Lincoln II - Advantage Series service manual

Temp. display inoperative	Display Transformer	Measure the transformer primary for a nominal 120
		VAC input, if voltage is not present, trace wiring back
		to the oven power source. Measure the secondary
		output, which will normally be 12-15 VAC. Voltage
		across terminals 1 and 3 on the time/temp. display
		should read 12-15 VAC. Terminals 1-2 and 2-3
		should be 1/2 the voltage reading to 1-3. If the
		above secondary readings are not achieved, replace
		transformer.
	Temp. 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.
Temp. Display inaccurate,	Thermocouple	Place the thermocouple of a pyrometer into the
erratic or inoperative		center of the top finger. Be sure the tip of the
		thermocouple is not touching metal, it must sense air
		temperature only. The pyrometer will indicate oven
		temperature. Measure DC millivolts of thermocouple
		at the temperature display. See thermocouple chart
		on page 19 for proper readings. Replace
		thermocouple if proper readings are not achieved. If
		readings are correct on the thermocouple, replace
		temperature display.

12 Impinger II – Advantage Service Manual - Domestic