Sharp R-212B Service Manual page 52

R-212B
Pin No. Signal
23 D6 OUT
24 D7 IN/OUT
25 D8 OUT
26 NC
27 F0
28 F1
29 F2
30 F3
31-32 NC
33 XOUT OUT
34 XIN
35 CNTR OUT
36 VDD
I/O
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2). In
100% POWER operation, the signals hold
"L" level during microwave cooking and
"H" level while not cooking. In other cook-
ing modes (70%, 50%, 30%, 10%) the
signal turns to "H" level and "L" level in
repetition according to the power level.
Terminal not used.
Oven lamp, turntable motor and fan motor driving signal(Square Waveform
: 50Hz).
To turn on and off shut-off relay
(RY1). The square waveform volt-
age is delivered to the relay (RY1)
driving circuit and relay(RY2) con-
trol circuit.
No connection terminal.
IN Input signal which communicates the door open/close information to LSI.
Door closed; "H" level signal.
Door opened; "L" level signal.
Terminal not used.
IN Signal to synchronize LSI with commercial power source frequency.
This is basic timing for all real time process-
ing of LSI.
IN Signal coming from encoder.
Signal similar to INT. Pulse signals are input into F3.
No connection terminal.
Internal clock oscillation frequency control output.
Output to control oscillation input of XOUT.
IN Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit
with respect to XIN terminal.
Signal to sound buzzer.
A: Completion sound.
IN Power source voltage: 0V.
The power source voltage to drive the LSI is input to VDD terminal.
Description
A
16
ON/OFF time ratio in Mi-
cro cooking
(a. 32second time base)
MICRO ON OFF
COOK
100% 32sec. 0sec.
70% 24sec. 8sec.
50% 18sec. 14sec.
30% 12sec. 20sec.
10% 6sec. 26sec.
20 msec
During cooking
20 msec
2.4 sec
H: GND
L: -5V
H
L
H : GND
L (-5V)