6460 QQQ LC MS

Hi ,

I have  issue with Agilent 6460 that the turbo pump 1 speed is fluctuating between 1% to 38 %

The vacuum of the rough pump is good 1.6 E+o Torr

The green LED at the turbo 1 power supply isn’t turning on .

I measured the input for the power turbo 1 supply and it is 230 volt AC also i measured the output looks 48 volt DC

i checked The Turbo pump 1 visually and it looks spinning

I replaced the power supply for turbo pump 1 and still not getting green light and still having same issue.

Please Advise

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