Hitachi UX Twin Nozzle Service Manual page 260

6.2.8 Makeup Replenishment Time-out
Makeup Replenishment
Time-out
Does the MV7 (Makeup valve)
operate on the solenoid
valve/pump test screen?
Yes
①
The makeup does not flow into
the main ink tank from the
makeup reservoir when Pump
and MV7 are operated on the
solenoid valve/Pump test screen
Yes
Refer to 4.14 Trouble shooting
Procedure for the Circulation System,
Probable cause : The makeup pump
malfunctions, and Then, repair or replace
Makeup Pump.
Does the initial-level
sensor operate?
No
Is CN13 or CN22 of the EZJ133
board, CN1, CN2, CN4, or CN5
of or EZJ138 board disconnected?
No
Disconnect the connectors, then
reconnect them (6 connectors).
Does the Initial-level
sensor operate?
No
Is the connection harness
conducting?
Yes
Is the fault cleared by
power-on reset?
No
Replace the EZJ133 board*1.
[Caution]
If you remove the solenoid valve or other piping part without relieving the pressure from the path, the ink may gush
out. Before performing the above steps, be sure to provide pressure relief.
No
Replace the connection
harness
No
Yes
Yes
Connect the connector.
Yes
No
Replace the harness.
Yes
Resume the
6-18
Does the MV7 operate when
the connector of the other
operating solenoid valve is
Yes
connected to MV7?
Replace MV7 or clean any ink
build up or other foreign
matters on MV7.
(*1): When you replace EZJ133 board, refer to
[Replacement procedures of EZJ133 board]
"3.3.1 EZJ133 board (MPU board)".
[Caution]
Be sure to check that there is no wrong connection of
harnesses by referring to
Identifying method of harnesses]
Connection Diagram".
operation.
No
①
[Connector numbers and
"3.3.20 Electrical
in
in