Lincoln 1000 Conveyor ControlStepper, Check for 120 VAC supply to primary of, Transformer, Motor

	Conveyor Control(Stepper)	Check for 120 VAC supply to primary of
	Transformer	transformer, if voltage is not present, trace wiring
		back to the fuse-holder. If voltage is present, check
		for output voltage from the transformer secondary.
		NOTE: this control transformer outputs (2)
		secondary voltages. Red Leads 29 VAC Brown
		Leads 10 VAC If BOTH secondary voltages are not
		present, replace the transformer.
	Speed Adjustment	This is a 0 to 50k ohm,10 turn potentiometer. WITH
	Potentiometer	POWER OFF: remove the 3 pin potentiometer
		cable plug from the motor control board. With a
		digital multimeter, check the ohm reading across
		the red lead to the black lead, this reading should
		be 50k ohms ± 5% as the potentiometer is rotated
		through its 10 turn rotation. Place the meter leads
		on the red lead and white lead. Rotating the
		potentiometer slowly, from low to high, the meter
		should show an even transition from 0 to 50K ohms
		± 5% through the 10 turn rotation of the
		potentiometer. There should be no dead or open
		spots through the 10 turns of the potentiometer.
		Check all three leads to ground. There should be
		no continuity to ground. If any of the above checks
		fail, replace the potentiometer.
	Conveyor Motor(Stepper)	NOTE: if the conveyor drive motor becomes
	Control	jammed or begins to run at an uncontrolled speed,
		the conveyor motor will stop running. To reset, turn
		off the conveyor switch, wait 10 seconds, turn the
		conveyor switch on. If the motor does not run after
		attempting re-set, check for 2-29 VAC across the
		motor terminals 1 to 2 and 3 to 5 on the conveyor
		motor control. If voltage is not present at both sets
		of terminals, replace control
	Conveyor Drive (Stepper)	Check the drive sprocket on motor out-put shaft to
	Motor	insure that it is tight.. Check motor windings –
		measurements should be approximately 2 ohms.
		Terminal 1-5, 2-6, 3-7, 4-8 WITH POWER OFF:
		Turn the motor shaft to check for jammed gear box.
		If motor shaft will not turn, replace conveyor
		drive(stepper) motor.
Time/Temp Display	12.6 VAC Power Supply	Measure the transformer primary inoperative for a
		nominal 120 VAC input. Measure the secondary
		voltage output which will be 12.5 to 15 VAC
		normally. Recheck secondary output at rear of
		Time/Temp Display. Terminals 1 to 3 should read
		12.5 to 15 VAC. Terminals 1 to 2 and 2 to 3 should
		be exactly 1/2 of the reading across 1 to 3. If you
		do not get the above secondary readings, replace
		the transformer. If 120 VAC primary voltage is not
		available, refer to the schematic and trace circuit
		for incoming power failure. There is a 4 amp fuse in
		each red secondary lead. These may be jumpered
		(for test only) to determine if they are defective or
		intermittent.
NOTE:	(Dual Belt Ovens)	Dual belt ovens utilize a double pole double throw
		switch, which allows either of the optical encoders
		to be read from a single Time/Temp. Display.
		Check switch and replace as needed.

Impinger I -–1000 Series Service Manual - Domestic 29