Agilent Technologies 5975C TAD VL MSD, Troubleshooting And Maintenance Manual

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General Troubleshooting
2
5975 Series MSD Troubleshooting and Maintenance Manual 37
Poor sensitivity
•
Incorrect tuning
•
Tune file that does not match the type of analysis
•
Repeller voltage is too low
•
Incorrect temperatures (oven, GC/MSD interface, ion source, or mass filter)
•
Incorrect sample concentration
•
Leaking GC inlet*
•
Dirty GC inlet
•
Incorrect split ratio
•
Purge off time in splitless mode is too short
•
Excessive pressure in the MSD
•
Dirty ion source
•
Air leak
•
Poor filament operation
•
Detector (HED electron multiplier) is not working correctly
•
Incorrect mass filter polarity
* This could cause a fault condition in the GC that would prevent the GC
from operating.
Poor repeatability
•
Dirty syringe needle
•
Dirty GC inlet
•
Leaking GC inlet*
•
Injection is too large
•
Loose column connections
•
Variations in pressure, column flow, and temperature
•
Dirty ion source
•
Loose connections in the analyzer
•
Ground loops
* This could cause a fault condition in the GC that would prevent the GC
from operating.