LC/MS smoke on power on

Hadn't used LC/MS in more than a year (was powered off).  Replaced rough pump oil, all LC modules turned on fine but upon powering the 6120B MS, smoke came out the back of the unit; just under the fan, looks to be from the enclosed box inside.  Anyone have any clue what could have caused this and how we can go about troubleshootting/repairing this?

Was this helpful?