56 5977B Series MSD Troubleshooting and Maintenance Manual
2 General Troubleshooting
Lens supply fault
• Electrical short in the analyzer
• MSD electronics are not working correctly
Log amplifier ADC error
• MSD electronics are not working correctly
Data Acquisition communication error
The gas chromatographs and mass spectrometers supported by Data
Acquisition GC/MS Acquisition Software require IPv4 Internet Protocol (IP)
addresses. IPv6 IP addresses are not supported. Therefore, any data system
computer (PC), router, switch, or hub that handles data packets to and from
the instruments must use the IPv4 IP protocol and IPv4 IP addresses for the
network interface used for the connections to the gas chromatographs and
mass spectrometers. If required for other applications, the PC may also have
the Ipv6 Protocol configured as an optional configuration for the same
network interface card, or a second network interface card.
• LAN cable disconnected
• Incorrect IP configuration
• Incorrect IP address entered for the GC or MSD
No peaks found
• Emission current was set to 0
• Electron multiplier voltage is too low
• Amu gain or offset is too high
• Poor mass axis calibration
• Calibration vial(s) empty or almost empty
• Excessive pressure in the analyzer chamber
• Air leak
• Signal cable is not connected
• Electrical leads to the detector are not connected correctly
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