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Bad resistor?

Posted: 07 Jun 2019 19:46
by jan.pohan
Hello i have opened my Atari Ste, for checking DMA version, and i have found nearby DMA chip /square one/ this leaking resistor (see picture attached). But Atari works fine. Is it possible still save board? i have paid quite lot for this ste... thank for advices

Re: Bad resistor?

Posted: 07 Jun 2019 20:08
by exxos
That will be flux.. something has been messing with the resistors and made a bit of a bad job of it by the looks of it.

Re: Bad resistor?

Posted: 07 Jun 2019 21:26
by tzok
These are not even resistors, but just a fancy jumper wires... apparently someone moved them from one position to another from the top (without removing the board from bottom case).

Re: Bad resistor?

Posted: 07 Jun 2019 22:52
by rubber_jonnie
As tzok said, zero ohm resistors used as links. I'm guessing they were moved to change or upgrade the TOS ROMs. As exxos said, looks like a poor soldiering job, but you can probably clean up the flux with isopropyl alcohol

Re: Bad resistor?

Posted: 07 Jun 2019 23:31
by jan.pohan
Thanx guys for quick help. So it seems someone upgraded TOS chips probably? It has 1.62, but i thought it was standart for 1040 STE manufactured in 1990 and later... But TOS chips could be changed also because of language i think.
Also could you say if this is original floppy?
I was decided to do proffesional recap immediatelly, should i do it anyway or is it risk for board?

Thanx a lot

Re: Bad resistor?

Posted: 07 Jun 2019 23:34
by exxos
Looks like original floppy.. STE machines mostly had 1.62 fitted, but early ones had 1.06... Most upgrade to 206 these days. Recapping the PSU should be done at least.