Auto tune fail due to mass 118amu missing


6420 QQQ  auto tune was failed.It was due to 118amu missing.

We were changing ESL L tuning mix,result was the same.We clean ion source & capilary cap,the result was the same.

The calibrant flow & spray was OK.

What will be the probable cause & solution for this problem?

For further information look on attached screen shot.


Yitna Zewdie

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