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I think that the first step is the testing of mechanical or manual way to find out where the malfunctions mean briefly identify the problem is the first step for the maintenance of any machine.
Before troubleshooting any problem, You should have clear knowledge about that machine hardware and its working procedures. To make sure the source of the fault, you have to divide the Issues in smaller parts. For example-
1. Does the trouble raised from the power source?
2. Does the problem raised from hardware or software?
3. If hardware, in which conditions does the fault appear?
4. If software, which software or command or file generates the problem?
5. It may be caused by over heat. If so then how long the machine can run or how much load can the machin bear before the problem arise?
6. You may need to dismantal the machine and run it with minimum hardware that it can start with. If machine runs well then add one hardware and test again. Carryout the same procedure untill the problematic hardware is diagonosed.
Hope this will help you most.
Better to know first about what happens from the operator then gather documentaries like, schematics, equipment history of operation like parameters, and manuals.
