© 2011 Viking Preferred Service
25
Service Diagnostics and Procedures
Component Testing
The unit has a main control board and UI (dispenser) board that control functions of the respective
refrigerator/freezer compartment. Components can be diagnosed via these boards. With the board accessed
(refer to main control board access procedure, page 51 and control board access procedure, page 31), the
following can be measured:
Component Testing–Control Board
Component Test Point Reading
Defrost Terminator and Defrost Heater CN 6-3 34.81
Refrigerator Light Switch CN 6-2 22.4M1
Freezer Light and NC Freezer Light Switch CN 6-1 21.3M1
Defrost Terminator CN 2-10 01'
Damper Motor CN 2-9 22M1
Evaporator Fan CN 2-8 26M1
Common Damper Motor CN 2-5 –
Evaporator Fan and Defrost Heater CN 2-4 22M1
Ice Maker CN 2-3 2021
Water Dispenser Switch CN 2-2 01 at rest '1 dipressed
Normally Closed Motorized Damper CN 2-1 200M1
Fresh Food Thermistor CH 3-1 2.93K1
Freezer Thermistor CH 3-2 3.00K1
Ambient Thermistor CH 3-3 2.9K1
Freezer Thermistor and Ambient Thermistor CH 3-4 3K1
Condenser Fan Motor and PTC Overload Relay CN 1-4 50M1
Condenser Fan Motor and PTC Overload Relay CN 1-3 50M1
Common Freezer Light Switch CN 1-2 192K1
Power Cord (Neutral) CN 1-1 –
Mullion Heater CN 8-1 28M1
Mullion Heater CN 8-2 28M1
+14 VDC Display PC Board CN 4B-1 +14VDC
Wide Display PC Board CN 4B-2 –
Dig Ground PC Board CN 4B-3 –
Compound Ground and Base Pan Ground P1 –
WARNING
To avoid risk of electrical shock, personal injury, or death, disconnect electrical power to unit using power
switch before servicing. After servicing, reconnect power using power switch.
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