6 General Maintenance
194 5977B Series MSD Operating Manual
To Replace the Electron Multiplier Horn
The replacement EM horn part number for this Series 2 detector is stamped
on the front face of the detector. You can determine which series detector you
have without having to directly check the detector. The detector series is
displayed as “Triple Axis Series 2” in the detector tab of manual tune, in the
detector section on the second page of the tune report and in the pumpdown
window.
Materials needed
• Electron multiplier horn (Series 2 Detector G7002-80103)
• Gloves, clean, lint-free
• Large (8650-0030)
• Small (8650-0029)
• Pliers, long-nose (8710-1094)
Procedure
1 Vent the MS. (See“To Vent the MSD” on page 113.)
2 Open the analyzer chamber. (See “To Open the Analyzer Chamber” on
page 152.)
3 Open the retaining clip. (See Figure 63 on page 195.) Lift the arm of the clip
up and swing the clip away from the electron multiplier horn.
4 Slide the blue signal wire from the connector in the sideplate.
5 Remove the electron multiplier horn.
6 Hold the new horn with blue signal wire end down, and attach the signal
wire to the connector in the sideplate.
The analyzer, GC/MS interface, and other components in the analyzer chamber
operate at very high temperatures. Do not touch any part until you are sure it is cool.
Always wear clean gloves to prevent contamination when working in the analyzer
chamber.
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