7-64 Routine maintenance
To disassemble the contact rail assemblies
For each contact rail assembly remove the following parts:
• Adjusting nut from the support rod.
• Locknut from the support rod.
• Securing nut and washer from the support rod.
• Ceramic spacers and contacts from the central spacer tube.
Cleaning ion burn from the outer source assembly components
To clean the ceramic components
Clean the ceramic components by heating to red heat using a blue (not yellow)
flame. If this does not clean the ceramic components, replace with new
components.
To clean the shields
Using 9-mµ lapping paper, clean the shields.
Tip: The shields are easily damaged; if spares are available, discard the old
shields and fit new shields.
To clean the probe contact assembly contacts
Using 9-mµ lapping paper, clean the probe contact assembly contact faces.
To clean the contact rail contacts
Using a glass-fiber pencil or 9-mµ lapping paper, clean the contact rail contact
faces.
Warning: The outer source assembly components can be contaminated
with toxic materials. Wear nitrile gloves at all times while handling
the components.
Caution: Thin ceramic components are fragile and easily broken when
cleaning by heating.
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