T
theory of operation
ACM 458
duplex printing 457
electrophotographic process 462
input tray 455
main drive gearbox 458
MPF 456
other key components 460
POR sequence 455
printer control 455
sensors 459
simplex printing 456
tips
card stock 30
envelopes 30
labels, paper 31
letterhead 31
transparencies 32
Too many flash options installed [58] 110
Too many trays attached [58] 110
tools, required 35
touch screen
buttons 178
transparencies
tips 32
troubleshooting
initial check 37
scan/fax/copy symptoms 153
troubleshooting, print quality
840.xx service check 151
ADF cover open service check 80
ADF duplex service check 159
ADF feed errors service check 158
ADF paper jam service check 78
ADF streak service check 157
black or blank page copy service check 154
blank pages 41
CCD service check 155
fax reception service check 161
fax transmission service check 163
flatbed home position service check 156
flatbed motor service check 155
gray background on prints 40
modem/fax card service check 160
repeating defects 41
shadow images appear on prints 42
skewed print 43
solid black pages 42
streaked vertical lines appear on prints 45
toner rubs off 46
toner specks appear on prints 47
troubleshooting, service checks
8yy service error messages 150
network service check 147
U
unacceptable paper 28
understanding the home screen buttons and icons 176
Unformatted flash detected [53] 110
Unsupported option in slot [x] [55] 111
Unsupported USB hub, please remove 100
USB port 398
USB port [x] disabled [56] 111
using the touch‑screen buttons 178
V
vertical mount contact connector 229
W
Weblink server not set up. Contact system
administrator. 111
Z
zero insertion force (ZIF) connectors 222
7016
Index
479