Lincoln 1100-000-A SERIES (SN 2038615 & BELOW) service manual

		most of the problems listed under “Oven will
		not heat” can cause intermittent failure.
Conveyor will not run	Power supply	Check incoming power supply, If no voltage is
		present, check circuit breakers.
	Fan switch	With power off, Check continuity between
		switch terminals. Replace as needed.
	Speed adjustment	This is a 0 to 10K ohm, 1 turn potentiometer.
	potentiometer	With power off, remove the black and white
		pot. leads from the motor control board at
		terminals P1 and P2. Place the meter leads on
		the black and white pot. leads. Rotating the
		pot. slowly, from low to high, the meter reading
		should show an even transition from 0 to 10K
		ohms ± 5%. There should be no dead or open
		spots throughout the rotation of the
		potentiometer. Check both pot. leads to
		ground. There should be no continuity to
		ground. If any of the above checks fail, replace
		the potentiometer.
	DC motor control board	Check for supply voltage input to the control
		board at terminals L1 and L2. If voltage is not
		present, check wiring back to the oven fan
		switch. If supply voltage is present, check both
		fuses on control board (8A line and 1A
		armature). Check the DC voltage output at
		terminals A+ and A-. If there is power in to the
		control board but no power at A+ and A-, check
		the following:
	Hall effect sensor	Disconnect the Hall effect sensor from the DC
		motor control board. If the motor begins to run,
		replace the Hall effect sensor.
	DC motor control board	If, after disconnecting the Hall effect sensor,
		the motor is still not running, check for DC
		voltage from terminals A+ and A-. If there is no
		DC voltage, replace the DC motor control
		board.
	Circuit breaker	If there is DC voltage output from the DC motor
		control board, but the motor is still not running,
		check the 0.4 Amp circuit breaker. Disconnect
		wires from the circuit breaker and check for
		continuity through the circuit breaker. Reset
		circuit breaker or replace as needed.
	Conveyor gearmotor	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. Rotate motor shaft to determine if there
		is a locked rotor or a locked gearbox (use care
		so that magnet and sensor are not damaged).
		Check motor brushes for damage or excessive
		wear, replace brushes if needed. Replace
		motor if needed. Also check to be sure that the
		conveyor drive coupling is tight and properly
		engaged to the conveyor shaft.
	Conveyor	Check for any mechanical misalignment. Also,
		check for worn bearings. A conveyor belt that is
		too tight may cause excessive bearing wear
		and sometimes, irregular speed.
Conveyor speed unsteady	Power supply	Check power supply at the DC motor control
		board for supply voltage at terminals L1 and
		L2. Supply voltage should be steady.
Impinger II – 1100-000-A Series (SN 2038615 & Below) Service Manual –Int’l			9