Ps1 wont read controller if memory card is in.

Hello, I think I have an idea about the issue, assuming the PlayStation can deliver 1A of current in each socket (memory + controller) and the controller draws 0.9A while the memory card draws 0.1A, so the equation here is:

PlayStation = 0.9*Controller + 0.1*Memory

Now if the controller or the memory card draw more than what are rated for then one of them or all will not work but since the memory card amperage is very low compared to the controller than it might work alone.

In other words, either your console has a problem and cannot deliver enough power to the socket or your memory card or controller draw more current than usual, so I suggest that we diagnose this step by step.

First, we need to check the voltages on the socket, you need a multimeter for that and if you’re not familiar with electronics then you can ask someone else for help, or you can wait for another answer maybe my theory is wrong.

Can you confirm that you have the necessary tools so I can begin to search the right values please?