.4A/0.4A
1.6A/2A
12K/27K
1K/820
-/1K
180K/180K
PX
Y
0.047UF/-
0.047UF/-
100U10/-
1.6A/-
0.8A/-
1.6A/-
12K/-
1K/-
-/-
220K/-
JAPAN
J
0.047UF/0.056UF
0.047UF/0.039UF
100U10/220U16
3.15A/4A
0.4A/0.4A
-/-
12K/27K
1K/820
-/1K
15K/18K
A
B
D
F
H
J
C
E
G
I
2
1
3
5
7
4
6
Y19-3900-10
103SW/SW-301/1050SW/SW-501
0.6V
-7.8V
5.1V
0.7V
DOWN
6.7V
DOWN
8.0V
15.3V
15.3V
0V
0V
6.6V
UP
7.1V
6.6V
UP
0V
4.9V
5.0V
5.0V
5.0V
5.0V
5.0V
0.2V
4.4V
1.4V
5.0V
0V
5.0V
5.0V
5.0V
5.0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
5.0V
5.0V
2.3V
2.4V
5.0V
5.6V
15.3V
21.3V
15.2V
15.8V
-16.1V
-24.9V
-15.5V
5.2V
5.2V
MUS:5.2V
MOV:0V
REV:0V
NOR:5.2V
-15.5V
15.2V
-5.1V
5.2V
-15.5V
15.2V
-15.5V
-15.5V
15.2V
3.5V
2.2V
0V
-0.4V
0V
-6.3V
+2.1V
-0.4V
0V
0V
0V
-0.3V
-1.3V
-0.7V
0.5V
0V
-0.5V
0.5V
0.3V
0V
5.1V
0.4V
0.7V
4.9V
-7.8V
0V
4.5V
0.4V
15.4V
0.3V
0.8V
0.3V
1.8V
0.3V
2.0V
1.0V
0V
INPUT/FILTER (210-6415-160)
1050SW/SW-501
103SW/SW-301
210-6415-150
(210-6415-140)
U-COM (210-6415-130)
POWER AMP (210-6415-110)
IC601
IC204
IC851
IC651
IC402
IC401
IC404
IC441
IC403
-15V
-5V
-5V
220P
C228
1K
VR601
S IN
GND
DET
-V
GND
+V
GND
GND
AC-H2
-56.4V
-46.3V
A
A
55.8V
46.2V
1050
103
B
0.7V
2.3V
0V
A
B
A
A
A
B
B
B
A
C852
5.1V
0.2V
0.5V
0V
AC-H1
SIN
GND
SOUT
GND
CCW
CW
1
GND
CW
CCW
1
R410
+15V
D
GIND
CONT.B
CONT.A
PEAK
POWER
MUTE
4
8
100
Q254
10K
10K
DET
GND
SIN
SIN
GND
SOUT
CONT.A
CONT.B
GND
+15V
-V
GND
+V
-15V
+5V
+5V
+5V
+5V
+5V
+5V
-15V
-15V
+5V
+5V
+5V
+15V
+5V
+15V
+VCC
+VCC
-VCC
+VCC
-VCC
-V
+V
-5V
+5V
-5V
-15V
C241 0.01
0.01
2.2
R431
800MA 250V
800MA 250V
0.01
C808
3
1
2
C226
220P
C227
220P
C229
220P
R233
1K
100K
R234
1
3
2
7
6
5
4
3
2
1
R254
DET.
OFFSET
VOL.DET.
2
3
LATCH SW
AUTO RECOVERY
FLIP-
FLOP
1
0.047
C225
8
VCC
DRIVER
RELAY
7
6
VCC ON
OVER LOAD
DET.
AC OFF
MUTE
5
4
R413
100K
R416
100K
R415
100K
10
9
10
9
25
26
2
1
R438
1K
R411
100K
R412
100K
R414
100K
20V/4
24.5V/4
1050
103
AC-L2
LGND
AC-L1
AC-H2
GND
AC-H1
1W
R851
100
R433
3
2
1
VD
VI
GND
25
26
T1
R434
100
5
13
6
8
4
8
4
+15V
-15V
+5V
+15V
+15V
+V
-V
-15V
+15V
2
3
1
-
+
1K
R256
R258
10K
R228
47K
R227
47K
1u50
C222
+
1u50
+
C221
R260
C240
100P
R220 100
R226
-
+
R225
R224
9.1K
50K
VR201D
120K
0.039
C220
C218
0.047
4.7K
R221
120K
VR201C
50K
R223
9.1K
R222
0.12
C219
R219
VR201B
50K
220K
9.1K
R218
0.027
C215
C214
0.12
220K
R217
R235
220K
R231 5.6K
-12dB
-24dB
+
1.5K
R230
10u25
C223
1K
R229
R259
1K
R255
R257
10K
100K
R232
7
6
5
C224
10u25
+
10K
R252
1K
1K
R251
10K
R253
1
2
3
7
8
7
5
6
2
3
1
3
2
1
4
6
5
1
2
3
50K Cx4
7
6
5
1W
1W
+
47u10
C878
+
C877
47u10
1K
R878
R877
1K
R871
47u25
C875
+
47u25
+
C876
100u25
+
C871
+
C872
100u25
1K
R873
R874
1K
220P
C873
470
R875
R876
470
C874
220P
100P
R210
160K
C209
0.033
R212
33K
63
63
1W
1W
5W
x
2
1W
-
+
SP+
SP+
GND
+
-
Q602,603
+
R662
10K
2.2u50
C652
1K
R661
R663
R614
R615 10K
4.7K
0.047
C610
10
1W
R612
R613
R660
R664
470K
C609
100P
100P
C608
R611
0.22
+
C611
1u50
2.7
R609
1/4W
1/4W
R607 10
C607
10 1/4W
R608
C612
0.047
+
C211
0.01
100P
C212
C210
27K
R211
R213
180K
C205
0.18
0.18
C206
+
-
-
+
1/2W
1/2W
C202
100P
0.01
C201
-
+
R113
12K
8.2K
C102
L
H
X
X
NOR
REV
X
X
H
L
MUSIC
MOVIE
B
A
MODE
12
VR201A
50K
R216
9.1K
C217 0.01
4.7K
R215
C213
0.047
VSS
C.C
C.B
C.D
C.A
VDD
SWD
SWC
SWB
SWA
22K
+
C651
4.7u50
R651
R658
12K
56K
R655
R659
22u16
+
C656
C655
47u10
68K
R657
R654
22K
+
C659
22u16
R653
22K
R652
33K
C660
+
2.7K
1u50
R656
47K
10000u
C805
+
+
C806
10000u
0.01
C804
C803
0.01
0.01
C802
C801
0.01
R610
1/4W
2.7
10
9
C631
+
R632
1K
+
C606
100u63
R604
16K
R631
8
7
6
12
13
14
1
2
3
5
4
C604
100P
R602
47K
C602
100P
C601
10u25
+
C603
100u25
100u63
11
1K
R606
100P
C605
R605
2.7K
10K
R854
+
C813
100u25
1/4W
R811
1.5K
+
C853
2200u16
1000P
R633 270
R852
4.7K
2.7K
R855
R853
2.7K
R801
R802
AC-L2
D GND
AC-L1
AC-H2
AC-H1
+
+
2200u25
C812
C811
2200u25
8
7
6
5
4
3
2
1
PEAK
POWER
MUTE
1
2
3
2
1
3
3
2
1
1
2
3
F902
F903
1
2
3
4
5
6
7
8
9
MVR401
0.01
C411
3
2
3
2
1
2
3
0.1
C405
39
L401
R425
39
R426
L402
R430
1K
R429
10K
40
R622
22K
22K
R623
R624
100K
R621
220K
+
C851
1u50
+
R603
1K
R601
+
1u50
C621
220K
R625
C408
470u10
R424
560
560
R423
330
R427
R437
1K
R435
270
10K
R440
4.7K
R432
C410
12
123
R417
100K
R422
100K
R421
100K
R420
100K
R418
100K
R419
100K
38
39
40
IC404
IC441
R401
R402
R403
100K
100K
100K
R408
100K
R409
100K
R407
100K
R406
100K
R405
R404
100K
100K
100K
+
C403
47u10
C402
0.1
0.1
C401
R443
10K
C404
1000P
R444 10K
C443
+
2200u10
R445
10K
R441
1K
C442
4.7u25
+
R442
4.7K
10
9
8
6
7
5
3
1
2
4
X401
4.19MHz
C407
0.047
0.047
C406
TSW2(TURND)
TSW1(POWER)
26
27
TSW4(PHASE)
TSW3(SUBSD)
TSW5(B.BST)
30
29
28
TIO
TEST
SCK
INT
SO
16
17
14
15
13
V
O
G
12
3
4
-
+
R872
0.18
C208
R206
6.8K
R208
270K
R209
C207
270K
R207
C204
100
R205
C203
0.18
47K
R204
VOL.UP
VOL.DOWN
MUTE
POWER
22
24
23
NC
VDD
REMOTE
CE
21
19
20
ILL
31
T.04
T.05
33
32
25
T.02
SUBSO
T.01
35
36
37
34
T.03
REV
41
VOL
S.BST
39
40
38
42
VSS
NOR
SI
S.BOOST
POWER
SUBSONIC
ILL
SP
REV
18
12
10
11
8
9
6
7
X1
RESET
4
5
2
3
1
X2
+
C101
33u16
R111
22K
47K
R203
220K
R201
R202
47K
9
8
7
5
6
4
3
2
1
1
2
3
C107
47u16
+
R112 5.6K
C106 22P
R109
220P
+
-
R114
12K
-
+
C104 220P
R110 5.6K
0.01
C105
R115
1K
R101
4.7K
R103
1.2K
R104
1.2K
100K
R106
100K
R108
R105
100K
100K
R107
R102
4.7K
1
2
3
4
5
6
7
8
39
38
1K
R428
R436
10K
R439 4.7K
+
100P
C108
C103
100P
14
13
11
10
8
9
12
1
2
3
5
6
7
4
-15V
-5V
~
~
, B
A
VOLTAGE
D814
CN601
A
CONT.
CROSSOVER
SLOPE
: 2SC2878A
Q622
: PST600C.
IC441
MTZ16B
:
ZD871,872
MTZJ6.8B
:
ZD401
MTZJ5.1B
:
D815,ZD873,874
: MTZJ30B
ZD101,102
:
D801
1SR139-100
:
D413,651-653,811-814,851
1SS133
:
D411,412,414-419,631,852,853
B30-1822-08
:
D404
B30-1821-08
:
D403
B30-1820-08
:
D401,402
D412
SW201
JK102
Q251
Q252
Q253
Q254
B
CONT.
CN201A
W601
STAND-BY
SW401
W401
SP OUTPUT
D801
D413
STAND-BY
GREEN
D404
REV
NOR
PEAK
Q401
(BOTTOM VIEW)
SPK JACK
: NJM4558L
IC101,201-203
: TC4066BP
IC204
: uPD75004CU-076
IC401
: LB1641
IC402
: 78L05A
IC403
: W02-3003-08
IC404
: uPC1298V
IC601
: uPC1237HA
IC651
: NJM2072D
IC851
Q251,252,401-403,405,441,631,651,851
: 2SC1815GR
: 2SA1015GR
Q253,254,621,652
: 2SC1846
Q601
:
Q602
:
Q603
: 2SB1274
Q871
: 2SD1913
Q872
LED ON/OFF
BUFFER
(1/2)
IC203
IC203
(2/2)
(2/2)
IC202
CROSSOVER FREQUENCY(REAR)
ZD874
ZD873
W802
ZD872
ZD871
RY851
PROTECT IC
WOOFER
SPK1
MUTE
CN804
DRIVE
MUTE
FINAL TR.
DETECT
DC
PRE
DRIVE
IC
IDLE
ADJ.
DRIVE
RELAY
LIMIT
Q651
D652
Q603
Q602
D653
RY601
ON/OFF
SP
-15V AVR
Q871
15V AVR
Q872
MODE SW
(2/2)
IC201
(1/2)
IC202
AMP
IC204 MODE
D651
Q652
ON/OFF
POWER
RELAY
ON/OFF
Q622
D631
Q601
Q851
D853
Q631
CN803A
D852
D851
CN801
CN802
D811
D812
D813
SP
W801
CN803B
CN401A
CN201B
W402
CN402A
VOLUME
MOTOR
M
LAMP
CONT.
ON/OFF
LAMP
D416
D417
MOVIE
MUSIC
Q402
D402
D401
D403
D815
Q621
D411
Q403
ZD401
VOLUME
MOTOR
DRIVE
REMOTE SENSOR
RESET
5V AVR
u-COM
RESET IC
Q441
D415
D414
CN201C
ZD101
ZD102
(2/2)
IC101
(1/2)
IC201
IC101
(1/2)
INPUT
LINE
Rch
Lch
TO SP
Q405
D419
D418
JK101
Lch
SP
INPUT
Rch
Lch
Rch
(FROM AMP)
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
,
,
IN
GND
OUT
(
)
(
)
(
)
)
(
)
(
)
(
)
(
(
)
)
)
(
(
)
(
)
(
)
(
(
)
X
X
X
X
X
210-6415-120
TRANSFORMER
S1
S3
S2
S4
S5
TH
F901
120V
240V
1
2
SW902A
X
X
X
F904
T1,6AL
250V
USED
(M,I,Y) TYPE
1
2
C903
0.047
C902
0.047
1
2
4700P
C901
AC SW
CN901
SW901
: AC230V~ 50Hz
: AC240V~ 50Hz
: AC220V~ 50Hz
50/60Hz
: AC110-120V
/220-240V~
: AC120V 60Hz
(T,E,G)
(X)
(C)
(Y,M,I)
(K,P)
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. The measurement
value may vary depending on the measuring
instruments used or on the product.
2SA1015GR
2SC2878A
2SB1274
2SD1913
TC4066BP
NJM4558L
2SC1846
UPD75004CU-076
UPC1237HA
78L05A
LB1641
UPC1298V
PST600C
Note: 103SW(SW-301)/1050SW(SW-501)
103SW(K) PCB/SD 98.4.24 20:41 y[W 2
1050/103SW
770
620
660
600
643
643
103SW/SW-301
633
621
641
632
MVR401
642
642
603
603
640
640
611
SPK1
630x2
612
612
601
604
601
602
602
613
613
607
Gx2
Gx2
Dx2
Mx2
Mx2
Ex2
Ex2
771
771
771
630x2
771
782x2
M
M
MVR401
Dx2
Cx8
759
759
780
777
Jx6
771
773
781
Ax3
L
Ax3
Ax3
Ax3
Hx2
Lx2
Nx2
Nx2
Jx2
Jx2
F
F
K
K
K
K
775
774
772
776
778
779
7P
(CN201A)
3P
(CN804)
Bx2
Bx2
650
A
B
C
C
D
D
E
F
G
H
J
K
L
M
N
ø 4x14(BLK)
M4x16
ø 5x25(BLK)
ø 5x25(BLK)
ø 3x20(BLK)
ø 3x16(BLK)
ø 3x8
ø 3x6
ø 3x8
ø 3x10(BLK)
ø 3x8(BLK)
ø 3x10(BLK)
ø 3x10(BLK)
ø 3x8
ø 3x8
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
N44-4014-45
N35-4016-45
N09-3668-05(103SW)
N09-3672-05(1050SW)
N44-3020-45(103SW)
N62-3116-45(1050SW)
N09-3669-05
N89-3006-46
N83-3008-46
N89-3010-45
N89-3008-45
N34-3010-45
N82-3010-45
N82-3008-46
N89-3008-46
625
625
622
1
2
A
C
B
Parts
with
exploded
numbers
larger
than
700
are
not
supplied.
103SW/SW
-301/1050SW/SW
-501
EXPLODED
VIEW
(UNIT)
7
103SW/SW301(K)
COVER(
98.4.24
20:44
y[W
6