R-872M (serv.man3). Part 2 Description of LSI, Schematic diagrams, PWB assemlbiesPage 18-38 - Sharp Home Appliance Service Manual (repair manual). Page 3

R-872M - 20

39

XOUT

OUT

Internal clock oscillation frequency control output.
Output to control oscillation input of XOUT.

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

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.)

43

P25

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.

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 2 minutes, the relay RY5 will be turned off. The relay RY5 will be turned on
when the oven door is opened and closed.

46-47

P22-P21

OUT

Terminal not used.

48

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.

ON

OFF

During

cooking

L

GND

H.

(Convection or dual cooking)

ON

OFF

During cooking or for 5 minutes after
grill, or for awhile after convection or dual. 

L

GND

H.

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.

LSI(IZA965DR)
The I/O signal of the LSI(IZA965DR) are detailed in the following table.