Draxxs Posted July 30, 2022 Share Posted July 30, 2022 From the 1050 Field service manual. 4. RAM Check Unique values are written to each RAM location, and then each location is read to verify It contains the correct value. Upon error, the processor will flag ERROR and discontinue testing. Quote Link to comment Share on other sites More sharing options...
naujoks Posted July 31, 2022 Author Share Posted July 31, 2022 Can I ask on which page of the field service manual you found this line? I just can't find it. Quote Link to comment Share on other sites More sharing options...
TGB1718 Posted July 31, 2022 Share Posted July 31, 2022 (edited) Page 31 If the Error flag is set, then the next line states Edited July 31, 2022 by TGB1718 Quote Link to comment Share on other sites More sharing options...
Draxxs Posted July 31, 2022 Share Posted July 31, 2022 You might have the short version of the manual. There are two of them out there. 1050fsm.pdf is the file name of the one I found that has quiet a bit more information and a cleaned up schematic. I am still fighting my drive as well. My situation is not a full failure and has become quite the pita. I can see the problem on a scope but cannot figure out where its source is. I know more about 1050's than i wanted to. Good luck with yours. 1 Quote Link to comment Share on other sites More sharing options...
naujoks Posted July 31, 2022 Author Share Posted July 31, 2022 Thanks, I indeed only had the curtailed version of the manual. Glad to see that the RAM check happens before seeking track 0. I will now wait another few weeks for the replacement RAM. Meanwhile I'm still wondering if shorting pin 1 and 2 of J10 is supposed to make the r/w move, irrespective of the control logic. Quote Link to comment Share on other sites More sharing options...
TGB1718 Posted July 31, 2022 Share Posted July 31, 2022 I wouldn't think so, all your doing is shorting out the track zero sensor and as the drive appears to be in a fault condition, then there should be no head movement. For the head to move, the PIA (6532) needs to be controlled by the CPU as it's outputs drive the stepper motor so if in a fault mode, I think the processor will be doing no more than spinning the disk. Quote Link to comment Share on other sites More sharing options...
Draxxs Posted July 31, 2022 Share Posted July 31, 2022 I agree with TGB1718. Until all conditions in that list are met you will be hung up in a forever loop as per #5 of the list. The head seek is done on step 6 of that listing. Step 5 runs the spin loop forever on any fault in 1-4. Quote Link to comment Share on other sites More sharing options...
+kheller2 Posted July 31, 2022 Share Posted July 31, 2022 It would be good to know under what conditions the motor just spins (no off and on). I always took that as a major fault that the code couldn't even complete enough test to get to the on/off failure. See the problem here is that you just don't own enough 1050s. You need at least a dozen Quote Link to comment Share on other sites More sharing options...
naujoks Posted August 1, 2022 Author Share Posted August 1, 2022 Ha! It's true, I only have one, clearly that's not enough. I'm quite optimistic that the RAM will make a difference. It's actually the first component I was able to test faulty. Had my field service manual had all pages, I wouldn't have bought the FDCs first. Quote Link to comment Share on other sites More sharing options...
+kheller2 Posted August 1, 2022 Share Posted August 1, 2022 3 hours ago, naujoks said: Ha! It's true, I only have one, clearly that's not enough. I'm quite optimistic that the RAM will make a difference. It's actually the first component I was able to test faulty. Had my field service manual had all pages, I wouldn't have bought the FDCs first. Folks, I know we are all using slightly different service manuals for the 1050. But I reconstructed one from all the PDFs, hard copies, and stollen schematics I could find. https://archive.org/details/1050FSMRebuiltAKH if there are sections missing please let me know! 1 Quote Link to comment Share on other sites More sharing options...
naujoks Posted August 18, 2022 Author Share Posted August 18, 2022 The 6810 RAM arrived today and now the drive WORKS! I'm so happy! So it was only the RAM and nothing else. Note to future fault finders: Work through the list of power on checkup in order! Last two things: which part of the spindle motor can I lubricate to make it run a bit smoother? Can the power transistors (or mosfets) be replaced with a modern, more efficient part? They run so hot! 2 Quote Link to comment Share on other sites More sharing options...
TGB1718 Posted August 18, 2022 Share Posted August 18, 2022 Anything you use will get hot, it's just the current flowing through the transistor which will be the same. Quote Link to comment Share on other sites More sharing options...
Draxxs Posted August 18, 2022 Share Posted August 18, 2022 You can use some sewing machine oil to lube the spindle. The bearing in one of my drives were basically froze up. I used a combination of wd40 and sewing machine oil to free up the spindle bearings. Heat is pretty normal, the reason for the big heatsink. I have seen some use some switching regulators but many have had problems doing this with the noise the switching regulators were injecting into the system. Replacing the electrolytic cap in the drive is probably a better use of your time and $$. They seem to have a pretty high fail rate over time. Quote Link to comment Share on other sites More sharing options...
+kheller2 Posted August 18, 2022 Share Posted August 18, 2022 I haven't heard of complaints using the Traco converters, but they are expensive... https://mathyvannisselroy.nl/Atari 1050 goes green.htm Quote Link to comment Share on other sites More sharing options...
+bf2k+ Posted August 18, 2022 Share Posted August 18, 2022 On 7/31/2022 at 3:52 PM, kheller2 said: See the problem here is that you just don't own enough 1050s. You need at least a dozen True. I would be happy to sell him 5. Quote Link to comment Share on other sites More sharing options...
xrbrevin Posted August 18, 2022 Share Posted August 18, 2022 you can also use those drop-in replacement 'buck converters' that are a small bare PCB. just be careful as some have a trimpot for output voltage - i prefer a fixed type Quote Link to comment Share on other sites More sharing options...
+Peter Rabitt Posted August 18, 2022 Share Posted August 18, 2022 Just in case you may have not read there is a thread about the switching reg. It was at the end of a thread about a floppy drive that the OP was fixing and added the SW. reg and the drive failed to work... Turns out the OP e-mailed/called the company and found out there is a RF field around the devices and can cause trouble with the pick up heads of the drive.. Also the SW. reg do not like switching into a cap load (470uf, I think) so the OP had to take out the output cap's of the 5,0 and 12.0volt line... My xf551 has the problem also but have been doing other things so I have not got back to the problem with it.. The OP did get the drive working and a guess the heat problem was reduced ... I know the heat of the XF551 was way lower but the drive does not work... Peter 1 Quote Link to comment Share on other sites More sharing options...
+kheller2 Posted August 19, 2022 Share Posted August 19, 2022 I remember that thread. Somewhere. I wonder if Traco units are better at isolation. Here is an interesting read over my head : https://www.ti.com/lit/ml/slyp091/slyp091.pdf Quote Link to comment Share on other sites More sharing options...
rcamp48 Posted August 19, 2022 Share Posted August 19, 2022 Here is the latest video with most of the 8 BBS's listed at the logoff screen, I have to add the other 10 or so tomorrow, and add new 'key' and 'lock' screens , as well as welcome screens Here is the video: I am going home now: How I am contributing to the Atari Community While I am not at the warehouse the BBS has been running now for 3 days , I will leave it up over night, as far as I know I have blocked the once thing that will crash it, the BBS listing. So if you feel like testing it I will be at home with my laptop and I can quickly validate you, there are 700 or more MIDI files online, they list and load but when I go to download them I get control X character and it aborts. Quote Link to comment Share on other sites More sharing options...
naujoks Posted August 19, 2022 Author Share Posted August 19, 2022 14 hours ago, rcamp48 said: Here is the latest video with most of the 8 BBS's listed at the logoff screen, I have to add the other 10 or so tomorrow, and add new 'key' and 'lock' screens , as well as welcome screens Here is the video: I am going home now: How I am contributing to the Atari Community While I am not at the warehouse the BBS has been running now for 3 days , I will leave it up over night, as far as I know I have blocked the once thing that will crash it, the BBS listing. So if you feel like testing it I will be at home with my laptop and I can quickly validate you, there are 700 or more MIDI files online, they list and load but when I go to download them I get control X character and it aborts. ??? Quote Link to comment Share on other sites More sharing options...
+DjayBee Posted August 19, 2022 Share Posted August 19, 2022 4 hours ago, naujoks said: ??? Who cares about the topic of a thread? 🤪 1 Quote Link to comment Share on other sites More sharing options...
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