HP LaserJet Enterprise P3015 Service Manual - Page 5

Table of contents 1 Theory of operation Basic operation ...2 Major printer systems ...2 Printer block diagram ...2 Sequence of operation ...3 Normal sequence of operation 3 Formatter-control system ...4 Sleep mode ...4 Input/output ...4 CPU ...4 Memory ...5 Optional hard disk 5 Firmware ...5 Nonvolatile memory 5 PJL overview ...5 PML ...5 Control panel ...5 Engine-control system ...6 Motors, fans, clutches, solenoids, switches, and sensors 7 DC controller operations ...14 Fuser-control circuit ...16 Fuser failure detection 17 Fuser temperature control 18 Fuser protective function 19 Low-voltage power supply 20 Overcurrent/overvoltage protection 21 High-voltage power supply 22 Formatter ...23 Formatter heartbeat LED 23 DIMM slots ...23 Laser/scanner system ...24 Laser failure detection 25 Image-formation system ...26 Electrophotographic process 26 ENWW v