Hitachi PXR, Service Manual

Page: 122 / 231

5-1
5 Maintenance of Circulation System
(PXR-P)
5.1 General Structure of Circulation System
5.1.1 The general structure of the circulation system is shown in the following figure.
Using an open/close type door (unit door) as a partition, the system is roughly
divided into an ink circulating area (the front side of the equipment) and a driving
part area (the rear side of the equipment).
Caution:
Since the circulation unit is made of plastic, tightening the screws with excessive
torque will break the unit. See the table below for reference torques:
Reference tightening
torque
Part name (used location)
Companion
parts name
Companion
material
N·m kgf·cm
ICU base A PBT(G30) 1.7±0.3 17.3±3
ICU base B PBT(G30) 1.7±0.3 17.3±3
Self-tapping screw M4X12
(attaching pressure system, etc.)
Front panel PP 1.33±0.22 13.6±2.2
Self-tapping screw M4X16
(attaching solenoid valve)
ICU base B PBT(G30) 1.7±0.3 17.3±3
Self-tapping screw M4X12
(attaching pump cover)
P side plate
ADC12
(aluminum)
1.7±0.3 17.3±3
Self-tapping screw B M3X10
(attaching ICU joint)
ICU base A PBT(G30) 0.5±0.1 5.1±1
Self-tapping screw 3X8
(attaching door lock body)
Door lock
body
POM 0.75 - 1.04 7.6 - 10.6
Self-tapping tow screw 4X12S
(attaching main tank, ink reservoir
and stirrer)
Main
connection
block, etc.
POM 0.8±0.05 8.0±0.5
Makeup ink
reservoir
Ink circulating area
Driving part area
Ink reservoir
Ink filter
Main ink tank
Pump unit
Exhaust duct
Unit door