Sharp R-300BW Service Manual page 21

Pin No. Signal I/O
23 D6 OUT
24 D7 IN/OUT
25 D8 OUT
26 NC
27 F0 IN
28 F1
29 F2 IN
30 F3 IN
31-32 NC
33 XOUT OUT
34 XIN IN
35 CNTR OUT
36 VDD IN
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 cooking 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 : 60Hz).
To turn on and off shut-off relay (RY1).
The square waveform voltage is deliv-
ered to the relay (RY1) driving circuit and
relay(RY2) control circuit.
No connection terminal.
Input signal which communicates the door open/close information to LSI.
Door closed; "H" level signal.
Door opened; "L" level signal.
Terminal not used.
Signal to synchronize LSI with commercial power source frequency.
This is basic timing for all real time processing of
LSI.
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.
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.
Power source voltage: 0V.
The power source voltage to drive the LSI is input to VDD terminal.
19
Description
ON/OFF time ratio in Micro
cooking
(a. 32second time base)
MICRO
COOK
100%
70%
50%
30%
10%
16.7 msec
During cooking
16.7 msec
2.0 sec
A
R-300BW
ON OFF
32sec. 0sec.
24sec. 8sec.
18sec. 14sec.
12sec. 20sec.
6sec. 26sec.
H
L
H : GND
L (-5V)
H: GND
L: -5V