XJ128 and XJ128 Plus Printhead
XJ128 Guide to Operation
Xaar Document no: D031010302 Version A
Page 35
6.3 Electrical system design
6.3.1 Power supply and grounding connections
The grounding signals GND, GNDH, GNDL and supply voltages VDD, VPPH and VPPL should be
common on the drive electronics and not connected to the chassis earth ground.
The power and grounding supplied between the printhead and driver electronics should be arranged
as shown in figure 6.6.
Figure 6.6
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Power supply and grounding arrangement
The negative side of the logic and high voltage supplies should be isolated within the
driver electronics, note that they are joined within the printhead and must not be
joined at any other point.
The printhead cable does not need to be screened.
The printhead(s) and driver electronics should be enclosed.
The enclosure should be grounded to the printer system ground.
No electrical connection should be made to the chassis of the printhead.
Electrical inputs into the printhead enclosure from the power source and/or PC are
suggested through a bulkhead electrical connector.
Voltage supplies VDD, VPPH and VPPL should be isolated.