1040 STF...Unlucky :)

[exxos]

Your next step choices are to remove the old RAM, and/or change the bus resistors to 2.2K and see if that fixes the problem.

[Marsupilami]

Your next step choices are to remove the old RAM, and/or change the bus resistors to 2.2K and see if that fixes the problem.

Ok thanks hum...Where are the bus resistors ? :roll:

[exxos]

Ok thanks hum...Where are the bus resistors ? :roll:

see bottom of this page.. Though I missed one pack and its near the MFP. I've not had chance to do a guide to this yet unfortunately.

https://www.exxosforum.co.uk/atari/last/ ... /index.htm

[Marsupilami]

OK, just to be sure, do i have the change the 8 resistors ?



(sorry, for the external picture, i can't add any file with the "Attachment tab" )

[DoG]

If I can remember correctly it's only 5 of them. On the C070787, RP2 and RP3 are the data bus and RP4, RP6 and RP8 are the data bus.

[Marsupilami]

A few hours later...
I removed all the old RAM : It's alive ! :yay2: :thanksyellow:
I still have not changed the SIL 10k resistors: Should I ?
What do I do with R59,R60,R61, R71,R72,R73 resistors, do I leave it like this or should i remove them ?
I also figured out that C49, the big blue capacitor 16v 1000uf (near U25 - U30) is a bit damaged, i will change it : I don't know if size matters but Conrad has only one Axial wich look tiny :https://www.conrad.com/search?search=16 ... pe=regular Do you have a good source or advice for a replacement ?

20191025_190737.jpg

20191025_190618.jpg

[exxos]

I removed all the old RAM : It's alive ! :yay2: :thanksyellow:

:bravo: :cheers:

I still have not changed the SIL 10k resistors: Should I ?

If your not having issues then maybe not, but I would suggest you change them at some point anyway.

What do I do with R59,R60,R61, R71,R72,R73 resistors, do I leave it like this or should i remove them ?

Pull um out, they not used anymore.

I also figured out that C49, the big blue capacitor 16v 1000uf (near U25 - U30) is a bit damaged, i will change it : I don't know if size matters but Conrad has only one Axial wich look tiny :https://www.conrad.com/search?search=16 ... pe=regular Do you have a good source or advice for a replacement ?

Stick in a panasonic FR 4700uf 16V.. Its radial, but you got room to bodge it in.

[Marsupilami]

Ok, thanks a lot Exxos for your help :thumbup:

Next step will be to add a touch key self-locking switch under the keyboard like this to select between 1M or 4M.

Touch-Key.gif

[DoG]

Seems that the switch needs power to work? 1Mb/4Mb switching should be done before you turn the computer on.

[Cosmic Puppet]

A few hours later...
I removed all the old RAM : It's alive ! :yay2: :thanksyellow:
I still have not changed the SIL 10k resistors: Should I ?
What do I do with R59,R60,R61, R71,R72,R73 resistors, do I leave it like this or should i remove them ?
I also figured out that C49, the big blue capacitor 16v 1000uf (near U25 - U30) is a bit damaged, i will change it : I don't know if size matters but Conrad has only one Axial wich look tiny :https://www.conrad.com/search?search=16 ... pe=regular Do you have a good source or advice for a replacement ?

20191025_190737.jpg
20191025_190618.jpg

:bravo: