Posts by blark

Caution: Non registered users only see threads and messages in the currently selected language, which is determined by their browser. Please create an account and log in to see all content by default. This is a limitation of the forum software.


Also users that are not logged in can not create new threads. This is a, unfortunately needed, counter measure against spam. Please create an account and log in to start new threads.

Don't Panic. Please wash hands.

  • ACA500plus black screen

    I don't see any pots on the RPT-60B board for adjustment, I've ordered a RT-65B it should be here tomorrow.


    Just so we're clear, how many micro farads is "huge?"


    I have an oscilloscope too, so if necessary I can get accurate readings to completely rule out the power supply as the issue... more to come tomorrow. Thank you again for the help.

  • ACA500plus black screen

    Quote from Jens

    That would be the destructive way - I think I've already gone a more community-like route by contacting the vendor and making him aware that he's putting classic computers at risk.

    Well considering they are still selling those power supplies (as I just bought mine) it seems like they are ignoring you. Hopefully anyone looking for power supply advice will happen across this thread...


    Also, consider just listing "approved" supplies. I wasn't suggesting a blacklist.

  • ACA500plus black screen

    Quote from Jens

    The RT-65B Chassis is about the only descent PSU I'Ve seen lately, but on the downside, the ripple specification has been increased about a year ago (so higher ripple on the same chassis number). The PDF in your link shows 80mV p-p for ripple, which should be fine (although larger than 1%). It used to be 50mV, so if you can get the older version, that would be even better.


    Please note that I can only endorse using this chassis for people who have the proper education working on mains voltage. Serious injury or death may occur if you make a mistake. If you don't feel fit for such a modification, please get help from a properly educated person.

    Thanks again Jens. I've been working with electronics and AC electricity for years, I'll be around to bug you if the upgraded power supply doesn't work ;)


    I'm surprised that the Amiga power supply that I purchased isn't suitable, could you put a warning on the Wiki page regarding using an appropriate power supply? It could help others in my situation avoid some hassle and headache.

  • ACA500plus black screen

    Jens thanks. I have no option to use the original PSU as the Amiga I have is from EU and I'm in NA. I don't have a 110>220 transformer.


    I will search for a power source that is properly regulated. Can you be more specific about modifying the secondary electrolytic caps? Is there an article somewhere I could read up on?


    Edit


    What are your thoughts on the Meanwell RT-65B (datasheet here). It seems to have the necessary outputs along with more than enough current, and is affordable.

  • ACA500plus black screen

    As I said in the first message, I already cleaned the contacts. Twice in fact. Once with an eraser as the manual says explicitly to do, and another time with 99% isopropyl alcohol. This didn't change anything.


    Edit:


    In case this helps in troubleshooting, the board cycles through the following numbers:

    - LED is blue, startup animation

    - 00

    - 05

    - 06

    - 20 (hangs for 20 seconds),

    - LED turns white and display changes to 8.8 screen goes black (tried two different screens)


    Lastly, just in case this question comes up. I bought and am using the following Amiga power supply from C64PSU.


    Thanks

  • ACA500plus black screen

    Hi there,


    I am having trouble getting my Amiga 500 to boot after installing the ACA500plus.


    Note: I also have an Indivision installed for VGA output and I believe this is a v1 Amiga 500. I removed the memory expansion and cleaned the board edge connector.


    The display on the card along with a blue LED turn on, the 7-segment DisMo display then cycles through a few numbers while the VGA display is green then stops at 20 for a while. After that the blue LED goes white, DisMo reads 8.8 and the screen goes black. The power LED does not light up.


    When I unplug the ACA500Plus the computer boots fine to the workbench disk screen and the red power LED lights up.


    Please help! =O Thank you very much.