Need Help!! Heidenhain iTNC 530

[sarabanda]

I can not understand what's going on with the counter. The machine worked, worked, then the following error appears:

7815 The machine is not initialized.
Then there is a problem with the Z axis, the Z axis can not be referenced. Our actions: try to change the hard disk with another earlier saved working copy. This does not help, the Z axis still can not be referenced.
Then we try to throw off the signal cable of the Z axis encoder, turn on the machine without the encoder. Then turn off the machine, reconnect the Z axis encoder and turn on the machine. After these manipulations, the Z axis begins to be referenced.

What's happening? The problem with the encoder or maybe it's in some kind of battery. The MC 422C has a buffer battery, maybe it's in it?

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[csg67]

Heidenhain encoder does not contain batteries.
Buffer battery info: enter the code number 79513

[steryd]

530 has a buffer battery. it's in main computer, looks like a BIOS battery. We had to replace it last year.

[csg67]

RENATA CR2450N or CR2477N