# Troubleshooting MiniSeq fails optical and stage tests "While measuring LED power"/"Failed XY Stage"

Users may find that the MiniSeq fails during optical and stage tests with the error:

* "Error while measuring LED power: While waiting on an asynchronous firmware operation.: camera bitmask 1 Originally caused by: Failed XY Stage"
* "While measuring LED power: Illumina.Spark.EmbeddedCommandSet.ix\_exception\_id\_camera\_failed\_xy: While waiting on an asynchronous firmware operation.: camera bitmask 1 ---> Illumina.Spark.EmbeddedCommandSet.ix\_exception\_id\_camera\_failed\_xy: While waiting on an asynchronous firmware operation. ---> Illumina.Spark.EmbeddedCommandSet.ix\_exception\_id\_camera\_failed\_xy: Failed XY Stage"

If a user encounters this error, contact [Illumina Technical Support](https://www.illumina.com/company/contact-us.html#/united-states/technical-support) for further assistance.

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