Left front cover .................................................................................................. 28
Top cover .......................................................................................................... 29
Front cover ........................................................................................................ 34
Right cover ........................................................................................................ 35
Main assemblies ................................................................................................................ 36
Aerosol fan assembly ........................................................................................ 36
Separator/pick assembly ................................................................................... 43
Duplex drive module ......................................................................................... 48
Control panel (X451 models only) ..................................................................... 50
Control panel (X551 models only) ..................................................................... 51
Power supply ..................................................................................................... 53
Backscatter drop detect (BDD) assembly ......................................................... 55
Service sled assembly ...................................................................................... 57
Right cross brace .............................................................................................. 63
Plate console left ............................................................................................... 66
Plate console right ............................................................................................. 67
Printbar .............................................................................................................. 68
Printbar calibration procedure ........................................................................... 76
Printbar FFC replacement ................................................................................. 78
Platen ................................................................................................................ 79
Drying path gear assembly ............................................................................... 83
Printbar lift mechanism assembly ..................................................................... 84
Tray lift transmission assembly ......................................................................... 86
Output drive kit .................................................................................................. 88
Output drive gears ............................................................................................. 91
Output drive shaft 6 ........................................................................................... 91
Output drive shaft 5 ........................................................................................... 93
Output drive shaft 4 ........................................................................................... 95
Drive shaft 3 ...................................................................................................... 96
Inner top frame .................................................................................................. 99
Top paper guide .............................................................................................. 102
Top left paper guide assembly ........................................................................ 105
Center left paper guide assembly ................................................................... 107
Paper REDI sensors in the center left paper guide assembly ......................... 109
Service sled transmission ............................................................................... 110
Printed circuit-board assemblies (PCAs) ......................................................................... 111
PCA safety shield ............................................................................................ 111
Sensor carriage PCA and encoder strip .......................................................... 112
Power button PCA ........................................................................................... 116
Duplex module sensor PCA ............................................................................ 117
Temperature sensor ........................................................................................ 118
vi ENWW