Hitachi IJ RX2 Service Manual page 155

Symptom
The supply
pump
malfunctions.
The ink The solenoid
pressure valve
does not malfunctions.
increase.
Others
Ink Over Fill The solenoid
often valve
occurs. malfunctions.
Probable cause
The same as "Ink does not jet".
* MV1
malfunctions.
* MV2
malfunctions.
* MV9
malfunctions.
The pressure
resistance of MV6
is faulty.
* The pressure
sensor
malfunctions.
The pressure
resistance of MV7
is faulty.
The pressure
resistance of MV8
is faulty.
The pressure
resistance of MV2
is faulty.
Check method
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.
When "Open" is
executed on the
Solenoid Valve/Pump
Test screen, no
operation sound is
produced.
When the pump and
then MV1 are turned on,
ink flows to the collation
tube. (Solenoid
Valve/Pump Test
screen)
Ink jets and printing can
be performed but the
pressure value is
abnormal.
The makeup in the pipe
N is sucked even during
operation (except at
supply). (Make a check
after removing the tube
connection block of the
makeup reservoir.)
The makeup jets and
cannot be stopped "at
non-cleaning stop".
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.)
4-31
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).