I was given a project completed by another group, they had left school and I was taking over the project from them, with the information that it is not working properly because "something burnt out or is broken".
The system consists of several electronic devices, which I'm not exactly sure what they are, two of them are microcontrollers.
I figure I can test the system with a multimeter to discover which part is broken and needs replacing. How do I go about doing this? What mode and where should I be looking to probe?
If more information is required please ask and I'll do my best, I can provide a photo if it's necessary, but I'm more after the general process of doing this instead of for my particular case.
Part schematic provided by previous group: https://i.stack.imgur.com/cfW2l.png
Picture of the project: