TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
The touch control section mainly consists of the following
units as shown in the block diagram.
(1) Power source circuit
(2) Key unit
(3) Control unit
Exchange of signals between each unit is indicated by the
arrows in the block diagram.
The principal functions of these
units and the signals communicated among them are explained
below.
1. Power Source Circuit
This circuit generates voltage necessary in the control and
indicator circuit, from the AC line voltage. In addition,
the 13 signal is available in order to compose a basic stan-
dard time in the clock circuit.
2. Key Unit
The key unit is composed of a kind of matrix circuit; in
which, when one of signals PO - P3 and 00 - Q2 generated
by the LSI operates the key, it is given to the LSI as one
of signals KO - K3.
3. Control Unit
Signals of clock, display, key touch and oven function
control are
al I processed
by one microcomputer
(lX2321)YA).
1) ACL
The circuit to generate signal which resets the LSI to
the initial state when power is supplied.
2) Stop switch
The switch to “tell” the opening and closing of door to
the LSI.
3) Buzzer
The buzzer is responsive to signals from the LSI to
emit noticing sounds (key touch sound and completion
soundj.
4) Relay Circuit
For driving magnetron, turntable motor, fan motor and
lighting oven iamp.
5) Temperature Measurement circuit (R-9450 only)
The temperature of food is measured by the probe.
The probe has a thermistor built in of which resistance,
varies with the temperature. The variation of resistance
is detected by the temperature measurement circuit.
6) Indicator Circuit
This circuit consists of 6-digits, lo-Segments and 1 l-
Segments display, five cooking mode indicators, and
the following indicators using fluorescent display.
COMP, DEFROST, SENSOR, TEMP, COOK, AUTO, kg
(SENSOR, TEMP: R-9450 only)
The method of display is by dynamic drive using DO through
05 as digit selecting signals. The LSI (lX2321YA) output
terminals of each indicator are as follows.
so- s7 : Segment signal (a through h)
u3 - Ul
: Segment signal (i through k)
Gl : COMPU, MED. LOW, HIGH
so
: DEFROST
Sl
: SENSOR (R-9450 only)
s2
: TEMP (R-9450 only)
GO : COOK, AUTO and kg
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