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.
(RD91 lA3U)
Key Unit
The key unit is composed
of a matrix, signals generated
in the LSI are sent to the key unit through
P62, P63
and P70- P73.
-..-.
.-
-
When
a key pad is touched,
a signal
is completed
through
the
key unit
and
passed
back
to the
LSI
through
PIO-PI3
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
and indicator
circuit.
(RD915BlU)
1)
2)
3)
LSI
This LSI controls
the key strobe signal, relay driving
signal for oven function
and indicator
signal.
(RD916Al
U)
Power
Source
Circuit
This
circuit
generates
voltage
necessary
in the
control
unit.
Svmbol
Voltaae
Aoolication
VDD
-12v
LSI (ICI ), ACL circuit
VREF
-6.15V
LSI (ICI)
VP
-26.5V
Fluorescent
display
tube
: Grid
and anode voltage
VF+
-15.2V
F$rrent
of fluorescent
display
VF-
(VF+ to VF- voltage:
AC 3.5V)
Synchronizing
Signal
Circuit
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
4)
ACL Circuit
A circuit
to generate
a signal which
resets the LSI
to the initial state when power is supplied.
(RDSl
SAl U)
5)
Buzzer
Circuit
The buzzer is responsive
to signals
from the LSI
to emit
noticing
sounds
(key touch
sound
and
completion
sound).
6)
Stop
Switch
A switch
to "tell"
the LSI if the door is open or
closed.
(RD91 BA2U)
7)
Relay
Circuit
To drive the magnetron,
fan motor, turntable
motor
and light the oven lamp.
8)
Indicator
Circuit
(RD91 AA1 U)
(RD91 CB2U)
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 6-digits,
13-segments
are
used for displaying
figures.
(RD91 DA1 U)
I
I
on commercial
frequency.
(RD918Al
U)
15
Advertisement
