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Print Quality
6-13
HP DesignJet 430, 450C and 455CA Printers
Cartridge Fault
D A nozzle is blocked or faulty and is not firing inkĆdrops.
D The ink drops of one nozzle are of smaller volume than those of the other
nozzles.
D A nozzle's ink drop volume varies while plotting.
D A nozzle's ink drops are misdirected:
D Defect in manufacture of cartridge.
D Dirt or debris on the nozzle plate.
D Ink puddling on the nozzle plate.
D An electrical contact is misaligned or damaged on the cartridge, so that it
doesn't make correct contact with the circuit on the carriage. (See ' page
4Ć12, w Carriage Test.)
Printer Fault
D Incorrect swathĆadvance angle of the drive roller. This could be caused by a:
D Faulty roller (irregular roller radius / defective bearings)
D MediaĆaxis inaccuracy (defective media motor or driver circuit /
calibration lost)
D An electrical contact is faulty in one of the Printer cartridge chutes, so
that it doesn't make correct contact with the circuit on the cartridge. (See
' page 4Ć12, w Carriage Test.)
D Nozzles touch the service station, thus causing puddling to occur on the
printĆhead.
D Some of the small slots on the encoder strip are damaged. Therefore the
Printer cannot position the carriage correctly during cartridge servicing.
D Cartridges are misaligned with respect to each other.
D Calibration values lost or incorrect.
Media Fault
Some types of media have a coating that prevents them getting wet" from
the ink drop. The ink doesn't spread out sufficiently around the point where
the dot is placed.
Banding may not occur on some poorĆquality media, where it is counteracted
by another problem: large dot gain. This is where the ink spreads out
excessively on the media around the desired dot position. To accurately test
for banding, use HP polyester inkjet film.