7
Diagnostics and Troubleshooting
Replacing a Fuse
Thermo Scientific
TSQ Quantum XLS and TSQ Quantum GC User Guide
145
• Reagent gas is leaking into the analyzer, suppressing EI signal. Check for the presence of
CI Reagent ions in spectrum. Replace the CI Reagent Gas Flow Module if necessary.
Issue:
Weak signal.
Possible causes/solutions
• The ion volume or ion source lenses are dirty. Clean the contaminated components as
described in
“Cleaning Ion Source Components”
• The multiplier is set too low. Run multiplier gain calibration in Auto Tune - Calibration
as described in
. An electron multiplier older than
2–3 years may be too noisy for the multiplier gain calibration to accurately set the voltage.
The electron multiplier might need to be replaced. Contact Thermo Fisher Scientific
Technical Support.
• The wrong type of ion volume is installed. EI and CI require different ion volumes. They
may not be used interchangeably. Change the ion volume as described in
.
• The ion volume is absent or incorrectly positioned. Verify that the ion volume is
positioned correctly.
• There is a filament or lens control problem. See
“Filament and Lens Control Issues”
for more information.
• The electron multiplier is faulty. Contact Thermo Fisher Scientific Technical Support.
Replacing a Fuse
Replacing PCBs and Power Supplies
CAUTION
Fuses protect the various circuits by opening the circuits whenever overcurrent
occurs. On the TSQ Quantum XLS and TSQ Quantum GC mass spectrometers, a failed
fuse indicates a failed board or electronic module that must be replaced by a Thermo
Fisher Scientific Field Service Engineer.
CAUTION
The TSQ Quantum XLS and TSQ Quantum GC mass spectrometer
electronic assemblies are close-packed to minimize the size of the system. Due to the
complexity of removing and reinstalling the mass spectrometer electronic assemblies, only
a Thermo Fisher Scientific Field Service Engineer can replace electronic assemblies.
