Sharp KB-3401LS Supplemental Service Manual page 21

Pin No. Signal I/O
48-52 P04-P00 OUT
53 P57 OUT
54 P56 IN
55 TXD IN
56 RXD IN
57 P53 IN
58 P52 OUT
59 P5 IN
60 INT0 IN
6 AVSS IN
62 VREF IN
63 AN7 IN
64 AN6 IN
the signals holds "H" level during microwave cook-
ing 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.
Used for initial balancing of the bridge circuit (absolute humidity sensor).
Common relays driving signal. (Square Waveform : 60Hz)
To turn on and off the shut-off relays (RY and
RY3). The square waveform voltage is delivered
to the relays (RY and RY3) driving circuit.
Signal coming from key unit.
Signal coming from key unit.
Signal coming from key unit.
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 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.
Input signal which communicates the drawer door open/ close information to
LSI.
Door opened; "H" level signal(+5V).
Door closed; "L" level signal(0V).
Signal to synchronize LSI with commercial power source frequency.
This is the basic timing for all real time processing of LSI.
A/D converter power source voltage.
The power source voltage to drive the A/D converter in the LSI.
Reference voltage input terminal.
A reference voltage applied to the A/D converter in the LSI. Connected to +5V.
AH sensor input.
This input is an analog input terminal from the AH sensor circuit, and connected to the
A/D converter built into the LSI.
Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is
an analog input terminal from the AH sensor circuit, and connected to the A/D converter
built into the LSI.
2
Description
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.
A
B
.0 sec
C
KB-3401LS
KB-3401LK
KB-3401LW
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.
6.7 msec.
H: +5V
L: GND
During cooking
H : +5V
L : GND
6.7 msec.
0. sec
2.0 sec
.0 sec
H: +5V
L: GND