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PLMV169DCC
The touch control section consists of the following units
as shown in the touch control panel circuit.
(1) Key Unit
(2) Control Unit (The Control unit consists of LSI Unit and
Power U nit)
The principal functions of these units and the signals commu-
nicated 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 P10-P17.
When a key pad is touched, a signal is completed through
the key unit and passed back to the LSI through P41, P42,
AN8, AN9, AN10 and AN11 to perform the function that was
requested.
Control Unit
Control unit consists of LSI, power source circuit, synchro-
nizing signal circuit, ACL circuit, buzzer circuit, relay circuit
indicator circuit and back light circuit.
1) LSI
This LSI controls the key strobe signal, relay driving signal
for oven function and indicator signal.
2) Power Source Circuit
This circuit generates voltages necessary for the control
unit from the AC line voltage.
In addition, the synchronizing signal is available in order to
compose a basic standard time in the clock circuit.
Symbol
Voltage
VC
-5.1V
3) Synchronizing Signal Circuit
The power source synchronizing signal is available in order
to compose a basic standard time in the clock circuit. It
incorporates a very small error because it works on
commercial frequency.
4) ACL Circuit
A circuit to generate a signals which resetting the LSI to the
initial state when power is applied.
5) Buzzer Circuit
The buzzer is responds to signals from the LSI to emit
audible sounds (key touch sound and completion sound).
6) Door Sensing Switch
A switch to inform the LSI if the door is open or closed.
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
Application
LSI(IC1)
7) Relay Circuit
To drive the magnetron, fan motor, stirrer motor, turntable
motor, hood motor, and light the oven lamp and hood lamp.
8) Indicator Circuit
This circuit consists of 40 segments and 16 common
electrodes using a Light Crystal Display.
The Light Crystal Display (LCD) is drived by LCD driver
IC3.
9) Back Light Circuit
A circuit to drive the back light (Light emitting diodes LD1-
LD10).
10) Absolute Humidity Sensor Circuit
This circuit detects moisture of the cooking food to allow
its automatic cooking.
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