3-6 Maintenance Procedures
5. Carefully unscrew the corona pin adjuster nut and remove it, together
with the corona pin assembly, from the APGC ion chamber (see the
figure on page 3-4).
6. Remove the ceramic washer, spring, and insulator from the corona pin
assembly.
7. Replace the corona pin if it is deformed or otherwise damaged.
Tip: If it is undamaged, clean the tip of the pin with the lapping film,
and then wipe it clean with a methanol-saturated lint-free tissue.
8. If you are replacing the corona pin, dispose of the old pin in accordance
with local environmental regulations.
9. Fit the ceramic washer, spring, and insulator to the corona pin (see the
figure on page 3-4).
10. Fit the corona pin assembly in the APGC ion chamber, and fit and
tighten the corona pin adjuster nut.
11. Reposition the corona pin (see the figure on page 2-10).
12. Refit the APGC ion chamber onto the ion block (see the figure on
page 2-11).
13. Connect the APGC corona pin extension cable to the corona pin
mounting socket.
14. Close the source enclosure.
Warning: To avoid spreading contamination, dispose of the
corona pin in accordance with local environmental
regulations.
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