Hitachi UX Twin Nozzle - Page 328

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6.5.5 Disordered characters
[Caution]
Do not repeat the nozzle backwash procedure more than two times.
If it is repeated in excess, the ink becomes thin, thereby causing disordered prints.
if the ink is thin and printings become disordered, replace the ink.
There is a noise on
APH wave farm.
Yes
No
Confirm the print result
with the printhead removed
from customer’s equipment.
.
Are normal prints
obtained?
Yes
No
Ask your customer to
remove any vibration.
Yes
Disordered
characters
Are the upper or
lower print dots
lost?
No
Yes
Is the upper end of
the print blotted?
No
Yes
Adjust the excitation voltage
and pressure to ensure
proper ink drops
generation.
Are ink drops
properly generated?
Yes
No
See under “Chipped
print”.
Ensure that the operating
temperature is within the
specified limits.
Is the operating
temperature with the
specified limits?
Yes
No
Ensure that the work surface is
free from coating application
irregularities, water drops, dirt,
oil, and other foreign matter.
Resume the
operation.
Are normal prints
obtained?
No
Yes
Replace the ink.
Are normal prints
obtained?
No
Yes
Since it is conceivable that the
ink flow path may be clogged,
replace the ink filter and MGV
filter, clean joints, backwash the
nozzle, and disassemble and
clean the nozzle.