Maintenance and Troubleshooting:
Troubleshooting
8-13
Troubleshooting
TABLE 8-2
POSSIBLE PROBLEMS AND CORRECTIVE ACTIONS
Problem
Possible solution
Not possible to switch the microscope
or the PC on
•
Check the mains switch and the mains unit circuit
breakers placed at the microscope back.
•
Check the mains and the mains circuit breaker.
Server crashes at the Start-Up
•
Restart the PC.
•
If this doesn’t help, restart the whole system.
•
If this doesn’t help, run the
Diagnostics Auto Report
and
Simple TAD
utilities (see below).
No signal / illumination
•
Check the
Status
module /
Emission Current
to be
within the range: 50 - 400 µA (see Chapter 4).
•
Check the Beam Blank not to be on (see Chapter 4).
•
Select the largest Final Lens Aperture (No. 1, diameter
1 mm - see Chapter 2). Click the
Tuning
module /
Crossover
button and check the position of the
crossover image, which should be under the green
cross. (see Chapter 4).
•
Set the
Enhanced Image
/
Digital Brightness
/
Gamma
/
Digital Contrast
values to the default.
•
Set the highest
Detector
module /
Contrast
value (see
Chapter 4).
•
Select the
Scan
menu /
Full frame
(see Chapter 4).
•
Use a different detector (see Chapter 5).
Astigmatism exceeds the UI control
limits (bad image, not possible to focus)
•
Use a different final lens aperture (see Chapter 2).
•
Run the
Final Lens Aperture Strip Alignment
at
30 kV, spot 3 (see Chapter 6) following by the
Tuning
module /
Lens Alignment
(see Chapter 4).
•
Remove the Standard Insert, set the HiVac mode and
check the image quality. If this helps, clean or replace
the Standard Insert apertures (see above).
Image shift when focusing
•
Run the
Final Lens Aperture Strip Alignment
(see
Chapter 6) following by the
Tuning
module /
Lens
Alignment
(see Chapter 4). If this does not help, run
the
1 - Gun Alignment
procedure (see Chapter 6).
Not possible to adjust the
1 - Gun alignment
•
Check there is only one
Gun Tilt
position with
maximum illumination. If there are more of them, place
the Gun Tilt cross among them (see Chapter 6).
•
If illumination is lost during a
Gun Shift
adjustment
(
Modulator
is on), re-adjust the Gun Tilt position
(
Crossover
mode) to find the illumination again (see
Chapter 6).
•
Run the
Diagnostics Auto Report
and
Simple TAD
utilities (see below).
Summary of Contents for Quanta FEG 250
Page 8: ...C vi...
Page 28: ...System Operation Quanta FEG System States 3 10...
Page 108: ...Alignments 1 Gun Alignment 6 6...
Page 114: ...Alignments 154 Water Bottle Venting 6 12 154 Water Bottle Venting...
Page 152: ...System Options Automatic Aperture System 9 4...
Page 154: ...System Options Nav Cam 9 6 401 NAV CAM AUTOBRIGHTNESS...
Page 177: ...System Options Cooling Stage Waterless Cooling Stage 9 29...
