Hitachi IJ UX Service Manual page 226

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