# DSQC 504 short

**URL:** <https://tech-community.robotics.abb.com/t/dsqc-504-short/7147>\
**Category:** Robot Controller\
**Created:** [May 9, 2016, 2:45pm UTC](https://tech-community.robotics.abb.com/t/dsqc-504-short/7147 "2016-05-09T14:45:43Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![BER](https://avatars.discourse-cdn.com/v4/letter/b/ad7895/32.png) [@BER](https://tech-community.robotics.abb.com/u/BER)\
**Post date:** [May 9, 2016, 2:45pm UTC](https://tech-community.robotics.abb.com/t/dsqc-504-short/7147/1 "2016-05-09T14:45:43Z")

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I’ll use this accidental 2nd post to describe another problem, also on the 2400L S4C+.

I have a couple CAN2 Bus errors, which come down to a short on the base board, DSQC 504. I have 1k ohm resistance to ground on the 24v pin for CAN2, and infinite ohm for the CAN1 24v pins.

Is there anything I can do to find/fix the short? The 24v lines are sandwiched inside the board, and I’m not experienced enough to guess where they go.

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**Author:** ![BER](https://avatars.discourse-cdn.com/v4/letter/b/ad7895/32.png) [@BER](https://tech-community.robotics.abb.com/u/BER)\
**Post date:** [May 18, 2016, 3:50pm UTC](https://tech-community.robotics.abb.com/t/dsqc-504-short/7147/2 "2016-05-18T15:50:37Z")

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I’m going to try reinstalling the baseware. The issue occurred when we were transferring files from a PC using FileZilla, which might have overwritten or deleted some system files somehow.

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**Author:** ![BER](https://avatars.discourse-cdn.com/v4/letter/b/ad7895/32.png) [@BER](https://tech-community.robotics.abb.com/u/BER)\
**Post date:** [May 23, 2016, 4:48pm UTC](https://tech-community.robotics.abb.com/t/dsqc-504-short/7147/3 "2016-05-23T16:48:57Z")

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The reinstall solved it. Definitely something happened with FileZilla then.