Lincoln 1451 Control transformer, Check for 120VAC supply to the primary of the control, follows

	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 - 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
		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,	NOTE: Display will indicate
but there is no speed	“BELT JAM”
display
	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.

Impinger I – 1450 Series Service Manual - Domestic 7