Lincoln II - Advantage Series With Power on and Thermocouple, Leads Attached to the Temperature

	Temperature Control	Check for supply voltage at temperature control. If
		no voltage is present, trace wiring back to hi-limit
		thermostat. Turn the temperature adjustment knob
		to maximum temperature position and check for
		208/240 VAC at the load terminals 7 and 8. If
		208/240 VAC is present and unit is not heating,
		refer to "Mercury Contactor" for next check. If
		208/240 VAC is not present, proceed.
	Thermocouple Probe	WITH POWER ON AND THERMOCOUPLE
		LEADS ATTACHED TO THE TEMPERATURE
		CONTROL BOARD: measure D.C. millivolt output
		of these leads. Refer to thermocouple chart in
		Section D for proper readings. If these readings
		are not achieved, replace thermocouple.
	Temperature Control	Disconnect the potentiometer leads from the board.
	Potentiometer	Place ohm meter test leads on the blue and green
		pot. leads. Reading should be 1 K ohms.
		Place meter leads across the blue and purple pot.
		leads and rotate knob from high to low. Repeat on
		green and purple leads. Check for even rise and
		fall of ohms reading to insure that there are no open
		or dead spots in the potentiometer. Check each
		lead to ground for shorts. Replace pot if it does not
		meet the above test.
	Mercury Contactor	Check for supply voltage to the contactor coil. If
		voltage is present and the contactor will not
		activate, replace the contactor. Also, check each
		contactor for proper high voltage input and output.
	Heater Elements	Check the amp draw on each hot leg for proper
		load. Check the specifications plate for rating
		information. If the amp draw is low or high, check
		the individual elements for opens, shorts, and
		proper resistance. WITH POWER OFF: To check
		resistance of the elements, remove all leads from
		the elements and use an accurate digital VOM.
		The element resistance should be as follows:
		208V - 27 ohms	approximately
		240V - 36 ohms	approximately
Oven heats with switch off	Mercury Contactor	The mercury contactor has probably malfunctioned
		in the closed position. If there is no voltage to the
		operating coil, but there is high voltage at the
		contactor out put, replace the mercury contactor.
Intermittent Heating	Thermal/Overload of motor	The main fan motor is equipped with internal
		thermal protection and will cease to operate if
		overheating occurs. As the motor overheats and
		then cools, this will cause the oven to cycle on and
		off intermittently. This may be caused by improper
		ventilation or preventive maintenance. Also, most
		of the problems listed under "Oven will not heat"
		can cause intermittent failure.
Conveyor will not run	Voltage Supply	Check incoming voltage supply at line 1 to neutral.
		There should be a voltage reading of 208/240 VAC.
		If not present, check breakers.
	10 Amp Fuse	Check and/or replace.
	Fuseholder	Check and/or replace.
	Fan Switch	See procedure for checking on page 8.

14 Impinger II – Advantage Service Manual - Domestic