homerj Posted February 18, 2023 Share Posted February 18, 2023 I bought a Retro-Bit Retrogen Genesis 2/3 AC adapter to use with my Game Gear. Turning it on, the only thing that happens is the screen flashes. This happens with or without a cartridge inserted. Did i get a faulty adapter, wrong model? Quote Link to comment Share on other sites More sharing options...
+Psionic Posted February 18, 2023 Share Posted February 18, 2023 Was the Game Gear known to work beforehand? The stock GG power supply (MK-2103) yields 10V DC / 0.85A / center +. Quote Link to comment Share on other sites More sharing options...
homerj Posted February 18, 2023 Author Share Posted February 18, 2023 Works fine with batteries. The Retrogen is 10v/500ma. Doesn’t say whether it’s center positive. Quote Link to comment Share on other sites More sharing options...
Lord_of_Sipan Posted February 18, 2023 Share Posted February 18, 2023 Genesis 2 power supply is center - I’m pretty sure. Quote Link to comment Share on other sites More sharing options...
Tanooki Posted February 19, 2023 Share Posted February 19, 2023 I've got a Game Gear on the desk next to me here, one I bought off a member on the site. I had the power supply for it because it works for the Nomad I also have. MK-2103 10v DC 0.85A and yes center positive.( If your system works fine on batteries, the adapter you got is probably bad, or not giving it enough being short by .350A if that should matter I don't know but it is low. Has the GG ever been recapped or otherwise modded? It could be looking for something a bit different and that cheapo modern adapter even if it's not defective may just not be cutting it. If I'm reading it right (-)--- (----(+) It's hard to see being small but it's open with a line on the right to the +, the - leads to the outer circle but doesn't go into it. Quote Link to comment Share on other sites More sharing options...
+Psionic Posted February 19, 2023 Share Posted February 19, 2023 8 hours ago, Lord_of_Sipan said: Genesis 2 power supply is center - I’m pretty sure. The Master System & original Genesis adapters are (-) but the Genesis 2 & 3 are (+). As stated above, the Game Gear and Nomad use the same one (MK-2103) as the Genesis 2. Quote Link to comment Share on other sites More sharing options...
Lord_of_Sipan Posted February 19, 2023 Share Posted February 19, 2023 (edited) 12 minutes ago, Psionic said: The Master System & original Genesis adapters are (-) but the Genesis 2 & 3 are (+). As stated above, the Game Gear and Nomad use the same one (MK-2103) as the Genesis 2. Ah that is right! I knew they switched from model 1 to 2, I got the direction of the switch backwards Edited February 19, 2023 by Lord_of_Sipan Quote Link to comment Share on other sites More sharing options...
homerj Posted February 19, 2023 Author Share Posted February 19, 2023 6 hours ago, Tanooki said: Has the GG ever been recapped or otherwise modded? It could be looking for something a bit different and that cheapo modern adapter even if it's not defective may just not be cutting it. It has been recapped. I’m wondering if that’s the case too. Maybe I’ll get my hands on an OEM power supply & see if that works. Quote Link to comment Share on other sites More sharing options...
Tanooki Posted February 19, 2023 Share Posted February 19, 2023 Well a re-cap would at least let you know it isn't failing on those grounds, but also would mean unless something else failed or was a bad new cap, you shouldn't be seeing some different draw as if you stuck a LCD in there or removed the blood sucking CFL either. It could really be the wrong rating on the power supply. The power brick for the GG+NOMAD+GEN model 2 is super easy and cheap to get like $10-15, check local before paying the weight of shipping. Quote Link to comment Share on other sites More sharing options...
DJ Clae Posted February 23, 2023 Share Posted February 23, 2023 Game Gear uses the same AC adapter as the Genesis 2 and Nomad. Quote Link to comment Share on other sites More sharing options...
homerj Posted February 24, 2023 Author Share Posted February 24, 2023 I bought a power supply with adjustable output & swappable tips. Works fine with the Game Gear. The 3rd party power supply i bought originally must be defective. 1 Quote Link to comment Share on other sites More sharing options...
CatPix Posted February 26, 2023 Share Posted February 26, 2023 (edited) On 2/23/2023 at 10:10 PM, DJ Clae said: Game Gear uses the same AC adapter as the Genesis 2 and Nomad. In the US apparently, elsewhere it use the Megadrive1/SMS form factor. So be careful when dealing with potentially imported GG. Edited February 26, 2023 by CatPix Quote Link to comment Share on other sites More sharing options...
+Psionic Posted February 27, 2023 Share Posted February 27, 2023 15 hours ago, CatPix said: In the US apparently, elsewhere it use the Megadrive1/SMS form factor. So be careful when dealing with potentially imported GG. The power jacks are different by design though, so plugging in the wrong one isn't possible under normal circumstances. Sega knew that people were idiots and might fry their console. 2 Quote Link to comment Share on other sites More sharing options...
CatPix Posted February 27, 2023 Share Posted February 27, 2023 Yes, in theory. You can't plug a model 1 power supply in a model 2 as the barrel diameter is different (enoguh for you to see it on the picture) but the only thing preventing to plug a model 2 psu into a model 1 is the diameter of the inner pin, and especially on aftermarket power supplies, the difference is much thinner and manufacturers tend to use the same design, so it is possible to do it. Not with every PSU (not with Sega originals at least) but I have done it with generic ones. Quote Link to comment Share on other sites More sharing options...
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