Difference in software packages.

Upgrade the software. See procedure "Software update via Communicator (DC update companion)".

There are other communication errors, including LDM1 communication errors.

Solve LDM1 communication errors first.

There are several LDM 1–x communication errors

• Make sure that all LDM boards are properly seated in the LDM case.

• If problem persists, replace the LDM. See service procedure "The Laser Driver Modules (LDM)".