SERVICE MANUAL
ACTIVE SUBWOOFER
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
SPECIFICATIONS
SA-WM40
Ver 1.2 2002.09
9-929-065-12
Sony Corporation
2002I0500-1
Home Audio Company
C
2002.09
Published by Sony Engineering Corporation
2
MODEL IDENTIFICATION
Rear View
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0
SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COM-
POSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED
LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS
AND IN THE 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 PUB-
LISHED BY SONY.
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety check 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 TEST
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" indica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are suit-
able. (See Fig. A)
Fig. A.
Using an AC voltmeter to check AC leakage.
1.5 k
0.15
µF
AC
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
with this indication
: US, Canadian models
without this indication : Except US, Canadian models
3
3
SECTION 1
GENERAL
SECTION 2
DIAGRAMS
· Location of controls
Front View (a part)
Upper View (a part)
Rear View (a part)
2-1.
NOTE FOR PRINTED WIRING BOARD AND SCHEMATIC DIAGRAM
· Circuit Boards Location
CONTROL board
POWER SW UC board
PS board
POWER TR board
MAIN board
Note on Schematic Diagram:
· 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
and 1/4 W or less unless otherwise
specified.
· C : panel designation.
· U : B+ Line.
· V : B Line.
· Voltages are dc with respect to ground under no-signal
conditions.
no mark : Power on
(
) : Automatic power off
: Impossible to measure
· Voltages are taken with a VOM (Input impedance 10 M
).
Voltage variations may be noted due to normal produc-
tion tolerances.
· Signal path.
F
: AUDIO
· Abbreviation
AUS
: Australian model
CND : Canadian model
Note:
The components identi-
fied by mark 0 or dotted
line with mark 0 are criti-
cal for safety.
Replace only with part
number specified.
Note:
Les composants identifiés par
une marque 0 sont critiques
pour la sécurité.
Ne les remplacer que par une
pièce por tant le numéro
spécifié.
Note on Printed Wiring Boards:
· X : parts extracted from the component side.
· Y : parts extracted from the component side.
· b : Pattern from the side which enables seeing.
4
4
SA-WM40
· Semiconductor
Location
Ref. No.
Location
D501
B-3
D502
B-3
D503
D-3
D504
C-2
D505
D-3
D506
C-2
D507
B-8
D508
B-8
D509
F-3
D510
F-2
D511
B-11
D512
D-11
D601
F-4
D602
F-4
D605
G-4
D606
H-2
D801
I-3
D802
I-3
D803
I-2
D804
I-2
D810
H-12
D817
B-4
D818
B-4
D819
B-5
D820
B-5
D821
C-4
D822
C-5
IC501
C-3
IC502
B-3
IC503
B-7
IC504
C-8
IC505
E-3
IC506
B-8
IC507
D-4
IC508
C-8
Q503
F-2
Q504
F-3
Q505
E-3
Q507
B-11
Q508
C-11
Q601
E-4
Q602
E-4
Q603
F-4
Q604
E-4
Q605
E-4
Q606
F-4
Q607
E-8
Q608
F-3
Q609
E-9
Q610
E-7
Q611
G-4
Q612
G-4
Q613
G-3
Q614
G-4
Q801
C-4
Q802
C-5
MAIN BOARD
CONTROL BOARD
POWER TR BOARD
PS BOARD
POWER SW UC
BOARD
JK501
IN
L
OUT
LINE
TM501
IN
OUT
SPEAKER
+
+
+
+
R
SW502
POWER SAVE
AUTO
OFF
(CHASSIS)
SP601
1-677-924-
(11)
11
RLY601
1-677-927-
(11)
11
13
13
VR501
LEVEL
SW501
PHASE
VR502
1
5
CUT OFF FREQ
D512, S801
POWER
31
NORMAL
REVERSE
1-677-925-
(11)
11
1-677-933-
(11)
11
AC IN
T801
POWER TRANSFORMER
T851
POWER TRANSFORMER
1-677-926-
(11)
11
1
A
2
3
4
5
6
7
8
9
10
11
12
B
C
D
E
F
G
H
I
1
2
2-2.
PRINTED WIRING BOARDS (US, Canadian models)
· See page 3 for Note on Printed Wiring Boards. · See page 3 for Circuit Boards Location.
Ver 1.2
5
5
SA-WM40
2-3.
SCHEMATIC DIAGRAM (US, Canadian models)
· See page 3 for Note on Schematic Diagram.
The components identified by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part number specified.
Les composants identifiés par une marque 0 sont
critiques pour la sécurité.
Ne les remplacer que
par une pièce portant le numéro spécifié.
Ver 1.2