Viking vdsc530t Service Manual page 68

Service Diagnostics and Procedures–Disassembly
To avoid risk of electrical shock, personal injury, or death, disconnect electrical power to unit using power
switch before servicing. Wires removed during disassembly must be replaced on proper terminals to insure
correct earth ground and polarization. After servicing, reconnect power using power switch.
Hall Effect Sensor (cont.)
If the voltages are correct, reconnect the 3-wire
Molex plug. Place your meter leads into pin (1)
black and pin (2) white. Activate the oven or the
diagnostic program so that the fan is energized.
With the fan turning, you should be reading
2.5 volts DC. If yes, then connect your meter
between pin (2) white and pin (3) red. Again you
should read 2.5 volts DC. If you do not read
2.5 volts but a full 5 volts DC, then the Hall Effect
Sensor is defective and the fan motor (with
sensor) will need to be replaced.
Another test that can be made is with the oven shut
off and the Molex plug connected, place your meter
leads into pin (1) black and pin (2) white. Set your
meter to DC Volts. You will read either 0 or 5 volts,
depending on where the motor is positioned. If you
manually spin the motor you will see the meter jump
between 0-5 volts. The same is true if you were to
place your meter leads in pin (2) white and pin (3)
red. As you manually spin the fan you will see 0 or
5 volts. Therefore, in any position, one side will read
0 volts while the other will read 5 volts. This is a
good test to see that the three wire cable and hall
effect sensor has closed contacts.
© 2010 Viking Preferred Service
WARNING
68