lopezpb Posted August 22, 2018 Share Posted August 22, 2018 (edited) I try to repair Atari 1050 disk drive. I checked electronics and it is fully working but I found that the stepping motor is faulty Maybe you know where could buy stepping motor for Atari 1050? or maybe there are any replacements? or from what other disk drive can it be replaced? In my disk drive I have installed: Type: KP7AP2-003Tandon 2103231.8 deg/step, DC 12V Edited August 22, 2018 by lopezpb Quote Link to comment Share on other sites More sharing options...
+Nezgar Posted August 22, 2018 Share Posted August 22, 2018 BEST Electronics catalog part # FC100520 "1050, Indus Stepper Motor" $18.00 catalog price, may have changed http://www.best-electronics-ca.com/ Quote Link to comment Share on other sites More sharing options...
+Nezgar Posted August 22, 2018 Share Posted August 22, 2018 The Tandon mechanism in the 1050 is known as TM-50-1 (Single Sided) . It's Used in many other computers/ drives, and IBM PC's. The Atari version is stripped of most of the controller hardware that would be attached on a version for a PC, or external controller. ie, here's a hardware service manual that shows the extra circuitry not present on the 1050 version (Since its below the drive instead) https://archive.org/details/Tandon_TM-50_Service_Manual_1983_Tandon Sometimes when scouring the Internet for spare parts, including TM-50 in keywords can help. For example, this site has belts for IBM PCjr disk drive that is for the same TM-50 mech of the Atari 1050: https://console5.com/store/atari-1050-ibm-pcjr-qumetrak-142-floppy-drive-spindle-belt.html 2 Quote Link to comment Share on other sites More sharing options...
+kheller2 Posted August 22, 2018 Share Posted August 22, 2018 The Tandon mechanism in the 1050 is known as TM-50-1 (Single Sided) . It's Used in many other computers/ drives, and IBM PC's. The Atari version is stripped of most of the controller hardware that would be attached on a version for a PC, or external controller. ie, here's a hardware service manual that shows the extra circuitry not present on the 1050 version (Since its below the drive instead) https://archive.org/details/Tandon_TM-50_Service_Manual_1983_Tandon Sometimes when scouring the Internet for spare parts, including TM-50 in keywords can help. For example, this site has belts for IBM PCjr disk drive that is for the same TM-50 mech of the Atari 1050: https://console5.com/store/atari-1050-ibm-pcjr-qumetrak-142-floppy-drive-spindle-belt.html Hmm.. "Note that the original drive belts are fabric reinforced but that style is no longer available. These replacements are pure rubber but functionally identical." I would think the fabric lasted longer and didn't stretch as much.. but I'm not a materials science guy Quote Link to comment Share on other sites More sharing options...
Fred_M Posted August 22, 2018 Share Posted August 22, 2018 If you are in Europe, maybe I can help. I sell (broken) tandon drives for € 5,- each ex. shipping. https://www.rewindgames.eu/opencart/Atari-shop/Atari_spareparts/tandom-drive-defects Quote Link to comment Share on other sites More sharing options...
xrbrevin Posted August 22, 2018 Share Posted August 22, 2018 thanks for posting the image, i wondered what the inside looks like Quote Link to comment Share on other sites More sharing options...
lopezpb Posted August 22, 2018 Author Share Posted August 22, 2018 (edited) If you are in Europe, maybe I can help. I sell (broken) tandon drives for € 5,- each ex. shipping. https://www.rewindgames.eu/opencart/Atari-shop/Atari_spareparts/tandom-drive-defects Yes, I'm very interested. I'm from Poland, can you give me shipping cost ? Edited August 22, 2018 by lopezpb Quote Link to comment Share on other sites More sharing options...
Fred_M Posted August 22, 2018 Share Posted August 22, 2018 (edited) All details are on the website, but shipping costs for Poland are € 11.75 tracked and insured. Sadly DPD does not have pick up points in Poland, for many countries that option is cheaper :-( Edited August 22, 2018 by Fred_M Quote Link to comment Share on other sites More sharing options...
Kyle22 Posted August 22, 2018 Share Posted August 22, 2018 Please be aware that it will be necessary to re-align the drive after the stepper is replaced. 1 Quote Link to comment Share on other sites More sharing options...
lopezpb Posted August 23, 2018 Author Share Posted August 23, 2018 Please be aware that it will be necessary to re-align the drive after the stepper is replaced. Yes, I expected that, but first I have to buy one. Then I will try to alignment. 1 Quote Link to comment Share on other sites More sharing options...
lopezpb Posted September 8, 2018 Author Share Posted September 8, 2018 Thanks to Fred_M, the station is 100% operational again. Of course I had to align the head and track zero sensor, but 1050 works perfectly now! 6 Quote Link to comment Share on other sites More sharing options...
Fred_M Posted September 9, 2018 Share Posted September 9, 2018 Great to hear! Congrats 1 Quote Link to comment Share on other sites More sharing options...
kbj Posted March 1, 2021 Share Posted March 1, 2021 Hi All, Sorry to hijack this old thread, but I'm looking for a stepper motor for my Atari 1050 - the label says Northland part number 1005-104 - picture attached. It has a Tandon REV L EPROM in it. If anyone can point me in the direction of a replacement, I would be very grateful. Many thanks, Mark. Quote Link to comment Share on other sites More sharing options...
+bob1200xl Posted March 2, 2021 Share Posted March 2, 2021 Where are you located? Unless you have known good spares, it is difficult to test something like this. You might as well get a complete drive which is easier to verify. If I pull one off of a working 1050 I end up with a non-functional floppy. Got too many of those... Bob Quote Link to comment Share on other sites More sharing options...
kbj Posted March 2, 2021 Share Posted March 2, 2021 1 minute ago, bob1200xl said: Where are you located? Unless you have known good spares, it is difficult to test something like this. You might as well get a complete drive which is easier to verify. If I pull one off of a working 1050 I end up with a non-functional floppy. Got too many of those... Bob Hi @bob1200xl I'm in Scotland, UK. It seems that the only place I could find one would be in a working drive.. I was hoping someone would know of a replacement part that I could drop in or maybe a part from a dead drive that was beyond repair board wise.. I have been posting in another thread with Nezgar about fault finding on the drive. I have working spares for the FDC, 6507, 6532 and the EPROM which have all been replaced without much success. The stepper motor won't move and I'm getting the 2sec on/off thing happening. I've ordered a track 0 sensor that someone else recommended as a drop in replacement to see if it's that causing the issue. Thanks, Mark. Quote Link to comment Share on other sites More sharing options...
blacka013 Posted March 2, 2021 Share Posted March 2, 2021 Hi kbj, which thread have you posted in with Nezgar? Regards Andy Quote Link to comment Share on other sites More sharing options...
kbj Posted March 2, 2021 Share Posted March 2, 2021 6 minutes ago, blacka013 said: Hi kbj, which thread have you posted in with Nezgar? Regards Andy Hi @blacka013 Here: Atari 1050 UDN5713M chips question - Atari 8-Bit Computers - AtariAge Forums Many thanks, Mark. Quote Link to comment Share on other sites More sharing options...
+Nezgar Posted March 2, 2021 Share Posted March 2, 2021 Hang on folks, I'm not convinced that @kbj's stepper is the problem yet. Process of elimination is pointing to the FDC socket or something related to it at this time. Here is the troubleshooting thread: Quote Link to comment Share on other sites More sharing options...
+skr Posted April 19, 2021 Share Posted April 19, 2021 On 3/2/2021 at 8:31 PM, kbj said: Hi @bob1200xl I'm in Scotland, UK. It seems that the only place I could find one would be in a working drive.. I was hoping someone would know of a replacement part that I could drop in or maybe a part from a dead drive that was beyond repair board wise.. I have been posting in another thread with Nezgar about fault finding on the drive. I have working spares for the FDC, 6507, 6532 and the EPROM which have all been replaced without much success. The stepper motor won't move and I'm getting the 2sec on/off thing happening. I've ordered a track 0 sensor that someone else recommended as a drop in replacement to see if it's that causing the issue. Thanks, Mark. If you still are searching, please contact floppydoc@abbuc.de, he might be able to help you. Quote Link to comment Share on other sites More sharing options...
kbj Posted April 20, 2021 Share Posted April 20, 2021 12 hours ago, skr said: If you still are searching, please contact floppydoc@abbuc.de, he might be able to help you. Hi @skr Thanks for the info! I'll bear that in mind should I get another drive to repair. I did get the drive working in the end - and it turned out that it wasn't the stepper motor in the end - it was the FDC chip and a broken tacho return wire to the spindle motor. Replaced/repaired that and after a bit of calibration the drive was good once more. KbJ 1 1 Quote Link to comment Share on other sites More sharing options...
+DjayBee Posted April 20, 2021 Share Posted April 20, 2021 15 hours ago, skr said: If you still are searching, please contact floppydoc@abbuc.de, he might be able to help you. He recently wrote on the ABBUC forums that he ran out of steppers. Quote Link to comment Share on other sites More sharing options...
kbj Posted April 20, 2021 Share Posted April 20, 2021 6 minutes ago, DjayBee said: He recently wrote on the ABBUC forums that he ran out of steppers. Oh well ? They're not easy to come by either.. Thanks for letting me know. Mark. Quote Link to comment Share on other sites More sharing options...
+skr Posted April 20, 2021 Share Posted April 20, 2021 20 minutes ago, DjayBee said: He recently wrote on the ABBUC forums that he ran out of steppers. That might be old news. Just ask him. Quote Link to comment Share on other sites More sharing options...
+Nezgar Posted April 20, 2021 Share Posted April 20, 2021 Hey all, @kbj's issue was resolved and it was a bad EPROM, not the stepper motor: https://atariage.com/forums/topic/317332-atari-1050-udn5713m-chips-question/?do=findComment&comment=4774778 Quote Link to comment Share on other sites More sharing options...
kbj Posted April 20, 2021 Share Posted April 20, 2021 1 minute ago, Nezgar said: Hey all, @kbj's issue was resolved and it was a bad EPROM, not the stepper motor: https://atariage.com/forums/topic/317332-atari-1050-udn5713m-chips-question/?do=findComment&comment=4774778 Hey @Nezgar It was a broken FDC chip, bad tacho wire from the motor and I replaced the EPROM too as part of the repair as I wasn't sure of it. Ta, Mark. 2 Quote Link to comment Share on other sites More sharing options...
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