Hitachi IJ PH, Service Manual

Page: 115 / 211

4-26
Symptom Probable cause
Check method
Repairing method
The supply
pump
malfunctions.
The same as “Ink does not jet".
* MV1
malfunctions.
When “Open” is
executed on the
Solenoid
Valve/Pump Test
screen, no operation
sound is produced. Replace or repair the
solenoid valve
(MV1). Refer to
“4.12 Repairing
method when the
circulation route dry
or sticks”.
* MV2
malfunctions.
When “Open” is
executed on the
Solenoid
Valve/Pump Test
screen, no operation
sound is produced. Replace or repair the
solenoid valve
(MV2). Refer to
“4.12 Repairing
method when the
circulation route dry
or sticks”.
* MV9
malfunctions.
When “Open” is
executed on the
Solenoid
Valve/Pump Test
screen, no operation
sound is produced.
Replace the solenoid
valve (MV9).
The solenoid
valve
malfunctions.
The pressure
resistance of
MV6 is faulty.
When the pump and
then MV1 are turned
on, ink flows to the
collation tube.
(Solenoid
Valve/Pump Test
screen)
Replace the solenoid
valve (MV6).
The ink
pressure
does not
increase.
Others
* The pressure
sensor
malfunctions.
Ink jets and printing
can be performed
but the pressure
value is abnormal.
Replace the pressure
sensor.
The pressure
resistance of
MV7 is faulty.
The makeup ink in
the pipe N is sucked
even during
operation (except at
supply). (Make a
check after
removing the tube
connection block of
the makeup ink
reservoir.)
Replace the solenoid
valve (MV7).
The pressure
resistance of
MV8 is faulty.
The makeup ink jets
and cannot be
stopped “at
non-cleaning stop”.
Replace the solenoid
valve (MV8).
Ink Over
Fill often
occurs. The solenoid
valve
malfunctions.
The pressure
resistance of
MV2 is faulty.
The ink in the pipe
M is sucked even
during operation
(except at supply).
(Make a check after
removing the tube
connection block of
the ink reservoir.)
Replace the solenoid
valve (MV2).