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Acer R-1200 Wartungshandbuch Seite 21

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19
R-1200
R-1201
DESCRIPTION OF LSI
LSI
The I/O signal of the LSI is detailed in the following table.
Pin No. Signal I/O Description
1-2 VL2-VL1 IN Power source voltage input terminal.
Standard voltage for LCD.
3-6 AN7-AN4 IN
Terminal to change cooking input according to the Model.
By using the A/D converter contained in the LSI, DC voltage in accordance with the Model
in operation is applied to set up its cooking constant.
7 AN3 OUT Back light circuit (Light emitting diodes) driving signal.
8 AN2 IN
To input signal which communicates the door open/close information to LSI.
Door close "H" level signal (0V). Door open "L" level signal (-5V).
9-10 AN1-AN0 OUT Terminal not used.
11-13 P57-P55 OUT Terminal not used.
14 CNTR0 OUT
Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
15 P53 OUT Terminal not used.
16 P52 OUT
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.
17-18 P51-P50 OUT Terminal not used.
19 P47 OUT
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.
20 P46 IN Signal coming from touch key.
When either G12 line on key matrix is touched, a corresponding signal out of P20 - P27 will
be input into P46. When no key is touched, the signal is held at "H" level.
21 P45 IN
Signal similar to P46.
When either G11 line on key matrix is touched, a corresponding signal will be input into P45.
22 P44 IN
Signal similar to P46.
When either G10 line on key matrix is touched, a corresponding signal will be input into P44.
23 P43 IN
Signal similar to P46.
When either G9 line on key matrix is touched, a corresponding signal will be input into P43.
24 INT0 IN
Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
25 P41 OUT Terminal not used.
26 P40 IN Connected to GND through the pull-down resistor R100.
27
RESET
IN
Auto clear terminal.
Signal is inputted to reset the LSI to the initial state when power is applied.
28-29 P71-P70 OUT Terminal not used.
A
B
0.1 sec.
2.0 sec.
H : GND
L : -5V
H : GND
L : -5V
16.7 msec.
During cooking
H : GND
L : -5V
Maximum
out put
70% of maximum
out put
H : GND
L : -5V
H : GND
L : -5V
ON
ON
OFF
OFF OFF
24 sec.
8 sec.
16.7 msec.
H : GND
L : -5V
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