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

	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.
	Magnet	Check to insure that the magnet (cemented to
		shaft of conveyor drive motor) has not been
		damaged, or come loose from the motor shaft.
		Re-glue or 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.
		Replace as needed.
	Hall effect sensor cable	Check continuity through the wires in the cable.
		Check all wiring and connections for visible
		damage. Replace as needed.
	DC motor control board	With motor running, measure DC voltage
		across the red wire and black wire in the hall
		effect cable (all wires must be connected
		during this test). Voltage reading should be
		approx. 12VDC and steady. If this reading is
		not achieved, replace DC motor control board.
	Hall effect sensor	With the motor running at maximum speed,
		measure the frequency across the white wire
		and the black wire in the hall effect cable (all
		wires must be connected during this test).
		Reading should be approx. 327 Hz. And
		steady. If there is no reading, replace hall effect
		sensor. If the reading is unsteady, calibrate the
		DC motor control board.
Temperature display	Display transformer	Measure the transformer primary for supply
inoperative		voltage input. If voltage is not present, trace
		wiring back to the oven fan switch. Measure
		the secondary output, which will normally be
		12-15VAC. Voltage across terminals 1-3
		should be 12-15VAC. Terminals 1-2 and 2-3
		should be ½ the voltage reading 1-3. If the
		above secondary readings are not achieved,
		replace transformer.
	Temperature display	If proper voltage is present at terminals 1,2 and
		3 on temperature display, but the display is not
		lighted, recheck all connections for tightness. If
		temperature display is still not operating,
		replace the temperature display.
Temperature display	Thermocouple	Place the thermocouple of a pyrometer into the
inaccurate, or erratic		center of the top finger. The pyrometer will
		indicate oven temperature. Measure DC
		millivolts of thermocouple at the temperature
		display. See thermocouple chart in “Removal
		and Installation” section for proper readings.
		Replace thermocouple if proper readings are
		not achieved. If readings are correct on the
		thermocouple, recalibrate or replace

10 Impinger II – 1100-000-A Series (SN 2038615 & Below) Service Manual –Int’l