Troubleshooting Procedure For The Circulation System - Hitachi IJ UX Service Manual

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
Ink does
not eject.
Makeup
does not
eject.
Probable cause
* The motor
malfunctions.
The drive cam
is damaged.
The follow
operation of the
The supply stroke is faulty.
pump
malfunctions
Foreign
.
materials are
mixed in the
check valve.
The check
valve is dry or
sticks.
* MV1
malfunctions.
The solenoid
valve
malfunctions
.
* MV9
malfunctions.
Clogging in the
pipe or joint.
The supply
route clogs.
Clogging in the
orifice plate.
The makeup
Follow the same descriptions as those of "The supply pump
pump
malfunctions" above. However, replace the makeup pump
malfunctions
head instead.
.
The solenoid
valve * MV8
malfunctions malfunctions.
.
Status check
The motor does not
rotate.
A crack or powder
abrasion is found on
the cam.
The piston cannot
follow the cam
motion.
The solenoid valve is
operated but
charging and
drainage are not
completed within the
specified time.
The solenoid valve is
operating but ink
does not flow.
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.
The operation sound
of MV1 and MV9 is
produced, but ink
does not flow.
When backwash
conducted, makeup
does not flow to the
tube of circulation
route.
When "Open" is
executed on
"Solenoid
Valve/Pump Test"
screen, no operation
sound is produced.
4-45
Repairing method
Replace the motor.
Replace drive unit
Replace supply pump
head
When the fault is not
recovered by repeating
"startup" and
"shutdown", replace the
supply pump head.
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 is dry or sticks".
Replace the solenoid
valve (MV9).
Refer to "4.15
Repairing method
when the circulation
route is dry or sticks".
Clean the orifice plate
with ultrasonic
cleaning.
Replace the solenoid
valve (MV8).