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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
36
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