Hitachi IJ UX, Service Manual

Page: 226 / 308

6-8
6.2.5 Ink Drop Charge Too Low
Pour a cleaning solution over
the orifice plate surface to
clean it, then allow it to
thoroughly dry.
If the problem is
not fixed:
If the problem is
not fixed:
Ink Drop Charge
Too Low
▪ Press the Reset key to
clear the fault.
▪ Eject the ink to restart the
IJ printer.
1
Are the charge electrode
and nozzle end connected
via ink?
Pour the makeup over the
charge electrode and nozzle
area to clean them and allow
them to thoroughly dry.
Is the cumulative ink
use time longer than
the useful ink life?
Replace the ink.
Yes
Yes
Yes
No
No
Is the ink drop shape good?
Change the excitation
voltage setting to assure
proper ink drop shape.
No
Yes
Is the nozzle clogged
or the ink stream bent?
1
No
Replace the EZJ126 board.
Remove the orifice plate from
the nozzle, subject it to
ultrasonic cleaning, reinstall
it, and adjust the stream.
Execute the “Nozzle
Backwash” function from the
circulation control screen.
If the problem is
not fixed:
Replace the print head.
Is the gutter section
soiled ?
Clean the gutter and its
surrounding area with a
cleaning solution. *1
Yes
No
If the problem is
not fixed:
Replace the EZJ125 board.
APH Shield
Gutter
Remove any dirt on this surface: If this surface is dirty, and the gutter
hole and APH shield are connected via ink, the APH signal output may
be unstable. Take special care when using carbon ink.
* 1