I have cnc machine DMC64V linear.
Cnc control FANUC 180i ( separete CNC, PC, LCD display).

Main parts:
1. CNC unit (one of card HSSB Interface Board )
2. PC unit ( HDD+ PCB mainbord with 2 cards: power supply and HSSB backplane)
3. Panel
4. PMC ( fanuc's PLC)

Notice: CNC is connect with PC unit by HSSB ( fiber optic)

TROUBLESHOOTING:
Not started LCD display ( panel i).

Diagnose:
1. HSSB Interface Board have Alarm ( from LED) comminication error, hssb comunication has been interupted
2. Fiber optic looks good.
3. Mainbord of PC - power LED not light ( failure mainbord or supply card or no signal from hssb?).
4. Backpanel HSSB of PC unit LED 1,2 not light(failure backpanel or no signal from hssb or not power in mainbord?).

Mayby sombody know how It's work.
PC unit mainbord with backpanel HSSB start after signal from CNC ? or should start separately PC and CNC.