Impinger II – Advantage Digital Express Service Manual - International
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individual elements for opens, shorts and proper
resistance.
WITH POWER OFF; To check resistance of the
elements, remove all leads from the elements and use
a digital multimeter.
The element resistance should be as follows:
230V – 33 ohm.
Replace heating elements as needed.
Oven heats with
switch off
Contactor
The contactor has probably failed in the closed position.
If there is no voltage at the operating coil, but there is
high voltage output from the contactor, replace the
contactor.
Intermittent heating
Thermal/overload of
main fan motor
The main fan motor is equipped with internal thermal
protection and will cease to operate if overheating
occurs. As the motor overheats and cools, this will
cause the heating system to cycle on and off
intermittently. Improper ventilation or lack of preventive
maintenance may cause this problem. Also, most of the
problem listed under “Oven will not heat” can cause
intermittent failure.
Conveyor will not run
Display reads “belt jam”
Incoming power supply
Check breaker, reset if required. Check power plug to
be sure it is firmly in receptacle. Measure incoming
power, call power co. if needed.
Fuse, 10 amp
Check, replace if necessary.
Fuse holder
Check, replace if necessary.
Switch, main fan
With power off, check continuity between switch
terminals. Replace as needed.
Control transformer
Check for supply voltage to the primary of control
transformer. If no voltage is present, trace wiring back
to oven fan switch. If voltage is present, check for
24VAC at transformer secondary. If there is primary
voltage, but no secondary voltage, replace control
transformer.
Conveyor motor
Check for supply voltage to the conveyor motor at wire
#10 to neutral. If no voltage is present, trace wiring
back to the oven fan switch. If voltage is present, but
the motor will not run, check the motor windings for
opens or shorts. If any of the above fail, replace the
conveyor motor.
Capacitor, conveyor motor
Check for shorts or grounds. Replace capacitor as
needed.
WARNING: Capacitor has a stored charge, discharge
before testing.
Switch, conveyor reversing
Check continuity between switch terminals. Replace
switch as needed.
Oven control
If there is voltage supplied to the motor, and the motor,
capacitor and reversing switch check good, replace the
oven control.
Conveyor motor runs,
but there is no speed
control
Oven control
Check for output voltage from oven control to hall effect
sensor (sensor is located in the conveyor motor).
Measure voltage at the motor connector, red wire and
yellow wire. Voltage should be approx. 10VDC. If no
voltage is present, trace wiring back to oven control. If
there is no voltage output at the oven control, replace
oven control.
Conveyor motor
If there is voltage supplied to the hall effect sensor,
check for a frequency output from the hall effect sensor.
Measure frequency across the yellow and white wires in
the motor connector. Frequency reading should be
approx. 25-100 Hz. If these readings are not achieved,
