SKW-980 : POWERED SUBWOOFER (EuP AMP.) /
ADJUSTMENT OF IDLING CURRENT
[When]
1. Exchange transistors (Q505 - Q519).
2. Exchange MAIN PC board ass'y (BAAF-0491).
[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. Press POWER button to turn on the unit. (MPP 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.
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.
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.
POWER TRANS. PC BOARD
U02
BAPS-0492
C916
MKP_R46_103M
RL901
J996
J997
J998
J999
DTC123JS
R954
D918
1SS133
F901
LIST
Q901
NRL-1P5A-DC9-179
4
4
32
32
C915
224J
D917
1SS133
27mA(MAX70mA)
33(1/2W)
D920
MTZJ9.1B
C911
C912
C914
1
1
1000/25
D911
1SS133
1000/25
D913
1000/25
1SS133
LIST
P906B
P906C
94
2
2
1
1
LIST
T902
5mAMAX
AC8.89V
NPLG-2P632
P902A
NPLG-2P632
J991
LIST
J992
C921
LIST
1
6
5
8
C919
104J
P906A
P903B
P903C
P903D
P903A
NPLG-4P151
P908A
NPLG-5P133
NSAS-10P1152
P908B
1
1
1
HOT
AGND
COLD
1
2
3
4
5
TRANS
T901
LIST
8
14
6
12
5
10
1
7
1mA
J995
GND
LIST
R981
R984
470(1W)
470(1W)
470(1W)
LIST
+10V
-10V
R982
R983
2
1
AC_CORD
2 1
C920
S901
BASW-0494
NRC-11007P
DE1007E472M-KY
HTP-980
A
BCDEFGH
SCHEMATIC DIAGRAMS-2
SKW-938 (MPP model) : POWERED SUBWOOFER (EuP AMP with protection.)
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.
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.
POWER TRANS. PC BOARD
U02
BAPS-0492
C916
MKP_R46_103M
RL901
J996
J997
J998
J999
DTC123JS
R954
D918
1SS133
F901
LIST
Q901
NRL-1P5A-DC9-179
4
4
32
32
C915
224J
D917
1SS133
27mA(MAX70mA)
33(1/2W)
D920
MTZJ9.1B
C911
C912
C914
1
1
1000/25
D911
1SS133
1000/25
D913
1000/25
1SS133
LIST
P906B
P906C
94
2
2
1
1
LIST
T902
5mAMAX
AC8.89V
NPLG-2P632
P902A
NPLG-2P632
J991
LIST
J992
C921
LIST
1
6
5
8
C919
104J
P906A
P903B
P903C
P903D
P903A
NPLG-4P151
P908A
NPLG-5P133
NSAS-10P1152
P908B
1
1
1
HOT
AGND
COLD
1
2
3
4
5
TRANS
T901
LIST
8
14
6
12
5
10
1
7
1mA
J995
GND
LIST
R981
R984
470(1W)
470(1W)
470(1W)
LIST
+10V
-10V
R982
R983
2
1
AC_CORD
2 1
C920
S901
BASW-0494
NRC-11007P
DE1007E472M-KY
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