Varying Character Height - Hitachi IJ PH Service Manual

6.5.3 Varying character height

Yes
Optimize the clearance
between the nozzle head
end and print target.
Yes
Adjust the character
height setting.
Yes
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.
Yes
Are normal prints
obtained?
No
Replace the ink.
Adjust the charge voltage.
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.
Varying character
height
Is optimum clearance
provided between the
nozzle head end and print
target?
No
Was the character
height setting
changed?
No
Is the ink pressure
within the specified
range?
No
Is the normal height
obtained when the ink
pressure is raised above
the specified limit?
No
Is the charge
No
voltage properly
adjusted?
Yes
Resume the
operation.
6-45
Yes
Can the ink pressure be
adjusted?
No
Provide pressure relief and
then replace the pressure-
reducing valve.
Yes
Adjust the ink
pressure until it is
within the limits.