Hitachi UX Twin Nozzle Service Manual page 248

6.2.2 Main Ink Tank Too Full
Main Ink Tank Too Full
Open the maintenance cover.
Is the ink main tank full
of ink? *1
No
Turn OFF the power and then
pull out the sensor .
Is there a creepage leak
between the ground
electrode and the over fill
electrode of liquid level
detection of the main tank?
(Check it by mounting and
removing the harness.)
No
Replace the EZJ133 board. *2
(*1)： Liquid level can be confirmed by the height of the ink in the drain tube as a guidance.
[Note]
If there is an air bubble in the drain tube, remove the air first and check the liquid level.
(*2)： When you replace EZJ133 board, refer to
board (MPU board)".
[Caution]
Be sure to check that there is no wrong connection of harnesses by referring to
Identifying method of harnesses]
Is the initial-level sensor
ON?
Yes Has the Main Ink
Tank Too Fill fault
frequently occurred?
Replace the MV7 (makeup
valve) unit.
Yes
Remove the ink
adhering onto the
creepage surface
between the two
electrodes. Or replace
the sensor part of the
main ink tank.
No
Is the fault cleared
by power-on reset?
[Replacement procedures of EZJ133 board]
"3.3.20 Electrical Connection Diagram".
in
6-6
No
Yes
Check the initial-
level sensor
No
connection again and
correct it if necessary.
Yes
Drain the ink from the
ink main tank, and clear
the fault by pressing
the Clear key.
Execute "Ink Drainage"
and "ink refill"
procedure, and confirm
that ink is refilled to
initial level of ink main
tank.
Yes
[Connector numbers and
END
"3.3.1 EZJ133
in