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The product has 11 motors and three fan motors. The motors drive the components in the paper-feed
and image-formation systems. The fan motors cool the product's inside.
Table 1-6 Motors
Abbreviation Name Purpose Type Failure detection
M2 Fuser motor Drives the Fuser roller,
the delivery roller, and
the Fuser pressure
roller
DC motor Yes
M3 Drum motor 1 Drives the
photosensitive drum
(yellow/magenta),
developing unit
(yellow), and primary
charging roller
(yellow/magenta)
DC motor Yes
M4 Drum motor 2 Drives the
photosensitive drum
(cyan), developing unit
(magenta/cyan), and
primary charging roller
(cyan)
DC motor Yes
M5 Drum motor 3 Drives the
photosensitive drum
(black), developing unit
(black), and ITB drive
roller, and secondary
transfer roller
DC motor Yes
M7 Lifter motor Drives the lifter for the
cassette
Stepping motor Yes
M8 Cyan/black scanner
motor
Drives the scanner
mirror in the cyan/
black laser scanner
DC motor Yes
M9 Yellow/magenta
scanner motor
Drives the scanner
mirror in the yellow/
magenta laser scanner
DC motor Yes
M10 Developing
disengagement motor
Drives the developing
unit disengagement
Stepping motor No
M11 Duplex reverse motor
(HP LaserJet Enterprise
500 color M551dn
and HP LaserJet
Enterprise 500 color
M551xh only)
Drives the duplex
reverse roller and
duplex feed roller
Stepping motor No
8 Chapter 1 Theory of operation ENWW