HP Scitex FB7500 Advanced Printer Guide Rev. B - Page 23

board. Each print head in addition to the ink supply includes an

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The bridge contains the 312 print heads, 52 per color. All print heads are mounted on the ink bar and arranged in arrays. Each array contains 8 print heads which are connected to their PIC board. Each print head (in addition to the ink supply) includes an electronic package and a 26-pin male connector, as shown on Figure 2-16 on page 22. A set of registration pins ensures accurate positioning of print head modules with respect to each other and to the plate on which they are mounted. PIC board Print head Ink bar Figure 2-7 Eight Print Heads Connected to the PIC Board For the maintenance procedures, the printing bridge should be lifted using the two lifting pistons. Caution To avoid curing of the ink while the bridge is in vertical position (during maintenance), the following guidelines are recommended: • Do not position a light source directly above the printing bridge. If there is one directly above the printer, it should be turned off while the bridge is in vertical position for more than a few seconds. • The power density of a light source above the bridge should not exceed 3mW/cm2. • Sunlight is a real risk in case there is an open window that allows direct sunlight into the room and towards the exposed bridge. Make sure that such windows are shut. In general, if the bridge is left in vertical position for more than a few moments - it should be covered. 14 HP Scitex FB7500 Advanced Printer Guide

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14
HP Scitex FB7500 Advanced Printer Guide
The bridge contains the 312 print heads, 52 per color. All print
heads are mounted on the ink bar and arranged in arrays. Each
array contains 8 print heads which are connected to their PIC
board. Each print head (in addition to the ink supply) includes an
electronic package and a 26-pin male connector, as shown on
Figure 2-16
on page 22. A set of registration pins ensures accurate
positioning of print head modules with respect to each other and to
the plate on which they are mounted.
Figure 2-7
Eight Print Heads Connected to the PIC Board
For the maintenance procedures, the printing bridge should be
lifted using the two lifting pistons.
Caution
To avoid curing of the ink while the bridge is in vertical position (during
maintenance), the following guidelines are recommended:
•
Do not position a light source directly above the printing bridge. If there
is one directly above the printer, it should be turned off while the bridge
is in vertical position for more than a few seconds.
•
The power density of a light source above the bridge should not exceed
3mW/cm
2
.
•
Sunlight is a real risk in case there is an open window that allows direct
sunlight into the room and towards the exposed bridge. Make sure that
such windows are shut.
In general, if the bridge is left in vertical position for more than a few
moments - it should be covered.
PIC board
Print head
Ink bar