FAULT FINDING AND REPAIR
4-2 20509 Issue 7 Jan 2018
INTRODUCTION
WARNING: Protective clothing, especially eye protection,
should be worn at all times when working on the
ink circuit.
This part of the manual provides help in identifying the causes of problems
and gives repair procedures. Certain repairs should only be carried out by
trained personnel, and it is recommended that the printer or sub-assembly
is returned to Domino or a distributor.
FAULTS RELATED TO THE INK SYSTEM
Indication Possible Cause Remedy
Ink pressure
reduced
(* See Note)
Back leakage through
NRVs
Check NRVs and clean
as necessary. (see page
4-19)
Pressure switch leak Check connections and
replace if necessary. (see
page 4-21)
Air leak at manifold Tighten all external
elbow fittings and check
piping. If fault persists
replace ink system
Air leak at accumulator
valve, elbow fitting,
flange or valve boss
weld
Check tightness of
fittings. If fault persists
replace ink system
Pressure drops
when bleed valve
opened
Back leakage through
accumulator NRV
Check tightness of
fitting. Strip and clean
where necessary. (see
page 4-21)
Pump runs
intermittently
during normal
pressurisation
Restriction in inlet pipe
from ink container
Check condition of inlet
pipe from ink container
Ink filter blocked Replace ink filter. (see
page 3-6)
* Note: Ambient temperature drop will cause an apparent loss in
pressure. This is normal.
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