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Re: 1040 STF...Unlucky :)
Posted: 21 Oct 2019 20:16
by 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.
Re: 1040 STF...Unlucky :)
Posted: 21 Oct 2019 21:15
by Marsupilami
exxos wrote: 21 Oct 2019 20:16
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:
Re: 1040 STF...Unlucky :)
Posted: 21 Oct 2019 21:33
by exxos
Marsupilami wrote: 21 Oct 2019 21:15
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
Re: 1040 STF...Unlucky :)
Posted: 23 Oct 2019 01:42
by 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" )
Re: 1040 STF...Unlucky :)
Posted: 23 Oct 2019 05:36
by 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.
Re: 1040 STF...Unlucky :)
Posted: 26 Oct 2019 10:08
by 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
Re: 1040 STF...Unlucky :)
Posted: 26 Oct 2019 10:27
by exxos
Marsupilami wrote: 26 Oct 2019 10:08
I removed all the old RAM : It's alive ! :yay2: :thanksyellow:
:bravo: :cheers:
Marsupilami wrote: 26 Oct 2019 10:08
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.
Marsupilami wrote: 26 Oct 2019 10:08
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.
Marsupilami wrote: 26 Oct 2019 10:08
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.
Re: 1040 STF...Unlucky :)
Posted: 26 Oct 2019 13:17
by 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
Re: 1040 STF...Unlucky :)
Posted: 26 Oct 2019 15:42
by DoG
Seems that the switch needs power to work? 1Mb/4Mb switching should be done before you turn the computer on.
Re: 1040 STF...Unlucky :)
Posted: 27 Oct 2019 01:27
by Cosmic Puppet
Marsupilami wrote: 26 Oct 2019 10:08
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: