
Chapter 8 Maintenance and Troubleshooting
8-14 PerSeptive Biosystems
8
Poor signal-to-noise ratio
or sensitivity
(continued)
Guide Wire Voltage%
too high (lower
masses) or too low
(higher masses)
Adjust. See Section 5.3.4,
Understanding Guide Wire
Voltage%.
Accelerating Voltage
too low
Adjust. See Section 5.4.4.2,
Setting Accelerating Voltage.
Too much salt or
buffer in sample
Clean up sample. See
Section 3.1.5, Sample
Cleanup. Decrease salt or
buffer.
Sample:matrix ratio
not optimal
Try ratios higher and lower
than the recommended 1:10
ratio. May want to prepare a
dilution series (factors of 10).
Accelerating Voltage
malfunction
Call PerSeptive Biosystems
Technical Support.
Beam guide wire
malfunction
Call PerSeptive Biosystems
Technical Support.
Internal detector
power supply setting
too high
Call PerSeptive Biosystems
Technical Support.
Grounded grid in ion
source damaged
Call PerSeptive Biosystems
Technical Support.
Poor signal-to-noise ratio
on sample peaks
Matrix peaks causing
excessive noise in
detector
Turn on Low Mass Gate in
.BIC file to suppress matrix
peaks.
Table 8-1 Spectrum Troubleshooting (Continued)
Symptom Possible Cause Action
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