This message means that the temperature in one of the heated zones is rising more slowly than it should or that the heated zone has failed to reach its setpoint within a fixed time. This can be caused by:
Vent the MSD.
Open the vacuum manifold.
CAUTION! Take precautions against electrostatic discharge (ESD) any time you open the vacuum manifold but especially when working near the mass filter (quad) contacts. These contacts can carry harmful electrostatic discharge to sensitive components on the side board.
Check the heater wires for both the ion source and mass filter heaters. Make sure the heater wires are securely connected to the correct pins on the feedthrough board.
If the heater wires appear to be connected correctly, check the heaters themselves to see if they have failed.
See the MSD maintenance documentation for instructions for venting the MSD and opening the vacuum manifold.
Vent the MSD.
Open the vacuum manifold.
CAUTION! Take precautions against electrostatic discharge (ESD) any time you open the vacuum manifold but especially when working near the mass filter (quad) contacts. These contacts can carry harmful electrostatic discharge to sensitive components on the side board.
Disconnect the heater wires from the feedthrough board. For each heater, use an ohmmeter to check the heater continuity. If the ohmmeter indicates a heater is open circuit (infinite resistance), replace the heater assembly.
See the MSD maintenance documentation for instruction for venting the MSD, opening the vacuum manifold, and replacing the heater assemblies.
If a temperature sensor is not securely attached, it will indicate a temperature lower than the actual temperature of the heated zone. As a result, the temperature control electronics will continue to drive the heater cartridge, overheating the zone. If the sensor is loose enough, the temperature will rise very slowly, or the heated zone will fail to reach its setpoint, and a timeout fault will occur.
Vent the MSD.
Open the vacuum manifold.
Check the ion source temperature sensor. Make sure it is firmly attached.
CAUTION! Take precautions against electrostatic discharge (ESD) any time you open the vacuum manifold but especially when working near the mass filter (quad) contacts. These contacts can carry harmful electrostatic discharge to sensitive components on the side board.
Check the mass filter temperature sensor. Make sure it is firmly attached.
See the MSD maintenance documentation for instructions for venting the MSD and opening the vacuum manifold.