T
theory
duplex paper path 446
main drive 449
paper path sensors 448
simplex paper path 446
tray drive 450
theory of operation
POR sequence 437
printer control 437
theory, ADF paper path 452
theory, ADF paper path sensors 453
theory, flatbed scanner 451
toner rubs o 68
toner specks appear on prints 69
tools, required 26
transfer 443
tray
drive 450
troubleshooting
base printer symptoms 174
fax symptoms 164
initial check 29
troubleshooting, print quality
blank pages 34
clipped pages or images 64
compressed images appear on prints 66
fax reception service check 168
fax transmission service check 166
fine lines are not printed correctly 63
folded or wrinkled paper 46
gray background on prints 32
horizontal light bands 54
incorrect margins on prints 67
paper curl 45
print is too dark 40
print is too light 42
repeating defects 50
skewed print 51
solid black pages 47
streaked vertical lines appear on prints 53
toner rubs o 68
toner specks appear on prints 69
vertical dark bands 56
vertical dark streaks with print missing 58
vertical light bands 55
white streaks and voided areas 60
troubleshooting, service checks
950–953 service error messages 160
U
understanding the status of the power button and
indicator light 180
updating the printer firmware
using a flash drive 207
using a network computer 207
using a USB cable connection 207
using the control panel 179
using the home screen 180
V
vertical dark bands 56
vertical dark streaks with print missing 58
vertical mount contact connector 217
W
white streaks and voided areas 60
Z
zero insertion force (ZIF) connectors 210
7018
Index
461