Sharp KB-3425LS Service Manual page 33

Pin No. Signal I/O
77 P3 OUT
78 P2 OUT
79 P OUT
80 P0 OUT
8 - 88 D7 - D0 OUT
89 AN7 OUT
90 AN6 IN
9 AN5 IN
92 AN4 IN
93 AN3 IN
94 AN2 IN
95 AN IN
96 AVSS IN
97 AN0 IN
98 VREF IN
99 AVCC IN
00 P97 OUT
"L" level: During fan motor OFF.
Fan motor (Drawer) driving signal.
To turn on and off relay(RY5).
"H" level: During fan motor ON.
"L" level: During fan motor OFF.
Top heater driving signal.
To turn on and off relay(RY4).
"H" level: During top heater ON.
"L" level: During top heater OFF.
Oven common relay driving signal.
To turn on and off relay(RY3).
"H" level: During oven common relay ON.
"L" level: During oven common relay OFF.
Oven lamp and stirrer motor (drawer) driving signal.
To turn on and off relay(RY).
"H" level: During oven lamp and stirrer motor ON.
"L" level: During oven lamp and stirrer motor OFF.
Data signal is output to LCD driver.
Turminal not used.
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.
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.
Terminal to change the specifications of the LSI.
By using A/D converter contained in the LSI, DC voltage in accordance wityh the Model
in operation is applied to set up its cooking constant.
Input signal which inform the drawer door is in the middle position between the opened
position and the closed position, to LSI from the door position switch rear.
Input signal which communicates the oven door locked information to LSI.
Door unlocked; "H" level signal(+5V).
Door locked; "L" level signal(0V).
Input signal which communicates the oven door unlocked information to LSI.
Door locked; "H" level signal(+5V).
Door unlocked; "L" level signal(0V).
A/D converter power source voltage.
The power source voltage to drive the A/D converter in the LSI.
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.
Reference voltage input terminal.
A reference voltage applied to the A/D converter in the LSI. Connected to +5V.
A/D converter power source voltage.
The power source voltage to drive the A/D converter in the LSI. Connected to Vcc
(+5V).
Common relays driving signal. (Square Waveform : 60Hz)
To turn on and off the shut-off relays (RY and RY3). The square waveform voltage is
delivered to the relays (RY and RY3) driving circuit.
33
Description
ON
ON
ON
ON
KB-3425LS/K/W
KB-4425LS/K/W
H: +5V
L: GND
OFF
H: +5V
L: GND
OFF
H: +5V
L: GND
OFF
H: +5V
L: GND
OFF
6.7 msec.
H: +5V
L: GND
During cooking