Table of Contents
Advertisement
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.
(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
POO,PO5,PlO,P13,P14,P22,P23
and P25..
When
a key pad is touched,
a signal
is completed
through
the key unit
and
passed
back to the
LSI
through
RO-R3 to perform
the function
that was re-
quested.
Control
Unit
Control
unit
consists
of
LSI, power
source
circuit,
synchronizing
signal circuit,
ACL circuit,
buzzer circuit,
temperature
measurement
circuit,
absolute
humidity
sensor circuit and indicator
circuit.
(RD915Bl
U)
1)
2)
3)
LSI
This
LSI controls
the
temperature
measurement
signal,
AH sensor signal,
key strobe signal,
relay
driving
signal for oven function
and indicator
sig-
nal.
(RD916Al
U)
Power
Source
Circuit
This circuit
generates
voltages
necessary
for the
control
unit from the AC line voltage.
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)
5)
6.1
7)
8)
9)
ACL Circuit
A circuit to generate signals resetting
the LSI to the
initial
state when
power is applied.
Buzzer
Circuit
The buzzer is responds
to signals
from the LSI to
emit
noticeable
sounds
(key
touch
sound
and
completion
sound).
Temperature
Measurement
Circuit(l):
Oven
The temperature
in the oven cavity is sensed by the
thermistor.
The variation
of resistance
according
to sensed
temperature
is detected
by the temperature
meas-
urement circuit
and the result applied
to LSI.
The LSI uses this information
to control
the relay
and display
units.
Absolute
Humidity
Sensor
Circuit
This circuit
detects the humidity
of the food which
is being cooked, to control
its automatic
cooking.
Stop
Switch
A switch
to "tell"
the LSI if the door
is open or
closed.
Relay
Circuit
To drive the magnetron,
heating
element,
fan mo-
tor, convection
motor, damper motor and light the
oven lamp.
1
10) 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,
15-segments
are used for displaying
figures.
13
Advertisement
Table of Contents
