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Bad resistor?

Problems with your machine in general.
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jan.pohan
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Bad resistor?

Post 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
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exxos
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Re: Bad resistor?

Post 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.
tzok
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Re: Bad resistor?

Post 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).
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rubber_jonnie
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Re: Bad resistor?

Post 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
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
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jan.pohan
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Re: Bad resistor?

Post 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
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exxos
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Re: Bad resistor?

Post 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.
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