Sharp Carousel II R-3A54 Посібник з експлуатації - Сторінка 17

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R -3A54
R-3E54
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
ROo -
RO
3,
RIO -
R13.
When
a key pad is touched,
a signal
is completed
through
the
key unit
and
passed
back to the
LSI
through
R23, R30 -
R32 to perform the function
that
was requested.
Control
Unit
Control
unit
consists
of
LSI,
power
source
circuit,
synchronizing
signal circuit,
ACL circuit,
buzzer circuit
and indicator
circuit.
'1)
2)
3)
LSI
This LSI controls
the key strobe signal, relay driving
signal for oven function
and indicator
signal.
Power
Source
Circuit
This
circuit
generates
voltage
necessary
in the
control
unit.
Symbol
Voltage
Application
VC
-5v
LSI (ICI)
VP
-29v
Fluorescent
display
tube
: Grid
and anode voltage
VFI
3Vac
Filament
of fluorescent
display
tube
VF2
(VFI to VF2 voltaae)
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 verv 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.
(RD919A4U)
5)
Buzzer
Circuit
The buzzer responsive
to signals
from the LSI to
emit noticing
sounds
(key touch sound
and com-
pletion
sound).
6)
Door Sensing
Switch
A switch
to "tell"
the LSI if the door
is open or
closed.
7)
Relay Circuit
To drive the magnetron,
fan motor, turntable
motor
and light the oven lamp.
8)
Indicator
Circuit
Indicator
element is a Fluorescent
Display.
Basically,
a Fluorescent
Display
is a triode
having
a cathode,
a grid and an anode. Usually,
the cath-
ode of a Fluorescent
Display is directly
heated and
the filament
serves as cathode.
The Fluorescent
Display has 6-digits,
13-segments
are used for displaying
figures.
on commercial
frequency.
(RD918A2U)
17