Component Testing Control Boards - Viking VCBF136 Service Manual

Service Diagnostics and Procedures
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.
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
Defrost Terminator and Defrost Heater
Refrigerator Light Switch
Freezer Light and NC Freezer Light Switch
Defrost Terminator
Damper Motor
Evaporator Fan
Common Damper Motor
Evaporator Fan and Defrost Heater
Ice Maker
Water Dispenser Switch
Normally Closed Motorized Damper
Fresh Food Thermistor
Freezer Thermistor
Ambient Thermistor
Freezer Thermistor and Ambient Thermistor
Condenser Fan Motor and PTC Overload Relay
Condenser Fan Motor and PTC Overload Relay
Common Freezer Light Switch
Power Cord (Neutral)
Mullion Heater
Mullion Heater
+14 VDC Display PC Board
Wide Display PC Board
Dig Ground PC Board
Compound Ground and Base Pan Ground
© 2011 Viking Preferred Service
WARNING
Test Point Reading
CN 6-3 34.8
CN 6-2 22.4M
CN 6-1 21.3M
CN 2-10 0
CN 2-9 22M
CN 2-8 26M
CN 2-5 –
CN 2-4 22M
CN 2-3 202
CN 2-2 0 at rest
CN 2-1 200M
CH 3-1 2.93K
CH 3-2 3.00K
CH 3-3 2.9K
CH 3-4 3K
CN 1-4 50M
CN 1-3 50M
CN 1-2 192K
CN 1-1 –
CN 8-1 28M
CN 8-2 28M
CN 4B-1 +14VDC
CN 4B-2 –
CN 4B-3 –
P1 –
dipressed
25