Page 10 of 16
Re: Trying to fix Mikro's wrecked TT board
Posted: 27 Apr 2025 12:15
by dml
Cat can even find a single warm capacitor to sit on.
Screenshot 2025-04-27 at 12.14.56.png
Re: Trying to fix Mikro's wrecked TT board
Posted: 27 Apr 2025 12:18
by exxos
dml wrote: 27 Apr 2025 12:15
Cat can even find a single warm capacitor to sit on.
:lol:
Re: Trying to fix Mikro's wrecked TT board
Posted: 27 Apr 2025 12:18
by dml
Screenshot 2025-04-27 at 12.17.48.png
:D
Re: Trying to fix Mikro's wrecked TT board
Posted: 27 Apr 2025 12:19
by exxos
:bravo: :2k2: :girldance:
Re: Trying to fix Mikro's wrecked TT board
Posted: 27 Apr 2025 12:35
by mikro
Details, details, details!!!
Re: Trying to fix Mikro's wrecked TT board
Posted: 27 Apr 2025 12:38
by dml
Screenshot 2025-04-27 at 12.37.31.png
:D
Re: Trying to fix Mikro's wrecked TT board
Posted: 27 Apr 2025 12:39
by dml
Screenshot 2025-04-27 at 12.37.44.png
\o/
Re: Trying to fix Mikro's wrecked TT board
Posted: 27 Apr 2025 12:55
by dml
So there is something wrong with that buffer IC.
With inputs low, outputs were not correct for TTL - less than 3V.
When I removed the IC and socketed it, I randomly tried it again (since I have not found a replacement yet) and the machine woke up unexpectedly, started booting GEM.
I have left it for a while and its started being flaky again but when I heated the IC with the soldering iron it's again booting GEM and outputs are 4.8V.
The IC seems to be damaged in some way, I'll need to find a replacement to confirm properly.
There is still something funny with the power-on reset sequence vs reset button - but I'll come back to that later. I need to figure out how to rig up storage so I can make sure the machine is mostly working.
I should also spend some time with the diagnostic cart now that the remaining ICs are restored.
...and the daughter board has not been tested yet either.
Re: Trying to fix Mikro's wrecked TT board
Posted: 27 Apr 2025 14:11
by Steve
@dml that's some awesome progress man! So good to see that little green desktop!
Re: Trying to fix Mikro's wrecked TT board
Posted: 27 Apr 2025 14:15
by PhilC
Steve wrote: 27 Apr 2025 14:11
@dml that's some awesome progress man! So good to see that little green desktop!
Gotta agree with Steve, well done
@dml