40
Thermo Fisher Scientific
Operation Manual HM550
For the fast forward and backward travel between knife and specimen,
the cryostat microtome has a motorized coarse feed system.
e approach between specimen and knife can also be carried out by
means of an automatic function (see page 43).
• Press button (fig. 21.4). Pressing the button briefly leads to short
return travels only.
• Press the button (fig. 21.4) for more than approx. 2 seconds, the
function is carried out continuously. e specimen clamping will
entirely be moved backwards.
Note:
e rear end position is defined as that position which has the longest dis-
tance to the knife.
• To stop this function, briefly press button (fig. 21.4) once more.
• When the rear end position of the specimen clamping is reached,
the coarse feed turns off.
• e LED in button (fig. 21.4) blinks, which means that the speci-
men clamping is in its rear end position.
• Press button (fig. 21.5). Briefly press this button, to carry out a
forward travel of that trimming section thickness which was chosen
via the control panel and shown on the display.
• e continuous forward travel is only carried out as long as the
button (fig. 21.3) is being pressed.
W
arning
With the function coarse feed forwards specimen and knife are adjusted
very quickly. To avoid damage to specimen and knife, the following
points are of utmost importanceꢞ
• Take note that the specimen and knife edge do not come in contact
with each other.
• Carefully observe the narrowing gap between specimen and knife
edge to stop the function coarse feed forwards in time before the
specimen touches the knife.
Feed
Specimen coarse feed
ꢀeturn travel of the
specimen clamping
Feed travel of the
specimen clamping
Operating instructions
Feed
