Sharp R-1405 Service Manual page 25

Pin No. Signal I/O
7 AN3 OUT
8 AN2 IN
9-10 AN1-AN0 OUT
11-13 P57-P55 OUT
14 CNTR0 OUT
15 P53 OUT
16 P52 OUT
17-18 P51-P50 OUT
19 P47 OUT
20 P46 IN
21 P45 IN
22 P44 IN
23 P43 IN
24 INT0 IN
25 P41 OUT
26 P40 IN
27 IN
RESET
28-29 P71-P70 OUT
30 XIN IN
31 XOUT OUT
32 VSS IN
33 P27 OUT
Back light circuit (Light emitting diodes) driving signal.
To input signal which communicates the door open/close information to LSI.
Door close "H" level signal (0V). Door open "L" level signal (-5V).
Terminal not used.
Terminal not used.
Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
Terminal not used.
Oven lamp, fan motor and turntable motor driving signal
To turn on and off shut off relay (RY1). The
square waveform voltage is delivered to the
RY1 driving circuit and RY2 control circuit.
Terminal not used.
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2). The
signals holds "L" level during microwave cook-
ing and "H" level while not cooking. In other
cooking modes (variable cooking) the signal
turns to "H" level and "L" level in repetition
according to the power level.
Signal coming from touch key.
When either G12 line on key matrix is touched, a corresponding signal out of P20, P21,
P22, P25 and P26 will be input into P46. When no key is touched, the signal is held at
"H" level.
Signal similar to P46.
When either G11 line on key matrix is touched, a corresponding signal will be input into
P45.
Signal similar to P46.
When either G10 line on key matrix is touched, a corresponding signal will be input into
P44.
Signal similar to P46.
When either G9 line on key matrix is touched, a corresponding signal will be input into P43.
Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
Terminal not used.
Connected to GND through the pull-down resistor R100.
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied.
Terminal not used.
Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
Power source voltage: -5.0V.
VC voltage of power source circuit input.
Terminal not used.
23
Description
0.1 sec.
A
2.0 sec.
B
16.7 msec.
During cooking
Maximum
output
70% of
maximum
output
(ON and OFF times for other power level.)
H : GND
L : -5V
H : GND
L : -5V
H : GND
L : -5V
OFF
H : GND
ON
L : -5V
OFF OFF
H : GND
24 sec.
8 sec.
ON
L : -5V
H : GND
L : -5V
16.7 msec.
R-1405
R-1406