Main Control Board - KitchenAid 2003 M Technical Education

Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.

MAIN CONTROL BOARD

Refer to page 4-9 for the procedure for servicing the main control board.
NOTE: See the chart for the main control board test specifications.
P2
DISPLAY BOARD
P3
THERMISTORS
P4
INPUTS
P5
120 VAC SUPPLY
Electrical Shock Hazard
PLUG PIN # DESCRIPTION
1 Communication Line
P2 2 Display Voltage
P7
3
OUTPUTS
1 Ref. Thermistor
2 Frz. Thermistor
P3
3 Ref. Thermistor Output
4 Frz. Thermistor Output
1 Ref. Door Sw Enable
2 Frz. Door Sw Enable
3
P6
OUTPUTS
4 Ref. Door Input
5 Ice Maker Valve Input
P 4
6 Dispenser Valve Input
7
8
1
2
P5 3
4
5
1
2
3
P6
4 Defrost Heater
5 Ice Maker Enable
1
2
3 Compressor Drive
4 Evap. Fan Feedback
5 Evap. Fan Constant
P7
6
7
8 Compressor Drive
9 Evap. Fan Ground
10 Evap. Fan Run Voltage
5-5
OUTPUT
N / A
12 VDC
Measured at pins 2 & 3
GND GND
GND
GND
5 VDC
Measured at pins 1 & 3
5 VDC Measured at pins 2 & 4
120 VAC
120 VAC
N / A
Voltage present when door
120 VAC
is open
Voltage present when ice
120 VAC
maker is energized
Voltage present when
120 VAC
dispenser valve is energized
Voltage present when
Bimetal Input 120 VAC
bimetal is closed
Frz. Door Input 120 VAC
AC GND AC GND
AC L1 120 VAC
AC Neutral AC Neutral
AC Neutral AC Neutral
AC L1 120 VAC
Voltage present when
Condenser Fan 120 VAC
condenser fan is on
N / A
N / A
Voltage present when
120 VAC
defrost heater is on
Voltage present when I/M
120 VAC
bail arm is down & I/M is
active
Air Door
Air Door
3 - 6 VDC
Measured at pins 3 & 8
N / A
12 VDC Measured at pins 5 & 9
Air Door
Air Door
3 - 6 VDC
Measured at pins 3 & 8
Evap. GND
5 - 12 VDC Measured at pins 9 & 10
CONDITION