Sharp R-953(SL)M Service Manual page 23

DESCRIPTION OF LSI
LSI(IXA034DR)
The I/O signal of the LSI(IXA034DR) are detailed in the following table.
Pin No. Signal
22 INT1
23 INT0
24 CNVSS
25 RESET
26 P41 IN/OUT
27 P40
28 XIN
29 XOUT
30 VSS
31 P27
32 P26
33 P25
34 P24
35 P23
I/O
OUT Terminal not used.
IN Signal to synchronized LSI with commercial power source frequency(50Hz).
This is basic timing for time processing
of LSI.
IN Connected to VC.
IN Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied. Temporarily
set to "L" level the moment power is applied, at this time the LSI is reset. Thereafter
set at "H" level.
Memory (EEPROM) data input/output.
OUT Memory (EEPROM) clock out.
IN Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit
with respect to XIN terminal.
OUT Internal clock oscillation frequency control output.
Output to control oscillation input of XOUT.
IN Power source voltage: -5V.
VC voltage of power source circuit input.
OUT Grill (TOP) heating element driving signal.
To turn on and off the grill heating
element relay (RY3). "L" level during
grill cooking, convection cooking or
dual cooking, "H" level otherwise.
The heater relay turns on and off
within a 48 second time base in
accordance with the special program
in LSI.
OUT Convection heating element driving signal.
To turn on and off the relay (RY4). "L"
level during grill cooking, convection
cooking or dual cooking, "H" level
otherwise.
The heater relay turns on and off within
a 48 second time base in accordance
with the special program in LSI.
OUT Oven lamp and turntable motor driving signal(Square Waveform : 50Hz).
To turn on and off shut-off relay (RY1).
The square waveform voltage is
delivered to the relay (RY1) driving
circuit.
OUT Convection motor driving signal.
To turn on and off shut-off relay(RY7). "L"
level during convection or dual cooking "H"
level otherwise. (Relay RY7 does not turn on
at preheating mode.)
OUT Fan motor driving signal.
To turn on and off the fan motor relay RY6. "L"
level during cooking, or for 5 minutes after grill
cooking or for a while after convection or dual
cooking. "H" level otherwise.
R-953/963M - 21
Description
20 msec.
Power output
100 %
90 %
80 %
70 %
60 %
50 %
40 %
30 %
20 %
10 %
Power output
100 %
90 %
80 %
70 %
60 %
50 %
40 %
30 %
20 %
10 %
20 msec.
During cooking
During
cooking
(Convection or dual cooking)
ON
ON
H : GND
L (-5V)
ON time OFF time
48 sec. 0 sec.
44 sec. 4 sec.
40 sec. 8 sec.
36 sec. 12 sec.
32 sec. 16 sec.
26 sec. 22 sec.
22 sec. 26 sec.
16 sec. 32 sec.
12 sec. 36 sec.
8 sec. 40 sec.
ON time OFF time
48 sec. 0 sec.
44 sec. 4 sec.
40 sec. 8 sec.
36 sec. 12 sec.
32 sec. 16 sec.
26 sec. 22 sec.
22 sec. 26 sec.
16 sec. 32 sec.
12 sec. 36 sec.
8 sec. 40 sec.
H
L
H.
GND
OFF
L
H. GND
OFF
L
During cooking or for awhile after
grill convection or dual.