Sony SAW-M20 User manual

1
SA-WM20
SERVICE MANUAL
ACTIVE SUBWOOFER
US Model
Canadian Model
AEP Model
UK Model
E Model
SPECIFICATION
Ver.1.0 2001.1
Sony Corporation
Audio Entertainment Group
General Engineering Dept.
9-873-806-11
2001A0900-1
© 2001. 1
System
Type
Active Subwoofer (magnetically shielded design)
Speakerunit
Woofer: 20 cm dia. (8 in.), cone type
Amplifiersection
Continuous RMS output :
Canadian model (0.8%) 50W
European model (DIN) 50 W
Other models (0.8%) 50 W
Reproduction frequencyrange
28 Hz – 200 Hz
High frequency cut-off frequency
50 Hz – 200 Hz
Phaseselector
NORMAL, REVERSE
Inputs
Input jacks
LINE IN: input pin jack
SPEAKER IN: input terminals
Output jacks
SPEAKER OUT: output terminals
General
Powerrequirements
Canadian model: 120 V AC, 60 Hz
European model: 230 V AC, 50/60 Hz
Powerconsumption
50 W
Dimensions
Approx. 270 x 325 x 385 mm
(10
3
/
4
x 12
7
/
8
x 15
1
/
4
in.) (w/h/d)
Mass
10 kg (22 lb 1oz)
Supplied accessories
Foot pads (4)
Audio connecting cord (1 phono plug – 1 phono
plug), 2 m (6 ft 6
1
/
2
in.) (1)
Speaker cords, 2.5 m (8 ft 2
1
/
2
in.) (2)
Design and specifications are subject to change
without notice.

2
SA-WM20
TABLE OF CONTENTS
1. GENERAL .......................................................................... 3
2. DIAGRAMS
2-1. Circuit Boards Location ........................................................ 3
2-2. Printed Wiring Board ............................................................ 4
2-3. Schematic Diagram ............................................................... 5
3. EXPLODEDVIEW
3-1. Front Section ......................................................................... 6
3-2. Amp Section ......................................................................... 6
4. ELECTRICAL PARTS LIST ......................................... 7
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINEWITH
MARK 0ON THE SCHEMATIC DIAGRAMS AND INTHE PARTS
LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS PAR UNE MARQUE 0SUR LES
DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.
After correcting the original service problem, perform the
following safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.
LEAKAGE
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The “limit” indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples of
a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)
SAFETY CHECK-OUT
(US model)
Fig. A. Using an AC voltmeter to check AC leakage.
0.15µF
To Exposed Metal
Parts on Set
1.5kΩ
AC
voltmeter
(0.75V)
Earth Ground

33
SA-WM20
SECTION 1
GENERAL
• Location of controls
– Front view (a part) –
SECTION 2
DIAGRAMS
1 2 3 4 5
1POWER (@/1) button
2POWER indicator
3PHASE (4NORMAL/$REVERSE) button
4CUT OFF FREQ dial
5LEVEL dial
For schematic diagrams.
Note:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ωand 1/4W or less unless otherwise
specified.
•C: panel designation.
For printed wiring boards.
Note:
•X: parts extracted from the component side.
•Y: parts extracted from the conductor side.
•b: Pattern from the side which enables seeing.
• : B+ Line.
• : B– Line.
• Voltagesaredcwithrespect to groundunderno-signalcon-
ditions.
no mark : Power on
∗: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10MΩ).
Voltage variations may be noted due to normal preduction
tolerances.
• Signal path.
K: AUDIO
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND
SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
2-1. Circuit Boards Location
MAIN board
POWER IC board
LED board
SWITCH board
CONTROL board
Note:
The components identi-
fied by mark 0or dotted
linewithmark0arecriti-
cal for safety.
Replace only with part
number specified.
Note:
Lescomposantsidentifiéspar
une marque 0sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce portant le numéro
spécifié.
• Abbreviation
CND : Canadian model
SP : Singapore model
MX : Mexican model
MY : Malaysia model

44
SA-WM20
2-2. PRINTED WIRING BOARD
• See page 3 for Circuit Boards Location.
D101 A-2
D102 A-2
D103 A-2
D104 A-2
D301 B-3
D302 B-3
D303 C-5
D304 A-6
D401 A-7
D402 A-6
D403 A-4
D404 A-4
IC101 B-1
IC102 A-3
Q301 C-4
Q302 C-4
Q303 C-5
Q304 C-4
Q401 B-1
• Semiconductor
Location
Ref. No. Location
There are a few cases that the part isn’t mounted in
model is printed on diagram.

55
SA-WM20
2-3. SCHEMATIC DIAGRAM

66
SA-WM20
3-1. FRONT SECTION
SENTION 3
EXPLODEDVIEWS
3-2. AMP SECTION
SP101
not supplied
not supplied
1
2
3
4
56
6
8
7
12
7
7
9
12 10
11
11
F1
F2
T1
not supplied
not supplied
not supplied
51
52
53
54
54
54
55
56 57
54 54
54
57
60
6057
58
59 63
61
62
The components identified by
mark 0or dotted line with mark
0are critical for safety.
Replace only with part number
specified.
• Items marked “*” are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.
• The mechanical parts with no reference num-
ber in the exploded views are not supplied.
• Accessories and packing materials are given
in the last of the electrical parts list.
• Abbreviation
CND : Canadian model
SP : Singapore model
MX : Mexican model
MY : Malaysia model
NOTE:
• -XX and -X mean standardized parts, so they
may have some difference from the original
one.
• Color Indication of Appearance Parts
Example:
KNOB, BALANCE (WHITE) . . . (RED)
↑↑
Parts Color Cabinet's Color
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
1 X-4953-516-1 FRAME (BLACK) ASSY, GRILLE
(E,US,MX,CA,AEP,UK,MY,SP)
1 X-4953-686-1 FRAME (GRAY) ASSY, GRILLE (E,US,AEP,MY,SP)
2 4-232-524-01 PANEL, FRONT (SILVER)(E,US,AEP,MY,SP)
2 4-232-524-11 PANEL, FRONT (BLACK)
(E,US,MX,CA,AEP,UK,MY,SP)
3 1-680-714-12 PWB, CONTROL
4 4-232-527-01 KNOB, VOLUME (SILVER)(E,US,AEP,MY,SP)
4 4-232-527-11 KNOB, VOLUME (BLACK)
(E,US,MX,CA,AEP,UK,MY,SP)
5 4-232-531-01 PLATE, LIGHT GUIDE
6 4-973-938-81 KNOB (A), PUSH (SILVER)(E,US,AEP,MY,SP)
6 4-973-938-91 KNOB (A), PUSH (BLACK)
(E,US,MX,CA,AEP,UK,MY,SP)
7 7-685-649-79 SCREW +BVTP 3X14 TYPE2 IT-3
8 1-680-715-12 PWB, SWICH
9 1-680-716-12 PWB, LED
10 4-232-534-01 PACKING (DUCT)
11 4-914-430-11 SCREW (4X20), TAPPING
12 7-685-646-79 SCREW +BVTP 3X8 TYPE2 N-S
SP101 1-529-995-11 SPEAKER (20CM)
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
51 1-680-713-12 PWB, MAIN
52 A-4412-797-A CABINET ASSY(SILVER) (E,US,AEP,MY,SP)
52 A-4412-798-A CABINET ASSY(BLACK)
(E,US,MX,CA,AEP,UK,MY,SP)
*53 3-703-150-11 CLAMP (E,AEP,UK,MY,SP)
54 7-685-649-79 SCREW +BVTP 3X14 TYPE2 IT-3
55 1-680-717-12 PWB, POWER IC
56 4-234-079-11 PANEL, REAR (US,MX,CA)
56 4-234-079-41 PANEL, REAR (AEP,UK,MY,SP)
56 4-234-079-51 PANEL, REAR (E)
57 4-914-518-11 SCREW (4X14), (+) (B) TAPPING
58 1-777-071-11 CORD, POWER (AEP,UK)
58 1-783-525-11 CORD, POWER (TRACKING) (E)
58 1-783-820-11 CORD, POWER (US,MX,CA,MY,SP)
*59 3-703-244-00 BUSHING (2104), CORD
60 7-685-660-19 SCREW +BVTP 4X10 TYPE2 N-S
61 3-701-946-21 LABEL, FUSE RATING
62 4-234-637-01 CUSHION (TRANSFORMER)
63 4-956-370-02 BAND, PLUG FIXED (UK)
0F1 1-532-500-31 FUSE (T630mAL/250V)(AEP,UK,MY,SP)
0F1 1-532-502-31 FUSE (T1.25AL/250V)(E)
0F1 1-532-742-11 FUSE, GLASS CYLINDRICAL(DIA.5)
(1.6A/125V)(US,MX,CA)
0F2 1-532-499-31 FUSE (T400mAL/250V)(E)
0T1 1-435-879-11 TRANSFORMER, POWER (US,MX,CA)
0T1 1-435-880-11 TRANSFORMER, POWER (AEP,UK,MY,SP)
0T1 1-435-881-11 TRANSFORMER, POWER (E)
Les composants identifiés par une
marque 0sont critiques pour la
sécurité.
Ne les remplacer que par une piéce
portant le numéro spécifié.

7
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
SA-WM20
SECTION 4
ELECTRICAL PARTS LIST
1-680-714-12 PWB, CONTROL
*************
<CAPACITOR>
C203 1-136-173-00 MYLAR 0.47uF 5.00% 50V
C204 1-136-165-00 MYLAR 0.1uF 5.00% 50V
C205 1-126-963-11 ELECT 4.7uF 20.00% 50V
C207 1-126-963-11 ELECT 4.7uF 20.00% 50V
C208 1-104-664-11 ELECT 47uF 20.00% 25V
C209 1-104-664-11 ELECT 47uF 20.00% 25V
C210 1-126-965-11 ELECT 22uF 20.00% 50V
C211 1-126-965-11 ELECT 22uF 20.00% 50V
<CONNECTOR>
CN201 1-785-093-11 PIN, CONNECTOR 8P
<IC>
IC201 8-759-634-50 IC M5218AL
IC202 8-759-634-50 IC M5218AL
<RESISTOR>
R201 1-249-425-11 CARBON 4.7K 5% 1/4W F
R202 1-249-429-11 CARBON 10K 5% 1/4W
R203 1-249-425-11 CARBON 4.7K 5% 1/4W F
R204 1-249-425-11 CARBON 4.7K 5% 1/4W F
R205 1-249-429-11 CARBON 10K 5% 1/4W
R206 1-249-429-11 CARBON 10K 5% 1/4W
R207 1-249-429-11 CARBON 10K 5% 1/4W
R208 1-249-441-11 CARBON 100K 5% 1/4W
R209 1-247-807-31 CARBON 100 5% 1/4W
R214 1-247-887-00 CARBON 220K 5% 1/4W
R215 1-249-425-11 CARBON 4.7K 5% 1/4W F
<VARIABLE RESISTOR>
RV201 1-227-365-11 RES, VAR 20K/20K
RV202 1-227-364-11 RES, VAR 20K
<SWITCH>
S201 1-554-522-00 SWITCH, PUSH (1 KEY)
*************************************************************
1-680-716-12PWB, LED
********
<CONNECTOR>
*CN203 1-564-517-11 PLUG, CONNECTOR 2P
<DIODE>
D201 8-719-058-03 DIODE SEL5423E-TP15
*************************************************************
1-680-713-12 PWB, MAIN
**********
<CAPACITOR>
0C2 1-113-924-11 CERAMIC 0.0047uF 20.00% 250V
C101 1-126-964-11 ELECT 10uF 20.00% 50V
C103 1-136-165-00 MYLAR 0.1uF 5.00% 50V
C104 1-136-165-00 MYLAR 0.1uF 5.00% 50V
C301 1-136-165-00 MYLAR 0.1uF 5.00% 50V
C303 1-126-933-11 ELECT 100uF 20.00% 16V
C304 1-136-153-00 FILM 0.01uF 5% 50V
C305 1-126-967-11 ELECT 47uF 20.00% 50V
C306 1-126-967-11 ELECT 47uF 20.00% 50V
C307 1-136-169-00 MYLAR 0.22uF 5.00% 50V
C308 1-136-169-00 MYLAR 0.22uF 5.00% 50V
C309 1-126-934-11 ELECT 220uF 20.00% 10V
C310 1-126-949-11 ELECT 220uF 20.00% 35V
C311 1-126-963-11 ELECT 4.7uF 20.00% 50V
C312 1-126-964-11 ELECT 10uF 20.00% 50V
C320 1-102-110-00 CERAMIC 0.00022uF 10.00% 50V
C401 1-136-165-00 MYLAR 0.1uF 5.00% 50V
C402 1-136-165-00 MYLAR 0.1uF 5.00% 50V
C403 1-126-974-11 ELECT 3300uF 20.00% 50V
C404 1-126-974-11 ELECT 3300uF 20.00% 50V
C405 1-104-665-11 ELECT 100uF 20.00% 25V
C406 1-104-665-11 ELECT 100uF 20.00% 25V
<CONNECTOR>
CN1 1-564-321-00 PIN, CONNECTOR 2P
*CN2 1-580-230-11 PIN, CONNECTOR (PC BOARD) 2P
CN101 1-785-093-11 PIN, CONNECTOR 8P
*CN301 1-565-792-11 PIN, CONNECTOR 2P
<DIODE>
D101 8-719-991-33 DIODE 1SS133T-77
D102 8-719-991-33 DIODE 1SS133T-77
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
NOTE:
• Due to standardization, replacements in the
parts list may be different from the parts
specified in the diagrams or the components
used on the set.
• -XX, -X mean standardized parts, so they
may have some difference from the original
one.
• Items marked “*” are not stocked since they
are seldom required for routine service.
Some delay should be anticipated when
ordering these items.
• CAPACITORS:
uF: µF
• RESISTORS
All resistors are in ohms.
METAL: metal-film resistor
METAL OXIDE: Metal Oxide-film resistor
F: nonflammable
• COILS
uH: µH
• SEMICONDUCTORS
In each case, u: µ, for example:
uA...: µA... , uPA... , µPA... ,
uPB... , µPB... , uPC... , µPC... ,
uPD..., µPD...
• Abbreviation
CND : Canadian model
SP : Singapore model
MX : Mexican model
MY : Malaysia model
When indicating parts by reference number,
please include the board name.
CONTROL MAIN
The components identified by
mark 0or dotted line with mark
0are critical for safety.
Replace only with part number
specified.
Les composants identifiés par une
marque 0sont critiques pour la
sécurité.
Ne les remplacer que par une piéce
portant le numéro spécifié.
LED

8
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
SA-WM20
D103 8-719-991-33 DIODE 1SS133T-77
D104 8-719-991-33 DIODE 1SS133T-77
D301 8-719-991-33 DIODE 1SS133T-77
D302 8-719-991-33 DIODE 1SS133T-77
D303 8-719-991-33 DIODE 1SS133T-77
D304 8-719-991-33 DIODE 1SS133T-77
D401 8-719-500-56 DIODE D3SBA20
D402 8-719-991-33 DIODE 1SS133T-77
D403 8-719-947-61 DIODE MTZJ-T-72-15B
D404 8-719-947-61 DIODE MTZJ-T-72-15B
<FUSE>
0F1 1-532-500-31 FUSE (T630mAL/250V)(AEP,UK,MY,SP)
0F1 1-532-502-31 FUSE (T1.25AL/250V)(E)
0F1 1-532-742-11 FUSE, GLASS CYLINDRICAL (DIA.5)
(1.6A/125V)(US,MX,CA)
0F2 1-532-499-31 FUSE (T400mAL/250V)(E)
<IC>
IC101 8-759-634-50 IC M5218AL
IC102 8-759-634-50 IC M5218AL
<JACK>
J103 1-770-377-31 JACK, PIN 1P (LINE)(E)
J103 1-793-446-11 JACK, PIN 1P (LINE)(US,MX,CA,AEP,UK,MY,SP)
<TRANSISTOR>
Q301 8-729-029-86 TRANSISTOR DTC124ESA
Q302 8-729-119-78 TRANSISTOR 2SC2785-HFE
Q303 8-729-178-42 TRANSISTOR 2SC2784-F
Q304 8-729-119-78 TRANSISTOR 2SC2785-HFE
Q401 8-729-029-66 TRANSISTOR DTC114ESA
<RESISTOR>
R101 1-249-441-11 CARBON 100K 5% 1/4W
R102 1-249-441-11 CARBON 100K 5% 1/4W
R103 1-249-425-11 CARBON 4.7K 5% 1/4W F
R105 1-249-441-11 CARBON 100K 5% 1/4W
R106 1-249-441-11 CARBON 100K 5% 1/4W
R107 1-249-425-11 CARBON 4.7K 5% 1/4W F
R109 1-249-425-11 CARBON 4.7K 5% 1/4W F
R110 1-249-441-11 CARBON 100K 5% 1/4W
R111 1-249-429-11 CARBON 10K 5% 1/4W
R114 1-247-887-00 CARBON 220K 5% 1/4W
R115 1-249-441-11 CARBON 100K 5% 1/4W
R116 1-249-429-11 CARBON 10K 5% 1/4W
R117 1-247-895-00 CARBON 470K 5% 1/4W
R118 1-249-425-11 CARBON 4.7K 5% 1/4W F
R120 1-249-425-11 CARBON 4.7K 5% 1/4W F
R121 1-249-425-11 CARBON 4.7K 5% 1/4W F
R122 1-249-425-11 CARBON 4.7K 5% 1/4W F
R123 1-249-425-11 CARBON 4.7K 5% 1/4W F
R301 1-249-425-11 CARBON 4.7K 5% 1/4W F
R302 1-249-433-11 CARBON 22K 5% 1/4W
R303 1-249-411-11 CARBON 330 5% 1/4W
R304 1-249-433-11 CARBON 22K 5% 1/4W
R305 1-249-435-11 CARBON 33K 5% 1/4W
R307 1-249-385-11 CARBON 2.2 5% 1/6W F
R308 1-215-868-00 METAL OXIDE 680 5% 1W
R309 1-249-433-11 CARBON 22K 5% 1/4W
R310 1-249-433-11 CARBON 22K 5% 1/4W
R311 1-249-441-11 CARBON 100K 5% 1/4W
R312 1-249-441-11 CARBON 100K 5% 1/4W
R313 1-249-437-11 CARBON 47K 5% 1/4W
R314 1-249-430-11 CARBON 12K 5% 1/4W
R401 1-215-892-11 METAL OXIDE 1K 5% 2W
R402 1-215-892-11 METAL OXIDE 1K 5% 2W
R405 1-249-429-11 CARBON 10K 5% 1/4W
R406 1-215-894-11 METAL OXIDE 2.2K 5% 2W
<RELAY>
RY301 1-515-920-11 RELAY (24V)
<SWITCH>
0S2 1-762-953-11 SWITCH, POWER (VOLTAGE SELECTOR)(E)
<TERMINAL>
TM101 1-537-922-11 TERMINAL BOARD (SPEAKER)
*************************************************************
1-680-715-12 PWB, SWITCH
************
<CAPACITOR>
0C1 1-113-924-11 CERAMIC 0.0047uF 20.00% 250V
<CONNECTOR>
*CN3 1-564-321-11 PIN, CONNECTOR 2P
<SWITCH>
0S1 1-554-920-11 SWITCH, PUSH (AC POWER)(1 KEY)(@/1)
*************************************************************
1-680-717-12 PWB, POWER IC
**************
<CAPACITOR>
C302 1-162-286-31 CERAMIC 220PF 10% 50V
<CONNECTOR>
CN303 1-785-088-11 PIN, CONNECTOR 6P
<IC>
IC301 8-759-299-54 IC LM3886TF
<RESISTOR>
R306 1-249-435-11 CARBON 33K 5% 1/4W
*************************************************************
SWITCH
MAIN POWER IC
The components identified by mark 0or
dotted line with mark 0are critical for
safety.
Replace only with part number specified.
Les composants identifiés par une marque
0sont critiques pour la sécurité.
Ne les remplacer que par une piéce portant
le numéro spécifié.

9
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
SA-WM20
MISCELLANEOUS
**************
0T1 1-435-879-11 TRANSFORMER, POWER (US,MX,CA)
0T1 1-435-880-11 TRANSFORMER, POWER (AEP,UK,MY,SP)
0T1 1-435-881-11 TRANSFORMER, POWER (E)
*************************************************************
ACCESSORIES & PACKING MATERIALS
*******************************
1-770-019-11 ADAPTOR, CONVERSION PLUG 3P (UK)
1-769-329-21 CORD, CONNECTION (PIN-PIN)
1-769-433-21 CORD, SPEAKER
4-233-869-11 MANUAL, INSTRUCTION
(ENGLISH,FRENCH)(US,CND,UK)
4-233-869-21 MANUAL, INSTRUCTION
(ENGLISH,FRENCH,GERMAN,ITALIAN)(AEP)
4-233-869-31 MANUAL, INSTRUCTION
(DUTCH,SPANISH,SWEDISH,POLISH)(AEP)
4-233-869-41 MANUAL, INSTRUCTION
(PORTUGUESE,DANISH,FINNISH,RUSSIAN)
(AEP)
4-233-869-51 MANUAL, INSTRUCTION
(ENGLISH,FRENCH,SPANISH,CHINESE)
(E,MX,MY,SP)
4-235-237-01 FOOT
The components identified by mark 0or
dotted line with mark 0are critical for
safety.
Replace only with part number specified.
Les composants identifiés par une marque
0sont critiques pour la sécurité.
Ne les remplacer que par une piéce portant
le numéro spécifié.

10
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
SA-WM20
REVISION HISTORY
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Ver. Date Description of Revision
1.0 2001.01 New