170
4 Maintaining the MSD
To replace the electron multiplier horn
To replace the electron multiplier horn
Materials needed:
Electron multiplier horn (05971-80103)
Gloves, clean, lint-free
large (8650-0030)
small (8650-0029)
1 Vent the MSD (page 52).
2 Open the vacuum manifold (page 54).
3 Open the retaining clip.
Pinch the two arms of the clip together and swing the clip down.
4 Remove the electron multiplier horn.
5 Install the new electron multiplier horn.
6 Close the retaining clip.
The signal pin on the horn should rest on the outside of the loop in the contact
strip. Do not put the signal pin on the inside of the loop in the contact strip. Incor-
rect installation will result in poor sensitivity or no signal
7 Close the vacuum manifold (page 56).
8 Pump down the MSD (page 58).
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