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Service Manual for OF5800
Chapter 2 Machine Operations
The Thermistor (TH1 detects the surface temperature of the Upper Fusing Roller and inputs that analog
voltage into IC1-77. Corresponding to this data, the Heater Lamp ON/OFF signal is output from IC1-54,
causing the Heater Lamp (H1) to turn ON or OFF to control the fusing temperature.
If the Heater Lamp is still on after the Thermistor detects a high temperature malfunction (the surface
temperature of the Upper Fusing Roller exceeds 200 °C), the signal from IC1-75 changes from H to L to
turn OFF the Heater Lamp.
1. Warm Up - After the initialization of the printer, warm up of the printer starts and the Heater Lamp turns
ON until the temperature of the Upper Fusing Roller reaches approx. 172 °C.
2. Standby - In standby mode, the temperature of the Upper Fusing Roller is maintained at 156 °C. After 3
minutes, the printer turns to power save mode. The fuser is kept at low temperature.
3. Print Cycle - When the printer obtains the printing command from its controller, the Upper Fusing Roller
is maintained at 172 °C.
4. Standby at Low - The Upper Fusing Roller is maintained at temperature 112 °C.
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