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.
!
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.
SPEAKER
JL535A/B
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.
U03
POWER TRANSFORMER
PC BOARD
MPA
ONLY
T901
NPT-1539P
P901A
NAPS-8831
1.6A/250V
F901
P907A
P906A
POWER SWITCH
U05
PC BOARD
P906B
NASW-8833
MPA ONLY
S901
POWER
SWITCH
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
C906
5600/71
C903
C904
104J/100
(MPA TYPE)
104J/100
(MPA TYPE)
U03
P903A
P902A
POWER TRANSFORMER
PC BOARD
MDD/MDC
ONLY
T901
NPT-1539D-1562D
P901A
NAPS-8831
5A/125V
F901
J901
MD
P902A
P901
AC 230-240V / 50Hz
P901
AC 120V / 60Hz
Page 7
HTP-650
A
PRINTED CIRCUIT BOARD VIEWS-1
SKW-750 : 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
R952
C955
J955
7
C952
D952
7
D951
C951
P301
R545
R544
P531
J325
J332
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
R510
J303
J304
C514
R516
C502
J351
R904
D501
J305
Q519
R515
C504
R903
D904
C517
P502A
12
Q504
R507
R527
C905
R513
C505
R509
C503
R502
R628
R629
J346
D606
R625
R627
R504
Q502
C604
R522
J347
Q609
R651
Q503
C506
R503
R501
C501
C905
C950
J310
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
J316
J326
J329
J348
J302
J349
J350
7
Q303
7654 3218
J301
7
Q302
R304
R303
J327
R617
R611
Q603
R622
C302
81234567
R306
R307
C303
R305
7
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
J335
P301A
R311
J336
5
Page 8
HTP-650
A
PRINTED CIRCUIT BOARD VIEWS-2
SKW-750 : POWERED SUBWOOFER
1
2
POWER TRANSFORMER PC BOARD (NAPS-8831)U03
Component side
P905A
T901
15
15
BCD
J905
J904
15
15
J903
J902
T901
810121416
2356
1
3
P902A
AC-G AC-H
AC-G
RISK
-REPLACEFUSE
AS MARKED.
AC-H
P910A
P906A
J901
F901A
P907A
4
1
5A/125V
NCPS-8831
25138831
F901B
F901
OF
FIRE
P910A
P903A
P903A
POWER SWITCH PC BOARD (NASW-8833)U05
Component side
P906B
C901
S901
5
AC-GAC-H
NCSW-8833
25138833
J908B
BLACK
<Note>
MPP/MPA type only
1
Page 9
ADJUSTMENT PROCEDURE
SKW-750 : 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. (MPA 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. (MPA type only)
9. Disconnect the DC voltmeter.
10. Disconnect the AC power cord from a wall outlet.