Ion source chamber doesn't want to open after venting the MS

Hi All,

I have a huge problem with ion source chamber opening. I need to clean the ion source and after venting the GC MS and unfastening the side plate thumbscrews the side plate doesn't move (as if there still was a vacuum).
It never happened before (the source was cleaned regularly, most recently under the supervision of a service technician).
What can I do to open it without the need for a servicing call?

Thank you for you help

Regards Anna

Was this helpful?