HEIDENHAIN iTNC 530 (340 49x-04) ISO programming - Manual (Page 680)

680 14 Tables and Overviews
14.4 Ex
c
h
anging the Buf
fer Bat
tery
14.4 Exchanging the Buffer Battery
A buffer battery supplies the TNC with current to prevent the data in
RAM memory from being lost when the TNC is switched off.
If the TNC displays the error message Exchange buffer battery, then
you must replace the batteries:
Battery type:One lithium battery, type CR 2450N (Renata)
ID 315 878-01
1 The backup battery is at the back of the MC 422 B
2 Exchange the battery. The socket accepts a new battery only in the
correct orientation.
To exchange the buffer battery, first switch off the TNC!
The buffer battery must be exchanged only by trained
service personnel.