Onkyo SKW-204 User Manual
SERVICE MANUAL
SERVICE MANUAL
POWERED SUBWOOFER
MODEL SKW-204(B)/(S)/(Y)
SKW-204
Ref. No. 3946
052006
B MDC
B MPP
S MPP
Black, Silver and Yellow models
120V AC, 60Hz
230-240V AC, 50Hz
230-240V AC, 50Hz
SAFETY-RELATED COMPONENT
WARNING!!
COMPONENTS IDENTIFIED BY MARK ON THE
SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE
CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
REPLACE THESE COMPONENTS WITH ONKYO
PARTS WHOSE PART NUMBERS APPEAR AS SHOWN
IN THIS MANUAL.
MAKE LEAKAGE-CURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE
SUPPLY CIRCUIT BEFORE RETURNING THE
APPLIANCE TO THE CUSTOMER.
S MPA
S MWT
Y MWT
230-240V AC, 50Hz
120/220-240V AC, 50/60Hz
120/220-240V AC, 50/60Hz
SKW-204
EXPLODED VIEWS-1
AMPLIFIER SECTION
P901
A102
A103
A05
x 2 pcs.
A05
x 2 pcs.
A02
SP11
x 10 pcs.
A06
A02
U06
A101
A07
S901
A103
Q516
A05
x 4 pcs.
Q541
A08
x 2 pcs.
A05
A07
A01
A11
A05a
x 2 pcs.
A03
Q515
U02
SP12
x 4 pcs.
<Note>
U04 (VOLTAGE SELECTOR PC BOARD) : MWT type only.
F902
U04
U05
A04
Refer to "EXPLODED VIEWS-2"
SP13
x 2 pcs.
U03
T901
F901
<Note>
F901C (LABEL) : MPP/MPA type only.
Part No. (SN) ---> Refer to
"PRINTED CIRCUIT BOARD PARTS LIST".
U01
A05
x 5 pcs.
SKW-204
F901C
EXPLODED VIEWS-2
SPEAKER SECTION
SKW-204
SP01a - c
SP07a / b
SP08
SP06
SP02
x 4 pcs.
SP04
x 4 pcs.
SP03
x 4 pcs.
SP05a / b
SP04
x 6 pcs.
SP09a - c
SP11
x 2 pcs.
SKW-204
SCHEMATIC DIAGRAM
SKW-204
A
1
2
3
4
5
BCDEFGH
J317
FOR SKW-204AMP
J316
FOR SKW-540AMP
S101
Q302(1/2)
NJM4558LD
3
8
2
4
1
E801
Q302(2/2)
NJM4558LD
4
8
5
6
7
Q301(2/2)
NJM4558LD
4
8
5
6
7
Q301(1/2)
NJM4558LD
3
2
1
8
4
Q602
KRC103M
Q606
KRA103M
P301
R651
12K
(1/2W)
R951
3.3K
POWER NEED TO CONFIRM
(2W)
R952
3.3K
(2W)
0
-0.6
0
0.05
0.6
5.0
5.6
R609
39K
R611
820K
R610
560K
R616
100K
R617
1K
R621
1K
R615
22K
R612
39K
R614
120K
R613
470K
R619
22K
R620
100K
R624
100K
R623
100K
R627
680K
R622
10K
R626
2.2M
R625
180K
P632A
RED
GREEN
D601
MTZJ2.7B
D602
MTZJ2.7B
D501
MTZJ5.6B
D952
MTZJ15C
D951
MTZJ15C
Q507
2SA949-Y
Q505
2SA949-Y
Q509
2SA949-Y
Q604
2SA933S
Q605
2SA933S
Q607
2SA933S
Q506
2SC2229-Y
Q510
2SC2229-Y
Q503
2SC2240-BL
Q502
2SC2240-BL
Q501
2SC2240-BL
Q603
2SC1740S-S
Q608
2SC1740S-S
P501B
P633
P631
D651
1SS133
D603
1SS133
D605
1SS133
R302
20K
R101
20K
C301
C303
NC
C955
223J
C313
124
C312
334J
C506
070
C502
NC
C505
020
C503
224J
C950
104/50
C311
100/25
C302
47/50
C314
47/16
C527
1/50
C501
47/50
C504
220/16
C951
220/16
C952
220/16
C601
10/50
C603
470/16
C602
10/50
C604
33/35
R306
47K
R301
1K
R311
100K
R313
3.3K
R312
100K
R314
3.3K
R315
3.3K
R307
220*
R305
22K*
R303
47K
R304
2.2K*
R316
10K
R508
47
(1/4W)
R511
82
(1/4W)
R512
68
(1/4W)
R514
82
R513
82
(1/4W)
R516
12K
R515
12K
R502
47K
R510
100K
R505
1K
(1/4W)
R506
1K
(1/4W)
R507
33K
R527
270
R509
1K
R504
2.2K
R503
5.6K
R522
220
R521
220
R501
1K
R603
150K
R601
5.6K
R605
22
R602
100K
R604
180
FOR SKW-204AMP
NAAF-8830
PHASE SWITCH
OFF
ON
NAAF-8829
224
(PP/PA/WT)
NC
NC
NC
MAIN PC BOARD
U01
LINE INPUT
OUTPUT
LEVEL
LED
<Note>
NC : No mount of parts.
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