Thermo Fisher Scientific
Operation Manual HM335S
64
Possible Sources of
Errors – Cause and
Removal
Problem
Cause
Solution
thick-thin-sections
blunt knife/blade
move knife/blade or insert a new one
knife/blade angle unfavorable clearance angle
adjust knife/blade angle, until an optimal angle
can be found
insufficient clamping on specimen clamping
and/or knife/blade carrier
check all screw and clamping connections on
specimen clamping and knife/blade carrier.
Tighten them, if necessary
compressions
blunt knife/blade
move knife/blade or insert a new one
specimen too warm
cool specimen
unfavorable clearance angle
try clearance angle adjustments until an opti-
mal angle can be found
cutting speed too high
turn hand wheel slower or reduce the speed of
the cutting drive motor
“chatter“ on sections
cutting speed too high
turn hand wheel slower or reduce the speed of
the cutting drive motor
unfavorable clearance angle
try clearance angle adjustments until an opti-
mal angle can be found
insufficient clamping on specimen clamping
and/or knife/blade carrier
check all screw and clamping connections on
specimen clamping and knife/blade carrier.
Tighten them, if necessary
feed is not working, no sections are
produced
front end position has been reached
move specimen backwards with the course
feed motor
coarse feed motor is blocked
contact a service technician
Tight Hand Wheel, partly
debris and section waste between microtome
and base plate
remove section waste and clean microtome
tight hand wheel during the entire
movement
dirty link block
contact a service technician
instrument cannot be turned on
power cord not correctly connected
check power cord
defective main fuse
check/replace the fuses in the
fuse box
cutting drive motor cannot be started
emergency stop button is activated
deactivate the emergency stop button
foot pedal (optional) or interlock connector not
connected
connect foot pedal (optional) or interlock plug
mechanical hand wheel brake activated
deactivate the hand wheel brake by moving the
lever down
“?” displayed for 10 seconds
Failure at linear potentiometer
call service
Note!
In case of equipment failure and/or service work, please turn off the instrument and contact your local dealer.
Working with the Microtome
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