Oce Arizona T220, Руководство пользователя

Страница: 58 / 79

Océ | Operating the Arizona T220
5-48 3010100686-A
5.5
Maintaining Print Quality
This section includes descriptions of some print quality problems and possible solutions.
It discusses the Diagnostic Stripe, which is a very useful tool for evaluating print
problems — See “Evaluating the Diagnostic Stripe” on page 50. Also, flushing the heads
is often an effective solution to print quality problems — See “Flushing the Heads” on
page 54.
5.5.1
Gradual Degradation in Print Quality
After extended use, print quality may start to suffer – especially after continuously
running at high heat settings. If this happens we recommend that you flush the print
heads with solvent and leave them to soak for at least one hour, but preferably overnight.
Refer to Flushing the Heads for this procedure.
5.5.2
Start of Day (Post-Maintenance)
Head not firing — check that the foam capping pads are positioned correctly. Replace
the pad that is under the affected head and soak the new one with solvent. Syringe and
soak the head for at least 5 minutes, ensuring that all nozzles are clear by observing the
curtain of solvent exiting the head.
Poor print quality, multiple nozzle drop out — move carriage to access position,
initiate Operator/Maintenance/Pump Solvent command and verify that solvent flows
along all the channels in the capping tray to suitably soak all of the foam pads. If there
is air in the solvent lines, pump more solvent until it reaches all of the foam pads. Initiate
a recovery purge and, if necessary, syringe the affected print heads and check the curtain
of solvent exiting the heads.
5.5.3
Printing with High Heat
When printing with high heat levels, the ink is more susceptible to drying on the nozzle
plate and causing nozzle dropout and overspray. Swabbing the printheads more
frequently will help prevent this.
If large areas of a print do not require any ink from one or more of the colors then those
nozzles may start to dry out. The 2
nd
Prefire Stripe should be used to help keep those
heads running — See “The Pre-Fire Stripe” on page 17.
5.5.4
Ineffective Drying at Start of Image
If the drying at the start of the image (first 6”/15cm) appears to be less effective than the
drying for the rest of the image then the following should be considered:
• If the printer has been idle for more than an hour then a long purge should
be performed to ensure any solvent that has migrated into the heads has
been expelled.
• If the image is too narrow then drying time will be affected. Offset the
image from the side of the table or widen the image.