© 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
34.8
1
Refrigerator Light Switch
CN 6-2
22.4M
1
Freezer Light and NC Freezer Light Switch
CN 6-1
21.3M
1
Defrost Terminator
CN 2-10
0
1'
Damper Motor
CN 2-9
22M
1
Evaporator Fan
CN 2-8
26M
1
Common Damper Motor
CN 2-5
–
Evaporator Fan and Defrost Heater
CN 2-4
22M
1
Ice Maker
CN 2-3
202
1
Water Dispenser Switch
CN 2-2
0
1
at rest
'1
dipressed
Normally Closed Motorized Damper
CN 2-1
200M
1
Fresh Food Thermistor
CH 3-1
2.93K
1
Freezer Thermistor
CH 3-2
3.00K
1
Ambient Thermistor
CH 3-3
2.9K
1
Freezer Thermistor and Ambient Thermistor
CH 3-4
3K
1
Condenser Fan Motor and PTC Overload Relay
CN 1-4
50M
1
Condenser Fan Motor and PTC Overload Relay
CN 1-3
50M
1
Common Freezer Light Switch
CN 1-2
192K
1
Power Cord (Neutral)
CN 1-1
–
Mullion Heater
CN 8-1
28M
1
Mullion Heater
CN 8-2
28M
1
+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.