HP M276 - Page 7

Table of contents
1 Theory of operation .......................................................................................................... 1
Basic operation ........................................................................................................................ 2
Major product systems ............................................................................................... 2
Product components .................................................................................................. 3
Sequence of operation ............................................................................................... 4
Engine control system ............................................................................................................... 5
DC controller ............................................................................................................ 6
Low-voltage power supply .......................................................................................... 7
High-voltage power supply ......................................................................................... 8
Laser/scanner system ............................................................................................................... 9
Laser failure detection ................................................................................................ 9
Image-formation system ........................................................................................................... 10
Image-formation process .......................................................................................... 10
Latent-image formation stage .................................................................................... 11
Step 1: primary charging .......................................................................... 12
Step 2: laser-beam exposure ..................................................................... 12
Developing stage .................................................................................................... 12
Step 3: development ................................................................................. 13
Transfer stage ......................................................................................................... 14
Step 4: primary transfer ............................................................................ 14
Step 5: secondary transfer ......................................................................... 14
Step 6: separation from the ITB .................................................................. 15
Fusing stage ........................................................................................................... 15
Step 7: fusing .......................................................................................... 15
ITB cleaning stage ................................................................................................... 16
Step 8: ITB cleaning ................................................................................. 16
Drum cleaning stage ................................................................................................ 17
Step 9: drum cleaning .............................................................................. 17
Pickup-and-feed system ........................................................................................................... 18
Jam detection ......................................................................................................... 19
Scanner system (base models) ................................................................................................. 20
Scanner power-on sequence of events .......................................................................
20
ENWW v