Sony SRS-T70 Service Manual page 5

AMP BOARD, JACK BOARD
Note: When mounting the AMP board,
align the position of switch (S1)
and the switch knob.
S1
3 AMP board
2 two screws
(P2 × 5)
1 Remove four solders
of speaker unit
(SP1/SP2) leads.
1 Remove three solders
of cord (with plug).
1 Disconnect three soldered lead wire,
two (yellow, brown) from the JACK board
and one (red) from plus battery spring.
(For the colors of lead wires and
"PRECAUTION ON ROUTING THE LEAD WIRES",
see the following figure.)
PRECAUTION ON ROUTING THE LEAD WIRES
Note: The lead wires could be pinched between front case
and rear case, resulting in cut-off.
lead wire
(speaker unit (SP2)
(R ch) y AMP board)
AMP board
NATURAL
GRN
RED
lead wire
(speaker unit
(SP1) (L ch)
WHT
y AMP board)
rear case
lead wire (brown)
(AMP board y JACK board)
switch knob
3 JACK board
1 Disconnect three solders lead wire,
two (yellow, brown) from the AMP board
2 two screws
and one (black) from minus battery spring.
(P2 × 5)
(For the colors of lead wires and
"PRECAUTION ON ROUTING THE LEAD WIRES",
see the following figure.)
lead wire (red)
(AMP board y plus battery spring)
NATURAL
lead wire (yellow)
RED
(AMP board y JACK board)
BLK
JACK board
cord (with plug)
lead wire
(JACK board y
Note: Put a knot of the cord
minus battery spring)
(with plug) into a
groove of rear case.
– 5 –
3-1. BLOCK DIAGRAM
POWER AMP
IC1
P1
(LINE INPUT)
IN1+
POWER OUT1
12
AMP
MUTING
Q1
IN2+ POWER OUT2
9
AMP
POWER AMP
IC2
IN1+ POWER OUT1
12
AMP
MUTING
Q2
IN2+ OUT2
POWER
9
AMP
• SIGNAL PATH
: LINE INPUT
05
SECTION 3
DIAGRAMS
S1
POWER
OFF/DIRECT
ON
S1 (1/4)
SP1
19
(L-CH)
2
S1 (2/4)
SP2
S1 (3/4)
(R-CH)
19
B+
2 D2
POWER
+ +
S1 (4/4)
– 6 –
SRS-T70
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6)
4PCS. 6V
JK1
DC IN 9V
!