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1-2.
CIRCUIT DESCRIPTION
(See Fig. 1)
Program Sensor
When
the band
selector switch (S1) and FUNC-
TION switch (S2) are set to PROGRAM
position and
band
selector position
respectively
and the pointer
matches with a station marker, FM or LW station is
automatically
selected
through
optical
detection.
(Fig. 2)
1) When
the
pointer
matches
only
with
the
.FM
station marker:
b) The collecter voltage of Q402 reduces and D401
is turned on.
c) The terminal @3) of IC201 is grounded through
D201, R204, D401, Q402 and D403.
d) FM circuit operates (The terminal Q3) of IC201
serves as a switch).
Note:
When B + voltage is applied to the terminal
Q3) of IC201 through R401, R204 and
D201, the receiver is in AM mode. At the
same
time,
as Q403
is on,
PL401
(FM
indicator lamp) lights.
2) When
the
pointer
matches
only
with
the
LW
station marker:
a) As the light of IC401 is not intercepted, Q402
and D401 are turned off. As a result, B + voltage
is applied to the terminal Q3) of IC201 through
R401
and R204. On the other hand, the light
of IC402
is intercepted
by the
LW
station
marker,
b) Q404 and Q405 are turned on.
c) B + voltage is applied to L306
(LW oscillator
coil).
d) LW circuit operates. When Q405 is on, PL402
(LW indicator lamp) simultaneously lights.
(C201
TERMINAL (23)
020!
R204
R40)
L306
(Lw osc)"
STR-313L
10401
FM
station
marker
The light is
3 ain tercepted
sp:
by this portion.
LW station
marker
pointer
'C€402
Fig. 2
Q202 and 401
(C202
TERMINAL(IS)
Q202
i)
Rac2= ——- R403
(SENSOR BOARD J
Fig. 7
a,
a
PL401 {FM}
Fey
0406
RANG
PLaoe LW] paar
sl
Zrais so(RUNCTIR] S"BANO SELECTOR}
TAPE
Lw
'
;
PROGRAM
@ AND
= SOR
SELECTOR,
MW
PHONO
sly
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