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Replacing the Filaments
To replace burned out filaments, the MS-40 must be vented to permit the
removal of the source from the mass spectrometer (illustrated in Figure 4-3).
The procedure to replace the filaments is:
1. Vent the entire system. Follow the procedure stated in Section 4.6.
2. While holding the source assembly, gently pull off the source
electrical connector.
3. Loosen the four screws that hold the heat sink onto the source
assembly. Remove the four screws and pull the heat sink off the
source assembly.
4. Loosen and remove the remaining two screws holding the source
assembly in place.
5. Remove the source assembly.
6. On the source assembly, remove the two outer nuts that hold the
filament contacts in place.
7. Gently bend the filament contacts away from the source assembly.
8. Remove the two nuts that hold the ceramic spacer in place.
Remove the spacer.
9. Remove the filament assembly.
1109-186-00 Rev. C 4-27
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