R-22AMM (serv.man5). Function Of Important Components - Sharp Home Appliance Service Manual (repair manual). Page 2

R22AMM

5 – 2

The thermistor is a negative temperature coefficient type. The temper-
ature in the exhaust duct is detected through the resistance of the ther-
mistor. 

If the temperature is high, the control panel will display “EE7” and the
oven will stop to avoid overheating and catching fire. 

If the thermistor is open, the control panel will display “EE6” and the
oven will stop.

The thermistor is a negative temperature coefficient type. The air tem-
perature around the magnetron is detected through the resistance of
the thermistor.

If the temperature is high, the control panel will display “EE17” and the
oven will stop to protect the lower magnetron against overheat.

If the magnetron thermistor is open, the control panel will display
“EE16” and the oven will stop.

If the magnetron thermistor is short, the control panel will display
“EE19” and the oven will stop.

The blower motor (BM) drives a blade which draws external cool air
into the oven. This cool air is directed through the air vanes surround-
ing the magnetrons and cools the magnetrons. This air is channelled
through the oven cavity to remove steam and vapours given off from
the heating foods. It is then exhausted through the exhausting air
vents at the oven cavity.

The upper and lower antenna motors (SM) drive stirrer antennas.

The oven cavity light illuminates the interior of the oven so that food
being cooked can be examined visually through the door window with-
out having to open the door. The oven lamp is on during the cooking
cycle and idle condition.