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General Troubleshooting 2

5977B Series MSD Troubleshooting and Maintenance Manual 41

• Very dirty ion source

• Calibration valve is not working correctly

• Bad signal cable connection

• Filament has failed, or is not connected correctly

• Bad ion source wiring connection

• Bad detector wiring connection

• Failed electron multiplier horn

Peaks are tailing

• Active sites in the sample path

• Injection is too large

• Incorrect GC inlet temperature

• Insufficient column flow

• GC/MSD interface temperature is too low

• Ion source temperature is too low

Peaks are fronting

• Column film thickness mismatched with analyte concentration

(column overload)

• Initial oven temperature is too low

• Active sites in the sample path

• Injection is too large

• GC inlet pressure too high

• Insufficient column flow

Peaks have flat tops

• Insufficient solvent delay

• Incorrect scale on the display

• Injection is too large

• Electron multiplier voltage is too high

• Gain is too high

Agilent Technologies 5977B Series Troubleshooting And Maintenance Guide

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