Lincoln 1100 Series control board. If 120 VAC is present at terminals, motor as follows, Conveyor

		control board. If 120 VAC is present at terminals
		L1 and L2, but DC Voltage is not present
		at A+ and A-, providing the fuses are good,
		replace the board. If 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 theconveyor. As described below under
		conveyor.Check the leads to the motor for
		evidence of any shorts or opens, and each lead
		to ground. Check motor brushes. Replace
		as needed. If themotor fails the above tests,
		replace motor. Remove the dust cover from the
		top of the motor and rotate motor shaft to deter
		mine if there is a locked rotor or a locked
		gear box (use care so encoder disc
		is not damaged).
	Conveyor	Check for any mechanical mis- alignment or i
		improper adjustment. Also check for worn
		bearings. TheInstallation and Operations Manual
		shows proper conveyor belt position. A conveyor
		belt that is too tight will contribute to excessive
		load, bearing wear, and wearing of slider bed
		rods.
Conveyor speed varying	Power Supply	Check power supply at the DC
or intermittent		control board for the 120 VAC ±
		10% at board terminals L1 and L2.If voltage is
		not present, trace wiring back to the power input,
		chck the main circuit breakers and call
S/N2011821& above		the power company if necessary.
Refer to page 45	Tach. generator and DC	With the power to the DC motor
	Motor Control Board	control board turned off, remove
		the leads from terminals T1 and T2.Place the
		test leads of a digital test meter on the tach.
		leads, turn power on, and the meter reading
		should be approximately 20 to 25 VDC. This
		reading is normally steady within ±
		0.2 to 0.3 VDC.
		If this reading is not within required VDC,
		place the test meter probes on terminals A+
		and A-. The meter reading should be ap
		proximately 150 to 160 VDC and steady
		within approximately 2 to 3 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

Impinger II - 1100 Series Service Manual - International 31