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Impinger II – Advantage Service Manual - Domestic
12
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,
erratic or inoperative
Thermocouple Place the thermocouple of a pyrometer into the
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.