Hitachi IJ PH Service Manual page 106

8 Remove the fixing screws at 4 positions that fix the circulation unit.
The circulation unit can be removed.
Fixing screw
9 Clean the portion stained with ink and then install the main ink tank by
reversing the above procedure.
10 Perform "Makeup ink refill" and then "Ink refill".
Make sure that any ink or makeup ink leak does not occur at each
connecting part.
4-17
Fixing screw