HP COLOR LASERJET PRO MFP M176 - Page 7

Table of contents
1 Theory of operation ....................................................................................................................................... 1
Basic operation ...................................................................................................................................................... 2
Major product systems ........................................................................................................................ 2
Sequence of operation ........................................................................................................................ 3
Formatter-control system ..................................................................................................................................... 4
Sleep mode .......................................................................................................................................... 4
Input/output ........................................................................................................................................ 4
CPU ....................................................................................................................................................... 4
Memory ................................................................................................................................................ 4
NAND Flash memory ........................................................................................................................... 4
Firmware .............................................................................................................................................. 5
Memory use ......................................................................................................................................... 5
PJL overview ........................................................................................................................................ 5
LEDM overview .................................................................................................................................... 5
Control panel ....................................................................................................................................... 5
Engine-control system .......................................................................................................................................... 6
DC controller ........................................................................................................................................ 7
Low-voltage power supply ................................................................................................................. 8
High-voltage power supply ................................................................................................................. 9
Fuser control ..................................................................................................................................... 10
Image-formation system .................................................................................................................................... 11
Image-formation process ................................................................................................................. 12
Latent-image formation stage ....................................................................................... 14
Step 1: Primary charging .............................................................................. 14
Step 2: Laser-beam exposure ...................................................................... 14
Developing stage ............................................................................................................ 15
Step 3: Development .................................................................................... 15
Transfer stage ................................................................................................................. 16
Step 4: Primary transfer ............................................................................... 16
Step 5: Secondary transfer .......................................................................... 16
Step 6: Separation from the drum ............................................................... 17
Fusing stage .................................................................................................................... 17
ENWW v