5-5
Electrical Shock Hazard
Disconnect power before servicing.
Replace all panels before operating.
Failure to do so can result in death or electrical shock.
MAIN CONTROL BOARD
Refer to page 4-18 for the procedure for servicing the main control board.
NOTE: See the chart for the main control board test specifications.
INPUTS
P4
THERMISTORS
P3
DISPLAY BOARD
P2
120 VAC SUPPLY
P5
P6
P7
OUTPUTS
1
1
2
1 2
3
1 2 3
4
3 4
5 6 7 8
2 3 4 5
1
2
3
4
5
1
2
3
4
5
10 9 8 7 6
PLUG
PIN #
DESCRIPTION
OUTPUT
CONDITION
1
Communication Line
N / A
2
Display Voltage
12 VDC
Measured at pins 2 & 3
3
GND
GND
1
Ref. Thermistor
GND
2
Frz. Thermistor
GND
3
Ref. Thermistor Output
5 VDC
Measured at pins 1 & 3
4
Frz. Thermistor Output
5 VDC
Measured at pins 2 & 4
1
N / A
2
N / A
3
N / A
4
Ref. Door Input
120 VAC
Voltage present when door
is open
5
Ice Maker Valve Input
120 VAC
Voltage present when ice
maker is energized
6
Dispenser Valve Input
120 VAC
Voltage present when
dispenser valve is energized
7
Bimetal Input
120 VAC
Voltage present when
bimetal is closed
8
N / A
1
AC GND
AC GND
2
AC L1
120 VAC
3
AC Neutral
AC Neutral
4
AC Neutral
AC Neutral
5
AC L1
120 VAC
1
Condenser Fan
120 VAC
Voltage present when
condenser fan is on
2
N / A
3
N / A
4
Defrost Heater
120 VAC
Voltage present when
defrost heater is on
5
N / A
1
Air Door
2
Air Door
3
Compressor Drive
3 - 6 VDC
Measured at pins 3 & 8
4
Evap. Fan Feedback
N / A
5
Evap. Fan Constant
12 VDC
Measured at pins 5 & 9
6
Air Door
7
Air Door
8
Compressor Drive
3 - 6 VDC
Measured at pins 3 & 8
9
Evap. Fan Ground
Evap. GND
10
Evap. Fan Run Voltage
5 - 12 VDC Measured at pins 9 & 10
P 6
P 7
P 2
P 3
P 4
P 5
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