Hitachi IJ RX2 Service Manual page 138

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 to provide for an ink drip.
Joint
7 After cleaning the portion dirtied by ink, wet the new O-ring with makeup and mount
on the joint.
Joint
8 Insert the pressure sensor and fasten to the joint with the fastener that was removed
in step 6.
"Caution" Use a new O-ring.
Mount carefully so the O-ring does not fall out or catch.
9 Return the unit to its original state by performing the procedure in reverse order.
10 Dispense ink and make sure the ink pressure is normal.
Fastener
O-ring 7.5
4-14
Pressure sensor