Leica M500 N Service Manual page 73

Service manual M500 N, M520, M525
Doc Code 10 665 751
Step Description
Illumination
3.17 Inspect fibre optics cable and its
connectors for damages.
3.18 Plug and unplug fibre optics.
3.19 Switch on light source, dim moderate
intensity.
3.20 Observe field of illumination at
WD=207mm and max. magnification; set
diaphragm to maximum.
3.21 Observe field of illumination at
WD=207mm and min. magnification; set
diaphragm to maximum.
3.22 Check autoIris function (M525 only):
Press autoIris reset button and
increase/decrease zoom.
3.23 Check Iris diaphragm diameter at WD
250, position optics carrier to a sharp
image; set diaphragm to minimum by
rotary button.
Image
3.24 Adjust parfocality, select a WD 320
3.25 Measure diameter of visible field of view
in the object plane
7-7
Required results
Seem to be intact, no dots in fibre.
Fibre optics does snap in noticeable.
Field of view is illuminated.
No reflexes, no disturbing stray light in field
of view, homogeneous illumination in the
field of view.
No reflexes, no disturbing stray light in field
of view, Gaussian distribution of illumination
in the field of view; the light spot is in centre
of field of view.
Light field diameter is automatically
following the size of the visual field, but
always slightly bigger.
(Diameter is around 29mm at WD250 and
maximum zoom)
Diameter of illumination circle measured in
object plane:
11mm +/- 1.5mm
Image is sharp throughout entire zoom
range.
Diameter field of view:
WD at max and zoom at min: >170mm*
WD at min and zoom at max: <18mm*
*with 10x eyepieces and tube focal length 170mm
Inspection
07/2007 Gahe
O.K. Fails