HP LASERJET ENTERPRISE CP4020 - Detailed Component Removal; Service Preparation and Testing; Removing Key Components; External Panel Removal

Before performing service .................................................................................................................. 70
After performing service ..................................................................................................................... 70
Post-service test ................................................................................................................................. 71
Print-quality test ................................................................................................................. 71
Parts removal order ............................................................................................................................ 72
Customer self repair (CSR) components ........................................................................................... 74
Print cartridges ................................................................................................................... 74
Toner-collection unit .......................................................................................................... 76
Formatter PCA ................................................................................................................... 78
Hard drive .......................................................................................................................... 79
Remove the hard drive ...................................................................................... 79
Memory DIMM ................................................................................................................... 81
Remove the memory DIMM .............................................................................. 81
Enable memory ................................................................................ 82
Tray .................................................................................................................................... 84
Fuser ................................................................................................................................. 85
Feed and separation rollers (Trays 2-5) ............................................................................ 86
Pickup roller (Tray 1) ......................................................................................................... 87
Secondary transfer roller ................................................................................................... 90
Reinstall the transfer roller ................................................................................ 91
Intermediate transfer belt (ITB) .......................................................................................... 92
External panels, covers, and doors .................................................................................................... 95
Identification and location .................................................................................................. 95
Upper-left cover ................................................................................................................. 96
Power-supply cover ........................................................................................................... 98
Left cover ........................................................................................................................... 99
Remove the left cover ....................................................................................... 99
Front-top cover ................................................................................................................ 100
Remove the front-top cover ............................................................................. 100
Rear-top cover ................................................................................................................. 102
Remove the rear-top cover ............................................................................. 102
Right-front cover .............................................................................................................. 103
Remove the right-front cover ........................................................................... 103
Reinstall the power button .............................................................. 104
Control-panel assembly ................................................................................................... 105
Remove the control-panel assembly ............................................................... 105
Front-door assembly ........................................................................................................ 107
Remove the front-door assembly .................................................................... 107
Right-rear cover ............................................................................................................... 110
Remove the right-rear cover ........................................................................... 110
Rear cover ....................................................................................................................... 112
Remove the rear cover ................................................................................... 112
Right-door assembly ........................................................................................................ 113
Internal assemblies .......................................................................................................................... 118
ENWW vii