R-774M (serv.man2). Part 1 Text (1-30) - Sharp Home Appliance Service Manual (repair manual). Page 21

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R-774M - 21
DESCRIPTION OF LSI
LSI(IXA094DR)
The I/O signal of the LSI(IXA094DR) are detailed in the following table.
Pin No.
Signal
I/O
Description
ON
OFF
During cooking or for awhile after oven, 
grill (top and bottom grill ) or dual. 
L
GND
H.
38
XIN
IN
Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit
with respect to XOUT terminal.
39
XOUT
OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
40
VSS
IN
Power source voltage: -5V.
VC voltage of power source circuit input.
41
P27
OUT
Bottom 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.
42
P26
OUT
Terminal not used.
43
P25
OUT
Fan motor driving signal.
To turn on and off the fan motor relay RY6.  "L"
level during cooking, or for a while after oven,
grill (top and bottom grill) or dual cooking. "H"
level otherwise.
44
P24
OUT
Terminal not used.
45
P23
OUT
Touch control transformer driving signal.
To turn on and off the shut off relay (RY5). If the oven has not been used for more
than 3 minutes, the relay RY5 will be turned off. The relay RY5 will be turned on
when the oven door is opened and closed.
46-48
P22-P20
OUT
Terminal not used.
49-50
P17-P16
IN
Terminal to change functions according to the model.
51-80
SEG39-SEG10
OUT
Segment data signal.
Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.)
LCD (Pin No.)
LSI signal (Pin No.) LCD (Pin No.)
SEG 0 (90) .................... SEG39 (51)
SEG21 (69) ................. SEG19 (19)
SEG 1 (89) .................... SEG38 (50)
SEG22 (68) ................. SEG18 (18)
SEG 2 (88) .................... SEG37 (49)
SEG23 (67) ................. SEG17 (17)
SEG 3 (87) .................... SEG36 (48)
SEG24 (66) ................. SEG16 (16)
SEG 4 (86) .................... SEG35 (47)
SEG25 (65) ................. SEG15 (15)
SEG 5 (85) .................... SEG34 (46)
SEG26 (64) ................. SEG14 (14)
SEG 6 (84) .................... SEG33 (45)
SEG27 (63) ................. SEG13 (13)
SEG 7 (83) .................... SEG32 (44)
SEG28 (62) ................. SEG12 (12)
SEG 8 (82) .................... SEG31 (43)
SEG29 (61) ................. SEG11 (11)
SEG10 (80) ................... SEG30 (30)
SEG30 (60) ................. SEG10 (10)
SEG11 (79) ................... SEG29 (29)
SEG31 (59) ................... SEG 9 ( 9)
SEG12 (78) ................... SEG28 (28)
SEG32 (58) ................... SEG 8 ( 8)
SEG13 (77) ................... SEG27 (27)
SEG33 (57) ................... SEG 7 ( 7)
SEG14 (76) ................... SEG26 (26)
SEG34 (56) ................... SEG 6 ( 6)
SEG15 (75) ................... SEG25 (25)
SEG35 (55) ................... SEG 5 ( 5)
SEG16 (74) ................... SEG24 (24)
SEG36 (54) ................... SEG 4 ( 4)
SEG17 (73) ................... SEG23 (23)
SEG37 (53) ................... SEG 3 ( 3)
SEG18 (72) ................... SEG22 (22)
SEG38 (52) ................... SEG 2 ( 2)
SEG19 (71) ................... SEG21 (21)
SEG39 (51) ................... SEG 1 ( 1)
SEG20 (70) ................... SEG20 (20)
81
SEG9
OUT
Terminal not used.
82-90
SEG8-SEG0
OUT
Segment data signal.
Connected to LCD. Signal is similar to SEG39.
Power output
ON time
OFF time
100 %
48 sec.
0 sec.
90 %
44 sec.
4 sec.
80 %
40 sec.
8 sec.
70 %
36 sec.
12 sec.
60 %
32 sec.
16 sec.
50 %
26 sec.
22 sec.
40 %
22 sec.
26 sec.
30 %
16 sec.
32 sec.
20 %
12 sec.
36 sec.
10 %
8 sec.
40 sec.
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