Lincoln 1450 - Manual (Page 7)

Impinger I – 1450 Series Service Manual - Domestic 7
Control transformer Check for 120VAC supply to the primary of the control
transformer. If no voltage is present, trace wiring back
to the oven power switch. If voltage is present, check
foe 24VAC at the transformer secondary. If there is
primary voltage, but no secondary voltage, replace
control transformer.
Conveyor motor Check for 120VAC supply to conveyor motor at wire #6
to neutral. If no voltage is present, trace wiring back to
oven power switch. If voltage is present and motor will
not run, check the motor windings for opens or shorts.
WITH POWER OFF: Check the motor windings as
follows:
Grey to black - 38
Ω approx.
Grey to blue - 38 Ω approx.
Blue to black - 75 Ω approx.
If any of the above fails, replace 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 as
needed.
Oven control If there is 120VAC 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
display
NOTE: Display will indicate
“BELT JAM”
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 approx. 10VDC. If no voltage is
present, trace wiring back to oven control. If there is no
voltage present at the oven control, replace the 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 at the motor connector. Frequency reading
should be approx. 25 – 100 Hz. If these readings are
not achieved, replace conveyor motor. If these readings
are achieved, proceed.
Oven control If the hall effect sensor readings are correct, but there
is no speed indicated on the display, replace the oven
control.