R-61FBSTM - Sharp Home Appliance Service Manual (repair manual). Page 17

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R-61FBSTM/R-62FBSTM - 17
DESCRIPTION OF LSI
LSI(IXA216DRZZ)
The I/O signal 
of the LS
I(IXA216DRZZ) are detailed in the following table.
42
P71
OUT
Fan motor driving signal
To turn on and off the fan motor relay RY4.
"L" level during cooking, or for 2 minutes
after Grill cooking or Dual grill cooking. "H"
level otherwise.
43
P72
OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay
(RY2). In 100% POWER op-
eration, the signals hold “L” level
during microwave cooking and
“H” level while not cooking. In
other cooking modes (70%,
50%, 30%, 10%) the signal turns
to “H” level and “L” level in rep-
etition according to the power
level.
44
AVDD
IN
A/D converter power source voltage.
The power source voltage to drive the A/D converter in the LSI. Connected to GND.
45-48
ANI5-ANI2
IN
Terminal to change model and cooking input according to the Model.
By using the A/D converter contained in the LSI, DC voltage in accordance with the Model
in operation is applied to set up its cooking constant. And DC voltage is dependent on the
Model.
49
ANI1
IN
To input signal which communicates the door open/close information to LSI.
Door close “H” level signal (0V).  Door open “L” level signal (-5V).
50
ANI0
IN
Connected to VSS.
51
AVSS
IN
A/D converter power source voltage.
The power source voltage to drive the A/D converter in the LSI.
52
P11
OUT
Terminal not used.
53
P10
OUT
Terminal not used.
54
P33
OUT
Grill heating element driving signal
To turn on and off the grill heating element
relay RY2. "L" level during Grill cooking or
Dual grill cooking. "H" level otherwise.
55
INTP2
IN
Signal coming from encoder.
When encoder is turned, the contacts of encoder make pluse signals. And pulse signals
are input into INTP2.
56
INTP1
IN
Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
57
INTP0
IN
Signal comming from encorder.
Signal similar to INTP2. Pulse signals are input into INTP0.
58-59
P26-P25
OUT
Terminal not used.
60
P24
OUT
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to P50 or P51 terminal while
the tact switch SW3 or SW4 is touched.
61
P23
OUT
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to P51 terminal while the tact
switch SW2 is touched.
62
P22
OUT
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to P51 terminal while the tact
switch SW1 is touched.
63
BZO90
OUT
Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
64
P20
OUT
Terminal not used.
Pin No.
Signal
I/O
Description
H : GND
During cooking, or for 2 minutes after
grill cooking or dual grill cooking 
ON
OFF
ON/OFF time ratio in Micro
cooking
(a. 32second time base)
MICRO
ON
OFF
COOK
100%
32 sec.
0 sec.
70%
24 sec.
8 sec.
50%
18 sec. 14 sec.
30%
12 sec. 20 sec.
10%
6 sec. 26 sec.
MICRO
ON
OFF
COOK
100%
48 sec.
0 sec.
70%
36 sec. 12 sec.
50%
26 sec. 22 sec.
30%
16 sec. 32 sec.
10%
8 sec. 40 sec.
ON/OFF time ratio in Micro
cooking
(a. 54second time base)
H : GND
During cooking
ON
OFF
(Grill or Dual grill)
20 msec.
H : GND
L : -5V
A
B
0.1 sec.
2.0 sec.
H : GND
L : -5V
H : GND
L : -5V
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