Hitachi IJ UX Service Manual page 244

6.2.27 Circulation Route Pressure Is High
<Conditions an alarm is issued>
An alarm "Circulation Route Pressure Is High" is displayed on the screen when the
ink is being ejected and the ink pressure is not lowered at MV5 "ON/Open" step in the
following sequences 1), 2) and 3).
(When Ink pressure is still kept at 0.05Mpa or higher.)
1) Eject Ink （Goes to Ready）
2) Eject Ink （Goes to Standby）
3) Ink circulation
Refer to "7.3 Circulation sequence" for sequences.
Circulation Route
Pressure Is High
Does the MV5 operate?
Press "Nozzle backwash" button and then
"Start/Continue" button on Circulation Control
screen and sprinkle makeup over the tip of the
nozzle.
Is makeup suctioned?
Press "Operation test" button of "Viscometer calibration"
screen and confirm by the naked eye that ink flows to
the viscometer from the Main ink tank.
Does ink flow to the
viscometer from the Main
ink tank?
Replace the circulation pump.
No
Replace MV5 or clean any ink buildup or
other foreign matters.
Yes
Yes
Yes
No
Yes
No
6-26
Does the fault recur?
No
Does the fault recur?
No
Resume the
operation.
Yes
Replace the print head.