HP Color LaserJet CM1015/CM1017 Service Manual - Page 57

Figure 4-1 Engine control system Power-on sequence The power-on sequence is for the purpose of the printer initialization and checking for possible malfunctions. The following is the sequence from when the printer is turned on until it enters STBY mode. 1. Power on 2. Central processing unit (CPU) initialization on the DC controller 3. ASIC initialization on the formatter 4. Video interface communication start, scanner initialization and calibration 5. Residual paper check by each sensor signaling paper presence 6. Initial drive for main motor, pickup motor, and fuser/delivery motor 7. Fuser heater initial drive by controlling fuser temperature targeting for 100°C 8. Initial drive for laser scanner motor 9. Failure/Abnormality check ● Detect scanner failure ● Fuser failure ● Door open during the above periods 10. Communication with memory tag 11. Cartridge presence detection Motors and fans The DC controller PCA controls four motors. ENWW Engine control system 47