Hitachi UX Twin Nozzle Service Manual page 304

6.3.21 Ink Level Sensor Broken (1)(3)
Ink Level Sensor
Broken (1)(3)
Go to "Level sensor confirmation"
screen and check if all sensors in Ink
reservoir work properly.
Turn OFF
power.
Any disconnection or
poor connection is found
at CN13 connector on
EZJ133 board or CN1 or
CN4 connector on
EZJ138 board?
No
Does the connection
harness have
electrical continuity?
Yes
Is ink deposition observed
between ground electrode
and sensor 1,2 or 3
electrode in Ink reservoir?
(check it by removing
harness and reconnecting)
No
Replace EZJ133 board.*1
(*1): 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".
Yes
Disconnect the connector once,
and then reconnect it properly.
No
Replace the connection harness
Yes
Remove the ink deposition
on the electrodes and/or
in-between surface, OR
replace the sensor block of
Ink reservoir.
Restart IJ printer and
go to "Level sensor
confirmation" screen
and check if all sensors
No
in Ink reservoir work
properly.
6-62
Yes
END