HELP!! Freeset dct 1800 Ericsson/ascom, CSM R4B

[innominabile]

Hello to all.
I have a problem on Freeset dct1800.
The date on Dect after 2/3 days changes and set year 1959 hour 7.30
I replaced the CPU2, but the problem is back.
The system is a 4 cabinet.

 

[fcpli]

Most probably your CPU card lithium battery is done. But check below address, there is a doc for 1900 (same as 1800 in this case) for more info:

pdfstream.manualsonline.com/4/4de33274-149b-426d-8606-f9977158f98e.pdf

fcpli