Sharp R-895(AL)M Service Manual page 27

The I/O signal of the LSI are detailed in the following table.
Pin No. Signal
46 P22
47 P21
48 P20
49-50 P17-P16
51-80
SEG39-SEG10
81 SEG9
82-90
SEG8-SEG0
91 VCC
92 VREF
93 AVSS
94 COM3
95 COM2
96 COM1
97 COM0
98-99 VL3-VL2
100 C2
DESCRIPTION OF LSI
I/O
OUT Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay
(RY2). In 100% operation, 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 repetition
according to the power level.
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 54 second time
base in accordance with the special progrom 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 Terminal not used.
OUT Segment data signal.
Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.)
SEG 0 (90) .................... SEG39 (51)
SEG 1 (89) .................... SEG38 (50)
SEG 2 (88) .................... SEG37 (49)
SEG 3 (87) .................... SEG36 (48)
SEG 4 (86) .................... SEG35 (47)
SEG 5 (85) .................... SEG34 (46)
SEG 6 (84) .................... SEG33 (45)
SEG 7 (83) .................... SEG32 (44)
SEG 8 (82) .................... SEG31 (43)
SEG10 (80) ................... SEG30 (30)
SEG11 (79) ................... SEG29 (29)
SEG12 (78) ................... SEG28 (28)
SEG13 (77) ................... SEG27 (27)
SEG14 (76) ................... SEG26 (26)
SEG15 (75) ................... SEG25 (25)
SEG16 (74) ................... SEG24 (24)
SEG17 (73) ................... SEG23 (23)
SEG18 (72) ................... SEG22 (22)
SEG19 (71) ................... SEG21 (21)
SEG20 (70) ................... SEG20 (20)
OUT Terminal not used.
OUT Segment data signal.
Connected to LCD. Signal is similar to SEG39.
IN Connected to GND.
IN Connected to GND.
IN Connected to VC.
OUT Terminal not used.
OUT Common data signal: COM3.
Connected to LCD (Pin No. 35).
OUT Common data signal: COM2.
Connected to LCD (Pin No. 34).
OUT Common data signal: COM1.
Connected to LCD (Pin No. 33).
IN Power source voltage input terminal.
Standard voltage for LCD.
IN Terminal not used.
Description
ON/OFF time ratio in Micro
cooking
(a. 32second time base)
MICRO
COOK
100%
70%
50%
30%
10%
LCD (Pin No.)
R-895M - 22
ON/OFF time ratio in Micro
cooking
(a. 54second time base)
ON OFF MICRO
COOK
32 sec. 0 sec. 100%
24 sec. 8 sec. 70%
50%
18 sec. 14 sec.
30%
12 sec. 20 sec.
10%
6 sec. 26 sec.
During
cooking
(Grill, Convection, Dual )
ON
20 msec.
During cooking
LSI signal (Pin No.) LCD (Pin No.)
SEG21 (69) ................. SEG19 (19)
SEG22 (68) ................. SEG18 (18)
SEG23 (67) ................. SEG17 (17)
SEG24 (66) ................. SEG16 (16)
SEG25 (65) ................. SEG15 (15)
SEG26 (64) ................. SEG14 (14)
SEG27 (63) ................. SEG13 (13)
SEG28 (62) ................. SEG12 (12)
SEG29 (61) ................. SEG11 (11)
SEG30 (60) ................. SEG10 (10)
SEG31 (59) ................... SEG 9 ( 9)
SEG32 (58) ................... SEG 8 ( 8)
SEG33 (57) ................... SEG 7 ( 7)
SEG34 (56) ................... SEG 6 ( 6)
SEG35 (55) ................... SEG 5 ( 5)
SEG36 (54) ................... SEG 4 ( 4)
SEG37 (53) ................... SEG 3 ( 3)
SEG38 (52) ................... SEG 2 ( 2)
SEG39 (51) ................... SEG 1 ( 1)
ON OFF
54 sec. 0 sec.
40 sec. 14 sec.
29 sec. 25 sec.
18 sec. 36 sec.
9 sec. 45 sec.
H.
GND
OFF
L
H
L