Hitachi UX Twin Nozzle Service Manual page 198

Trouble
Probable cause
symptom
The supply
pump
malfunctions.
The solenoid
Ink in
valve
Nozzle 2 is
malfunctions.
not ejected.
The supply
route clogs.
The supply
pump
malfunctions.
The solenoid
valve
Charging or
malfunctions.
drainage is
impossible.
The solenoid
valve
malfunctions.
Check method
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
* MV29
Valve/Pump Test"
malfunctions.
screen, no operation
sound is produced.
The operation sound of
Clogging in the MV1 and MV29 is
pipe or joint. produced, but ink does
not flow.
When backwash
conducted, makeup
Clogging in the
does not flow to the
orifice plate.
tube of circulation
route.
Follow the same descriptions as those of "Ink in Nozzle 1 is not
ejected".
When "Open" is
executed on "Solenoid
* MV2
Valve/Pump Test"
malfunctions.
screen, no operation
sound is produced.
When "Open" is
executed on "Solenoid
* MV6
Valve/Pump Test"
malfunctions.
screen, no operation
sound is produced.
4-64
Repairing method
Replace or repair the
solenoid valve (MV1).
Refer to "4.15 Repairing
method when the
circulation route is dry or
sticks".
Replace the solenoid
valve (MV29).
Refer to "4.15 Repairing
method when the
circulation route is dry or
sticks".
Clean the orifice plate
with ultrasonic cleaning.
Replace or repair the
solenoid valve (MV2).
Refer to "4.15 Repairing
method when the
circulation route is dry or
sticks".
Replace or repair the
solenoid valve (MV6).
Refer to "4.15 Repairing
method when the
circulation route is dry or
sticks".