Sharp Carousel R-310AK, Supplemental Service Manual

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4
R-310AK
R-330AK
R-330AW
A
B
0.1 sec.
2 sec.
H : GND
L : -5V
H : GND
L : -5V
16.7 msec.
During cooking
H : GND
L : -5V
P-HI
H : GND
L : -5V
H : GND
L : -5V
P-70
ON
ON
OFF
OFF OFF
24 sec.
8 sec.
16.7 msec.
H : GND
L : -5V
DESCRIPTION OF LSI
LSI(IZA757DR) : R-330AK/AW
The I/O signal of the LSI(IZA757DR) is detailed in the following table.
Pin No. Signal I/O Description
1 C1 IN Terminal not used.
2 VL1 IN Power source voltage input terminal.
Standard voltage for LCD.
3-6 AN7-AN4 IN Terminal to change cooking constant 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 Terminal not used.
8 AN2 IN To input signal which communicates the door open/close information to LSI.
Door closed; “H” level signal (0V).
Door opened; “L” level signal (-5V).
9 AN1 IN 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.
10 AN0 IN 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.
11-13 P57-P55 OUT Terminal not used.
14 P54 OUT Signal to sound buzzer (2.0KHz).
A: key touch sound.
B: Completion sound.
15-18 P53-P50 OUT Terminal not used.
19-23 P47-P43 OUT Used for initial balancing of the bridge circuit (absolute humidity sensor).
24 INT0 IN
Signal synchronized with commercial power source frequency.
This is basic timing for time processing of LSI.
25-26 P41-P40 OUT Terminal not used.
27 P77 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 P77. When no key is touched, the signal is held at “H” level.
28 P76 IN Signal similar to P77.
When either G11 line on key matrix is touched, a corresponding signal will be input into P76.
29 P75 IN
Signal similar to P77.
When either G10 line on key matrix is touched, a corresponding signal will be input into P75.
30 P74 IN Signal similar to P77.
When either G9 line on key matrix is touched, a corresponding signal will be input into P74.
31 P73 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.
32 P72 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.