11-12 Troubleshooting
No Beam or Emitter current (in FI source):
Possible cause Corrective action
Probe is incorrectly position. Determine whether the position of
the emitter is correct. Using the
emitter probe, adjust the knob.
See also: Inserting the FI/FD inner
source probe on page 9-11.
No extraction voltage or current
leakage occurring.
Ensure the extraction voltage read-
back is present and the leakage
current is less than 10 mA.
See also: Obtaining a beam and
tuning in FI operation on page 9-21.
Emitter is damaged. Ensure that the emitter is not
damaged by visually inspecting the
emitter wire. Check the emitter
current readbacks match the set
values. Replace the emitter if
required or check continually with a
multimeter.
See also: Changing an emitter on
page 10-33.
Excessive leakage current (in FI source):
Possible cause Corrective action
Internal source wiring is touching
grounded elements.
Inspect the source and move the
wires.
Continued high leakage current. Inspect the source. Strip and clean
the source if required.
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