spookt Posted April 10, 2023 Share Posted April 10, 2023 (edited) Pulled what I thought was a known good 1050 off the shelf as someone on Facebook was looking for a tested unit. This 1050 was tested good in June 2021, and probably hasn't been tested since. It has been stored in dry and temperate conditions. On power up there is no drive motor activity. All major ICs test good on a working board. Checking schematic and doing some tracing I found some nasty corrosion damage and at least one broken trace due to leaky 47uF caps in the motor control circuit and elsewhere. All the same type and value. This is the first time I've had damage in an Atari peripheral due to bad caps, perhaps I've been lucky? Time for some cleanup and trace repair! Edited April 10, 2023 by spookt spelling! Quote Link to comment Share on other sites More sharing options...
Peri Noid Posted April 10, 2023 Share Posted April 10, 2023 You were. It looks like these were replaced. Very badly replaced. And they need some care. Quote Link to comment Share on other sites More sharing options...
Paul Westphal Posted April 10, 2023 Share Posted April 10, 2023 Nice work. I never fancied myself a disk drive repair guy, but basic knowledge can get these things up and running. Quote Link to comment Share on other sites More sharing options...
spookt Posted April 11, 2023 Author Share Posted April 11, 2023 A couple of hours under the scope and she lives again. Caps replaced, corrosion removed and broken traces restored. I might just pull the rest of my 1050s and check for leaky caps or corrosion … 2 Quote Link to comment Share on other sites More sharing options...
TZJB Posted April 11, 2023 Share Posted April 11, 2023 1 hour ago, spookt said: A couple of hours under the scope and she lives again. Caps replaced, corrosion removed and broken traces restored. I might just pull the rest of my 1050s and check for leaky caps or corrosion … Excellent work. Another restored and working Atari 1050 Disk Drive. Leaky capacitors are quite unusual for the 1050 drives. They normally just dry out and short. Incidentally were you ever a member of TWAUG? Quote Link to comment Share on other sites More sharing options...
Iguana Bob Posted April 11, 2023 Share Posted April 11, 2023 He mentioned that they had been previously replaced, likely bad caps from the early 2000s. They were in everything. Had it not been recapped, it probably would have been fine. 2 Quote Link to comment Share on other sites More sharing options...
SlagOMatic Posted April 12, 2023 Share Posted April 12, 2023 Nice job. 🙂 I recently recapped five 1050s, plus replaced their drive belts, replaced the regulators, gave the boards a sonic cleaning, cleaned/lubricated the mechanisms, and installed Happy upgrades. One of them has a timing issue (not related to the caps) but the other four are running fine. Quote Link to comment Share on other sites More sharing options...
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