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Atari 400 video


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I have a second hand 400 that lights up with power but no pic or sound. What should I look for?

The LED on the 400/800 is powered by the -5VDC supply, regulated by a zener diode. You can check if the +5V and +12V supplies are functional on the SIO socket, pins 10 & 12, +12V only applies to the 400/800. This lets you check the voltages without actually opening the case.



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