Wyluli Wolf Posted March 12, 2014 Share Posted March 12, 2014 I recently bought a model 1 Sega on eBay. Of course it was advertised as working and complete. Turns out it has a wonky joystick (I'm taking it apart to clean and hopefully this will resolve) and a wonky power connector. When I plug in the power supply and move the cord the power cuts off. The plug where the adapter goes into the system actually moves. I opened it up to see what was going on. On the model 1 system I have the power plug is a small circuit board that just sits on top of plastic. It's not soldered onto the system board like in later models. The solder joints looked ok to me (for what that is worth). The red and white wires run up to the power button on the front. I'm really not sure what to do to try and resolve the problem. It's definitely caused by the power port but I have no idea what is causing the short. Does anyone have any advice on what to try? I've seen lots of threads on the model 2 having issues and folks reflowing the solder, but those ports appear to be directly connected to the system board. Thanks. Quote Link to comment https://forums.atariage.com/topic/223091-sega-model-1-with-power-port-issue/ Share on other sites More sharing options...
Osgeld Posted March 12, 2014 Share Posted March 12, 2014 inside the plug itself is a leaf spring that makes contact with the outside of the connector, its probably squashed or broken Quote Link to comment https://forums.atariage.com/topic/223091-sega-model-1-with-power-port-issue/#findComment-2947061 Share on other sites More sharing options...
Wyluli Wolf Posted March 13, 2014 Author Share Posted March 13, 2014 I had a look and cleaned it with some rubbing alcohol. It doesn't appear to be broken or squashed as far as I can tell. It's odd as it cuts off when I move the power cable downward (towards that leaf spring). It's not as sensitive if I move the cable side to side. I pulled that little circuit board out and tried powering it up. The power stays on till you tap it in that one direction and POOF! no more power. Frustrating. Thanks. Quote Link to comment https://forums.atariage.com/topic/223091-sega-model-1-with-power-port-issue/#findComment-2947373 Share on other sites More sharing options...
Osgeld Posted March 13, 2014 Share Posted March 13, 2014 what about the springs inside the plug? its a similar setup with one or two leaf springs inside the middle part Quote Link to comment https://forums.atariage.com/topic/223091-sega-model-1-with-power-port-issue/#findComment-2947590 Share on other sites More sharing options...
Wyluli Wolf Posted March 14, 2014 Author Share Posted March 14, 2014 I think I'm going to try and de-solder the dc jack. This may prove difficult give how small the pcb is but I'll give it a go. If I manage to get it off I'll make a trip to Radio Shack and with any luck they will have one matching what I need. Hopefully a newly soldered dc jack will take care of the problem. Quote Link to comment https://forums.atariage.com/topic/223091-sega-model-1-with-power-port-issue/#findComment-2948039 Share on other sites More sharing options...
Austin Posted March 14, 2014 Share Posted March 14, 2014 Let me know how that works for you. I have a Master System with the exact same problem but wouldn't mind fixing it (versus tossing it or donating it to someone). Quote Link to comment https://forums.atariage.com/topic/223091-sega-model-1-with-power-port-issue/#findComment-2948083 Share on other sites More sharing options...
Wyluli Wolf Posted March 14, 2014 Author Share Posted March 14, 2014 Let me know how that works for you. I have a Master System with the exact same problem but wouldn't mind fixing it (versus tossing it or donating it to someone). Will do Quad. Keep your fingers crossed for me. If it works I'll post the details. If it doesn't, I'll come back and cry about it Quote Link to comment https://forums.atariage.com/topic/223091-sega-model-1-with-power-port-issue/#findComment-2948100 Share on other sites More sharing options...
Wyluli Wolf Posted March 15, 2014 Author Share Posted March 15, 2014 (edited) Right. So after much cursing, swearing, vulgar language, several finger burns, pleading, yanking, pulling and more cursing ... I was finally able to remove the DC power port connector. That thing was by far the most difficult de-soldering job I've ever attempted. The tiny circuit board made it hard to handle and no matter how much solder I sucked outta the thing it just would not budge. Then my solder sucker broke. Blasted thing! Went to radio shack and they did not have the exact part I needed. Had to hunt on eBay and found a good deal on a pack of 30 (not that I'll ever use that many, but hey). Now we play the waiting game till the port arrives. Hope this works..... Edited March 15, 2014 by Wyluli Wolf 1 Quote Link to comment https://forums.atariage.com/topic/223091-sega-model-1-with-power-port-issue/#findComment-2948680 Share on other sites More sharing options...
Darth Link Posted March 18, 2014 Share Posted March 18, 2014 (edited) Had a friend solder mine, his hands are better at precision work, that's pretty much all you can do, unless someone's discovered a better method. It's a very common problem with model ones. Edited March 18, 2014 by Darth Link Quote Link to comment https://forums.atariage.com/topic/223091-sega-model-1-with-power-port-issue/#findComment-2950627 Share on other sites More sharing options...
Wyluli Wolf Posted March 19, 2014 Author Share Posted March 19, 2014 Looks like the part should arrive today! Fingers crossed.... I'll post back later to let ya know if it was successful, or if I killed it completely. Send good vibes my way.... Quote Link to comment https://forums.atariage.com/topic/223091-sega-model-1-with-power-port-issue/#findComment-2951713 Share on other sites More sharing options...
Darth Link Posted March 19, 2014 Share Posted March 19, 2014 Good luck with all, man! Quote Link to comment https://forums.atariage.com/topic/223091-sega-model-1-with-power-port-issue/#findComment-2952042 Share on other sites More sharing options...
Austin Posted March 19, 2014 Share Posted March 19, 2014 Good luck! Quote Link to comment https://forums.atariage.com/topic/223091-sega-model-1-with-power-port-issue/#findComment-2952045 Share on other sites More sharing options...
Wyluli Wolf Posted March 20, 2014 Author Share Posted March 20, 2014 I think I am VICTORIOUS! I soldered in the new port, very cautiously plugged in the power cord...ready to run and grab the fire extinguisher at any moment. After jumping back I then hit the power button and "Walla!" It turned on! I then tinkered with the cord and she stayed on. I'll be darned, I'm sure glad that seems to have worked. After she has been thoroughly tested I'll be satisfied. Now I can focus on my C64 issues and possible PS1 issues... Oh well, I'm happy I fixed one! Quote Link to comment https://forums.atariage.com/topic/223091-sega-model-1-with-power-port-issue/#findComment-2952187 Share on other sites More sharing options...
Wyluli Wolf Posted March 20, 2014 Author Share Posted March 20, 2014 Let me know how that works for you. I have a Master System with the exact same problem but wouldn't mind fixing it (versus tossing it or donating it to someone). My guess is just softening up the solder and maybe adding some new solder may fix the issue. Give it a shot and let me know if it works for you. If you would like a new plug to solder in I can send you one. I have several as I could not find a good deal on buying just one! Quote Link to comment https://forums.atariage.com/topic/223091-sega-model-1-with-power-port-issue/#findComment-2952191 Share on other sites More sharing options...
Austin Posted March 20, 2014 Share Posted March 20, 2014 My guess is just softening up the solder and maybe adding some new solder may fix the issue. Give it a shot and let me know if it works for you. If you would like a new plug to solder in I can send you one. I have several as I could not find a good deal on buying just one! Yeah, I was thinking the same thing, maybe just de-soldering and then re-soldering it, or something like that. After 25+ years (in the case of my SMS), perhaps it's simply come loose. I may see about trying it soon and I'll get back to you on if I do need a replacement. 1 Quote Link to comment https://forums.atariage.com/topic/223091-sega-model-1-with-power-port-issue/#findComment-2952789 Share on other sites More sharing options...
Wyluli Wolf Posted March 21, 2014 Author Share Posted March 21, 2014 Yeah, I was thinking the same thing, maybe just de-soldering and then re-soldering it, or something like that. After 25+ years (in the case of my SMS), perhaps it's simply come loose. I may see about trying it soon and I'll get back to you on if I do need a replacement. Sounds good. Let us know if you are successful! Quote Link to comment https://forums.atariage.com/topic/223091-sega-model-1-with-power-port-issue/#findComment-2952908 Share on other sites More sharing options...
Like us on Facebook
Follow us on Twitter
AtariAge on Instagram
Watch us on YouTube
Chat on Discord
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.