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-R-9360
BUZZER
CIRCUIT
The square
waveform
developed
from
T terminal
of LSI is ap-
waveform
voltage
(2.5 kHz) is applied
to SP 1 to generate
buz-
plied
to the
base
of Q6 to turn
on and
off
06,
and
square
zer sound.
L ---------
i
----<T
(From LSI)
VF2
(-22V)
T
se1
~l-n-~-
1 I
-l
I I
200usec.
2OOusec.
.
r\
Figure
T-6.
Buzzer
Circuit
RELAY
CIRCUIT
GND
-22v
GND
While
the unit is cooking,
a "H"
level signal
is produced
at D8
terminal
of LSI and also a pulse
signal
at D9 terminal
of LSI.
The pulse signal from
D9 terminal
is applied
to the rectifier
cir-
cuit made up of D82 and D83
where
it is made
into DC signal
to charge
C81.
With
C81
charged
up, Q4 and 03
turn
on in
succession
so that
a current
il is made
to turn
on the
control
relay
(RY-1).
The "H"
level signal
from
D8 terminal
is applied
to Q2 which
is connected
in series
with
Q3,
and current
i2 is made
only
when
both
02
and Q3 are turned
on allowing
the cook
relay
(RY-2)
to turn
on.
240V
50Hz
Figure T-7.
Relay Circuit
35
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