Troubleshooting Procedure For The Circulation System - Hitachi IJ RX2 Service Manual

4.11 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) 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 jet.
Makeup
does not
circulate.
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
pump
The same as "The supply pump malfunctions".
malfunctions
.
The
solenoid
* MV8
valve
malfunctions.
malfunctions
.
Status check
The motor does not
rotate.
A crack or friction
powder is found on
the cam.
The piston cannot
follow the cam
motion.
The solenoid valve
is operated but
charging and
discard are not
completed within the
specified time.
The solenoid valve
is operated but ink
does not flow.
When "Open" is
executed on the
Solenoid
Valve/Pump Test
screen, no operation
sound is produced.
When "Open" is
executed on the
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
practice, makeup
does not flow to the
tube of circulation
route.
When "Open" is
executed on the
Solenoid
Valve/Pump Test
screen, no operation
sound is produced.
4-30
Repairing method
Replace the motor.
Replace the pump
unit.
Replace the pump
unit.
If this trouble cannot
be repaired by
repeating the
operation and stop,
replace the pump
unit.
Refer to "4.12
Repairing method
when the circulation
route dry or sticks".
Replace or repair the
solenoid valve (MV1).
Refer to "4.12
Repairing method
when the circulation
route dry or sticks".
Replace the solenoid
valve (MV9).
Refer to "4.12
Repairing method
when the circulation
route dry or sticks".
Clean the orifice
plate with ultrasonic
cleaning.
Replace the solenoid
valve (MV8).