Ink Pressure Low - Hitachi IJ PH Service Manual

6.4.6 Ink Pressure Low

Ink Pressure Low
Check the indicated value and
standard value of the ink
pressure on the Operation
management screen.
Is it below the lower limit?
(Indicated value < standard
value x 0.90)
No
Is the warning released?
Yes
Resume the
operation.
Yes
Yes
Yes
Yes
Turn the shaft at the center
of the pressure reducing
valve in the opposite
direction, and raise the
pressure to be within the
upper and lower limits.
No
6-37
Can the pressure be
adjusted by the
pressure reducing
valve?
No
Replace the three-way valve
filter.
Can the pressure be
adjusted by the
pressure reducing
valve?
No
Replace the pressure reducing
valve.
Can the pressure be
adjusted by the
pressure reducing
valve?
No
Replace the pressure sensor.