Sharp R-6R50 - Page 11

1-6RS50(W)/(B}
1-6 GSO(W)/(B)
1-6G52(W)/{B)
t-GR70(W)/(B}
TOUCH
CONTROL
PANEL
ASSEMBLY
OUTLINE
OF
TOUCH
CONTROL
PANEL
(R-6R50/R-6R70)
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 signal commun-
‘ic¢ated 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—pP37.
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.
Contro! Unit
Control unit consists of LSI (IZA153DR), power source
circuit, synchronizing signal circuit, ACL circuit, buzzer
circuit and indicator circuit.
1) LSI
This LSI 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:
—28V,
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 compietion sound).
18
6)
Door Switch
A
switch
to
‘tell’
the LSI
if
the
door
is
open
or
closed.
Relay Circuit
To drive the magnetron, grill heating element, cooling fan
motor, rotisserie motor and light the oven lamp.
Indicator Circuit
Indicator element is a Fluorescent Display.
Basically, a Fluorescent Display is triode having a cathode,
a grid and an anode.
is directly heated and the filament serves as
cathode,
The
Fluorescent
Display
6-digits,
15-segments
Display
Usually, the cathode of a Fluorescent
A- -BR7
DESCRIPTION OF LSI (R-6R50/R-6R70)
LS) (IZA153DR)
The
VO
signal
of
the
LSI
(IZA153DR)
is
detailed
in
the
following
table.
|
Pin.
No.
|
Signal
/o
Description
Reference voltage input terminal.
A
reference
voltage
applied
to
the
A/D
converter
in
the
LSI.
Connected to GND. (OV)
.
2
IN7
IN
Terminal
to
change
functions
according
to
the
model.
2
|
me
|
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.
'H” level signal (OV)
level signal (—5V)
4 INS IN
Door closed;
Door opened; “L’’
IN Terminal not used. Connected to GND.
Terminal to change functions according to the model.
9 INO IN
|
Signal
in
accordance
with
the
mode!
in
operation
is
applied
to
set
up
its
function.
cm, gr
fo
(
}
10
P47
OUT
Magnetron
high-voltage
circuit
driving
signal.
oa E
“Senn
To
turn
on
and
off
the
cook
relay
(RY2).
In
High
operation,
the
signals
holds
‘‘L’’
Jevel
during
microwave
cooking
and
’’H”
jevel
while
not
cooking.
In
other
cooking
modes
(MED
HIGH,
MED,
MED
LOW,
LOW)
the
|
signai
turns
to
“H"
Jevel
and
“L"’
level
in
repetition
according
to
the
power
level,
. : ON
é HIGH |
, ON
Lae ; a . MED HIGH 24 sec. | asec, |
a a oo . os. | OFF
OFF
ON :
, OFF
fe)
+H: GND
LOW
: ; N .
1
.
:
:
Gaal
OFF
L
32 sec.
Oven lamp driving signal (Square waveform: ilala
To turn on and off shut-off relay (RY?).
|
The
square
waveform
voitage
is
delivered
to
the
RY1
driving
circuit
and
relays
{RY2,
11 P46 OUT
RY3 and surge} control circuit.
: | . 20 msec.
During cooking
19