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The FANUC power supply is faulty.

Look at the power supply while someone else is switching the control on and off. The alarm led on the PSU is probably flashing once when the power ON button is...

Most of excess error alarms (410 411) are electro-mechanical in nature.

On a rotary axis, the internal brake mechanism is worn or binding. In some cases the pneumatic valve for releasing the brake...

I suggest change the line M6T#20 to M6T#4120

#4120 is the macro system variable that stores the tool number called up in the main program.

#20 is just a common volatile variable that does not...

FS-0iTB is probably fitted with a Beta drive on I/O link.

Press SYSTEM button once.
Press the => right-hand softkey at the bottom of the screen until one of the softkeys indicate PMM
Press the...

"Reconditioned" PMC pcb or EPROMS.

EPROMS may be checked by repetitive reading of the EPROM data with a commercial EPROM writer and confriming the checksum is the same with every read cycle.
...

Although the FANUC System 0 series is "old", there is a bounty of scrapped machines and spare parts available.
The good thing about FANUC is their commitment to support the product for as long as...

A14B-0076-B001 is the "INPUT UNIT" which controls the ON/OFF sequence and door interlocks.

The red LED on this unit is an indication of the PSU fault or the PSU is going into alarm because of an...

Control PCB of the drive is problematic. Replace it or get it repaired.

Just try the hair-drier if you are desperate...

Logically if the arm is pushing the tool properly into the waiting pot on the magazine but not sufficiently into the spindle, then I conclude that the spindle height is not correct.

Alternatively...

This is not a FANUC program, servo or system alarm.

The alarm is generated by the PLC (pmc) due to an incorrect automatic tool-changer postion of either the arm, magazine, tool-pot etc.

Consult...

The PRS5,6 &7 are position confirmation proximity switches and the ATC arm needs these to confirm tool release from the spindle and Z-axis interlock etc.

The ATC arm is not adjustable via...

It is a bit quirky to use; escpecially the DOSBOX software. Don't use the same mindset as with FANUC PG.

Used the unit on a laptop running WIN7 but at least did not need a separate HDD partition...

The control PCB in the drive A06B-6079-H207 has defective component(s). Get the control PCB repaired or replace it. I fix this type of fault on a weekly basis.

if you are desperate to run the...

There is no problem.

The software for FS-0MD does not incorporate the G31 function. G31 for FANUC Series 0 Model D is limited to grinding machines. (FS-0GCD)

Check if X8.7 is in the ladder of...

The Female DB25 pin connector tends to suffer "wear" from repeated use.

You can make a cable that connects direcly from your PC to CD1. I suggest that you first try to replace the DB25 female...

Try switching to MDI mode and switching program protect key to edit enable

ROM SUM CHECK ALARM

After pressing RESET in AUTO mode:
Select PROGRAM button
Press OPRT softkey underneath the screen
Press REWIND softkey

Check diagnostic 200 when the alarm appears.
The appropriate diagnostic will change 0=>1 indicating the type of detect error.
Most common is OVC and HCA.

For OVC: check motor condition and...

Probability is good that the Y-axis deceleration limit is problematic or the deceleration "dog / cam" is worn excessively.If the limit switch "bounces" the deceleration signal might be triggered...

Power off and unplug the control card from the drive (if it is a A06B-6114-Hxxx) and re-insert.

Check the CXA2A and CXA2B cables for proper insertion.

Also check that the fiber optic cable from...

The functionality is exactly the same. Fanuc might have done some minor "bug fixes" or changed some chip sets to "newer" versions for that time period.

The switch is possibly used for emergency stop and there are two cams / dogs on the sliding part of the Y-axis if the switch is in a fixed position.
The cams / dogs will be on the base or fixed part...

Check DGN 21 bit 4 =1. If =0 then EMG switches for axes or red mushroom e-stop have problems. Sometimes a cable or connector fault on the IO pcb can be problematic or even a missing +24V or a relay...

Ok.

Check parameter 021; should be 00000111 indicating that x,y,z are using absolute encoders.

Easiest is to move the Y-axis with the MPG in HANDLE mode as close as possible to where reference...

Check prm905
Should be 00000001 depending on the number of steps in the ladder.

Do you get alm 300 or similar Y axis needs zrn?

If so, then the machine is probably fitted with absolute encoders.

Try to clean the contacts on the large relay for the "input unit". The relay has a clear plastic cover and is mounted upright on a metal bracket next to a spark killer on the "input unit" metal base....

Maybe try to swop out the motors.

Check parameter 2020 X and Y. If, and only if these values are the same you can do the following:
1.Swap the JF1 and JF2 cables on the servo amp. This is for a...

Thanks to DMF_TomB and dcoupar for the info.