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2
General Troubleshooting
Mass Spectra General Symptoms
This section describes symptoms you might observe in mass spectra. Some of
these symptoms will appear in the mass spectra of samples. Others you will
observe only in a tune report. Some of these symptoms have causes that can be
corrected by the operator. Others, however, require service by an Agilent
Technologies service representative.
Two of the chromatographic symptoms, also apply to mass spectral. (See
sensitivity"
No peaks
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Isotopes are missing or isotope ratios are
incorrect
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34
on page 32 and
Ion source cables not connected
Bad connections to or from the detector
Detector power supply output cable has failed
Collision cell voltages
Collision cell gas flow
Other electronics failure
Incorrect tune file (inappropriate parameters)
Wrong precursor or wrong product ion was selected
MCP or PMT voltage is too low
Repeller voltage is too high
Wrong ions are chosen
High background
Dirty ion source
Collision cell voltage
Collision cell gas flow
7250 Accurate-Mass Q-TOF Troubleshooting and Maintenance Manual
"Poor repeatability"
on page 33.)
"Poor
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Table of Contents
Troubleshooting
