Sony SA-WM40 Service manual
SA-WM40
SERVICE MANUAL
Ver 1.1 2001.01
With SUPPLEMENT-1
(9-929-065-81)
SPECIFICATIONS
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
ACTIVE SUBWOOFER
SAFETY CHECK-OUT
s
After correcting the original service problem, perform the following 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. Follo w the manufacturers’ instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Pr ecision 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 lowvoltage 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 2 V A C range are suitable. (See Fig. A)
To Exposed Metal
Parts on Set
MODEL IDENTIFICATION
– Rear View –
1.5 k
0.15 µF
Fig. A. Using an AC voltmeter to check AC leakage.
Ω
Earth Ground
AC
voltmeter
(0.75 V)
with this indication : US, Canadian models
without this indication : Except US, Canadian model
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED
LINE WITH MARK 0 ON THE SCHEMATIC DIA GRAMS
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 PUBLISHED BY SONY.
2
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE 0
SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
SECTION 1
d
GENERAL
SECTION 2
DIAGRAMS
• Location of controls
– Front View (a part) –
– Upper View (a part) –
2-1. NOTE FOR PRINTED WIRING BOARD AND SCHEMATIC DIAGRAM
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.
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 Ω and 1/
specified.
• C : panel designation.
Note:
The components identified by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part
number specified.
• U : B+ Line.
• V : B– Line.
• Voltages are dc with respect to ground under no-signal
conditions.
no mark : Power on
( ) : Automatic power off
• Voltages are taken with a V OM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production tolerances.
• Signal path.
F : AUDIO
• Abbreviation
AUS : Australian model
CND : Canadian model
: Impossible to measure
∗
4
W or less unless otherwise
Note:
Les composants identifiés par
une marque 0 sont critiques
pour la sécurité.
Ne les remplacer que par une
pièce portant le numéro
spécifié.
– Rear View (a part) –
• Circuit Boards Location
MAIN board
CONTROL board
POWER TR boar
PS board
POWER SW UC board
33
SA-WM40
2-2. PRINTED WIRING BOARDS • See page 3 for Note on Printed Wiring Boards. • See page 3 for Circuit Boards Location.
• 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
1
A
IN
JK501
LINE
OUT
B
2 3 4 5 6 7 8 9 10 11 12
CONTROL BOARD
MAIN BOARD
VR501
LEVEL
31
SW501
PHASE
NORMAL REVERSE
VR502
CUT OFF FREQ
15
POWER SW UC
BOARD
11
C
TM501
SPEAKER
OUT
IN
D
L
E
R
++
––
––
++
POWER TR BOARD
1-677-925-
1313
(11)
1-677-927-
11
(11)
D512, S801
POWER
–1–2
1-677-933-
11
(11)
F
T851
RLY601
SW502
G
POWER SAVE
AUTO
OFF
PS BOARD
T801
POWER TRANSFORMER
POWER TRANSFORMER
H
(CHASSIS)
SP601
1-677-926-
I
1-677-924-
05
11
(11)
AC IN
11
(11)
44
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