Lexmark T420 User Reference page 157

sheet, printing 125
printer system board
accessing 137
reinstalling the shield 140
printhead lens, cleaning 74
printing
duplex
from multipurpose feeder 57
from trays 57
font samples 13
on two sides
from multipurpose feeder 57
from trays 57
Printing a directory 102
Printing a font list 102
Printing menu settings page(s)
102
Printing Print Quality Test Pages
102
printing problems
solving
job not printing and Error light
on solid 78
Load/Remove Paper light on,
optional tray is loaded 78
missing or damaged parts
77
multiple sheets feed 78
operator panel lights do not
come on 77
optional 250-sheet tray,
paper feed failure 78
optional 500-sheet tray,
paper feed failure 78
optional label tray, paper
feed failure 78
Paper Jam light on, jam is
cleared 79
print media buckles 78
print media skews 78
print media sticks 78
printer flushing data and
Ready and Error lights
blinking 79
printer on, Error light on 78
printer on, nothing prints 77
standard tray, paper feed
failure 78
Toner Low light on and
printing stops 78
upper front door will not close
77
problem solving
network printing problems
incorrect characters 86
job not printing 86
option problems
does not operate after
installation 85
quits working 85
other problems
obtaining updated drivers
and utilities 87
printer escape codes 87
print quality problems
background shading 84
blank pages 83
blurred characters 80
faint images 82
incorrect left and top margins
83
jagged characters 83
light characters 80
light printing, but Toner Low
light is not on 82
missing characters 84
partial page, black 84
poor image quality 83
print too dark 83
repetitive spots 82
solid black on transparencies
82
toner fog 84
Toner Low light on 82
toner rubs off page 81
toner smears on page 81
toner smudges 80
uneven edges 83
unexpected characters print
84
vertical or horizontal streaks
81
white streaks on paper 82
printing problems
incorrect characters 76
incorrect print media type 77
job not printing 76
job not printing and Error light
on solid 78
Load/Remove Paper light on,
optional tray is loaded 78
misfeeds 77
missing or damaged parts
77
multiple feeds 77
multiple sheets feed 78
operator panel lights do not
come on 77
optional 250-sheet tray,
paper feed failure 78
optional 500-sheet tray,
paper feed failure 78
optional label tray, paper
feed failure 78
Paper Jam light on, jam is
cleared 79
print media buckles 78
print media skews 78
157
print media stacking is messy
77
print media sticks 78
printer flushing data and
Ready and Error lights
blinking 79
printer on, Error light on 78
printer on, nothing prints 77
standard tray, paper feed
failure 78
Toner Low light on and
printing stops 78
upper front door will not close
77
USB port 77
wrong source 77
Programming flash 102
Programming network code 103
Protocol (Parallel menu) 128
R
Ready 110
Ready with Toner Low 111, 112
rear output bin
card stock, exiting to 60
using 60
reinstalling shield on system board
140
removing
metal shield 138
optional drawer 136
optional flash memory 140
optional memory cards 140
optional printer memory 140
printer from an optional drawer
136
Reset Factory Defaults (Utility
menu) 126
Resetting printer 114
Resolution reduced 114
Restoring factory defaults 115
restoring factory defaults 131
S
safety information 146
Secondary error code 106
secondary error codes
complex page 116
font error 117
insufficient defrag memory 118
memory full 116
short paper 117
sending a job to print 10
from Macintosh 10
from Windows 10
Service error 110
Set Card Speed (Network menu)