Lexmark Optra E Service Manual - Page 76

4026-0XX Fuser Operation Fuser Mode Warm-Up Mode Standby Mode Print Cycle Printer Action When the printer power is turned on the fuser lamp turns on until the hot roll temperature reaches approximately 172 degrees centigrade. The hot roll temperature reaches approximately 156 degrees centigrade. If this temperature is maintained for three minutes, the printer switches to low temperature standby mode and the hot roll is maintained at 112 degrees centigrade. The hot roll is maintained at 172 degrees centigrade if the engine board receives a print command from the controller board. Note: The hot roll temperature is slightly higher on models 06C and 06F during the print cycle. Fuser Control The thermistor detects the hot roll temperature and sends a corresponding analog signal to the engine board. The engine board turns the lamp on or off depending on the analog signal from the thermistor. If the thermistor detects a high temperature failure but the fuser lamp does not turn off, the thermal fuse opens (thermostat on models 4026-06C and 06F) and the engine board turns the fuser lamp off. 3-9