Component Testing; Component Testing-Control Board - Viking RDDFF236 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, a secondary 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 and secondary control boards access procedure, page 52 and control board
access procedure, page 32), 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
© 2012 Viking Preferred Service
WARNING
Test point
P3-3 (Brown) – P1-2 (White)
P1-1 (Red) – P4-3 (Black)
P1-1 (Red) – P5-1 (Red/Orange)
P3-3 (Brown) – P5-6 (Orange)
P5-5 (Blue/Red) – P1-2 (White)
P3-1 (Black/Yellow) – P1-2 (White)
P3-2 (Yellow/Red) – P1-2 (White)
P3-1 (Black/Yellow) – P3-3 (Brown) Defrost
Thermostat closed
P1-1 (Red) – P1-2 (White)
P6-3 (Yellow) – P6-8(Yellow)
P5-5 (Blue/Red) – P1-2 (White)
P6-6 (White/Blue) – P6-1 (White/Orange)
P6-7 (White/Yellow) – P6-1 (White/Orange) 2.38K Ω
P6-9 (White/Violet) – P6-1 (White/Orange)
P6-6 (White/Blue) – P6-9 (White/Violet)
P1-4 (Blue) – P1-2 (White)
P1-4 (Blue) – P1-2 (White)
P5-1 (Red/Orange) – P1-1 (Red)
P1-2 (White)
P7-9 (Blue/White) – P7-10 (Red/Black)
P7-9 (Blue/White) – P7-10 (Red/Black)
P10-1 (Red/Black) – P10-2 (Black/Green)
P8-2 (Yellow/Black) – P8-3 (Black/Green)
P8-3 (Black/Green)
Green/Yellow
Reading
55.7K Ω
1M Ω
24.7 Ω
55.7K Ω
1.4M Ω
1M Ω
–
55.8K Ω
100M Ω
20K Ω
∞ Ω
2.38K Ω
2.38K Ω
4.5K Ω
3.9 Ω
3.9 Ω
3.2M Ω
–
24.5 Ω
24.5 Ω
5.6K Ω
–
–
–
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