FAULT FINDING AND REPAIR
20509 Issue 7 Jan 2018 4-3
Pump runs
intermittently with
ink container
empty
Air leak in inlet line at ink
container fitting
Check condition of ink
container QCD and feed
line
Air leak at inlet filter Check tightness of
fittings
Back leakage through
spring NRV O-Rings
Check condition of NRV.
Strip and clean where
necessary. (see page -
19)
Pump runs but
does not
pressurise
system
Excess air in bleed
reservoir
Bleed air from ink
system. (see page 3-5)
Air leak in system Check tightness of all
connections and fittings.
If fault persists replace
ink system
Faulty pump Replace pump. (see
page 4-25)
Pump runs
continuously
Back leakage through
NRVs
Strip and clean NRVs
(see page 4-19)
Ink leakage Check tightness of all
fittings
Faulty pressure switch Check pressure switch.
Replace if fault persists,
(see
page 4-21)
Air leak at accumulator Check tightness of all
fittings. If fault persists,
replace ink system.
Indication Possible Cause Remedy