Sharp KB-3425LS Service Manual page 31

Pin No. Signal I/O
20 INT0 IN
2 P8 OUT
22 TA4OUT OUT
23 P77 OUT
24 TA3OUT OUT
25 TA2IN IN
26-30 P74-P70 OUT
3-33 A67-A65 OUT
34 P64 IN
35 TXD0 IN
36 RXD0 IN
37 P6 OUT
38 P60 IN
39 RDY IN
40 ALE OUT
4 HOLD IN
42 HLDA OUT
43 BCLK IN
44 RD OUT
45 WRH OUT
46 WR OUT
Signal to synchronize LSI with commercial power source frequency.
This is the basic timing for all real time processing of LSI.
Signal to change the rotational direction is output to the Microwave drawer door
open-close motor.
Signal to sound buzzer.
A: Key touch sound.
B: Completion sound.
C: When the oven stops so that the food can be
checked in Automatic cooking mode.
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay(RY2). In 00%
power operation, the signals holds "H" level during
microwave cooking and "L" level while not cooking.
In other cooking modes (90%, 80%, 70%, 60%,
50%, 40%, 30%, 20%, 0%, 0%) the signal turns
to "H" level and "L" level in repetition according to
the power level.
Signal to change the rotational speed is output to the Microwave drawer door open-close
motor.
Plus signal coming from the Microwave drawer door open-close motor is input into TA2IN
as revolution number.
Used for initial balancing of the bridge circuit (absolute humidity sensor).
Turminal not used.
To input signal which communicates the oven door open/close information to
LSI.
Door open "H" level signal (+5V). Door close "L" level signal (GND).
Signal coming from key unit.
Signal coming from key unit.
Signal to reset LSI.
Signal is output to reset IC-2, IC-3 and IC-4.
Signal coming from key unit.
Connected to VCC2 (+3.3V).
Turminal not used.
Connected to VCC2 (+3.3V).
Turminal not used.
Connected to VCC2 (+3.3V).
Read strobe signal is outout to the LCD.
Turminal not used.
Write strobe signal is outout to the LCD.
3
Description
6.7 msec.
0. sec
A
B
.0 sec
C
VARI MODE
00% power
90% power
80% power
70% power
60% power
50% power
40% power
30% power
20% power
0% power
0% power 0 sec.
KB-3425LS/K/W
KB-4425LS/K/W
H : +5V
L : GND
2.0 sec
.0 sec
H: +5V
L: GND
Microwave cooking mode
Other cooking mode
ON TIME OFF TIME ON TIME OFF TIME
32 sec. 0 sec. 60sec. 0ec.
30 sec. 2 sec. 54sec. 6sec.
26 sec. 6 sec. 48sec. 2sec.
24 sec. 8 sec. 42sec. 8sec.
22 sec. 0 sec. 36sec. 24sec.
8 sec. 4 sec. 30sec. 30sec.
6 sec. 6 sec. 24sec. 36sec.
2 sec. 20 sec. 8sec. 42sec.
8 sec. 24 sec. 2sec. 48sec.
6 sec. 26 sec. 4sec. 56sec.
32 sec. 0sec. 60sec.