February 1998
17
12074208
Electronic Functional Description
To avoid electrical shock which can cause severe personal injury or death, disconnect power to refrigerator
using power switch before servicing. Wires removed during disassembly must be replaced on proper
terminals to insure correct earthing and polarization. After servicing, reconnect power using power switch.
WARNING
Refrigeration and Defrost Component Checks Made at High Voltage Board
Low voltage board input
W1 to D11
approximately
-25 VDC
High voltage board input
E10 to E9 (Neutral) or ground
approximately
120 VAC
Compressor/condenser fan motor
“ON” = E4 to E9 (Neutral) ground
approximately
120 VAC
“OFF” = E4 to E9 (Neutral) or ground
Compressor/condenser fan motor
“CLOSED” = R7 to ground
approximately
-11 VDC
relay
“OPEN” = R7 to ground
approximately
-25 VDC
Evaporator fan motor relay
“CLOSED” = R8 to ground
approximately
-11 VDC
“OPEN” = R8 to ground
-25 VDC
Evaporator fan motor
“ON” = E2 to E9 (Neutral) or ground
approximately
120 VAC
“OFF” = E2 to E9 (Neutral) or ground
0 VAC
Defrost heater
“ON” = E6 to E9 (Neutral) or ground
approximately
120 VAC
“OFF” = E6 to E9 (Neutral) or ground
0 VAC
Defrost heater relay
“CLOSED” = R9 to ground
approximately
-11 VDC
“OPEN” = R9 to ground
approximately
-25 VDC
Defrost terminator
“CLOSED” = E5 to E9 (Neutral) or ground
approximately
120 VAC
“OPEN” = E5 to E9 (Neutral) or ground
0 VAC
DC fan output voltage from
“ON” = E1 to ground
approximately
-25 VDC
high voltage board to fresh food fan
“OFF” = E1 to ground
0 VDC
or condensate evaporation fan
DC fan input voltage
“ON” = R10 to ground
approximately
-11 VDC
Signal to high voltage board from
“OFF” = R10 to ground
approximately
-25 VDC
low voltage board for
fresh food fan and for consendate
evaporation fan
Filament voltage at pins 11 and 12 = less than 5 VAC
