Read Sony SRS-A57 / SRS-PC57 Service Manual online
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SRS-A57
2-2. SCHEMATIC DIAGRAM
2-1. PRINTED WIRING BOARDS
Note:
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
U
: B+ Line.
• Power voltage is dc 15V and fed with regulated dc power
supply from external power voltage jack.
• Voltages are dc with respect to ground under no-signal
conditions.
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Signal path.
F
Note:
• X
: parts extracted from the component side.
• b
: Pattern on the side which is seen.
D1
B-3
D2
B-3
D4
A-2
Ref. No.
Location
z
Semiconductor Location
Ref. No.
Location
IC1
C-4
Q1
B-2
Q2
B-2
SECTION 2
DIAGRAMS
02
2
3
4
A
1
B
C
D
E
11
(11)
1-675-921-
[RH BOARD]
SW1
-1
-2
SW1
POWER
OFF
R
ON
D4
POWER
D4
R16
R23
R14
R4
R3
R20
R5
R6
R9
R7
R8
R10
R15
R22
R12
R11
R13
R2
R1
R21
JW4
C1
C2
C7
C4
C3
C8
C5
C6
D1
D2
B
C
E
Q2
B
C
E
Q1
C25
C13
C12
C15
C16
C19
C20
C21
C18
C17
C26
C27
R19
R18
R17
C10
C9
C22
C23
10
1
5
IC1
RV1
VOLUME
RV1-2
RV1-1
JW1
JW6
JW2
C11
FU1
US MODEL
EXCEPT
US MODEL
US MODEL
DC IN 15V
JK1
L1
JK2
R OUT
SP1
SPEAKER
(L-CH)
–
+
+ –
RED
WHT
RED
WHT
BLK
P1
(INPUT)
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