Error Message:

IMAGE: PLL is not able to track drum motion

Applies to:

• All

Service Information:

The drum position tracking system is not working properly. It is not able to even start tracking the drum.

The drum encoder disk should be cleaned, carefully following the procedure in the Service Manual. The drum belt tension should also be checked. The encoder block may be cleaned using a Can of commpressed air, use only pure clean canned air, to blow off the encoder optics.

If neither of these procedures make a difference, the following can be tried. The order in which they are attemted is arbitrary:

1. swap the MPE
2. re-align the drum encoder. This procedure requires an oscilloscope and training.
3. swap the drum motor and or driver. See Troubleshooting pages on Main Drum Drive Amp problems.

There have been cases where warped or cracked drum encoders have been found. This disk can be inspected with a microscope, and as a last resort, replaced.

Operator Action:

Record error message and contact Creo Service

Cause:

• Dirty drum encoder.
• Improperly adjusted drum belt tension.
• Faulty MPE.
• "Mismatched" drum motor and driver.
• Misaligned or faulty drum encoder.
• Warped or cracked drum encoder disk.

See Also:

• Other: Troubleshooting information