Sony SRS-T77 Service Manual ▷ View online
SRS-T77
5
5
SECTION 3
DIAGRAMS
3-1.
BLOCK DIAGRAM
2-4.
AMP BOARD, JACK BOARD
2-5.
DRAW AROUND LEAD WIRES
2
two screws
(P2
(P2
×
5)
3
AMP board
S1
knob, switch
1
Remove four solders of lead
from speaker unit (SP1/SP2).
from speaker unit (SP1/SP2).
1
Remove two solders of lead (yellow, brown)
from jack board and solder of lead (red)
from “spring, plug battery”.
from jack board and solder of lead (red)
from “spring, plug battery”.
4
Remove two solders of lead (yellow, brown)
from AMP board and solder of lead (black)
from “spring, minus battery”.
from AMP board and solder of lead (black)
from “spring, minus battery”.
4
Remove solder
of lead.
of lead.
6
jack board
1
Remove three solders of cord (with plug).
1
Remove solder of lead.
5
two screws
(P2
(P2
×
5)
Note 3: When installation AMP board,
fit switch (S1) and “knob, switch”.
Note 1: When installation leads and assembling set,
refer to DRAW AROUND LEAD WIRE.
Note 2: It is not necessary to remove AMP board
to remove jack board.
– +
Note 1: It is possible that lead wire are caught between the “case, front” and “case, rear” and cut.
Draw around lead wires as shown in the figure.
Note 2: Put the knot of the cord (with plug)
in the groove of “case, rear”.
lead wire
(speaker unit (SP2) (R ch)
-AMP board)
(speaker unit (SP2) (R ch)
-AMP board)
lead wire
(speaker unit (SP1) (L ch)
-AMP board)
(speaker unit (SP1) (L ch)
-AMP board)
lead wire (red)
(AMP board-“spring, plus battery”)
(AMP board-“spring, plus battery”)
lead wire (yellow)
(AMP board-jack board)
(AMP board-jack board)
lead wire (blown)
(AMP board-jack board)
(AMP board-jack board)
lead wire (black)
(jack board-“spring, minus battery”)
(jack board-“spring, minus battery”)
cord (with plug)
“case, rear”
lead wire
(AMP board condenser (C22) minus side
-jack board)
(AMP board condenser (C22) minus side
-jack board)
jack board
AMP board
red
natural color
natural color
natural color
red
green
green
•
SIGNAL PATH
: LINE INPUT
S1 (1/4)
S1 (2/4)
S1 (3/4)
S1 (4/4)
B+
SP1
(L-CH)
SP2
(R-CH)
P1
(LINE INPUT)
POWER AMP
IC1
OUT1
IN1+
POWER
AMP
19
12
OUT2
IN2+
POWER
AMP
MUTING
Q1
MUTING
Q2
2
9
POWER AMP
IC2
OUT1
IN1+
POWER
AMP
19
12
OUT2
IN2+
POWER
AMP
2
9
+
+
JK1
DC IN 9V
!
DRY BATTERY
SIZE “AA”
(IEC DESIGNATION R6)
4PCS. 6V
D2
POWER
S1
POWER
OFF/DIRECT
ON
LIMITER
Q3
SRS-T77
6
6
SP1
(L-CH)
+
–
AMP BOARD
(CONDUCTOR SIDE)
1-680-334-
(11)
11
-1
-2
-3
-4
S1
POWER
OFF/
DIRECT
ON
t
SP2
(R-CH)
P1
(LINE INPUT)
+
–
C22
+
GRN
RED
NATURAL
RED
YEL
BRN
DRY BATTRY
SIZE “AA”
(IEC DESIGNATION R6)
4PCS. 6V
B
C
E
Q1
B
C
E
Q2
C15
+
C4
+
C14
+
C6
+
C13
+
C5
+
C7
+
C9
+
C8
+
C3
+
C16
+
C17
+
C12
+
C10
+
C11
+
D2
D1
D3
R13
R14
R18
R17
R16
R15
R11
C103
C1
R7
R9
R3
R5
R1
C24
C101
R19
C20
C18
R20
C25
C23
C21
C19
R2
C102
R4
C104
R12
R10
R8
R6
C2
C26
IC2
IC1
AMP BOARD
(COMPONENT SIDE)
(11)
11
1-680-334-
A
K
A
K
POWER
20
11
1
10
11
10
20
1
R21
R22
JACK BOARD
(COMPONENT SIDE)
(11)
11
1-680-335-
JACK BOARD
(CONDUCTOR SIDE)
(11)
11
1-680-335-
Q3
JK1
DC IN 9V
–
+
BLK
YEL
BRN
A
B
C
D
E
1
2
3
4
5
6
7
8
3-2.
PRINTED WIRING BOARDS
Note on Printed Wiring Boards:
•
•
X
: parts extracted from the component side.
•
Y
: parts extracted from the conductor side.
•
z
: Through hole.
•
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side:
Pattern face side:
Parts on the pattern face side seen from
(Conductor Side)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Component Side) the parts face are indicated.
• Semiconductor
Location
Ref. No.
Location
D1
A-1
D2
B-1
D3
B-1
IC1
B-5
IC2
B-3
Q1
A-3
Q2
A-2
Q3
D-7
SRS-T77
7
7
3-3.
SCHEMATIC DIAGRAM
Note on Schematic Diagram:
• 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.
•
C
: panel designation.
• IC Block Diagram
IC1, 2
TEA2025D-013TR
20
19
18
17 16 15 14
11
+
–
13 12
+
–
THERMAL
PROTECT
START
CIRCUIT
10
9
8
7
6
5
4
3
2
1
DECOUPLING
VCC
OUT 1
BOOT 1
GND
GND
GND
GND
FEEDBACK
IN1 (+)
GND (SUB
)
BRIDGE
OUT 2
BOOT 2
GND
GND
GND
GND
FEEDBACK
IN2 (+)
SVR
•
A
: B+ Line.
• Power voltage is dc 9 V and fed with regulated dc power
supply from external power voltage jack.
• Voltages are dc with respect to ground under no-signal
conditions.
no mark : POWER ON
no mark : POWER ON
• 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
: LINE INPUT
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