Service manual

4 • Troubleshooting/Diagnostics
DM300c/DM400c/DM475 Service Manual (SV61801 Rev. D)
4-9
4.2 Troubleshooting Tables
Errors Checkpoints Possible Cause/Solution
Poor print from
used ink car-
tridge.
Follow steps at right. Remove the printhead and check for bent pins.
Pins are normally angled downward.
Make sure printhead is correctly installed.
Check printhead harness and connection at J127.
If purges fail to correct the problem, and the ink
cartridge is not empty, replace the printhead.
If this fails to correct the problem, there may be
a problem with the print head carriage board.
This requires replacement of the print head
carriage assembly.
Print is not clean
and crisp; smear-
ing or spotting
evident. Ink sup-
ply is okay.
Check to see that the edges of the wiper blade
on the front of the maintenance station are clean.
Also check the “wiper wiper” clipped on the rear
of the print carriage. It can be easily unclipped
and removed for inspect and replacement.
Check the wiper blade for excess ink accumu-
lation. Clean as required. Replace wiper wiper
if necessary. Wiper blade cannot be replaced.
Does a purge correct the problem? If needed, purge and run a test print.
Is the carriage moving normally so that wiping
occurs?
Check carriage movement and correct any
problems. See table 4-7.
Is the printhead harness properly connected at
J127?
Make sure it is locked in position.
No print, red or
partial print.
Possible print head controller (PHC) failure.
Check for bent pins. These are behind print
head (see figure) and are angled downward.
Figure 4-4 Contact Pins
Check for bent pins
Partial, streaked
or Incomplete
print.
Check the edges of the opening in the registra-
tion plate for ink and paper dust deposits.
Clean as required.
Wiper and/or capping station may be contami-
nated with excess ink. Purge may be required.
Clean wiper and capping station. Perform a “C”
purge, then a “D” purge.
Table 4-6 Printing Faults (cont’d)