Lexmark MS521 Service Manual

Left cover removal ..................................................................................................................................................... 177
Main drive gearbox removal....................................................................................................................................178
MPF gearbox removal ...............................................................................................................................................179
Fuser actuator removal.............................................................................................................................................182
Reverse solenoid removal .......................................................................................................................................183
Cartridge gearbox removal......................................................................................................................................184
MPF solenoid removal ..............................................................................................................................................185
Right side removals.........................................................................................................................................186
Right cover removal...................................................................................................................................................186
Interconnect cable removal.....................................................................................................................................188
Sensor (tray present) removal.................................................................................................................................189
Cooling fan removal...................................................................................................................................................190
Controller board removal.........................................................................................................................................194
Toner cartridge smart chip contact removal .......................................................................................................195
Cartridge barrel shutter sensor kit removal ........................................................................................................198
Front removals..................................................................................................................................................201
Nameplate removal....................................................................................................................................................201
MPF with front access cover removal...................................................................................................................201
Control panel assembly removal (MS621dn)..................................................................................................... 202
Control panel assembly removal (MS622de and MS622dte) .......................................................................203
Control panel (2.4‑inch display) cover, buttons, and board removal...........................................................204
Control panel (4.3‑inch display) cover, buttons, and board removal ......................................................... 205
Transfer roller removal ............................................................................................................................................ 206
Jam access cover removal .................................................................................................................................... 206
Sensor (front door) removal....................................................................................................................................207
MPF pick roller and separator pad removal...................................................................................................... 209
Sensor (MPF paper present) removal ...................................................................................................................212
Front input guide removal........................................................................................................................................213
Front USB port removal............................................................................................................................................213
Bottom removals..............................................................................................................................................216
Power supply removal...............................................................................................................................................216
Duplex assembly removal........................................................................................................................................218
Sensors (duplex and input) removal.................................................................................................................... 220
Sensor (index) removal ............................................................................................................................................222
Sensor (toner density) removal..............................................................................................................................222
Sensor (paper present) removal............................................................................................................................224
Sensor (trailing edge) removal...............................................................................................................................226
Paper present sensor flag removal.......................................................................................................................228
Pick roller assembly removal..................................................................................................................................230
Pick/lift motor gearbox removal.............................................................................................................................232
Rear side removals.........................................................................................................................................234
Rear door and cover removal.................................................................................................................................234
Fuser removal.............................................................................................................................................................234
Sensor (bin full) removal..........................................................................................................................................235
4600-830, -835, -895
Table of contents
6

Lexmark MS521 Specifications

General

Print Technology	Monochrome Laser
Print Speed	Up to 46 ppm
Print Resolution	1200 x 1200 dpi
Monthly Duty Cycle	Up to 120, 000 pages
Processor Speed	1 GHz
Standard Output Capacity	250 sheets
Operating System Compatibility	Windows, Mac OS, Linux
Hard Drive	Optional
Recommended Monthly Page Volume	2000 - 15000 pages
Duplex Printing	Standard
Connectivity	USB, Ethernet
Media Types Supported	Paper Labels, Card Stock, Envelopes, Plain Paper, Transparencies