Chapter 5 - Troubleshooting
5 - Troubleshooting
Troubleshooting Tables
Problem Cause Removal
QS12 temperature
cannot be achieved
Ambient temperature too high
Lower ambient temperature by fresh air, climate.
Please note the specied temperature of +20°C!
QS12 is inuenced by near, heat-
generating instruments
Change site of installation
Draught into the QS12
Change site of installation
Soiled condenser
Open the service door on the left side, clean the
condenser
Defective cooling Call a service technician
Frost built-up on chamber wall
and on microtome
Draught (open doors, windows) Change site of installation; close windows, doors
Retarded freezing-on
of the specimem
Surface of the fast freezing station
is soiled
Remove debris
Lower part of the chuck is soiled
or damaged
Remove debris, remove damage
Static electricity in chamber.
Chatter while cutting
Unfavourable clearance
angle
Readjust clearance angle
Sections tear or crack
Insucient knife sharpness Move the knife in the knife carrier
Knife not adequately clamped Check knife clamping
Chuck inadequately clamped
Specimen inadequately frozen on
onto the chuck
Specimen grossed too thick - -- it
loosens from the chuck
Specimen very hard and uneven
Check clamping
Re-freeze the specimen onto chuck
Again freeze on the specimen
Select new section thickness, reduce the specimen
Sticky sections
Specimen not cold enough Select a lower temperature
Knife and/or anti-roll plate are
not yet cold enough --- section
melts
Allow knie and/or anti-roll plate to cool.
Specimen incorrectly clamped.
Blade clamping force can be increased by tightening.
Wait until the knife and/or the anti-roll plate have
suciently cooled.
Check specimen is securely mounted and clamped
in specimen head jaws. Check there is no debris or
ice on the back of the chuck or on specimen head.
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