Basically there were contact pads on either side of the console, dust, debris, etc. Would get on the pads and they couldn’t get proper connection. So blowing was a way to get them clean.
The other issue is that because you had to insert and remove cartridges it would inevitably wear out the pads on the console. And eventually it would get so worn down they wouldn’t work. Though this did usually take a lot to happen.
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