Replacing A Fuse - Thermo Scientific TSQ Quantum GC User Manual

Issue: Weak signal.

Replacing a Fuse

Replacing PCBs and Power Supplies
Thermo Scientific
• 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.
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 "Tuning and Calibrating"
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
Ionization Modes" on
• 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
page 135 for more information.
• The electron multiplier is faulty. Contact Thermo Fisher Scientific Technical Support.
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.
on page
page 73.
TSQ Quantum XLS and TSQ Quantum GC User Guide
7
Diagnostics and Troubleshooting
on page 85.
63. An electron multiplier older than
"Filament and Lens Control Issues"
Replacing a Fuse
"Changing
on
145