Read Sony SRS-T77 Service Manual 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
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