Hitachi IJ UX Service Manual page 180

Symptom Probable cause
The recovery
pump
malfunctions.
The solenoid
valve
malfunctions.
No
recovery
The recovery
route clogs.
The
circulation
pump
malfunctions.
The solenoid
A
valve
viscometer
malfunctions
error
occurs.
The
circulation
route clogs.
Viscometer
failure
The
circulating
pump
malfunctions.
Backwash
is
impossible.
The solenoid
valve
malfunctions.
The
pressure
The solenoid
drops
valve
during
malfunctions.
normal
operation.
Check method
Follow the same descriptions as those of "The supply pump
malfunctions ".
When "Open" is
executed on
* MV3
"Solenoid
Valve/Pump Test"
malfunctions.
screen, no operation
sound is produced.
Clogging in A lot of foreign
the recovery materials stick on
filter the recovery filter.
Suck is performed
Clogging in when the tube
the pipe or connected to the
joint recovery filter is
removed.
Follow the same descriptions as those of "The supply pump
malfunctions ".
When "Open" is
executed on
* MV4 "Solenoid
malfunctions. Valve/Pump Test"
screen, no operation
sound is produced.
The nozzle can be
Clogging in
flushed reversely
the pipe or
and MV4 can be
joint
operated normally.
In cases other than three cases
above.
Follow the same descriptions as those of "The supply pump
malfunctions ".
When "Open" is
executed on
* MV5
"Solenoid
Valve/Pump Test"
malfunctions.
screen, no operation
sound is produced.
When "Open" is
executed on
* MV2
"Solenoid
Valve/Pump Test"
malfunctions.
screen, no operation
sound is produced.
4-47
Repairing method
Replace or repair the
solenoid valve (MV3).
Refer to "4.15
Repairing method
when the circulation
route is dry or sticks".
Replace the recovery
filter.
Press makeup into the
end of the recovery
filter connecting tube
by applying pressure
with a hand pump.
- Hand pump
specifications
Part name:
Nozzle cleaning
assembly
Part No.: 451000
Replace or repair the
solenoid valve (MV4).
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
viscometer".
Replace or repair the
solenoid valve (MV5).
Refer to "4.15
Repairing method
when the circulation
route is dry or sticks".
Replace or repair the
solenoid valve (MV2).
Refer to "4.15
Repairing method
when the circulation
route is dry or sticks".