Clock time wandering 1

[Eaglebird]

The time on the MD110 keeps wandering by up to 15 mins every few days.
The time has been corrected (using CATII command) and a clock calibration set up. The clock calibration is ended after 3 days, and the time remains correct for a few days, then starts to wander again.
Any ideas please?
Tried restarting prog unit PRH to no avail.
Thanks.

 

[Yorkie9]

Thanks for that parnum, I'll let you know how you all know how i get on.

 

[Yorkie9]

I've run the calibration for about three weeks, hope this cures some of our support calls about time slippage.

Thanks for all the help chaps.