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7 Troubleshooting | 7.2 Column
ZEISS
NOTICE
Contamination by dust particles or fingerprints
Dust particles or skin grease can cause contaminations, which lead to flashovers or to bad vac-
uum.
4
Wear lint-free gloves throughout the whole procedure of replacing the filament.
Parts and Tools
Lint-free gloves
Stereo light microscope or a magnifying glass
Prerequisite
ü
The filament holder is inserted into the firing unit.
Procedure
1. Insert the brass retaining washer.
2. Use the adjust key to gradually tighten the
brass retaining washer until the filament is flush
with the top of the firing unit.
3. Use a stereo light microscope or hand lens to
check that the filament is centered and is flush
with the top of the firing unit.
4. If the filament is not centered, then turn the grub screws to center the filament.
INFO:
The grub screws have pointed ends.
5. If the tip of the filament is not flush with the top of the firing unit, then turn the brass re-
taining washer to adjust the tip of filament distance.
6. Once the filament is flush with the top of the firing unit, turn the brass retaining washer in
anticlockwise direction.
Choose the number of turns according to the table above.
9
The filament distance is correctly adjusted.
140
Instruction Manual ZEISS EVO | en-US | Rev. 10 | 354706-0780-006
Summary of Contents for EVO
Page 1: ...Instruction Manual ZEISS EVO Scanning Electron Microscope...
Page 179: ......