Hall Effect Sensor; Service Diagnostics And Procedures - Viking DSOE305T Service Manual

Service Diagnostics and Procedures

Hall Effect Sensor

The cooling motor incorporates a device called a
Hall Effect Sensor. The sensor is connected to the
main power board at PL4 (lower oven) and PU4
(upper oven). Below you will see the three wire
connectors to the Hall Effect Sensor, which consists
of a red (1), white (2), and black (3). The Hall Effect
Sensor is built into the cooling motor.
PU4
PU4
To check the cooling fan, verify the cooling fan
is operating. If the fan is not turning, then verify
power is being supplied to the motor as shown
on page 41. If the fan is running, locate the 3-wire
Molex plug on the relay board. With the oven
switched OFF, unplug the connector from the
board as shown above and set the voltmeter to DC
voltage.
A voltage of +5 volts should be read on the Main
relay board between the pin (1) red and pin (3)
black. Measure the voltage between pin (2) white
and pin (3) black and +5 volts should be measured
as well. Measure the voltage between pin (1) red
and pin (2) white and 0 volts should be measured.
If the voltages are not correct and there is 240
Voltages being supplied to the Relay board,
replacement of the relay board is
© 2010 Viking Preferred Service
necessary. If the voltages are correct, reconnect the
3-wire Molex plug. Place meter leads in pin (1) red
and pin (2) white.
Activate the oven so that the fan is energized. With
the fan turning, 2.5 VDC should be measured. If 2.5
VDC is present, then connect meter leads between
pin (2) white and pin (3) black. A voltage of 2.5 VDC
should be measured. If 2.5 VDC is not measured,
but a full 5 VDC is measured, then the Hall Effect
Sensor is defective and replacement of the cooling
fan is necessary.
Another test that can be made is with the oven
shut off and the Molex plug connected, place
PL4
meter leads between pin (1) red and pin (2) white.
With the voltmeter set to DC voltage, a reading
of 0 or 5 volts should be measured depending on
where the motor is positioned. If the motor is spun
manually the voltage should jump between 0 – 5
volts. The same is true if the meter leads are placed
between pin (2) white and pin (3) black. As the fan
is manually spun a voltage of 0 to 5 volts will be
measured. 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.
PL4
46