Z70 Absolute Position Error on M720 unit

[luthau]

The NC alarm reads:
Z70 Abs Posn Error (Servo Alm 25) 0101 XYZ
together with
S04 Pw Sply: Instant Pwr Interrupt 0071 S1

the S04 0071 alarm can be reset by pressing the RESET button.
For the Z70 0101 alarm, it need Zero Point Initialization to be performed.
How do I do this? I tried to follow the steps given in

http://www.machinetoolhelp.com/Procedures/Mitszeroreturnset.html

but couldn't proceed to steps #3. It might because of different NC model.

What I have is a M720 interface;
Mitsubishi CNC 720VSM
FCU7-MU531 unit
FCA720P-4VS model

 

[luthau]

Already found it in the M700 70 Maintenance Manual. I follow the steps on chapter 18. Absolute Position Detection 18.3 Setting Absolute Zero Position. I'm stuck at steps 2.d. Whenever I input in it says error. I notice that the state are "illegality". How do I proceed?