Hitachi IJ PH Service Manual page 115

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