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R32STM - 10
TOUCH CONTROL PANEL ASSEMBLY
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 (key touch sound and completion
sound).
audible sounds (key touch sound and 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.
light the oven lamp.
8) Back Light Circuit
A circuit to drive the back light (Light emitting diodes
LD1 - LD5).
LD1 - LD5).
9) Indicator Circuit
This circuit consists of 7-digits, 30-segments and 4-
common electrodes using a Liquid Crystal Display.
common electrodes using a Liquid Crystal Display.
(1) Key Unit
(2) Control Unit
(2) Control Unit
The principal functions of these units and signals com-
municated among them are explained below.
municated among them are explained below.
Key Unit
The key unit is composed of a matrix, signals generated
in the LSI are sent to the key unit from P11 - P17.
When a key pad is touched, a signal is completed
through the key unit and passed back to the LSI through
P20 - P23 to perform the function that was requested.
in the LSI are sent to the key unit from P11 - P17.
When a key pad is touched, a signal is completed
through the key unit and passed back to the LSI through
P20 - P23 to perform the function that was requested.
Control Unit
Control unit consists of LSI, power source circuit,
synchronizing signal circuit, ACL circuit, buzzer circuit,
indicator circuit, encoder circuit and back light circuit.
synchronizing signal circuit, ACL circuit, buzzer circuit,
indicator circuit, encoder circuit and back light circuit.
1) LSI
This LSI controls the key strobe signal, relay driving
signal for oven function and indicator signal.
signal for oven function and indicator signal.
2) Power Source Circuit
This circuit generates voltage necessary in the
control unit.
control unit.
Symbol
Voltage
Application
VC
-5.2V
LSI(IC1)
OUTLINE OF TOUCH CONTROL PANEL
The touch control section consists of the following units
as shown in the touch control panel circuit.
as shown in the touch control panel circuit.
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