Happy new year from Finland!

We bought used Stimin FPH-800 milling machine. There is some problems with C axis and I'd like to temporarily disable it.
On other machine we have, we only need to change parameter 1023(C) to -128.

I have changed these parameters on FPH-800:
0012.7 (C) -> 1
1005.6 (C) -> 1
1005.7 (C) -> 1
1010 -> 3
1023 (C) -> -128

When cables of C axis are detached I get servo alarm on Z axis:
401 SERVO ALARM : Z AXIS VRDY OFF

Can someone help?

Regards,
Niko