2 ] Ink-Related Problems - Brother MFC5890CN Service Manual

[ 2 ] Ink-related problems

Problems of this nature may arise not only due to machine malfunction but also to the user's
actions.
IMPORTANT: In many cases, the user fails to set ink cartridges in place.
Problems due to the user's actions
Check
Ink cartridges
Problems due to machine malfunction
Check
Head/carriage unit
Maintenance unit
FB unit
Possible causes
- Ink cartridges are not inserted fully
into the ink refill ASSY.
- One or more of the ink cartridges are
not loaded.
- One or more of the ink cartridges has
run out of ink.
Possible causes
- Air bubbles, high viscosity ink, or
foreign materials have found their
way into the head/carriage unit.
- Head flat cables are broken.
- The carriage-head flat cable has not
been inserted into the carriage PCB.
- Air bubbles, high viscosity ink, or
foreign materials get into the
maintenance unit.
- Torque not transmitted.
- Drain tube bent or pinched.
The CIS unit is weak in identifying
colors.
4-43
Problems that may result
The machine will not be able to
print.
Problems that may result
Dot missing occurs on the
printout.
The machine will not be able to
print or drive the head/carriage
unit.
Head cleaning operation will not
be possible and/or the
maintenance unit will not work.
The quality of print colors in
copying operation will be low.
Confidential