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,

DC motor

Yes

 

 

the delivery roller, and

 

 

 

 

the Fuser pressure

 

 

 

 

roller

 

 

 

 

 

 

 

M3

Drum motor 1

Drives the

DC motor

Yes

 

 

photosensitive drum

 

 

 

 

(yellow/magenta),

 

 

 

 

developing unit

 

 

 

 

(yellow), and primary

 

 

 

 

charging roller

 

 

 

 

(yellow/magenta)

 

 

 

 

 

 

 

M4

Drum motor 2

Drives the

DC motor

Yes

 

 

photosensitive drum

 

 

 

 

(cyan), developing unit

 

 

 

 

(magenta/cyan), and

 

 

 

 

primary charging roller

 

 

 

 

(cyan)

 

 

 

 

 

 

 

M5

Drum motor 3

Drives the

DC motor

Yes

 

 

photosensitive drum

 

 

 

 

(black), developing unit

 

 

 

 

(black), and ITB drive

 

 

 

 

roller, and secondary

 

 

 

 

transfer roller

 

 

 

 

 

 

 

M7

Lifter motor

Drives the lifter for the

Stepping motor

Yes

 

 

cassette

 

 

 

 

 

 

 

M8

Cyan/black scanner

Drives the scanner

DC motor

Yes

 

motor

mirror in the cyan/

 

 

 

 

black laser scanner

 

 

 

 

 

 

 

M9

Yellow/magenta

Drives the scanner

DC motor

Yes

 

scanner motor

mirror in the yellow/

 

 

 

 

magenta laser scanner

 

 

 

 

 

 

 

M10

Developing

Drives the developing

Stepping motor

No

 

disengagement motor

unit disengagement

 

 

 

 

 

 

 

M11

Duplex reverse motor

Drives the duplex

Stepping motor

No

 

(HP LaserJet Enterprise

reverse roller and

 

 

 

500 color M551dn

duplex feed roller

 

 

 

and HP LaserJet

 

 

 

Enterprise 500 color

M551xh only)

8

Chapter 1 Theory of operation

ENWW