Lincoln 1100 Series service manual experienced, such as a rolling of

		experienced, such as a rolling of
		numbers, or lock-up at a given number,
		first check for a display circuit lock-up. This may be
		caused by a voltage
		spike or surge in the incoming power
		lines. To eliminate this condition,
		remove power from the time/temp
		display by shutting off the main fan
		switch for 15 seconds. This should
		eliminate the problem. If this does not
		solve the problem, it may becoming in
		through the Commercial power lines.
		Suggest that customer contact their
		power company for evaluation.
Temp display inaccurate,	Time/Temp Display	Perform the power supply check, the
erratic, or inoperative		thermistor probe check, and then
		perform the time/temp simulator test.
		Refer to Section D for instructions.
		Remember, when using the time/temp
		simulator, remove all leads from the
		back of the time/temp display except the
		3 power leads.
		After completion of the test, and if re-
		installing time/temp display back in the
		oven, the dip switches must be reset for
		oven operation, and the time/temp
		display must be recalibrated. If
		readings are not achieved, replace
		display.
Time Display inaccurate,		Perform all checks as in the above
erratic, or inoperative		evaluation. If the time check is okay,
		refer to the next section.
	Conveyor Drive	Check to see if the conveyor drive
	(Stepper) Motor	(stepper) motor is running. If motor
		is not running, refer to “Conveyor will
		not run” on Page 45.
	Magnet	Check to insure that the magnet
		(cemented to shaft of conveyor drive
		[stepper] 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 [stepper] motor). Check all
		wiring and connections for damage.
		If the motor is running, the magnet is
		in place, but the display shows”—:—”
		the Hall Effect Sensor may be defective
		or improperly connected.
	Conveyor Drive	Check all connections for tightness or
	(Stepper Control)	proper location and check all wiring
		for visible damage. Replace as needed.
		If there is still no time display and all
		the above have checked out, replace the
		stepper control.
46		Impinger II - 1100 Series Service Manual - International