16
R-200BK
R-200BW
CONTROL PANEL ASSEMBLY
OUTLINE OF CONTROL PANEL
4) ACL
A circuit to generate a signals which resets the LSI to the
initial state when power is supplied.
5) Buzzer Circuit
The buzzer is responsive to signals from the LSI to emit
audible sounds (completion 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.
8) Encoder
The encoder generates the pulse signal, and the pulse
signal is sent to the LSI.
9) Indicator Circuit
Indicator elements are the Light-emitting diodes (LD1-
LD20).
This circuit consists of 4-digits and 5 segments.
Control Unit
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, relay driving signal
for oven function, buzzer signal and LED signal.
2) Power Source Circuit
This circuit generates voltage necessary in the control
unit.
Symbol
Voltage
Application
VC
+5.0V
LSI(I-1)
VR
+17.0V
RELAY(RY1)
The voltage under the condition when all LEDs light
up. The voltage VR will vary according to the quantity
of the LEDs which light up.
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.
