Lincoln 1117-000-A Speed Adjustment, Potentiometer, above checks fail, replace the pot, needed

	Speed Adjustment	This is a 0 to 10 K ohm, 1 turn potentiometer. With
	Potentiometer	power off, remove the black and white pot leads
		from the motor control board at terminals P1, P2.
		Place the meter leads on the black lead (P2) and
		on the white lead (P1). Rotating the pot., slowly,
		from low to high, the meter reading should show an
		even transition from 0 to 10 K ohms ± 5%. There
		should be no dead or open spots through out the 1
		turn of the pot. Check both leads to ground. There
		should be no continuity to ground. If any of the
		above checks fail, replace the pot.
	DC Motor Control Board	Check for 208/240 VAC input to the control board at
		terminals L1 and L2. If not present, check wiring
		back to the oven fan switch. If voltage is present at
		L1 and L2, check both fuses on control board (8A
		line and 1A armature), check the VDC output at
		terminals A+ and A-. If voltage is present at
		terminals L1 and L2, and DC voltage is present at
		A+ and A-, but motor does not run, check gear
		motor as follows.
	Conveyor Gear Motor	If DC voltage is present at A+ and A- and the motor
		does not run, first check the mini breaker and then
		the conveyor. Refer to the next possible cause.
		Check the leads to the motor for evidence of any
		shorts or opens, and each lead to ground. Check
		motor brushes. From the top of the motor, rotate
		motor shaft to determine if there is a locked rotor or
		a locked gear box (use care so magnet and H.S.
		board are not damaged). Replace motor as
		needed.
	Conveyor	Check for any mechanical misalignment. Also
		check for worn bearings. A conveyor belt that is
		over tightened will cause excessive bearing wear
		and sometimes, irregular speed.
Conveyor speed varying or	Power Supply	Check power supply at the DC control board for the
intermittent		208/240 VAC at board terminals L1 and L2.
	Motor Control Board	Place the test meter probes on terminals A+ and A-.
		(With speed potentiometer set to maximum speed
		(Approximately 2 minutes), the meter reading
		should be approximately 100 VDC (± 3%), if voltage
		is not steady within limits, then the board is
		probably bad. Always check the speed pot. Be
		sure it is okay before changing a board. This test is
		not always 100% accurate as this test is not
		performed at operating speeds. However, this test
		is the best method currently available.
	DC Gearmotor	If the DC control board is steady, then the problem
		may be the motor or gearbox. Check the brushes
		in the motor for excessive arching and/or unusual
		wear. Check the motor and gearbox from
		instruction located on page 14 under "possible
		cause" listing "conveyor gear motor."
	Magnet	Check to insure that the magnet (cemented to shaft
		of conveyor drive motor) has not been damaged, or
		come loose from motor shaft. Replace as needed.

Impinger II –Advantage Service Manual - Domestic 15