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.
EXPLODED VIEWS-1
HTP-940
SKW-940 : POWERED SUBWOOFER
SP11
P901
A05
x 2 pcs.
A102
A103
A05
x 2 pcs.
A02
x 10 pcs.
A03
A02
U06
A101
A07
S901
Q516
<Note>
S901 (POWER SWITCH) and U05 : MPP type only.
U05
A08
x 2 pcs.
A05
Q541
Q515
A07
A01
A11
SP12
x 4 pcs.
Refer to "EXPLODED VIEWS-2"
SP13
x 2 pcs.
U03
T901
F901
A05
x 5 pcs.
<Note>
F901C (LABEL) : MPP type only.
Part No. (SN) ---> Refer to
"PRINTED CIRCUIT BOARD PARTS LIST".
U01
HTP-940
F901C
EXPLODED VIEWS-2
SKW-940 : POWERED SUBWOOFER
SP08
HTP-940
SP01a / SP01b
SP02
x 4 pcs.
SP04
x 4 pcs.
SP03
x 4 pcs.
SP07
SP04
x 8 pcs.
SP09
HTP-940
HTP-940
EXPLODED VIEWS-3
SKF-940F <L> / SKF-940F <R>
SP32a / SP32b
Lch
TERMINAL :
White / Black
Rch
TERMINAL :
Red / Black
SP33a - SP33d
SP21a - SP21d
with Catching Holder (SP22) / without Terminal (SP32)
SP23
SP26
x 4 pcs.
SP31
SP34
TWEETER
INPUT
(Terminal)
WOOFER
WOOFER
SP22
x 4 pcs.
SP23
SP24
SP27
x 4 pcs.
HTP-940
SP26
x 4 pcs.
EXPLODED VIEWS-4
SKC-940C
HTP-940
SP41a / SP41b
with Catching Holder (SP42) / without Terminal (SP52)
SP53a /
SP53b
SP52
TERMINAL :
Green / Black
SP42
x 4 pcs.
SP51
TWEETER
WOOFER
WOOFER
INPUT
(Terminal)
SP43
SP46
x 4 pcs.
SP44
SP47
x 4 pcs.
SP43
SP46
x 4 pcs.
SP54
HTP-940
EXPLODED VIEWS-5
SKM-940S <L> / SKM-940S <R>
SP73a - SP73d
Lch
TERMINAL :
Blue / Black
Rch
TERMINAL :
Gray / Black
SP72a / SP72b
SP76
x 2 pcs.
SP75
SP61a - SP61d
with Catching Holder (SP62) / without Terminal (SP72)
SP65
SP64
SP71
SP67
x 4 pcs.
HTP-940
TWEETER
INPUT
(Terminal)
WOOFER
SP62
x 4 pcs.
SP74
SP63
SP66
x 4 pcs.
HTP-940
EXPLODED VIEWS-6
SKB-940 <L> / SKB-940 <R>
SP93a - SP93d
Lch
TERMINAL :
Brown / Black
Rch
TERMINAL :
Tan / Black
SP92a / SP92b
SP96
x 2 pcs.
SP95
SP81a - SP81d
with Catching Holder (SP82) / without Terminal (SP92)
SP85
SP84
SP91
SP87
x 4 pcs.
HTP-940
TWEETER
INPUT
(Terminal)
WOOFER
SP82
x 4 pcs.
SP94
SP83
SP86
x 4 pcs.
HTP-940
SCHEMATIC DIAGRAM
SKW-940 : POWERED SUBWOOFER
HTP-940
A
1
2
3
4
5
BCDEFGH
J316
E801
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
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
C301
C303
NC
C955
223J
C506
070
C502
NC
C505
020
C503
224J
C950
104/50
C302
47/50
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
R307
220*
R305
8.2K*
R303
47K
R304
2.2K*
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
NAAF-8829
(MPP)
224
NC
NC
MAIN PC BOARD
U01
LINE INPUT
OUTPUT
LEVEL
LED
HTP-940
+5.6V
-56.5V
+56.5V
P907A
P906A
J901
MD
R901
820
(1W)
R902
820
(1W)
1
1.6V
-1.6
-1
D901
D3SBA20
R544
100B
R528
390
(1/2W)
R628
330K
R629
NC
R701
NC
R904
1K
(1/2W)
R903
10K
S901
P901
P901
F901
5A/125V
F901
1.6A/250V
T901
NPT-1539D
T901
NPT-1539P
P903B
P903B
J903A
D904
MTZJ5.6B
Q516
2SA1987-O/R
Q519
2SA965-Y
Q517
2SA933S-S
Q514
2SA1930
Q541
2SC3423
Q515
2SC5359-O/R
Q513
2SC5171
Q518
2SC2235-Y
Q609
NC
P902A
P906B
P902A
JL535A/B
P531
D606
1SS133
D903
RL1N4003
or GP104003E
D902
RL1N4003
or GP104003E
C514
101
C520
224
C519
224
C903
104J/100
(MPP TYPE)
C904
104J/100
(MPP TYPE)
C517
10/50
C528
10/50
C526
10/50
C909
22/50
C604
33/35
C906
5600/71
C905
5600/71
R531
0.22
(5W)
R533
3.3
(1W)
R514
82
(1/4W)
R513
82
(1/4W)
R543
180
R526
82
(1/2W)
R517
3.3K
R541
820
R542
150
NAPS-8831
AC 230-240V / 50Hz
NAPS-8831
MDC
ONLY
MPP
ONLY
AC 120V / 60Hz
NASW-8833
AGAINST FIRE HAZARD, REPLACE
VA
FOR CONTINUED PROTECTION
AND RATING INDICATED.
ONLY WITH FUSE OF SAME TYPE
CAUTION
ATTENTION
ET CALIBRATION COMME INDIQUE.
D'INCENDIE, REMPLACER UNIQUEMENT
PERMANENTE CONTRE LES RISQUES
AFIN D'ASSURER UNE PROTECTION
PAR UN FUSIBLE DE MEME TYPE
VA
E LENT.POUR UNE PROTECTION PERMANENTE,N'UTILISER
INDIQUE LA QU LE PRESENT SYMBOL EST APPOSE.
QUE DES FUSIBLES DE MEME TYPE. CE DARNIER EST
CE SYMBOLE INDIQUE QUE LE FUSIBLE UTLISE EST
FOR CONTINUED PROTECTION AGAINST FIRE
RATING REFER TO THE MARKING ADJACENT TO THE SYMBOL.
HAZARD,REPLACE WITH SAME TYPE FUSE. FOR FUSE
THIS SYMBOL LOCATED NEAR THE FUSE INDICATES
THAT THE FUSE USED IS SLOW OPERATING TYPE
THE COMPONENTS IDENTIFIED BY MARK ARE CRITICAL FOR SAFETY
REPLACE ONLY WITH PART NUMBER SPECIFIED.
VOLTAGE (MEASURED WITH VOLTMETER) IS DC VOLTAGE.(NO INPUT SIGNAL).
ALL PNP TRANSISTORS ARE EQUIVALENT TO 2SA1015-GR UNLESS OTHERWISE NOTED.
ALL NPN TRANSISTORS ARE EQUIVALENT TO 2SC1815-GR UNLESS OTHERWISE NOTED.
ALL DIODES ARE EQUIVALENT TO 1SS133 UNLESS OTHERWISE NOTED.
ELECTROLYTIC CAPACITORS ( ) ARE IN uF/WV.
ALL CAPACITORS ARE IN pF/50WV UNLESS OTHERWISE NOTED.
EX) 030- 3pF 330- 33pF 331- 330pF 333- 0.033uF
ALL RESISTORS ARE IN OHMS 1/4WATTS UNLESS OTHERWISE NOTED.
THE THICK LINES ON PC BOARD ARE THE PRINTING SIDE OF THE PARTS.
EX) PRINTING SIDE
CIRCUIT IS SUBJECT TO CHANGE FOR IMPROVEMENT.
!
NOTE
POWER SWITCH
PC BOARD
U05
POWER TRANSFORMER
PC BOARD
U03
POWER TRANSFORMER
PC BOARD
U03
POWER
SWITCH
SPEAKER
MPP ONLY
ADJUST.
IDLING
<Note>
NC : No mount of parts.
HTP-940
A
PRINTED CIRCUIT BOARD VIEWS-1
SKW-940 : POWERED SUBWOOFER
1
2
3
4
MAIN PC BOARD (NAAF-8829)U01
Component side
NCAF-8829
1
BCE
J308
Q515
22
J323
B
CE
17
Q541
+Vcc
J334
C906
CEB
25
Q516
E701
R701
25138829A
J307
J314
J324
12
R531
C519
R533
D951
C951
J955
R952
7
C952
D952
P301
C955
R545
R544
P531
J325
J332
7
C906
D902
R526
-Vee
J956
P301
Q513
Q514
R508
J322
7
C526
J320
C520
J352
R901
BCD
R543
R542
J306
ECB
ECB
R514
Q510
Q506
Q507
J321
J340
C903C904
REDREDBLK
R902
15
+Vcc
7
R301
R512
JL535B
RED
20
J330
J333
R951
D903
C301
C527
15
R528
C528
J331
17
17
P903A
R517
Q517
Q518
R541
12
J311
J312
J313
7
J319
JL535A
BLACK
C909
D901
R302
C514
R516
C502
J351
R510
D501
J303
J304
J305
Q519
R515
R904
R903
C517
C504
12
D904
Q504
R507
R527
P502A
C505
R509
C503
R502
C905
R628
R629
R513
J346
D606
R504
Q502
C604
R625
R627
R522
J347
Q609
R651
Q503
C506
C905
C950
R503
J310
R501
C501
R321
R302
Q505
Q501
20
7
Q604
R623
R624
R626
Q608
Q509
R521
J318
R619
Q606
D651
R511
R505
R506
J338
R615
Q607
7
7
J348
J302
J316
J326
J329
J349
7
Q303
7654 3218
J301
7
Q302
R304
R303
J327
7
R617
R611
Q603
J350
R622
C302
81234567
R306
R307
C303
R305
R610
R616
J341
7
Q301
R621
P632A
C313
R316
R312
R314
C311
R315
J309
J337
C316
R320
R319
R317
C314
C312
E801
R609
7
P631
J344
C315
R313
1
2345 678
Q602
P911
C601
R601
R602
C602
R604
R603
D601
D602
D603
R605
C603
P633
Q605
R620
D605
R614
R613
R612
J342
P912
R311
J335
P301A
J336
5
ADJUSTMENT PROCEDURE
SKW-940 : POWERED SUBWOOFER / ADJUSTMENT OF IDLING CURRENT
[When]
1. Exchange transistors (Q505 - Q519).
2. Exchange MAIN PC board ass'y (NAAF-8829).
[Procedure]
<Note> No speaker load and No input signal.
1. Short test point P631 for amplifier is under active mode.
2. Adjust the trimming resistor R544 so that the reading of multimeter becomes 52 ohm to 53 ohm.
3. Connect the DC voltmeter to test point P531. <Fig-1>
4. Connect the AC power cord into a wall outlet.
5. Press POWER button to turn on the unit. (MPP type only)
6. Confirm the voltage of above point after 6 minutes to 8 minutes. (Heat running)
7. When less than 3.20 mV : Readjust the trimming resistor above so that the voltage becomes 4.5 mV to 5.0 mV.
When 3.30 mV to 5.20 mV : Not necessary to adjust.
When 5.21 mV to 10.0 mV : Readjust the trimming resistor above so that the voltage becomes 5.0 mV to 5.5 mV.
When 10.1 mV to 20.0 mV : Readjust the trimming resistor above so that the voltage becomes 5.6 mV to 6.0 mV.
8. Press POWER button to turn off the unit. (MPP type only)
9. Disconnect the DC voltmeter.
10. Disconnect the AC power cord from a wall outlet.