8-6 Troubleshooting
Poor peak shape
When tuning does not improve poor peak shape, contact Waters. Provide
details of the problem, such as high/low mass tails, symmetric tailing,
asymmetric peak shape, etc. If you observe symmetric tailing, record the
instrument’s vacuum values and the signal heights of the mass 18 and mass
28 peaks.
Contacting Waters
For contact information details, see page i-iv.
When contacting Waters, have the following information available:
• The nature of the symptom.
• The instrument’s serial number.
• Details of the flow rate, carrier gas, column phase/dimension, and
sample concentrations, if applicable.
• The Tune window settings, if applicable.
• The software version update reference, if applicable.
No trap, emission, or filament current readback
Possible cause Corrective action
Damaged source filament or poor
contact to the filament from the
spring contacts on the outer source.
Remove the inner source and test the
continuity of the filament with a digital
voltmeter (the resistance must be
approximately 0.2 ohm). Replace the
filament if it is damaged. If the filament is
intact, use tweezers to adjust the spring
contacts on the outer source to improve
contact.
See “To remove the filament
assembly” on page 7-16 and “To fit
the filament” on page 7-29.
The electrical wires are not
connected to the outer source focus
plate.
Ensure that all the electrical wires
are plugged into the outer source
focus plate.
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