Sharp R-930AK-F Service Manual page 27

LSI(IZA797DR):
The I/O signals of the LSI(IZA797DR) are detailed in the following table.
Pin No. Signal
1 VCC
2 VEE
3 AVSS
4 VREF
5 AN7
6 AN6
7-9 AN5-AN3
10 AN2
11 AN1
12 AN0
13 P55
14 P54
15 P53
16 P52
DESCRIPTION OF LSI
I/O
IN Connected to GND.
IN Anode (segment) of Fluorescent Display light-up voltage: -30V.
Vp voltage of power source circuit input.
IN Power source voltage: -5V.
VC voltage of power source circuit input.
IN Reference voltage input terminal.
A reference voltage applied to the A/D converter in the LSI. Connected to GND.(0V)
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.
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.
IN Heating constant compensation terminal.
IN Input signal which communicates the door open/close information to LSI.
Door closed; "H" level signal(0V).
Door opened; "L" level signal(-5V).
IN Input signal which communicates the damper open/close information to LSI.
Damper opened; "H" level signal(0V:GND).
Damper closed; "L" level signal(-5V).
IN Temperature measurement input: OVEN THERMISTOR.
By inputting DC voltage corresponding to the temperature detected by the thermistor,
this input is converted into temperature by the A/D converter built into the LSI.
OUT Digit selection signal.
The relationship between digit signal and digit are as follows;
Digit signal
P03 ........................... 1st.
P02 .......................... 2nd.
P01 ........................... 3rd.
P00 ........................... 4th.
P37 ........................... 5th.
P36 .......................... 6th.
P35 .......................... 7th.
P55 .......................... 8th.
Normally, one pulse is output in every ß
period, and input to the grid of the Fluores-
cent Display.
OUT Oven lamp and turntable motor driving signal. (Square Waveform : 60Hz)
To turn on and off the shut-off relay(RY1).
The square waveform voltage is delivered to
the relay(RY1) driving circuit.
OUT Convection motor driving signal.
To turn on and off shut-off relay(RY5). "L"
level during CONVECTION; "H" level other-
wise.
OUT Cooling fan motor driving signal.
To turn on and off shut-off relay(RY6). "L"
level during both microwave and convection
cooking; "H" level otherwise.
Description
Digit
ß(60Hz)
P03
P02
P01
P00
P37
P36
P35
P55
25
R-930AK-F
R-930AW-F
GND
VP
16.7 msec.
H
L
During cooking
H.
GND
During
OFF
cooking
(Convection)
ON
L
H.
OFF
During
cooking
L
ON
H
L
GND