Hitachi IJ PH Service Manual page 94

5 Remove the fixing screws (4 positions) of the main ink tank and take out
the main tank.
"Caution" Put wiping paper under the main ink tank to provide for an ink
drip.
Main ink tank
Fixing screw
6 Clean the portion stained with ink and then install the main ink tank by
reversing the above procedure.
7 Perform "Ink refill" and make sure that there is no ink leak.
Fixing screw
4-5