Leica Biosystems CM1950 - Manual (Page 13)

13 Leica CM1950 – Cryostat
2. Safety and Design
To lock the handwheel, press the lever (1) outward. Continue turning
the handwheel slowly until the grip is in the upper or lower position and
the handwheel is locked. Press the lever fully outward; gently rock the
handwheel back and forth until the locking mechanism clicks into place
noticeably.
To release the handwheel, press the lever (2) on the handwheel toward the
cryostat housing.
Centering of the handwheel (motorized instruments only)
Pull out the handwheel's handle and position it in the middle of the hand-
wheel. The handle automatically engages in this position.
12 o'clock
position
6 o'clock
position
1
2
Fig. 7
Knife guard
Prior to making modifications to the knife and specimen, changing the specimen or knife,
or taking a break, always lock the handwheel and cover the cutting edge with the knife
guard!
The CE, CN and CN-Z knife holders feature knife guards; the glass anti-roll plate of the CE knife
holder also serves as a knife guard.
Rotate the handwheel only if the refrigeration system is on and the
cryochamber is cold.
An important safety device on the cryostat is the centering of the
handwheel for motorized instruments.
Always lock the handwheel prior to making modifications to the
knife or specimen, changing the specimen, or taking a break!
2.6 Securing/locking the handwheel
Fig. 9
Fig. 8