Hitachi IJ UX Service Manual page 179

Symptom
The supply
pump
malfunctions.
The ink The solenoid
pressure valve
does not malfunctions.
increase.
Others
Ink Over Fill The solenoid
often valve
occurs. malfunctions.
Probable cause
Follow the same descriptions as those of "Ink does not eject".
* MV1
malfunctions.
* MV2
malfunctions.
* MV9
malfunctions.
The pressure
resistance of MV6
is faulty.
* The pressure
sensor
malfunctions.
The pressure
resistance of MV7
is faulty.
The pressure
resistance of MV8
is faulty.
The pressure
resistance of MV2
is faulty.
Check method
When "Open" is
executed on "Solenoid
Valve/Pump Test"
screen, no operation
sound is produced.
When "Open" is
executed on "Solenoid
Valve/Pump Test"
screen, no operation
sound is produced.
When "Open" is
executed on "Solenoid
Valve/Pump Test"
screen, no operation
sound is produced.
When the pump and
then MV1 are turned on,
ink flows to the collation
tube. (Solenoid
Valve/Pump Test
screen)
Ink ejects and printing
can be performed but
the pressure value is
abnormal.
The makeup in the pipe
N is sucked even during
operation (except at
supply). (Remove the
tube connection block of
the makeup reservoir
and check.)
The makeup ejects and
cannot be stopped "at
non-cleaning stop".
The ink in the pipe M is
sucked even during
operation (except at
supply). (Remove the
tube connection block of
the ink reservoir and
check.)
4-46
Repairing method
Replace or repair the
solenoid valve (MV1).
Refer to "4.15 Repairing
method when the
circulation route dry or
sticks".
Replace or repair the
solenoid valve (MV2).
Refer to "4.12 Repairing
method when the
circulation route dry or
sticks".
Replace the solenoid
valve (MV9).
Replace the solenoid
valve (MV6).
Replace the pressure
sensor.
Replace the solenoid
valve (MV7).
Replace the solenoid
valve (MV8).
Replace the solenoid
valve (MV2).