Sony SA-VE312 Service Manual page 3

1-1. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
Note on Printed Wiring Board:
• X : parts extracted from the component side.
• b : Pattern from the side which enables seeing.
• Indication of transistor.
Q
B C E
These are omitted.
• Circuit Boards Location
SA-WMS315
POWER SWITCH board
LED board
CONTROL board
SECTION 1
DIAGRAMS
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 / W or less unless otherwise
4
specified.
• 2 : nonflammable resistor.
• C : panel designation.
Note:
Note:
Les composants identifiés par
The components identi-
fied by mark 0 or dotted une marque 0 sont critiques
line with mark 0 are criti- pour la sécurité.
cal for safety. Ne les remplacer que par une
Replace only with part piéce por tant le numéro
spécifié.
number specified.
• U : B+ Line.
• V : B– Line.
• Voltages are dc with respect to ground under no-signal
conditions.
no mark : AUDIO
• Voltages are taken with a VOM (input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Abbreviation
CND : Canadian model
POWER board
MAIN board
• IC Block Diagrams
IC302 uPC1237H
OVER LOAD DET
OFFSET DET
LATCH/
AUTORESET
1 2 3
IC301 STK350-230
TR1
INPUT 1 TR2
NF 2
3
4
-VEOUT 5
+VEOUT
6
R4
TR5
7
V SS
GND
8
D1 D2 R5
V 9
CC
R9
TR8
3 3
V ON
CC
F/F
MUTE
AC OFF
DET
V
CC
4 5 6 7 8
TR3 R1
TR4
R2
R6
TR7
TR6
R3
D4 D3
R8 R7