Hitachi UX Twin Nozzle Service Manual page 254

6.2.5b (N2)Ink Drop Charge Too Low
(N2)Ink Drop Charge
Too Low
1
Is the nozzle2 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
Does ink or makeup
leak from the rear cover
of printhead?
Replace the EZJ125 board *1.
If the problem is
not fixed:
Replace the EZJ133 board *2.
If the problem is
not fixed:
Replace the print head *3.
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.
Yes
Replace the ink.
No
Change the excitation
voltage setting to assure
proper ink drop shape.
Open the rear cover of
printhead and then wipe the
ink stains and dry the
printhead. And then, replace
the parts at the leaking point,
such as O-rings between the
gutter base and the headbase,
packings of rear cover.
6-12
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
Backwash2" 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 stream2.
▪ Press the Reset key to
clear the fault.
▪ Eject the ink to restart the
IJ printer.
1
(*1): When you replace EZJ125 board,
refer to [Replacement procedures
of EZJ125 board] in
board (Nozzle1 drive board)"
(*2): When you replace EZJ133 board,
[Replacement procedures
refer to
of EZJ133 board] in
board (MPU board)".
(*3): When you replace the printhead,
"4.13
refer to
Replacement Procedure".
[Caution]
Be sure to check that there is no wrong
connection of harnesses by referring to
[Connector numbers and Identifying
method of harnesses]
Electrical Connection Diagram".
"3.3.5 EZJ125
.
"3.3.1 EZJ133
Print Head
in "3.3.20