Hitachi PB - Chipped Print (Upper Dots)

6-39
6.5.2 Chipped print (upper dots)
※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.
Missing
dots
Y
es
Perform reverse cleaning of
nozzle, and then disassemble
the nozzle and clean it.
No
Chipped print
Adjust the ink beam
position so that the ink
beam is centered with
respect to the gutter.
No
Is the ink beam
positioned at the
center of the gutter?
Y
es
Is the ink pressure
lower than the
specified limit?
No
Y
es
Is it possible to make
normal prints with the
ink pressure raised
above the specified
limit?
Pour the intensifier over
the deflection electrode to
clean it.
No
Is there any ink or dirt
buildup on the plus
deflection electrode?
Y
es
Direction of
deflection
Y
es
No
Does the ink beam pass
through the center of
charge electrode?
A
djust the ink beam so that
it passes through the center
of charge electrode.
Adjust the ink pressure
until it is within the l
imits.
Can the ink pressure be
adjusted?
No
Y
es
Resume the
o
p
eration.
Replace the ink.
Can normal
prints be made?
No
Y
es
The ink flow path may be
clogged: Clean the joint or
replace the filter.
Can the ink pressure be
adjusted?
Provide pressure relief and
then replace the pressure-
reducing valve.
Is the charged voltage
output correctly?
Y
es
No
No
Replace the EZJ94 board / EZJ106 board.