Hitachi UX Twin Nozzle - Page 331

6-89
No ink ejection
from nozzle1
[Caution]
1. Do not repeat the nozzle backwash procedure more than two times.
If it is repeated in excess, the ink becomes thin, thereby causing
disordered prints.backwash
2. If the ink is thin and printings become disordered, replace the ink.
Execute the “Nozzle
Backwash1” function.
Remove the orifice plate
from the nozzle, subject it
to ultrasonic cleaning, and
put it back on the nozzle.
No
Replace shutoff
valve MV9.
Replace the circulation unit.
Yes
No
No
Is the EZJ133 board
CN13 connector,
EZJ138 board CN1, 3,
4 and 6 connector, or
pump motor connector
disconnected?
Replace the
EZJ133 board.*2
Yes
No
Is the pump
motor running?
Does shutoff valve
MV9 operate?
No
Yes
Yes
Replace the pressure-
reducing valve.
Replace the
circulation unit.
Connect any
disconnected connector.
Yes
Is ink pressure of
nozzle1 set to the value
specified?
No
Yes
No
Yes
No
Yes
Replace the ink filter.
Replace the MV1 and 2
No
Yes
Repair the troubled
solenoid.
Yes
No
Is the Ink flowing
from the Ink filter ”C”
motor running?
Yes
Is the Ink flowing from
the Reducing valve ”C”
running?
No
Yes
No
Is there the conduction
of the fuse [FR2] of the
EZJ125 board?
No
Replace the
EZJ125 board.*1
6.5.8a (N1) No ink ejection from nozzle1
Is the problem
fixed?
No
Yes
No
Yes
Resume the
operation.
Is the problem
fixed?
Is the problem
fixed?
Is the problem
fixed?
Is the problem
fixed?
Is the problem
fixed?
Is MV1 and 2
sticking?
Replace the connection
harness.
Is the problem
fixed?
Yes
No
Yes
No
Is the connection
harness conducting?
Is the problem
fixed?
(*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)”.
[Caution]
Be sure to check that there is no wrong connection of
harnesses by referring to [Connector numbers and
Identifying method of harnesses] in “3.3.20 Electrical
Connection Diagram”.