HP 2420 Service Manual - Page 7

Removal and replacement, Troubleshooting, Step 1: Primary charging - fuser replacement

Page 7 highlights

ENWW Internal components...63 Timing...64 Engine control system...66 Laser/scanner system...68 Pickup/feed/delivery system...69 Image-formation system...71 Step 1: Primary charging 72 Step 2: Laser beam exposure 72 Step 3: Developing...73 Step 4: Transfer...73 Step 5: Separation...74 Step 6: Fusing...74 Step 7: Drum cleaning...75 Print cartridge memory system 76 6 Removal and replacement Chapter contents...77 Introduction ...78 Removal and replacement strategy 78 Electrostatic discharge ...78 User-replaceable parts ...78 Required tools ...78 Before performing service ...79 Pre-service procedures ...79 Parts removal order ...80 Covers...81 Right-side cover...81 Back cover...82 I/O cover...85 Left-side cover...86 Top, right cover...88 Top cover...89 Front, right cover...90 Control panel...92 Formatter...94 Fuser...98 Laser/scanner...103 Right-side handle...106 ECU...108 Access plate...114 Power supply...115 Gear assembly...120 Tray 1 solenoid...124 Tray 2 solenoid...125 E-label reader (memory tag 126 Face-down-roller shaft...128 Cartridge door...130 Transfer roller...133 Registration assembly...134 Tray 1 pickup roller...137 Tray 2 pickup roller...138 Separation pad...140 7 Troubleshooting Chapter contents...141 v

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Internal components
.................................................................................................................
63
Timing
.......................................................................................................................................
64
Engine control system
..............................................................................................................
66
Laser/scanner system
..............................................................................................................
68
Pickup/feed/delivery system
....................................................................................................
69
Image-formation system
...........................................................................................................
71
Step 1: Primary charging
...................................................................................................
72
Step 2: Laser beam exposure
...........................................................................................
72
Step 3: Developing
............................................................................................................
73
Step 4: Transfer
.................................................................................................................
73
Step 5: Separation
.............................................................................................................
74
Step 6: Fusing
....................................................................................................................
74
Step 7: Drum cleaning
.......................................................................................................
75
Print cartridge memory system
................................................................................................
76
6 Removal and replacement
Chapter contents
......................................................................................................................
77
Introduction
..............................................................................................................................
78
Removal and replacement strategy
..................................................................................
78
Electrostatic discharge
.....................................................................................................
78
User-replaceable parts
.....................................................................................................
78
Required tools
...................................................................................................................
78
Before performing service
.......................................................................................................
79
Pre-service procedures
....................................................................................................
79
Parts removal order
..........................................................................................................
80
Covers
......................................................................................................................................
81
Right-side cover
.................................................................................................................
81
Back cover
.........................................................................................................................
82
I/O cover
............................................................................................................................
85
Left-side cover
...................................................................................................................
86
Top, right cover
..................................................................................................................
88
Top cover
...........................................................................................................................
89
Front, right cover
................................................................................................................
90
Control panel
............................................................................................................................
92
Formatter
..................................................................................................................................
94
Fuser
........................................................................................................................................
98
Laser/scanner
........................................................................................................................
103
Right-side handle
...................................................................................................................
106
ECU
........................................................................................................................................
108
Access plate
...........................................................................................................................
114
Power supply
..........................................................................................................................
115
Gear assembly
.......................................................................................................................
120
Tray 1 solenoid
.......................................................................................................................
124
Tray 2 solenoid
.......................................................................................................................
125
E-label reader (memory tag)
..................................................................................................
126
Face-down-roller shaft
...........................................................................................................
128
Cartridge door
........................................................................................................................
130
Transfer roller
.........................................................................................................................
133
Registration assembly
............................................................................................................
134
Tray 1 pickup roller
.................................................................................................................
137
Tray 2 pickup roller
.................................................................................................................
138
Separation pad
.......................................................................................................................
140
7 Troubleshooting
Chapter contents
....................................................................................................................
141
ENWW
v