Error Message:

CARRIAGE: could not find edge of plate check that plate size is entered correctly

Applies to:

• All

Service Information:

The exposure head has completed its search without finding the edge of the plate. The head believes that it correctly started on the reflective strip, but after searching for three successively larger areas, no plate edge was detected. The plate will be unloaded without imaging.

First measure the plate size and ensure that it matches the plate size specified on the workstation (or in the bay by typing "set state bay <bay #>"). If the plate sizes are different by more than a couple of millimeters (or 1/8"), correct the discrepancy and try the edge search again.

Next ensure that the edge search parameters are all at default settings: "set carriage esearch" "set carriage eatt" "set carriage espot" (Green heads only) "set carriage wsearch"

For GREEN heads:

In the diagnostic monitor, type "plot edge cal" and the green edge finding spot should be positioned very close to the edge of the plate (note that the drum's reflective strip is NOT held in position under the spot). A strong laser spot should be visible, if not there is a problem with the head, i.e. the shutter is not opening, the laser is failing, etc. If the laser spot is not within 2 millimeters of the plate edge, the "carriage cph" parameter must be adjusted by the distance between them. It should be increased if the spot is too far off the plate, decreased if it is on the plate. Check the new setting of cph by typing "plot edge cal" again and then save it.

Once satisfied with the cph value, move the drum's reflective strip into position with "drum edge". The green spot should be in the middle of the lower half of the strip. If not, the "drum epos" parameter should be adjusted by 10 counts down if the spot is too low, and 10 counts up if the spot is too high. Check the new setting of epos by typing "drum edge" again and then save it.

If the edge search is still unsuccessful, the exposure head may be faulty.

For THERMAL heads:

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Operator Action:

Double check that the actual plate size matches the plate size stored on the workstation. For Platesetters, this information is retrieved by clicking on a cassette bay button. If they match, record error message and contact Creo service.

Cause:

• Actual plate size different than plate size specified in bay or on workstation
• Edge search distance parameters too small
• Plate not loaded correctly on drum. For Trendsetter autoloader, if the plate size is smaller than 559mm, make sure the plate is loaded onto the rightmost and middle pin.
• "set carriage cph" parameter needs adjusting
• Exposure head faulty

See Also: