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iwH55
R-4X5.5
R-4X558
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
The touch control section consists of the following units
as shown in the touch control panel circuit.
3) Synchronizing Signal Circuit
(1) Key Unit
(2) Control Unit
The principal functions of these units and the signals
communicated 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 through B2,B3,B5,
B6,B7,GO and Gl. When a key pad is touched, a signal
‘is completed through the key unit and passed back to the
LSI through HO - H3 to perform the function that was re-
quested.
Control U nit
Control; unit consists of LSI, power source circuit, syn-
chronizing signal circuit, ACL circuit, buzzer circuit, tem-
perature measurement circuit, reheat sensor circuit and
indicator circuit.
1) LSI
This LSI controls the temperature measurement sig-
nal, reheat sensor signal, key strobe signal, relay driv-
ing signal for oven function and indicator signal.
2) Power Source Circuit
This circuit generates voltage necessary in the control
unit.
Symbol Voltage Application
VC
-5.2v
LSI(ICl), ACL circuit
VP
-25V Fluorescent display tube : Grid and
anode voltage
VFl
3Vac
Filament of fluorescent display tube
VF2
(VFl to VF2 voltage)
4)
ACL Circuit
A circuit to generate a signal which resets the LSI to
the initial state when power is supplied.
5)
Buzzer Circuit
The buzzer is responds to signals from the LSI to emit
noticing sounds (key touch sound and completion
sound).
6)
Reheat Sensor Circuit
This circuit detects moisture of a food which is cooking
to allowl its automatic cooking.
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.
7) Stop Switch
A switch to “tell” the LSI if the door is open or closed.
8) Relay Circuit
To drive the magnetron, fan motor, turntable motor
and light the oven lamp.
9) Indicator Circuit
Indicator element is a Fluorescent Display.
Basically, a Fluorescent Display is triode having a
cathode, a grid and an anode. Usually, the cathode of
a Fluorescent Display is directly heated and the
filament serves as cathode.
The Fluorescent Display has 6-digits, 13-segments
are used for displaying figures.
10) Weight Sensor Circuit
The circuit measures the weight of food by piezo-elec-
tric device.
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