Hitachi PB - Page 85

4-23
symptom Probable cause
Check method
Repairing method
The circulation
pump
malfunctions.
The same as “Ink does not jet".
The solenoid
valve
malfunctions
※MV4
malfunctions.
When “Release” is
executed on the
Solenoid
Valve/Pump Test
screen, no
operation sound is
produced.
Replace or repair the
solenoid valve (MV3).
Refer to “4.12
Repairing method
when the circulation
route dry or sticks”.
The circulation
route clogs.
Clogging in the
pipe or joint
The nozzle can be
flushed reversely
and MV4 can be
operated
normally.
Refer to “4.12
Repairing method
when the circulation
route dry or sticks”.
A
viscometer
error
occurs.
Viscometer
failure
Except the above
Refer to “4.9
Viscometer
Replacement
Procedure”.
The
circulating
pump
malfunctions.
The same as “Ink does not jet".
Backwash
is
impossible.
The solenoid
valve
malfunctions.
※MV5
malfunctions
.
When “Release” is
executed on the
Solenoid
Valve/Pump Test
screen, no
operation sound is
produced.
Replace or repair the
solenoid valve (MV5).
Refer to “4.12
Repairing method
when the circulation
route dry or sticks”.
The
pressure
drops
during
normal
operation.
The solenoid
valve
malfunctions.
※MV2
malfunctions
.
When “Release” 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”.
The supply
pump
malfunctions.
The same as “Ink does not jet.
The solenoid
valve
malfunctions.
※MV6
malfunctions.
When “Release” is
executed on the
Solenoid
Valve/Pump Test
screen, no
operation sound is
produced.
Replace or repair the
solenoid valve (MV6).
Refer to “4.12
Repairing method
when the circulation
route dry or sticks”.
Charging
or drainage
is
impossible.
The circulation
route clogs.
Clogging in the
pipe or joint
Except the above
Refer to “4.12
Repairing method
when the circulation
route dry or sticks”.