Leica CM1950 manual Coarse feed functions, Motion continues as long as the button is held

7. Instrument Controls

Coarse feed functions

The two-speed electric coarse feed is designed to quickly position the spec- imen in relation to the knife. The buttons with double arrows move the spec- imen at 900 μm/s; the buttons with single arrows move it at 300 μm/s.

Retracting the specimen head from the knife

•Pressing once starts the rapid backwards movement to the rear end

1 position (Home position).

The LED (1) flashes while the specimen head is in motion.

fast	The LED (1) lights up when the rear end position (Hp.) has been reached.
	• The retraction can be stopped by pressing one of the coarse drive buttons.
	• The rapid backwards movement to the rear end position (Hp.) starts.
	The motion continues as long as the button is held.
	• A brief press of the button retracts the specimen by 20μm.
slow

Advancing the specimen toward the knife

	•	Start the slow forwards movement to the knife.
		To feed the specimen, press and hold the button.
slow	•	Pressing the button briefly results in a feed motion of 20μm.

• Start the fast forwards movement to the knife.

2• The LED (2) flashes while the specimen head is in motion.

The LED (2) lights up when the forward end position has been reached.

fast

Manual sectioning mode

Select ROCK operating mode (LED active) – retraction must be enabled!

•For sectioning, turn the handwheel a short distance (approx. 1/4 turn) forwards and back (rocking mode) – only possible at rear (handwheel in approx. 12 - 3 o'clock position).

Every change in rotation direction is electronically detected and automati- cally translated into a specimen feed or retraction movement.

Leica CM1950 – Cryostat 33