SKW-770 : 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 power cord into the AC outlet.
5. Confirm the voltage of above point after 6 minutes to 8 minutes. (Heat running)
6. 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.
7. Disconnect the power cord from the AC outlet.
8. Disconnect the DC voltmeter.
HTP-770
Trimming resistor
R544
Test point
P531
Test point
P531
100 ohm
(1/4W)
<Fig-1>
DC voltmeter
MAIN PC board ass'y "NAAF-8829"
Test point
P631
Short
Page 3
EXPLODED VIEWS-1
SKW-770 : POWERED SUBWOOFER
P901
A05
x 2 pcs.
A102
A103
HTP-770
SP11
x 10 pcs.
A02
A104
x 2 pcs.
A02
A03
A06
U01
A05
x 5 pcs.
U06
A101
A07
Q516
A08
x 2 pcs.
A05
Q541
A01
A07
A11
Q515
E801
Refer to "EXPLODED VIEWS-2"
SP12
x 4 pcs.
SP13
x 2 pcs.
U03
HTP-770
T901
F901
Page 4
HTP-770
EXPLODED VIEWS-2
SKW-770 : POWERED SUBWOOFER
SP01a (Subwoofer ass’y)
(All)
SP01b (Subwoofer ass’y)
(Without AMP unit, Speaker unit and Power transformer)
NOT MAGNETICALLY SHIELDEDNOT MAGNETICALLY SHIELDED
SP65SP67
SP68SP66
TERMINAL :
Tan / Black
HTP-770
"SKB-770 <R>""SKB-770 <L>"
NOT MAGNETICALLY SHIELDEDNOT MAGNETICALLY SHIELDED
Page 7
HTP-770
A
SCHEMATIC DIAGRAM
SKW-770 : POWERED SUBWOOFER
1
2
3
LINE INPUT
P301
C955
223J
E801
R301
1K
C301
C951
220/16
C952
220/16
224
R302
(MPP)
OUTPUT
LEVEL
C302
47/50
20KB
47K
R951
3.3K
POWER NEED TO CONFIRM
D951
MTZJ15C
D952
R952
MTZJ15C
(2W)
3.3K
R303
(2W)
3
2
27K
R304
Q301(1/2)
NJM4558LD
4
R305
33K
8
C303
NC
BCDEFGH
NOTE
THE COMPONENTS IDENTIFIED BY MARK ARE CRITICAL FOR SAFETY
NAAF-8829
MAIN PC BOARD
U01
47K
R307
2.2K
R306
J316
<Note>
1
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.
NC : No mount of parts.
CAUTION
FOR CONTINUED PROTECTION
AGAINST FIRE HAZARD, REPLACE
ONLY WITH FUSE OF SAME TYPE
VA
AND RATING INDICATED.
ATTENTION
AFIN D'ASSURER UNE PROTECTION
PERMANENTE CONTRE LES RISQUES
D'INCENDIE, REMPLACER UNIQUEMENT
VA
PAR UN FUSIBLE DE MEME TYPE
ET CALIBRATION COMME INDIQUE.
THIS SYMBOL LOCATED NEAR THE FUSE INDICATES
THAT THE FUSE USED IS SLOW OPERATING TYPE
FOR CONTINUED PROTECTION AGAINST FIRE
HAZARD,REPLACE WITH SAME TYPE FUSE. FOR FUSE
RATING REFER TO THE MARKING ADJACENT TO THE SYMBOL.
CE SYMBOLE INDIQUE QUE LE FUSIBLE UTLISE EST
E LENT.POUR UNE PROTECTION PERMANENTE,N'UTILISER
QUE DES FUSIBLES DE MEME TYPE. CE DARNIER EST
INDIQUE LA QU LE PRESENT SYMBOL EST APPOSE.
P501B
NC
C502
NC
(1/2W)
R651
12K
D651
1SS133
C501
47/50
C527
1/50
R501
1K
R502
47K
R510
100K
R505
1K
(1/4W)
Q501
2SC2240-BL
0
C503
224J
R521
220
D501
MTZJ5.6B
R506
1K
(1/4W)
Q502
2SC2240-BL
-0.6
R522
220
R503
5.6K
Q503
2SC2240-BL
R504
2.2K
R509
1K
R527
270
C504
220/16
C505
020
R507
33K
0
R508
47
(1/4W)
R511
82
(1/4W)
Q505
2SA949-Y
Q507
2SA949-Y
2SA949-Y
070
2SC2229-Y
Q506
2SC2229-Y
R512
68
(1/4W)
Q509
C506
R515
12K
R516
12K
Q510
R513
82
(1/4W)
R514
82
R541
820
2SC3423
R542
150
R544
100B
ADJUST.
IDLING
(1/4W)
R517
-1
Q541
3.3K
1
Q517
2SA933S-S
R543
180
-1.6
C517
10/50
C514
101
Q518
2SC2235-Y
1.6V
C528
Q519
2SA965-Y
(1/2W)
10/50
R528
390
C526
10/50
Q513
2SC5171
Q514
2SA1930
Q515
R526
82
(1/2W)
R531
0.22
(5W)
2SA1987-O/R
Q516
2SC5359-O/R
R533
3.3
(1W)
C519
224
C520
224
P531
SPEAKER
JL535A/B
!
4
5
10/50
5.6K
C601
R601
100K
Q301(2/2)
NJM4558LD
5
6
D601
MTZJ2.7B
180
R602
R604
C602
10/50
8
4
R603
150K
7
D602
MTZJ2.7B
D603
1SS133
R605
22
C603
470/16
P633
39K
R609
NC
Q602
KRC103M
R610
560K
820K
120K
R614
39K
R611
R612
Q603
2SC1740S-S
470K
R613
D605
1SS133
C950
104/50
Q604
2SA933S
R617
1K
R615
22K
R619
22K
R620
100K
R616
100K
D607
1SS133
Q605
2SA933S
R621
1K
P632A
REDBLUE
Q606
KRA103M
P631
2SA933S
Q607
R622
10K
5.0
R624
100K
R623
100K
Q608
2SC1740S-S
R626
2.2M
0.05
0.6
R625
180K
R627
680K
C604
33/35
Q609
NC
D606
1SS133
R628
330K
R629
NC
R701
NC
+5.6V
R904
1K
(1/2W)
10K
D904
MTZJ5.6B
R903
820
820
C909
22/50
R901
(1W)
R902
(1W)
-56.5V
D902
RL1N4003
or GP104003E
D903
RL1N4003
or GP104003E
+56.5V
D901
D3SBA20
C905
5600/71(MPP)
5600/63(MDD)
C906
5600/71(MPP)
5600/63(MDD)
C903
C904
104J/100
(MPP TYPE)
104J/100
(MPP TYPE)
U03
P903A
POWER TRANSFORMER
PC BOARD
MDC
ONLY
T901
NPT-1578D
P901A
NAPS-8831
5A/125V
F901
J901
MD
P902A
P901
AC 120V / 60Hz
LED
Page 8
HTP-770
A
PRINTED CIRCUIT BOARD VIEWS-1
SKW-770 : POWERED SUBWOOFER
1
U01
2
3
4
5
MAIN PC BOARD (NAAF-8829)
Component side
R545
NCAF-8829
25138829E
2
BCE
J308
Q515
22
B
J323
CE
17
J334
R531
R533
C906
25
Q516
E701
Q541
+Vcc
CEB
R701
J314
12
R952
D952
C955
J307
J324
J955
7
C952
C951
P301
C519
D951
D902
R544
R526
J332
7
C906
P301
P531
J325
-Vee
Q513
Q514
J322
J956
R508
C520
7
R901
C526
J352
BCD
C315
C316
76543218
P912
R320
R319
R317
C314
C312
C313
8123 4567
R316
C303
J327
R610
R616
J341
Q603
R306
R307
R305
7
P632A
R312
R314
C311
R315
7
Q301
R621
J309
R609
J337
R313
E801
1
2345678
Q602
7
P631
J344
P911
C601
R601
R602
C602
R604
R603
D601
D602
D603
R605
C603
Q605
R620
D605
R614
R613
R612
J342
P633
R311
J335
P301A
J336
R543
R542
J306
ECB
ECB
R514
Q510
Q506
Q507
J321
J320
J340
C903C904
REDREDBLK
R301
15
JL535B
RED
+Vcc
7
R951
R902
C301
R528
R512
J333
17
P903A
D903
R541
C527
15
12
C528
J312
7
JL535A
BLACK
J330
J331
17
R517
Q517
Q518
J311
J313
J319
20
C909
D901
R302
J303
J304
C514
C502
R510
J305
Q519
R516
J351
R904
D501
C517
R515
C504
12
R903
D904
Q504
R513
R507
R509
C503
R502
R527
P502A
C905
J346
R628
C505
D606
R625
R627
R629
R504
Q502
J347
C604
R651
Q503
C506
R522
C950
Q609
R503
J310
R501
C501
R321
C905
Q505
Q501
7
R623
R624
R626
Q608
R302
Q509
J318
R615
Q606
R511
R505
R506
J338
R619
R521
J316
7
Q604
Q607
D651
20
J326
7
J329
J348
J349
J302
D607
7
J301
Q302
R304
R303
J350
Q303
7
R617
R611
R622
C302
Page 9
HTP-770
A
PRINTED CIRCUIT BOARD VIEWS-2
SKW-770 : POWERED SUBWOOFER
1
U03
2
POWER TRANSFORMER PC BOARD (NAPS-8831)
Component side
15
15
P905A
T901
BCD
15
15
J905
J904
J903
J902
T901
810121416
2356
3
P902A
1
RISK
OF
FIRE
-REPLACE FUSE
AC-GAC-H
J901
P906A
P907A
F901A
4
AC-G
AC-H
NCPS-8831
2
25138831
5A/125V
F901
AS MARKED.
P901A
F901B
P903A
5
Page 10
EXPLODED VIEWS PARTS LIST
1/12 PAGE
HTP-770
NOTE : THE COMPONENTS IDENTIFIED BY THE MARK
! ARE CRITICAL FOR RISK OF FIRE AND
ELECTRIC SHOCK. REPLACE ONLY WITH PART
NUMBER SPECIFIED.
REF. NO.PART NAMEDESCRIPTIONQ'TY PART NO. (SN)REMARKS
EXPLODED
SKW-770 (B) : POWERED SUBWOOFER
EXPLODED
AMPLIFIER SECTION (SKW-770)
EXPLODED
Q515 TR2SC5359-R12203082
EXPLODED
Q515 orTR2SC5359-O(1) 2203083
EXPLODED
Q516 TR2SA1987-R(Q)12203072
EXPLODED
Q516 orTR2SA1987-O(1) 2203073GR
EXPLODED
Q541 TR2SC3423-Y12202104
EXPLODED
Q541 orTR2SC3423-O(1) 2202103
EXPLODED
<Note>
EXPLODED
When replacement the following the transistor, made from the same HFE rank as the original type.
EXPLODED
Q515, Q516, Q541
EXPLODED
A01 HEAT SINK230127160591
EXPLODED
A02 CUSHION---228141682
EXPLODED
A03 CUSHION---128141691
EXPLODED
A05 SCREW3TTB+8B(3BC)8838430088GR
EXPLODED
A06TAPETAPE(CLOTH-16U)(1) 29110083
EXPLODED
A07 ISO SHEETAC2622223025
EXPLODED
A08 SCREW3SMS8W.SW+14B(CU)2801634
EXPLODED
A11 RETAINER(PCB)127142025
EXPLODED
A101 REAR PANEL(MDD)127124058
EXPLODED
A102 BUSHINGS-RELIEF #2271127300750
EXPLODED
A103 KNOB(VOL)128326463
EXPLODED
A104 SCREW3SMS8W.SW+14B(3BC)2801433GR
EXPLODED
F901 FUSE5A-UL/T-2331252326GR
EXPLODED
P901 AC CORDAS-UC-21253368BLTK
EXPLODED
P901 orAC CORDAS-UC-2(1) 253368AYUN
EXPLODED
T901 P TRANSNPT-1578D12301948
EXPLODED
E801 WIRE TIEBSK-11260208
<Notes>
<L> : Lch
<R> : Rch
!
!
!
!
N
!
!
!
!
!
Page 11
EXPLODED
U01MAIN PC BOARD ASS'YNAAF-8829-1AD*11B138529-1AD
EXPLODED
U03
EXPLODED
U06HOLDER PC BOARDNAETC-88341---NSP
EXPLODED
SPEAKER SECTION (SKW-770)
EXPLODED
SP01aSPK SYSTEM ASS'Y(ALL)SKW-770 (B) MDC1000-SKW770BMDCCSER