5 General Maintenance
5975/5977 Series MSD Operating Manual 121
To Remove the EI HES
Materials needed
• Gloves, clean, lint-free (Large 8650-0030) (Small 8650-0029)
• Tweezers (8710-2460)
Procedure
1 Vent the MS. (See “Vent the MSD” on page 104.)
2 Open the analyzer chamber. (See “To Open the Analyzer Chamber” on
page 119.)
3 Remove the two large thumbscrews that hold the ion source in place. (See
Figure 35 on page 122.)
4 Disconnect the wires from the EI HES. (See Figure 35 on page 122.) Do not
bend the wires any more than necessary. (See “To Connect/Disconnect
Wiring to the EI HES” on page 123.)
5 Using the source finger grip, pull the ion source out of the source radiator.
The source contacts have spring loaded pins so some force must be applied
to pull the source out.
The analyzers, 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.
Make sure you use an antistatic wrist strap and take other antistatic
precautions before touching analyzer components.
When disconnecting leads, pull on the connectors, not on the wires.
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