Hitachi UX Twin Nozzle Service Manual page 199

Trouble
Probable cause
symptom
CV assembly
malfunctions.
Charging or
drainage is
impossible.
The
circulation
route clogs.
The makeup
pump
malfunctions.
Makeup in
Nozzle 1 is
The solenoid
not ejected.
valve
malfunctions.
The makeup
pump
malfunctions
Makeup in
Nozzle 2 is
The solenoid
not ejected.
valve
malfunctions
The supply
pump
malfunctions.
The solenoid
The ink
valve
pressure of
malfunctions.
Nozzle 1
does not
increase.
Others
Check method
CV assembly is In cases other than
dry or sticks. three cases above .
Clogging in the In cases other than
pipe or joints four cases above.
Follow the same descriptions as those of "The supply pump
malfunctions" above. However, replace the makeup pump head
instead.
When "Open" is
executed on "Solenoid
* MV8
Valve/Pump Test"
malfunctions.
screen, no operation
sound is produced.
Follow the same descriptions as those of "The supply pump
malfunctions" above. However, replace the makeup pump head
instead.
When "Open" is
executed on "Solenoid
* MV28
Valve/Pump Test"
malfunctions.
screen, no operation
sound is produced.
Follow the same descriptions as those of "Ink in Nozzle 1 is not
ejected".
When "Open" is
executed on "Solenoid
* MV1
Valve/Pump Test"
malfunctions.
screen, no operation
sound is produced.
When "Open" is
executed on "Solenoid
* MV2
Valve/Pump Test"
malfunctions.
screen, no operation
sound is produced.
When "Open" is
executed on "Solenoid
* MV9
Valve/Pump Test"
malfunctions.
screen, no operation
sound is produced.
When the pump 1 and
then MV1 are turned
The pressure
on, ink flows to the
resistance of
recovery tube.
MV6 is faulty.
(Solenoid Valve/Pump
Test screen)
Ink ejects and printing
* The pressure
can be performed but
sensor
the pressure value is
malfunctions.
abnormal.
4-65
Repairing method
Refer to "4.15
Repairing method
when the circulation
route is dry or sticks".
Refer to "4.15
Repairing method
when the circulation
route is dry or sticks".
Replace the solenoid
valve (MV8). Refer to
"4.15 Repairing
method when the
circulation route is
dry or sticks".
Replace the solenoid
valve (MV28). Refer
to "4.15 Repairing
method when the
circulation route is
dry or sticks".
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 "4.15
Repairing method
when the circulation
route dry or sticks".
Replace the solenoid
valve (MV9).
Replace the solenoid
valve (MV6).
Replace the pressure
sensor. Refer to
"4.6.1 Pressure
Sensor (Nozzle 1)
Replacement
Procedure".