Print Head-Related Maintenance - Hitachi IJ PH Service Manual

5.

Print head-related maintenance

5.1 Outline structure of print head and how to remove each cover
1. Outline structure of print head
(1) The outline structure of the print head is shown in the following figure. Two kinds of
bases (head base and gutter base) are joined to the head cable by screws. The sealing
valve, the heating unit and the deflecting base are disposed on the head base. The
gutter and the APH shield are disposed on the gutter base. Furthermore, the nozzle
and the deflecting electrode are disposed on this deflecting base.
(2) The rear surface of each base is a terminal area of electrical components. Packings
are put in the mating portion of the head base and the head base rear cover. Further,
packings are put also in the mating portion of the head base and the deflecting base.
(3) The APH sensor board (EZJ98 board assembly) for the phase matching is put in the
recovery path on the head base rear surface.
Sealing valve (MV9)
Head cable
Heater cover
Head base rear cover
2. How to remove each cover
(1) When the knurled screws are unloosened, the head cover can be removed.
(2) When the setscrews are unloosened, the heater cover can be removed.
( 3) When the setscrews are unloosened, the head base rear cover can be removed.
Be careful so as not to damage the head base, the packing and the like.
Nozzle
Head base
Four head rear cover fixing screw
Heating unit
APH sensor board
Eight head rear cover fixing screw
5-1
Deflecting electrode+
Charged electrode
Knurled screw
Deflecting base
APH shield
Deflecting
electrode-
Gutter base
Head cover
Gutter
Packing