C103225 REV.2
Posted: 06 May 2023 16:06
Here is my C103225 REV.2 STFM board awaiting mandatory upgrades and 4 Meg upgrade.
:thanksyellow:
One of those odd revisions I don't seem to see very often.
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From what I can see looking at a bunch of schematics, the reset circuit is much the same across all boards and uses a 556 IC labelled either U2 or U37, so you'll be looking at the electrolytic caps surrounding that and that are connected to it.MacTech05 wrote: 28 May 2024 08:05 KD4CBM,
That is same motherboard I have in my 1040 STFM. You don't happen to have a schematic specific to the motherboard, do you? I am trying to locate the Reset circuit capacitors so I can replace them.
Thank you
Randy
:girldance:MacTech05 wrote: 06 Jun 2024 13:34 rubber_jonnie,
Thank you for the info on finding the Reset Circuit capacitors on my 1040 STFM. While I still have not found a schematic for my 1040 STFM motherboard, I did find and download a different 1040 STFM motherboard schematic. Based on your information, I found the Reset Circuit capacitors immediately on the schematic and on my motherboard. I have replaced the capacitors.
Thank you!
Randy