HEIDENHAIN TNC 640 (34059x-01) ISO programming - Manual (Page 475)

HEIDENHAIN TNC 640 475
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7.4 Ex
c
h
anging the Buf
fer Bat
tery
17.4 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 battery:
Battery type: 1 lithium battery, type CR 2450N (Renata) ID 315 878-01
1 The buffer battery is on the main board of the MC
2 Remove the screws of the MC housing cover
3 Remove the cover
4 The buffer battery is at the border of the PCB
5 Exchange the battery. The socket accepts a new battery only in the
correct polarity
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Caution: Danger of life!
To exchange the buffer battery, first switch off the TNC!
The buffer battery must be exchanged only by trained
service personnel.
When exchanging the buffer battery, ensure electrostatic
discharge protection. Improper handling can result in
damage to the components or assemblies due to ESD!
Make a data backup before changing the buffer battery!