Hitachi IJ RX2 Service Manual page 136

5 Remove the fixing screws (2 positions) of the solenoid valve.
"Caution": Put wiping paper under the solenoid valve to provide for an ink
drip.
Fixing screw
6 Clean the portion stained with ink and then install a solenoid valve by
reversing the above procedure.
"Caution" Set the O-ring in the groove of the solenoid valve securely.
Take care not to cause the O-ring to fall off or bite.
O-ring mounting groove
O-ring S16
O-ring 4.7
7 Reset the time of the corresponding solenoid to 0 on the "Parts usage time
management" screen.
Solenoid valve
4-12