720 Degrees Audio

zz0ljf

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I picked up a non-working 720 a couple of weeks ago for a steal. It's been too cold to work on it until the heat wave this weekend but I now have it fully functional with the exception of about 31 of the sounds from the self test menu. The test indicates that there should be 137 sounds, but there's a few random ones not working. For the most part there doesn't appear to be a pattern, but I do have a gap from 0-5 and 23-41. All the other missing sounds are completely random. The RAM, ROM, & Processor tests pass. What would cause this? Do I have a corrupted sound effects chip somewhere?
 
If the sounds that are missing are always the same ones, I'd start by verifying/reburning your sound ROMs.

If, for instance, 34 is there and then gone the next time you run tests, you've got something else going on....
 
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