Hitachi PB - No Ink Ejection from Nozzle

6-45
  6.5.8 No ink ejection from nozzle

Execute the nozzle
backwash function.
Remove the orifice plate
from the nozzle, subject it
to ultrasonic cleaning, and
put it back on the nozzle.
No
No ink ejection
from nozzle
Replace three-way
solenoid valve MV9.
Replace the MGV
filter.
Replace the circulation unit.
Y
es
＊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.
Is the problem
fixed?
No
Y
es
No
Y
es
No
No
Is the EZJ93 board
CN2 connector,
j
unction connector,
or supply pump CN1
connector
disconnected?
Replace the
EZJ93 board.
Y
es
No
Is the supply
pump running?
No
Y
es
Does three-way
solenoid valve
MV9 operate?
No
Y
es
Y
es
Replace the
pressure-
reducing valve.
Replace the
circulation unit.
Connect any
disconnected connector.
Y
es
Does the pressure
gauge show the
specified value?
No
Y
es
No
Y
es
No
Y
es
Resume the
operation.
Is the problem
fixed?
Is the problem
fixed?
Is the problem
fixed?
Is the problem
fixed?
Is the problem
fixed?
Is the problem
fixed?
Replace the ink filter