I replaced C90 and have the same symptoms. I'll now dig out my eprom programmer and read in the main ROM. I still need a known good rom dump to compare to. Anyone have one of those?
Thanks, Jeff From: M100 <[email protected]> On Behalf Of Fugu ME100 Sent: Sunday, April 29, 2018 11:14 AM To: [email protected] Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 4. You could also check the Electrolytic Cap on the reset line it may of leaked too which could impact the reset timing. C90 is the only electrolytic that seems to be part of the reset circuitry. I have not changed it and it is of the same manufacture as the other ones that did leak. Interesting how it is all caps of that one brand/series that leak. I never noticed the brand on the ones I replaced they all seemed to be bad :) I have had the reset cap fail which caused some weird behavior. Although pressing reset after power on usually works. 5. The new NiCd might need some more time to charge up. The NiCad is removed which I think should be OK as I should still get VS? Not sure about this it should work, the NiCd only backs up the RAM. It could mean the RAM starts up with garbage every time you power on. Could try a power on then perform a clean boot by using the reset button rather than power on sequence to clear out the RAM. One other thing to check is the soldering in the area of the clock chip. I have two M100s that had bad soldering in that area, just a matter of retouching joints that look bad. It was so bad there were bubble holes in the solder. The build quality on the M100 is quite atrocious.
