HP Color LaserJet CM2320 Service Manual - Page 101
Fuser control circuit
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Fuser control circuit The fuser control circuit maintains the temperature of the fuser heater at its targeted temperature. Figure 5-7 Fuser control circuit Fuser unit Zero crossing circuit ZEROX DC controller Fuser sleeve FU2901 RL2901 Relay drive circuit /RLD+ RLD- TH803 TH802 TH801 RL1 Pressure roller Fuser heater (H120/H220) Sub power supply FU1:Thermal fuse TH801: Main thermistor TH802: Sub thermistor 1 TH803: Sub thermistor 2 Fuser heater control circuit FSRD Fuser control circuit Fuser power supply MAINTH SUBTH SUB2TH Fuser heater safety circuit The DC controller monitors the fuser temperature (MAINTH, SUBTH and SUB2TH) signals and sends the fuser heater control (FSRD) signal according to the detected temperature. The fuser heater control circuit controls the fuser heater depending on the signal so that the heater remains at the targeted temperature. ENWW Engine control system 89
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