Originally Posted by AgX
To my knowledge there was not such as T-90 diagnosis computer (a good idea though). At least there is no diognosis plug at the camera circuit to connect to a diagnosis computer.
I just bought a pristine but dead T-90. I shall still try to cope with the eletrical/electronical fault by means of multimeter and oscilloscope.
I saw a reference somewhere to the earlier Canon electronic cameras being diagnosed via something that slid into the hot shoe. There are a bunch of contacts there...