Hitachi IJ UX Service Manual

4-45
4.14 Troubleshooting Procedure for the Circulation System
Perform “(1) Fault locating and repairing method” for each trouble symptom.
For the items marked * in “Probable Cause”, perform “(2) Fault locating method for the control
system/circulation system” to make sure that the control system is normal, and then perform the repair
work.
(1) Fault locating and repairing method
Trouble
symptom
Probable cause Status check Repairing method
Ink does
not eject.
The supply
pump
malfunctions
.
* The motor
malfunctions.
The motor does not
rotate.
Replace the motor.
The drive cam
is damaged.
A crack or powder
abrasion is found on
the cam.
Replace drive unit
The follow
operation of the
stroke is faulty.
The piston cannot
follow the cam
motion.
Replace supply pump
head
Foreign
materials are
mixed in the
check valve.
The solenoid valve is
operated but
charging and
drainage are not
completed within the
specified time.
When the fault is not
recovered by repeating
“startup” and
“shutdown”, replace the
supply pump head.
The check
valve is dry or
sticks.
The solenoid valve is
operating but ink
does not flow.
Refer to “4.15
Repairing method
when the circulation
route is dry or sticks”.
The solenoid
valve
malfunctions
.
* MV1
malfunctions.
When “Open” is
executed on
“Solenoid
Valve/Pump Test”
screen, no operation
sound is produced.
Replace or repair the
solenoid valve (MV1).
Refer to “4.15
Repairing method
when the circulation
route is dry or sticks”.
* MV9
malfunctions.
When “Open” is
executed on
“Solenoid
Valve/Pump Test”
screen, no operation
sound is produced.
Replace the solenoid
valve (MV9).
The supply
route clogs.
Clogging in the
pipe or joint.
The operation sound
of MV1 and MV9 is
produced, but ink
does not flow.
Refer to “4.15
Repairing method
when the circulation
route is dry or sticks”.
Clogging in the
orifice plate.
When backwash
conducted, makeup
does not flow to the
tube of circulation
route.
Clean the orifice plate
with ultrasonic
cleaning.
Makeup
does not
eject.
The makeup
pump
malfunctions
.
Follow the same descriptions as those of “The supply pump
malfunctions" above. However, replace the makeup pump
head instead.
The solenoid
valve
malfunctions
.
* MV8
malfunctions.
When “Open” is
executed on
“Solenoid
Valve/Pump Test”
screen, no operation
sound is produced.
Replace the solenoid
valve (MV8).

Hitachi IJ UX Specifications

General

Brand	Hitachi
Model	IJ UX
Category	Printer
Language	English