User`s guide

Chapter 8 Maintenance and Troubleshooting
8-20 PerSeptive Biosystems
8
Calibration (mass) shifted
up or down by 10 Da
Uneven matrix layer
causing hot and cold
spots
Acquire a number of
spectra and accumulate
scans.
Prepare new sample spot.
Resolution labels or
signal-to-noise not
displayed
Peaks not detected Apply peak detection
when acquisition is
complete by clicking
in the toolbar.
Table 8-2 Instrument Control Panel Troubleshooting (Continued)
Symptom Possible Cause Action
Table 8-3 PSD Troubleshooting
Symptom Possible Cause Action
Cannot see low mass ions
in PSD mode
Guide Wire Voltage% too
high
Adjust. See
Section 5.4.3.3,
Optimizing Guide Wire
Voltage%.
Peak selected with
Precursor Ion Selector not
appearing, or not
appearing at expected
mass (single-stage mirror
only)
Timed ion selector not
working, due to invalid
flight length value
Call PerSeptive
Biosystems Technical
Support.