52 5977B Series MSD Troubleshooting and Maintenance Manual
2 General Troubleshooting
Temperature Symptoms
The MSD has three heated zones:
• Ion source
• Mass filter
• GC/MSD interface
Each heated zone has a heater and temperature sensor. The ion source and
mass filter are powered and controlled by the MSD. The GC/MSD interface is
powered and controlled by the GC. For the 7820A Series GC’s, the heater is
either connected to the rear inlet thermal zone for the single inlet models or
connected to the manual valve thermal zone for dual inlet models.
Ion source will not heat up
• High vacuum pump is off or has not reached normal operating conditions
†
• Incorrect temperature setpoint
• Ion source has not had enough time to reach temperature setpoint
• Ion source heater cartridge is not connected
†
• Ion source temperature sensor is not connected
†
• Ion source heater failed (burned out or shorted to ground)
†
• Ion source temperature sensor failed
†
• Source power cable is not connected to the side board
†
• MSD electronics are not working correctly
† These will cause an error message.
Mass filter (quad) heater will not heat up
• High vacuum pump is off or has not reached normal operating conditions
†
• Incorrect temperature setpoint
• Mass filter has not had enough time to reach temperature setpoint
• Mass filter heater cartridge is not connected
†
• Mass filter temperature sensor is not connected
†
• Mass filter heater failed (burned out or shorted to ground)
†
To Next Page
Loading...
Need help?
General
