Lincoln 1200 Conveyor Gear Motor, the conveyor. Refer to the next possible cause, damaged, speed

	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. If the
		motor fails the above tests, replace motor. Remove
		dust cover from the top of the motor and rotate
		motor shaft to determine if there is a locked rotor or
		a locked gear box (use care so encoder disc is not
		damaged).
	Conveyor	Check for any mechanical misalignment or
		improper adjustment. Also check for worn
		bearings. The Installation and Operations Manual
		shows proper conveyor belt adjustment. A
		conveyor belt that is over tightened will cause
		excessive bearing wear and sometimes, irregular
		speed.
Conveyor speed	Power Supply	Check power supply at the DC control board for the
varying or intermittent		120 VAC at board terminals L1 and L2. If voltage is
		not present, check main circuit breakers.
	Tach generator and DC Motor	With the power to the DC motor control board
	Control Board	turned off, remove the leads from terminals T1 and
		T2.Place the test leads of a digital meter on the
		tach leads, turn power on, and the meter reading
		should be approximately 30 to 35 VDC. This
		reading should be steady within ± 0.2 to 0.3 VDC.
		If this reading is not within + 0.5 VDC, place the
		test meter probes on terminals A+ and A-. The
		meter reading should be approximately 150 to 160
		VDC and steady within approximately 2 VDC. If the
		tach. voltage is unsteady, and the board output is
		steady, check the coupling for loose set screws or
		any type of damage. If the coupling checks good,
		the tach. is usually bad. If the board voltage output
		is unsteady beyond limits, then the board is
		probably bad. Always check the speed pot. Be sure
		it is okay before changing a board or tach. 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.
		Readjustment should always be attempted at least
		once before replacement. See procedure for board
		adjustment on page 44.
	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 27 under "possible
		cause" listing "Conveyor gear motor".
Conveyor will not	Voltage Supply	Check incoming voltage supply at Line 1 to neutral.
run(S/N Q19078 &		There should be a voltage reading of 120 VAC.
Up1000 Series) (S/N	Fan Switch	See procedure for checking on page 20.
Q14791 & Up1200	Conveyor Switch	Check for 120 VAC to conveyor switch. If no
Series)		voltage is present, trace wiring back to the fan
		switch. WITH POWER OFF: Check continuity
		between switch terminals.
	Conveyor Fuse (3A)	Check, replace if necessary.
	Fuseholder	Check, replace if necessary.

28 Impinger I -–1000 Series Service Manual - Domestic