Hitachi UX Twin Nozzle Service Manual page 290

6.3.1b (N2) Ink Drop Charge Too High
Ink Drop Charge
Too High
Is the gutter
section soiled?
No
Is the ink
recovered without
filling the gutter
hole with it?
Yes
Is any vibration or shock applied
to the IJ printer, print head, or
print head cable during operation
or startup?
No
Does the IJ printer become ready
for printing when you eject ink
and start the IJ printer with the
high voltage power supply2 unit
high voltage output FASTON
terminal disconnected?
No
Has the ink/makeup entered inside
the print head rear cover?
(See the section on print head
operation and replacement.)
No
Replace the EZJ134 board.*1
If the problem is
not fixed:
Replace the EZJ133 board.*2
If the problem is
not fixed:
Replace the EZJ135 board.*3
If the problem is
not fixed:
Replace the print head.*4
Clean the gutter section and its surrounding
area with a cleaning solution. (When using
carbon type ink, remove the deflection plate,
charge plate and gutter, then clean the
Yes
mounting base surface as mentioned on
"Handling guidance of each ink; item 6, Print
head cleaning".
Refer to "6.5.18 No ink
No
suction from gutter".
Yes
Eliminate the cause of
vibration or shock.
Yes
Replace the high-voltage
power supply2.*5
Yes
Wipe the entered
ink/makeup away with
JK wiper and allow the
print head rear surface to
thoroughly dry.
6-48
Does the IJ printer
become ready for
Yes
printing when you
initiate ink ejection
and start it?
No
Is the ink drop
No
shape good?
Yes
Change the excitation
voltage setting to assure
proper ink drop shape.
(*1): When you replace EZJ125 board,
refer to [Replacement procedures
of EZJ125 board] in "3.3.5 EZJ125
board (Nozzle1 drive board)".
(*2): When you replace EZJ133 board,
refer to [Replacement procedures
of EZJ133 board] in "3.3.1 EZJ133
board (MPU board)".
(*3): When you replace EZJ135 board,
refer to "5.7 APH board (EZJ135)
replacement".
(*4): When you replace the printhead,
refer to "4.13 Print Head
Replacement Procedure".
(*5): When you replace High voltage
power
[Replacement procedures of high
voltage power supply] in "3.3.16
High Voltage Power Supply 1 and
2".
[Caution]
Be sure to check that there is no wrong
connection of harnesses by referring to
[Connector
method of harnesses] in "3.3.20 Electrical
Connection Diagram".
Resume the
operation.
supply 2, refer to
numbers and Identifying