Hitachi IJ PH Service Manual page 92

4.1.3 Approach to the parts on the rear side of the equipment
1 Perform the operations of 1 to 3 in "4.1.2 Approach to the parts on the
front side of the equipment".
2 Remove the fixing screws (2 pieces) of the unit door and open the unit
door.
"Caution" Take care not to cause the plumbing tube to be caught.
Fixing screw
4-3
Unit door