Hitachi IJ UX Service Manual page 148

6 Remove the fastener fastening the pressure sensor to the joint and remove
the pressure sensor by pulling.
[Caution] Put wiping paper under the Pressure sensor for ink dripping.
Joint
7 After cleaning the portion stained with ink, wet the new O-ring with makeup and mount
on the joint.
Joint
8 Insert the pressure sensor to the joint and fix it with the fastener that was removed
in step 6.
[Caution] Use a new O-ring.
Mount carefully so that the O-ring does not fall out or is not pinched.
9 Return the unit to its original state by performing the procedures in reverse order.
10 Eject ink and make sure the ink pressure is normal.
Fastener
O-ring 7.5
4-15
Pressure sensor