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Intermittent heating
Conveyor will not run
Conveyor motor runs, but
there is no speed display
Impinger II – Advantage Digital Express Service Manual - Domestic
Thermal/overload of motor
Power supply
Fuse, 10 Amp
Fuse holder
Hi-limit thermostat, oven cavity Terminals are normally closed. If open, reset
Power switch
Control transformer
Conveyor motor
Capacitor, conveyor motor
Switch, conveyor reversing
Oven control
NOTE: Display will indicate
"Belt Jam"
Oven control
closed position. If there is no voltage to the
operating coil, but there is high voltage at the
contactor output, replace the mercury contactor.
The main fan motor is equipped with internal
thermal protection and will cease to operate if
overheating occurs. As the motor overheats and
then cools, this will cause the oven to cycle on and
off intermittently. Improper ventilation or lack of
preventive maintenance may cause this. Also,
most of the problems listed under "Oven will not
heat" can cause intermittent failure.
Check circuit breakers, reset if required. Check
power plug to be sure it is firmly in receptacle.
Measure incoming power, call power co. if
needed.
Check, replace if necessary.
Check, replace if necessary.
thermostat and retest. If thermostat will not hold
for maximum oven temperature, and oven is not
exceeding temperature setting, check for proper
location of capillary bulb in its spring holder. If the
capillary checks okay, replace the hi-limit
thermostat.
Check continuity between switch terminals.
Replace switch as needed.
Check for supply voltage to the primary of the
control transformer. If no voltage is present, trace
wiring back to the oven power relay. If voltage is
present, check for 24 VAC at the transformer
secondary. If there is primary voltage but no
secondary voltage, replace control transformer.
Check for supply voltage to the conveyor motor. If
no voltage is present, trace wiring back to the
primary of the control transformer. If voltage is
present and the motor will not run, check the
motor windings for opens or shorts.
WITH POWER OFF: Check the motor windings as
follows:
Grey to black - 240Ω approx.
Grey to tan
- 240Ω approx.
Tan to black - 480Ω approx.
If any of the above fails, replace conveyor motor.
Check for shorts or grounds. Replace capacitor as
needed.
WARNING: Capacitor has a stored charge,
discharge before testing.
Check continuity between switch terminals.
Replace switch as needed.
If there is supply voltage to the motor, and the
motor, capacitor, and reversing switch check
good, replace the oven control.
Check for output voltage from oven control to hall
effect sensor (sensor is located in conveyor
motor). Measure voltage at the motor connector,
red wire and yellow wire. Voltage should be
19
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