Hitachi IJ UX, Service Manual

Page: 143 / 308

4-10
4.3 Pressure Reducing Valve Replacement Procedure
1 Perform “Pressure relief”.
2 Perform the procedures described in “4.1.2 Access to the parts on the front side of the
equipment”.
3 Remove Fastening screw M4x12 (2 positions: upper right and lower left of Pressure
reducing valve) and Pressure reducing valve itself.
And remove the O-ring S-4 (1 piece).
"Caution" : Put wiping paper under Pressure reducing valve to avoid dripping on the
floor, etc.
4 Prepare a new Pressure reducing valve and a new O-ring (1 piece).
[Caution] Make sure to use O-ring S-4 (1 piece).
5 Wet O-ring S-4 with makeup and put it on the joint of the new Pressure reducing valve.
6 Attach the new Pressure reducing valve in reverse order of the procedures above.
[Caution] When attaching the Pressure reducing valve, make sure O-ring S-4 is kept in
place and it does not fall off.
Pay attention to the orientation of the Pressure reducing valve joint.
[“AI” mark shall look Down.]
7 Perform “Ink Replenishment” and adjust the pressure. Make sure that there is no ink leak.
O-ring S-4
O-ring 4.7
6.5 7.7
Pressure reducing valve
Fixing screw M4X12
Pressure reducing valve
O-ring
S-4