Troubleshooting a 5V Apple III
mmaginnis at gmail.com
Sun Aug 22 14:05:54 CDT 2010
On 8/22/2010 12:19 PM, Richard wrote:
> In article<4C7160FF.4060009 at gmail.com>,
> Mike Maginnis<mmaginnis at gmail.com> writes:
>> Can anyone suggest a starting point for tracking this down?
> I'm not familiar with the Apple III schematics. Does the motherboard
> include video?
> If so, then it sounds like everything's good but you have a bad video
> section. I'd start looking at capacitors and if you have a high
> bandwidth scope it might be instructive to look at the video out to
> see if you're getting any sort of video timing at all (sync signals,
The motherboard has both composite and digital XRGB video outputs. I've
been working with a composite monitor, as I don't have a compatible RGB
model. Unfortunately, I don't have a scope or anything more advanced
than a multimeter to troubleshoot with.
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