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Impinger II – Advantage Digital Express Service Manual - Domestic
14
Oven control If the thermocouple checks good, but the oven
control display indicates that there is a thermocouple
failure, replace the oven control. If the oven control
indicates a temperature reading but the oven won’t
heat, proceed.
Thermocouple WITH POWER ON AND THERMOCOUPLE
ATTACHED TO THE OVEN CONTROL: Measure
the DC millivolt output of the thermocouple. Refer to
the thermocouple chart (located in the “Removal”
section of the manual) for proper millivolt readings. If
these readings are not achieved, replace
thermocouple.
Oven control If the thermocouple checks good, but there is no
120VAC output to the temperature regulation valve,
replace the oven control. If there is 120VAC output to
the temperature regulation valve, proceed.
Temperature regulation valve Check for 120VAC supplied to temperature
regulation valve. If voltage is present, listen for valve
to open and close. Also check for opens or shorts in
the operating coil. Replace temperature regulation
valve as needed.
Intermittent heating Thermal/overload of main fan
and burner blower motors
The main fan motor and burner blower motor are
equipped with internal thermal protection and will
cease to operate if overheating occurs. As the
motors overheat and then cool, 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 problems listed under “Oven will not heat” can
cause intermittent failure.
Conveyor will not run Power supply Check for incoming voltage at line 1 to neutral. There
should be a reading of 120VAC. If not present, check
circuit breakers.
Fuse, 10 Amp Check, replace if necessary.
Fuse holder Check, replace if necessary.
Hi-limit thermostat, control box Check for voltage on both sides of switch. Terminals
are normally closed. If open, reset and test oven for
proper operation. If thermostat will not hold, and
control box temperature is not exceeding 140°F
(60°C), replace thermostat.
Power switch Check continuity between switch terminals. Replace
switch as needed.
Control transformer Check for 120 VAC supply 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.
Conveyor motor Check for 120 VAC supply to the conveyor motor at
wire #14 to neutral. 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 - 38Ω approx.
Grey to blue - 38Ω approx.
Blue to black - 75Ω approx.
If any of the above fails, replace conveyor motor.
Capacitor, conveyor motor Check for shorts or grounds. Replace capacitor as