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R-212M 14
Control Unit
Control unit consists of LSI, power source circuit, synchro-
nizing signal circuit, ACL circuit, buzzer circuit, encoder
circuit and indicator circuit.
Control unit consists of LSI, power source circuit, synchro-
nizing signal circuit, ACL circuit, buzzer circuit, encoder
circuit and indicator circuit.
1) LSI
This LSI controls the encoder signal, tact switch strobe
signal, relay driving signal for oven function, buzzer
signal and LED signal.
signal, relay driving signal for oven function, buzzer
signal and LED signal.
2) Power Source Circuit
This circuit generates voltage necessary in the control
unit.
unit.
Symbol
Voltage
Application
VC
-5.0V
LSI(I-1)
VR
-12.0V
RELAY(RY1,2)
3) Synchronizing Signal Circuit
The power source synchronizing signal is available in
order to compose a basic standard time in the clock
circuit. It accompanies a very small error because it
works on commercial frequency.
order to compose a basic standard time in the clock
circuit. It accompanies a very small error because it
works on commercial frequency.
4) ACL
A circuit to generate a signals which resets the LSI to
the initial state when power is supplied.
the initial state when power is supplied.
5) Buzzer Circuit
The buzzer is responsive to signals from the LSI to emit
audible sounds (tact switch touch sound and comple-
tion sound).
audible sounds (tact switch touch sound and comple-
tion sound).
6) Door Sensing Switch (Stop Switch)
A switch to "tell" the LSI if the door is open or closed.
7) Relay Circuit
To drive the magnetron, fan motor, turntable motor and
light the oven lamp.
light the oven lamp.
8) Encoder
The encoder generates the pulse signal, and the pulse
signal is sent to the LSI.
signal is sent to the LSI.
9) Indicator Circuit
Indicator elements are the Light-emitting diodes (LD1-
LD24 and LD30-LD34).
This circuit consists of 4-digits and 8 segments.
LD24 and LD30-LD34).
This circuit consists of 4-digits and 8 segments.
10) Tact Switch
Signal generated in the LSI is sent to the tact switch.
When a tact switch is touched, a signal is completed
through the tact switch and passed back to the LSI
through to perform the function that was requested.
When a tact switch is touched, a signal is completed
through the tact switch and passed back to the LSI
through to perform the function that was requested.
CONTROL PANEL ASSEMBLY
OUTLINE OF CONTROL PANEL
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