HEIDENHAIN iTNC 530 Service Manual page 265

Before you replace the buffer battery, the charge status of the Gold cap should be checked:
Checking the
charge status of the
"Gold cap"
When replacing the buffer battery, proceed as follows:
Replacing
the buffer battery
Position of the
buffer battery
July 2010
Enter code number 79513. --> See "Information Menu" on page 17 – 267.
Read the value in the line U [ACCU] --> The voltage must be >= 3 V!
Note
The capacitor (Gold cap) is only being charged when the iTNC is switched on. If the Gold cap
is still not loaded sufficiently, wait a few seconds and enter the code number 79513 again
to read the updated voltage value.
If the voltage of the Gold cap does not reach 3 V or more, the MC must be replaced.
As a precaution back up the condition of non-volatile PLC markers and words from RAM to the
hard disk. --> See "Non-Volatile PLC Markers and Words" on page 11 – 136.
Switch off the machine, take precautions against resetting, ensure that the equipment is free
of potential.
Dismount the MC.
Exchange the battery.
Due to the non-symmetric shape of the battery there is only one possibility of inserting.
Battery type: 1 lithium battery, type CR 2450N (Renata), ID 315878-01
Caution
Be careful not to touch any components sensitive to electrostatic discharge
and observe the ESD regulations!
MC 422 MC 422 B/C
17 – 265