Lincoln 1633-000-EA as needed, Temperature regulation, If supply voltage is present on the, valve

		as needed.
	Temperature regulation	If supply voltage is present on the
	valve	temperature control board at the load
		terminals #7 and #8, check for voltage
		at temperature regulation valve. If
		voltage is present, listen for valve to
		open and close. Also, check for opens
		or shorts in the coil. Replace if required.
Intermittent heating	Thermal overload of	The main fan motors and the burner
	main fan and burner	blower motors are equipped with
	blower motors	internal thermal protection and will
		cease to operate if overheating occurs.
		As the motors overheat and then cool,
		this will cause the units to cycle on
		and off intermittently. This may be
		caused by improper ventilation or lack
		of preventive maintenance. Also, most
	of the problems listed under “Oven
		will not heat” can cause intermittent
		failure.
Conveyor will not run	Power supply	Check for supply voltage at terminals
		L1 and L2. If voltage is not present,
		check breakers.
	Fan switch	See procedure for checking on page 6.
	Fuse, 10 Amp.	Check and/or replace.
	Fuse holder	Check and/or replace.
	Filter E.M.I.	Check for supply voltage input to
		filter. If there is no voltage, trace wiring
		back to relay. If there is input voltage,
		check for output voltage. If there is
		input voltage but no output voltage,
		replace filter.
	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
		conveyor control board at terminals
		P1 and P2. Place the meter leads on
		black lead (P2) and the white lead (P1).
		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 through the one turn of the pot.
		Check both leads to ground. There
		should be no continuity to ground.
		If any of the above fail, replace
		the potentiometer.
	D.C. motor	Check for supply voltage input to
	control board	the control board at terminals L1 and L2
	If not present, check wiring back to
		the filter. If supply voltage is present,
		check both fuses on the control board
		( 8 Amp. line and 1Amp. armature).
		Check the D.C. voltage output at
		terminals A+ and A-. If A.C. voltage
		is at terminals L1 and L2, and no
		D.C. voltage is present at A+ and A-,
		replace control board. If A.C. voltage is
	present and D.C. voltage is present but
		the motor will not run, check gear motor
		as follows:
	Conveyor	If D.C. voltage is present at A+ and A-
Low Profile – 1600 Advantage Series Service Manual – International			9