Hitachi IJ UX Service Manual page 283

6.5.8 No ink ejection from nozzle
Yes
Execute the nozzle
backwash function.
Yes
Is the problem
fixed?
No
Remove the orifice plate
from the nozzle, subject it
to ultrasonic cleaning, and
put it back on the nozzle.
Yes
Is the problem
fixed?
No
Does three-way
solenoid valve
MV9 operate?
No
Replace three-way
solenoid valve MV9.
Yes
Is the problem
fixed?
No
Replace the MGV
filter.
Yes
Is the problem
fixed?
No
Replace the circulation unit.
Resume the
operation.
No ink ejection
from nozzle
Does the on-screen
No
pressure reading
represent the specified
value?
Is the pump
motor running?
Is the Ink flowing
from the Ink filter "C"
Replace the ink filter
Yes Is the problem
fixed?
Is the Ink flowing from
the Reducing valve "C"
Yes
Replace the pressure-
reducing valve.
Yes
Is the problem
fixed?
No
Is MV1,2,4
sticking?
Repair the troubled
solenoid
Replace the MV1,2,4.
6-65
No
Yes
Is the EZJ126 board
CN13 connector,
Yes
EZJ132 board CN3
connector, or pump
motor connector
No
disconnected?
No
Yes
No
Connect any
disconnected connector.
Yes
Is the problem
No
fixed?
No
Replace the
Yes
EZJ126 board.
Yes
Is the problem
fixed?
Replace the
circulation unit.
NOTICE
1.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.
2.If the ink is thin and disordered prints
are encountered, replace the ink.
No
Is the connection
harness conducting?
Yes
No
Replace the connection
harness
Is the problem
fixed?
No
No
Yes
Yes