Xerox Phaser 840 Service Manual page 275

IX. Printer shuts down on its own
ADDITIONAL CLUES
1.
Printer shuts down
with power switch
still "on." Cycling
power brings
printer back to
"Ready."
X 2-inch wide black stripe on every print
ADDITIONAL CLUES
1.
Black stripe is
composed of all 4
colors and extends
from very top edge
of page to very
bottom edge of
page.
XI Squiggly vertical lines across entire print image
ADDITIONAL CLUES
1.
X-axis motor not
moving (840 only).
Loss of power
PROBABLE ROOT CAUSE
A. Spurious over-current.
PROBABLE ROOT CAUSE
A. Damaged printhead data
cable.
B. Failed main board.
PROBABLE ROOT CAUSE
A. Blown x-axis fuse on
power control board (840
only).
ACTIONS (follow in order)
1A. If printer powers back on within
two seconds, do nothing.
If printer powers on in about 6
seconds, remove power cord,
wait 30 seconds, and then plug
back in. If it then powers up within
2 seconds, do nothing.
Otherwise, replace power supply.
If the printer does not power back
on after waiting at least 10
seconds, replace main board.
ACTIONS (follow in order)
1A.Reseat the printhead data
cable, Replace the printhead
data cable.
1B.Reseat the main board,
Replace the main board.
ACTIONS (follow in order)
1A.Replace the
power control board (840 only).
Appendix 259