Sharp R-6R50 - Page 14

3-BA50(W)/(B)
3-6G50{W}/(B}
t-6G52(W)/(B)
1-6R70(W)/{B)
TOUCH
CONTROL
PANEL
ASSEMBLY
OUTLINE
OF
TOUCH
CONTROL
PANEL
(R-6G50/R-6G52)
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
signat
commun-
icated
among
them
are
explained
below.
Key Unit
The
key
unit
is
composed
of
a
matrix,
signals
generated
in
the
LS]
are
sent
to
the
key
unit
through
P33
—
P36.
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
requested.
Control
Unit
Control
unit
consists
of
LSI
(IZA1S53DR),
power
source
circuit,
synchronizing
signal
circuit,
ACL
circuit,
buzzer
circuit
and
indicator
circuit.
1) LSI
This
LS!
controls
the
key
strobe
signal,
relay
driving
signal
for oven function and indicator signal.
2) Power Source Circuit
This
circuit
generates
voltages
[VC:
—5V,
VF1:
—23V,
VF2:
—26V,
VA:
—15V
and
Vp:
—34V]
necessary
in
the
contro] unit.
3) 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
on
commercial
frequency.
.
4) ACL Circuit
A
circuit
to
generate
signals
resetting
the
LSI
to
the
initial
state when power is supplied.
5) Buzzer Circuit
The
buzzer
is
responsive
to
signals
from
the
LSI
to
emit
noticing
sounds
(key
touch
sound
and
completion
sound).
24
6) Door Switch
A
switch
to
“tell”
the
LS!
if
the
door
is
open
or
closed.
7) Relay Circuit
To
drive
the
magnetron,
grill
heating
element,
cooling
fan
motor, and light the oven lamp.
8) 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 6-digits, 15-segments
=
.) i ie
R-6R50(
R-8G5O}
R-BG52{
R-6R70(
DESCRIPTION OF LSI (R-6G50/R-6G52)
LS] (IZA1538DR)
The I/O signal of the LS! (IZA153DR) is detailed in the following table.
Pin. No.
Description
Reference voltage input terminal.
A reference voltage applied to the A/D converter in the LSI.
Connected to GND. (OV)
Terminal to change functions according to the model.
Signal in accordance with the model in operation is applied to set up its function.
input signal which communicates the door open/close information to LSI.
Door closed; “H” level! signal (OV)
Door opened; "L" level signal (—5V)
Terminal not used. Connected to GND.
Terminal to change functions according to the model.
Signal in accordance with the model in operation is applied to set up its function.
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2).
In High operation, the signals holds “’L” level during microwave cooking and “H” level
while not cooking. In other cooking modes (MED HIGH, MED, MED LOW, LOW) the’
signal turns to “H” level and “’L”’ level in repetition according to the power level.
ON
HIGH |
|
ON ”
MED HIGH 24 sec.
Pa Ss (a eee
MED an LE
Pore |
ON a
MED Low L—2#=.{, 20s]
; 4: GND
ON
LOW 26sec.
baal OFF L
32 sec,
ee —_ _ ————e|
Oven lamp driving signal (Square waveform: 50Hz).
To turn on and off shut-off relay (RY1). |
The square waveform voltage is delivered to the RY1 driving circuit and relays (RY2,
RY3 and surge) contro! circuit.
t 20 msec.
TAR
Buring cooking