Hitachi IJ RX2 Service Manual page 230

6.5.5 Disordered characters
Disordered
characters
Are the upper or
lower print dots
lost?
Is the upper end of
the print blotted?
There is a noise on
APH wave farm.
Yes
Confirm the print result
With the printhead removed
From customer's equipment.
.
Yes
normal prints are
obtained?
Yes
Ask your customer to
Remove any vibration.
Ensure that the work surface is
free from coating application
irregularities, water drops, dirt,
oil, and other foreign matter.
NOTICE
Do not repeat the nozzle backwash procedure more than two times.
If it is repeated to an excess, the ink becomes thin, thereby causing
disordered prints. If the ink is thin and disordered prints are
encountered, replace the ink.
Yes
No
Yes
No
No
No
Since it is conceivable that the
ink flow path may be clogged,
clean the ink final filter and
joints, backwash the nozzle,
and disassemble and clean the
nozzle.
6-51
See under "Chipped
print".
Is the operating
No
temperature with the
specified limits?
Ensure that the operating
Yes
temperature is within the
specified limits.
No
Are ink drops
properly generated?
Adjust the excitation voltage
Yes
and pressure to ensure
proper ink drops
generation.
No
Are normal prints
Yes
obtained?
No
Replace the ink.
Resume the
operation.
Are normal prints
obtained?
Yes