No Ink Ejection From Nozzle - Hitachi IJ PH Service Manual

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 supply
pump running?
Replace the ink filter
Yes
Is the problem
fixed?
Replace the
pressure-
reducing valve.
Yes
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.
6-50
No
Yes
Is the EZJ93 board
CN2 connector,
junction connector,
or supply pump CN1
connector
disconnected?
Yes
Connect any
disconnected connector.
No
Yes
Is the problem
fixed?
No
Replace the
EZJ93 board.
Yes
Is the problem
fixed?
No
Replace the
circulation unit.
No