Vbruno305 Posted May 29, 2022 Share Posted May 29, 2022 My 400 that I got a few years back and never turned on until now only displays a green screen. Is there a AV mod or fix for this. I have an aftermarket PS for it could that be the issue? Quote Link to comment Share on other sites More sharing options...
TGB1718 Posted May 29, 2022 Share Posted May 29, 2022 What type of aftermarket PSU have you used ? The 400 needs a 9AC PSU around 15Watts Quote Link to comment Share on other sites More sharing options...
Vbruno305 Posted May 29, 2022 Author Share Posted May 29, 2022 Spoiler Spoiler Spoiler Spoiler This one. T POWER Compatible with 9VAC AC-ONLY: Atari CO17945 400, 800, 810, 850, 1010, 1050, 1200XL Replacement AC Adapter Switching Power Supply Cord Charger https://www.amazon.com/dp/B077PFTXGR/ref=cm_sw_r_apan_i_9Q09V7ZVY64HDA5MCY9G?_encoding=UTF8&psc=1 Quote Link to comment Share on other sites More sharing options...
TGB1718 Posted May 29, 2022 Share Posted May 29, 2022 That product is a little confusing i.e. t-power für 9 VAC AC Atari co17945 400, 800, 810, 850, 1010, 1050, 1200 x l Ersatz AC DC Adapter Schaltnetzteil Kordel Ladegerät Highlighted "AC DC Adaptor" although the picture shows an AC output. If it's really giving a DC output then it won't work, can you measure the output on the socket ? I also notice it doesn't give the output wattage. Quote Link to comment Share on other sites More sharing options...
Vbruno305 Posted May 29, 2022 Author Share Posted May 29, 2022 Spoiler Spoiler Spoiler Spoiler So based on the conversation calculator VxA=Watts fo 9vac 1amp is 9 watts so its probably low This one. T POWER Compatible with 9VAC AC-ONLY: Atari CO17945 400, 800, 810, 850, 1010, 1050, 1200XL Replacement AC Adapter Switching Power Supply Cord Charger https://www.amazon.com/dp/B077PFTXGR/ref=cm_sw_r_apan_i_9Q09V7ZVY64HDA5MCY9G?_encoding=UTF8&psc=1 Quote Link to comment Share on other sites More sharing options...
Vbruno305 Posted May 29, 2022 Author Share Posted May 29, 2022 VoltxAmps=Watts so it 9watts Also I do not know who to test for AC vs DC volts using a multimeter Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted May 29, 2022 Share Posted May 29, 2022 I would not trust that supply, the listing and pictures do not match and it warns you to watch the adapter for overheating lest bad things happen... insane that it's even being presented or sold in this fashion... 1 Quote Link to comment Share on other sites More sharing options...
TGB1718 Posted May 29, 2022 Share Posted May 29, 2022 1 hour ago, Vbruno305 said: VoltxAmps=Watts so it 9watts No, that's the input current it says Input :110-140VAC 50/60Hz 1.0 Amps Max Output: 9V~12V It does not specify an output current, nor does is say it's AC even though on the picture it does say AC/AC Adaptor, the actual description says AC/DC just as @_The Doctor__ says and I highlighted earlier If it was 9 watts, that's not enough for a 400. Please be careful until your sure what you have as it may cause damage (hopefully it hasn't done any harm yet) Quote Link to comment Share on other sites More sharing options...
manterola Posted May 29, 2022 Share Posted May 29, 2022 3 hours ago, Vbruno305 said: VoltxAmps=Watts so it 9watts Also I do not know who to test for AC vs DC volts using a multimeter If you set the multitester to DC and measure some significant voltage, then it is a DC power supply. A correct AC output power supply should show close to zero DC voltage, and if you set the multitester to AC voltage mode you should read 10v or more. 1 Quote Link to comment Share on other sites More sharing options...
Vbruno305 Posted May 29, 2022 Author Share Posted May 29, 2022 The description does not say anywhere in there that it is AC-DC but it does say 9-12 V in the pic. That being said could it just be that it is under powered? Quote Link to comment Share on other sites More sharing options...
machf Posted May 29, 2022 Share Posted May 29, 2022 (edited) Both the picture and the description say its output is AC... "AC/AC Adapter" in the photo and "9V AC" in the description. In theory, it should work... Unfortunately, it doesn't say how many Amps the output provides, so, yes, it could be insufficient to power the 400, which may need 1.5A Otherwise, if the power supply is fine, when was the last time you had that 400 working? Or maybe it never worked since you got it? Edited May 29, 2022 by machf Quote Link to comment Share on other sites More sharing options...
Vbruno305 Posted May 29, 2022 Author Share Posted May 29, 2022 I bought it about 6 years ago and didnt have a ps so it sat in a tub while I worked on other projects. I really didnt want it but since I haven't gotten an XL or XE I decided to get a PS for it. So lets take the PS out of the equation what else can it be or is there an AV mod that may bypass this issue? Also where can I get a good PS for it, Best Electronics? Quote Link to comment Share on other sites More sharing options...
machf Posted May 30, 2022 Share Posted May 30, 2022 The 400 should use the same power supply as the disk drives... anywhere you can get a power supply for Atari disk drives it should work. BTW, I noticed the "official" Atari ones have like 9V/3.5A output (that's 31.5W). And looking at the 400/800 Field Service manual, page 5-6 (that's the actual page number, not "pages 5 to 6", BTW), if all you get on power-up is a green screen, you should try swapping out RAM and ROM cards until you identify the damaged one... yes, unfortunately that's a symptom for a damaged RAM or ROM card. Quote Link to comment Share on other sites More sharing options...
TGB1718 Posted May 30, 2022 Share Posted May 30, 2022 11 hours ago, Vbruno305 said: The description does not say anywhere in there that it is AC-DC but it does say 9-12 V in the pic. That being said could it just be that it is under powered? Yes it does ---------------------------------->>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> HERE t-power für 9 VAC AC Atari co17945 400, 800, 810, 850, 1010, 1050, 1200 x l Ersatz AC DC Adapter Schaltnetzteil Kordel Ladegerät Quote Link to comment Share on other sites More sharing options...
Vbruno305 Posted May 30, 2022 Author Share Posted May 30, 2022 not sure what you are looking at but on the Amazon ad that I attached it does not say AC DC, is that German? Quote Link to comment Share on other sites More sharing options...
TGB1718 Posted May 30, 2022 Share Posted May 30, 2022 1 hour ago, Vbruno305 said: not sure what you are looking at but on the Amazon ad that I attached it does not say AC DC, is that German? This is where your link takes me and the description definitely says (after Google Translate) before translate it's as I posted in #14 above Replacement AC DC Adapter Switching Power Cord Charger It really does say it's a switching Adaptor, AC PSU's are not switching, I guess the seller has no real idea of what he's selling and maybe it is an AC PSU, but it's really not a good way to sell your goods, he should at least have a minimal understanding of what he's selling. Really only trying to protect you/your equipment https://www.amazon.com/dp/B077PFTXGR/ref=cm_sw_r_apan_i_9Q09V7ZVY64HDA5MCY9G?_encoding=UTF8&psc=1 Quote Link to comment Share on other sites More sharing options...
Vbruno305 Posted May 30, 2022 Author Share Posted May 30, 2022 I understand that..but the screen shot is from the link in last message is straight from Amazon where I bought it...I was just trying to understand where you got the ac dc from... someone else responded that the green screen is a problem woth the ram or rom card....i do appreciate the advice Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted May 30, 2022 Share Posted May 30, 2022 (edited) operating a computer in brown out conditions cooks chips. People went and read as well as looked at all the pictures from the links provided and have serious concerns about the supply. The information gathered does not inspire confidence. It would be simple for you to check the supply with a digital multi meter (DMM) etc. to make sure it is the correct supply under load. There is no point in troubleshooting a machine if the power supply will possibly be doing damage to whatever you are fixing. Edited May 30, 2022 by _The Doctor__ Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted May 30, 2022 Share Posted May 30, 2022 The picture you posted clearly shows tip polarity, it states conflicting data in the picture vs the description and furthermore the description conflicts with the specs... nothing is in agreement !!! If you only see the part you want to see, Your' giants are probably windmills! Quote Link to comment Share on other sites More sharing options...
Vbruno305 Posted May 30, 2022 Author Share Posted May 30, 2022 Tested the supply and its putting out 11.2vac so its over powered. So i guess i will need a proper Atari power supply Quote Link to comment Share on other sites More sharing options...
gilsaluki Posted May 30, 2022 Share Posted May 30, 2022 I am using this PSU from Amazon on my Atari 800. It works perfectly. https://www.amazon.com/dp/B00B886CWS?psc=1&ref=ppx_yo2ov_dt_b_product_details Quote Link to comment Share on other sites More sharing options...
Vbruno305 Posted May 30, 2022 Author Share Posted May 30, 2022 Bought! I hope this is the issue Quote Link to comment Share on other sites More sharing options...
gilsaluki Posted May 30, 2022 Share Posted May 30, 2022 2 minutes ago, Vbruno305 said: Bought! I hope this is the issue Read the specs. Read the reviews. Commodore guys are using them as well. Reliapro is a trusted name in PSUs. Quote Link to comment Share on other sites More sharing options...
manterola Posted May 30, 2022 Share Posted May 30, 2022 (edited) 11.2vac should be okay. Remember that's the voltage without load. Now that you are sure it is an AC power supply, you need to measure the voltage under load i.e. with the Atari 400 connected. Anyway, I guess you already got a new PS Edited May 30, 2022 by manterola Quote Link to comment Share on other sites More sharing options...
Vbruno305 Posted May 30, 2022 Author Share Posted May 30, 2022 Yes...but its Amazon if ot doesnt do it ill send it back for my $13...got to love the return policy Quote Link to comment Share on other sites More sharing options...
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