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Thermo Fisher Scientific
Malfunction
Possible Cause
Excessive Noise
Defective or low sensitivity
PMT
Defective input board
Defective cooler
Non-linear response
Incorrect calibration source
Leak in sample probe line
Excessive response
Partially blocked sample
time
capillary
Hang up/blockage in sample
filter
Improper converter
Questionable calibration gas
operation
Converter temperature too high
or too low
Low line voltage
Molybdenum consumed
Troubleshooting
Troubleshooting Guides
Action
Unplug power cord. Remove
PMT. Install known good PMT.
Plug in power cord. Check
performance.
Replace board.
Check temperature (less than -
2 °C at T
= 25 °C).
amb
Verify accuracy of multipoint
calibration source gas.
Check for variable dilution.
Unplug power cord. Clean or
replace capillary.
Change element.
Verify accuracy.
Temperature should be
approximately 325 °C.
Check to see if line voltage is
within specifications.
Replace Molybdenum converter
cartridge.
Model 42i Trace Level Instruction Manual
6-3
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Troubleshooting
