Dead Fanuc 0M

[triumph406]

Hi I have a Leblond RMC55 with a dead 0M controller, I've checked power supplies, there all good, fuses are good. I've reseated all the boards and connectors. When turnrd on there is nothing I can do on the front panel to get any reaction from the machine. On the main PCB, the only LED that is lit is L2

I've attached an image to show what is on the screen.

Does anybody have any ideas what else I can check?

Thanks in advance for any help, Dave

[cncdiag]

Try powering up holding in the "Reset" and "Delete" pushbuttons.
This will clear the memory.

[triumph406]

Originally Posted by cncdiag Try powering up holding in the "Reset" and "Delete" pushbuttons. This will clear the memory.

I've tried everything, except that, doesn't that clear the parameters too? I thought I had tried that, but it isn't in my notes.

[cncdiag]

Taht will clear everything

[triumph406]

Originally Posted by cncdiag Taht will clear everything

How would that help? Could it be a memory problrm?

[triumph406]

Originally Posted by cncdiag Try powering up holding in the "Reset" and "Delete" pushbuttons. This will clear the memory.

I powered up holding the Reset/delete buttons, no difference.

The screen is still the same, I wonder if the keyboard is seeing the controller?

[cncdiag]

I think you may have a bad control board.
We can test all your boards or you can call 813-983-1870
CNC Diagnostic LLC

[greenery_fr]

I had the same problem and I already repaired. First my machine problem with "reset key" and the second problem is memory PCB .I already changed it and my machine OK

[hrh]

Did you solve the problem yet Dave?

The display on the screen is typical of a watchdog alarm 920 or sometimes an alarm 930 CPU error.
The older master PCB for FS-0 has a WD (watchdog) LED and the newer FS-0 Models C and D have six LEDs.LED1 to LED6 (LED4 is normally for a watchdog error).

The problem may be due to corrupted memory which can be cleared by pressing RESET and DELETE while power is being switched on. Alarms 100, 417, 427, 437 etc should then appear. You should then re-input all data (Parameters, Diagnostics, ATC macro programs etc.)

The cause might also be due defective hardware. You can try to swap the axes control card, master pcb or PSU from another working machine. BTW the axes control PCB also has a watchdog LED which lights up in such an event.
Just remember the older FS-0 master PCB does not have a super capacitor to retain the memory once the battery connector is removed (anything with A16B-1010-0XXX should be swapped with caution).

The memory cards of the newer FS-0 are fitted with super caps (A16B-2201-0101) and can retain memory for up to 72hours in my experience.

It would be a good idea to confirm the operation of the RESER and DELETE keys as well.

[triumph406]

Originally Posted by hrh Did you solve the problem yet Dave? The display on the screen is typical of a watchdog alarm 920 or sometimes an alarm 930 CPU error. The older master PCB for FS-0 has a WD (watchdog) LED and the newer FS-0 Models C and D have six LEDs.LED1 to LED6 (LED4 is normally for a watchdog error). The problem may be due to corrupted memory which can be cleared by pressing RESET and DELETE while power is being switched on. Alarms 100, 417, 427, 437 etc should then appear. You should then re-input all data (Parameters, Diagnostics, ATC macro programs etc.) The cause might also be due defective hardware. You can try to swap the axes control card, master pcb or PSU from another working machine. BTW the axes control PCB also has a watchdog LED which lights up in such an event. Just remember the older FS-0 master PCB does not have a super capacitor to retain the memory once the battery connector is removed (anything with A16B-1010-0XXX should be swapped with caution). The memory cards of the newer FS-0 are fitted with super caps (A16B-2201-0101) and can retain memory for up to 72hours in my experience. It would be a good idea to confirm the operation of the RESER and DELETE keys as well.

hrh,

It's still not fixed, I have boxed the boards ready to send out to get diagnosed. The Main PCB is a newer model A20B-2002-0450, the only LED lit was LED2, which I think justs indicates an error is present. I tried dumping the memory by disconnecting the battery for 15 minutes, I thought that would be enough to dump the memory, I didn't realise there were capacitors on the main board that might retain memory longer. I didn't check whether the RESET and DELETE operate correctly. Might try that tommorrow if I get time.

[hrh]

Dave,

Sorry to hear that you still did not manage to fix the problem.
L2 is generally lit for programming alarms or other resettable conditions.

Please keep us up to date. I am very interested to know what the cause of the problem is. I suspect that either the memory, master or axes control cards may be faulty. I have also found that the Input/Output card causes a problem on the data and address buses with similar effects but this easy to repair.

Good luck.

Hein

[triumph406]

Apologies for the very overdue update.

The parameters were scrambled. I've been using Ni-Cad batteries to keep the memory in the machine. They lost their charge and the parameters were lost. I use Alkalines now, apparently they are good for a year or more before requiring replacing