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I know RoboDK and FANUC PC Dev KIT, but they are not free.

It has been 26 years, the controller might have reached the end of its life, better change a new controller.

Have you ever considered an NC based controller?
They said NC based is more reliable than PC based control card.

Try to closed mach and restart the program

You can find Fuling DBZ 300 inverter user manual at below link for your reference.
https://www.paycnc.com/info/fuling-dzb200-dzb300-inverter-user-manual_i2687.html

What is the required model name, maybe can find on line.

This is unusual, you might need to check if there is any leaking behind the turret.

Normally the CNC will lubricates automatically, the time intervals can be set by CNC controller parameters.
You can also mark the oil level on the oil tank, and see if it gets lower after running...

Attaching photos or videos could be more easy to understand the problem.
like cnc and driver model names, alarm codes on cnc and drivers, etc.

You can try them and share the experiences here, thank you.

Alarm 08 means High input voltage.
Input voltage seems not stable.

It will be more helpful if you can post the photos of the servos and their labels, that would be easier to find.

Have you checked the spindle motor and its wiring?

Maybe the manual in below link can help.
https://www.paycnc.com/info/varispeed-626vm3-manual_i2675.html

Some drivers need to do EE-DEF procedure after replacing a new AC servo driver

Step 1: PA0=385
Step 2: PA1 change to match the motor
Step 3: Find EE-DEF, press the ENTER key and hold 3...

In most cases it is caused by the battery, you can replace a new battery and see if the problem solved or not.

If the motor is use too much current we can check below:

1. Poor spindle lubrication

2. Spindle bearing damage

3. Spindle motor failure

4. The spindle workload is too heavy

You forgot to attach the pictures?

The problem might come from the CNC or PC or Cable connection.
Since the touch screen also failed, then most possibly the problem from the the CNC side.

I don't think the firmware is available for users, if the MR-J2S-A has problem, maybe need to get a new one to replace it.

You forgot to attached the machine photos?

Any alarm code on the spindle driver?

Interesting and impressive.
What does the customade spindle servo drive look like?

Ci-dessous pour votre référence.

J'ai travaillé avec un DL-150 ici dans notre magasin qui a commencé à nous donner une alarme EX0999 lorsque vous appuyez sur les boutons de serrage de broche ou de...

Maybe the used control unit you bought is only 3 axes version.
The prices of 5 axes and 3 axes are different, if the hardwares are the same, then can be upgraded by parameter setting, but need to...

Is it connected by bluetooth or WIFI?
sometimes the wireless connection is not so stable.

Press and hold the overtravel release button without releasing it.
At the same time, in the handwheel mode, select the Y-axis and move the Y-axis back in the opposite direction to the overtravel, ...

It seems about pitch error compensation problem.

Ser-Err (Servo Error) during first home find initiation.
Ser-Err (Servo Error) upon indexing.

Possible causes:
1- Faulty main cable or cable connector.
2- Table driving a heavy load.
3- Table...

Nice cards, good idea!