Lincoln II - Advantage Series service manual

	Speed Adjustment	This is a 0 to 10 K ohm, 1 turn potentiometer. With
	Potentiometer	power off, remove the black and white pot leads
		from the motor control board at terminals P1, P2.
		Place the meter leads on the black lead (P2) and on
		the white lead (P1). Rotating the pot., slowly, from
		low to high, the meter readings should show an even
		transition from 0 to 10 K ohms ± 5%. There should
		be no dead or open spots through out the 1 turn of
		the pot. Check both leads to ground. There should
		be no continuity to ground. If any of the above
		checks fail, replace the pot.
	DC Motor Control Board	Check for 120 VAC input to the control board at
		terminals L1 and L2. If not present, check wiring
		back to the oven fan switch. If 120 VAC is present
		at L1 and L2, check both fuses on control board (8A
		line and 1A armature), check the VDC output at
		terminals A+ and A-. If 120 VAC is present at
		terminals L1 and L2 and DC voltage is present at
		A+ and A-, but the 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
		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. Check
		motor brushes. From the top of the motor, rotate
		motor shaft to determine if there is a locked rotor or
		a locked gear box (use care so magnet and H.S.
		board are not damaged). Replace motor as needed.
	Conveyor	Check for any mechanical misalignment. Also,
		check for worn bearings. A conveyor belt that is
		over tightened will cause excessive bearing wear
		and sometimes, irregular speed.
Conveyor speed varying or	Power Supply	Check power supply at the DC control board for the
intermittent		120 VAC at board terminals L1 and L2.
	Motor Control Board	Place the test meter probes on terminals A+ and A-.
		(With speed potentiometer set to maximum speed
		(Approximately 2 min.) The meter reading should be
		approximately 100 VDC (±3%), if voltage is not
		steady within limits, then the board is probably bad.
		Always check the speed pot., be sure it is okay
		before changing a board. 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.
	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 11 under "possible cause" listing
		"conveyor gear motor."
	Magnet	Check to insure that the magnet (cemented to shaft
		of conveyor drive 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 motor.) Check all wiring
		and connections for damage. Check all connections
		for tightness or proper location and check all wiring
		for visible damage. Replace as needed. Connect
		new hall effect to system and check for steady
		operation.
Impinger II –Advantage Service Manual - Domestic		11