Leica Biosystems CM1520 - Manual (Page 51)

51 Leica CM1520 – Cryostat
If errors occur, they are output as error codes in the real-time display during normal operation
with the format EO:XX.
8. Troubleshooting
8.1 Error messages in the display
Error messages are displayed on the clock panel as follows EO: XX . The
following error messages might occur during operation:
Fig. 50
• In normal operation, the error displayed can be acknowledged by pressing any key once. Error
codes 21-28 are self-acknowledging if their cause has been eliminated.
• After 15,960 hours, "HELP" is output in the real-time display to indicate the need for service mainte-
nance. The display alternates between "HELP" and the real-time display. The note is acknowledged
by pressing a key on the keyboard. The "HELP" display reappears for a longer period.
• After 17,610 hours, "HELP" is output in the real-time display to indicate the need for service mainte-
nance. The display alternates between "HELP" and the real-time display. The note is acknowledged
by pressing a key on the keyboard. The "HELP" display reappears for a shorter period.
Error Cause Remedy
20 Calibration error; possibly defective controller board.
Switch the instrument on again.
If the error is displayed again:
Call service.
21 Clock battery on the controller board empty. Call service.
23 Cryochamber temperature out of display range of
35 °C to -55 °C.
Eliminate cause.
25 Temperature sensor for cryochamber temperature defective. Call service.
27 Temperature sensor for defrost limiter defective. Call service.
28 Both light barriers in the handwheel active. Call service.
29 Service interval warning after 15960 hours. Call service.
30 Service interval expired after 17610 hours. Call service.