Lincoln 1600 Conveyor speed, Power Supply, varying or intermittent, at board terminals L1 and L2

Conveyor speed	Power Supply	Check power supply at the DC control board for the 120 VAC
varying or intermittent		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
		min.) 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 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.
	Hall Effect Sensor	Check for any physical damage to hall effect sensor (mounted
		on conveyor drive motor.) Check all wiring and connections
		for damage. Check all connections for tightness or proper
		location. Replace as needed. Connect new hall effect to
		system and check for steady operation.

8 Low Profile – 1600-000-A Advantage Series Service Manual – Domestic