– 62 –
CONTROL BOARD PIN DEFINITIONS
CONNECTOR PIN INPUT OUTPUT
FUNCTION
J1
1
VDC
Feedback of fresh food thermistor value. Thermistor value is NTC
(when temperature drops, resistance value increases), causing
return voltage reduction. This value is used to cycle evaporator
fan, compressor, and condenser fan. Feedback is
fi
ltered to
respond to 8 degrees of change per minute.
J1
2
VDC
Feedback of ambient thermistor value. Thermistor value is NTC
(when temperature drops, resistance value increases), causing
return voltage reduction. This value is used to assist the main
control board in compensating for room ambient higher or lower
than 60°F. Feedback is
fi
ltered to respond to 8 degrees of change
per minute.
J1
3
VDC
Feedback of freezer thermistor value. Thermistor value is NTC
(when temperature drops, resistance value increases), causing
return voltage reduction. This value is used to cycle evaporator
fan, compressor, and condenser fan. Feedback is
fi
ltered to
respond to 8 degrees of change per minute.
J1
4
VDC
Feedback of evaporator thermistor value. Thermistor value is NTC
(when temperature drops, resistance value increases), causing
return voltage reduction. This thermistor value is used to cycle
the defrost heater on during defrost when temperature is below
defrost value and off when the temperature is above defrost value.
This value is also read during power-up to determine if refrigerator
goes into pulldown mode or cycle continuation. Feedback is
un
fi
ltered and responds immediately.
J1
5
VDC
Provides 5 VDC for thermistors.
J1
6
VDC
Model Selector.
J1
7
VDC
Model Selector.
J1
8
VDC
Model Selector.
J1
9
VDC
Model Selector.
MAIN CONTROL BOARD TROUBLESHOOTING
The main control board is located at the back of the refrigerator, above the machine compartment on the
right-hand side. (See
Control Board Connector Locator
.)
(
Continued next page
)