HP Color LaserJet CM4730 Service Manual - Page 173
Initial rotation temperature control, Start-up temperature control,
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Figure 4-10 Heater temperature control circuit The fuser heater temperature is monitored by two thermistors: the main thermistor (TH1) and the sub thermistor (TH2). The main thermistor controls the print temperature and the between-sheets temperature. The sub thermistor detects the one-sided temperature rise of the fuser heater, and controls the initial rotation temperature and the start-up temperature. The CPU (IC1101) on the DC controller monitors the voltage of the fuser heater temperature signals. The CPU sends the fuser heater drive signal (FSRD1) according to the voltage level. The fuser heater control circuit controls the fuser temperature so the heater remains at the target temperature. The fuser temperature control is divided into the following four sequences. NOTE: During standby, the fuser temperature is maintained at about 76.7°C (170°F) to accommodate a first-print time of less than 15 seconds. Initial rotation temperature control This control melts the grease inside the fuser sleeve and lubricates the sleeve when the power is turned on to prevent sleeve damage. If the sub thermistor detects the temperature of below 50°C (122°F) at power-on, the CPU turns on the fuser heater for a prescribed time period before it drives the fuser motor. Start-up temperature control This control determines the start-up power provided to the fuser heater according to the temperature detected by the sub thermistor at heater energization. If the heater is energized within 30 seconds after the previous print completion, the heater control starts at this temperature point. ENWW Engine control system 153
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