Sony TC-366 - Page 49

SON Y:
SERVICE MANUAL
SUPPLEMENT eee
SUBJECT: PRODUCTION CHANGE OF POWER SUPPLY CIRCUIT BOARD
APPLICABLE SERIAL NO.: 37,171 and later (GENERAL EXPORT MODEL)
35,261 and later (USA MODEL)
1. The following parts are changed. See Fig. 1. The former and new parts are noninterchangeable.
CHANGED (Electrical Parts):
Ref. No. Description Part No.
[Former _| 28D28 8-720-286-70
Q303 New 2SC1014 1-801-002-13
r Former maa [_1-539-390-12
a power supply circuit board, without components 1-539-390-21
Former hs) . X-34720-54-1
[New | ~—~Power supply circuit board, with components X-34720-54-2
CHANGED (Mechanical Part):
Description Former New
leg, power supply circuit board holding 3-472-230 3-472-308
Gorsxs
OD sw39
power
supply
circuit
board
O-w3¢
@OP3x6
O33
S—-w3¢
@®B2x 10
BN: @P3x6
& re SwW3o
leg, power supply circuit bushing
board holding ey power supply circuit board
“Sea
leg,
power
supply
circuit
DB
board
holding
—- AN?
_ Spacer, mytar | \ _ Sheet, mylar (included in
e transistor 2SC1014)
_@
\
Sf2
¢
transistor, 2SD28 ~.. fo transistor, 2SC1014 —
G
oe iy
bushing
—— ae
ee call S2 P3x6 QP3x6
a
—
yy,
ae SS
oh)
a ¢
side plate (B) ass‘y, amp chassis |
w3o
side plate (B) ass’y, amp chassis
\ oe
w36 La
A-\
before change after change
Fig. 7 Transistor change
2.
R302
(1002)
is
remounted
on
the
power
supply
circuit
board
from
the
bias
oscillator
circuit
board,
to
prevent
Q304
from
damage
caused
when
B+
circuit
of
the
bias
oscillator
board
is
short-circuited.
See
Figs.
2
and
3.
bias oscillator circuit board
Q303 2801014
xe
R302 100
Semiconductor electrode
Power supply circuit board
R302 is remounted.
Fig. 2. Schematic diagram
To Blos OSC
Circult Boord
To Playback Amp,
Cwrcult Board, Gai
To S301
{BIAS SW)
conductor side component side
Fig. 3 Power supply circuit board
SONY CORPORATION
110657 -3 23. DO Printed in Japan