ImportantBet
Grand Master
Sharp X1 Twin PicoPSU PCB
- Thread starter ImportantBet
- Start date
NFGx
Grand Master
I suppose I'd better replace mine before I fire it up and discover it's on fire, or worse. Do you have a cost estimate?
3rdman
Beginner
I bought my X1 Twin completely dead a couple of years ago and faced with having to replace the PSU. I bought a standalone power supply that provided +12v and +5v as well as the other things required of the system (+5VSB and switch signal) to get it up and running. I ended up with the following pinout...
X1 Side - PSU Side (fed from ATX power supply)
Red = +5V (Red wire on the ATX Connector)
Black = Ground (Black)
White = +5VSB (Purple)
Purple = power on (Green)
I forgot which PSU I got but it fit into the space the old one left behind making it a very clean installation. In any case, it would be wonderful if someone here can verify the voltages on a working machine. I've had a gnawing feeling that I've got something wrong and confirmation of the above would put me at ease. Having said that, the system does work 100% but for a very strange graphical glitch that occurs ONLY when LOADING games on "SYNC A" set. I don't want to get into it too much here but if I load a game into memory in "SYNC A" mode, it will play back with corrupted graphics. If I load the game instead with "SYNC B" set, the graphics are perfect and remain so if I switch between modes....VERY weird.
X1 Side - PSU Side (fed from ATX power supply)
Red = +5V (Red wire on the ATX Connector)
Black = Ground (Black)
White = +5VSB (Purple)
Purple = power on (Green)
I forgot which PSU I got but it fit into the space the old one left behind making it a very clean installation. In any case, it would be wonderful if someone here can verify the voltages on a working machine. I've had a gnawing feeling that I've got something wrong and confirmation of the above would put me at ease. Having said that, the system does work 100% but for a very strange graphical glitch that occurs ONLY when LOADING games on "SYNC A" set. I don't want to get into it too much here but if I load a game into memory in "SYNC A" mode, it will play back with corrupted graphics. If I load the game instead with "SYNC B" set, the graphics are perfect and remain so if I switch between modes....VERY weird.
Cyothevile
Student
As of November is there any progress on this project? I also own an X1 Twin, but mine works fine after restoring it.
I've done a few high-voltage designs with some being public. Did you need any help?
I've done a few high-voltage designs with some being public. Did you need any help?
Cyothevile
Student
What is the power rating of the computer? Should say something like 39W or something like that on the dataplate?
Cyothevile
Student
Look into using just this instead. Way cheaper than adding a pico.
https://www.mouser.com/ProductDetail/MEAN-WELL/EPS-45-5?qs=WtedIhRlNpsUmYZJ22PF2A==
https://www.mouser.com/ProductDetail/MEAN-WELL/EPS-45-5?qs=WtedIhRlNpsUmYZJ22PF2A==
As the X68000 these PSU are almost all fixable, the only times I wasn't able to do so were when the transformer was dead.
But it need some time, you have to replace most of the components (small resistors, transistor, diodes, optocoupler) and obviously chemical capacitors.
At least, you'll keep this computer in it's original state. I'm not favorable to replace the PSU on these old computers, let us keep them as original as possible.
But it need some time, you have to replace most of the components (small resistors, transistor, diodes, optocoupler) and obviously chemical capacitors.
At least, you'll keep this computer in it's original state. I'm not favorable to replace the PSU on these old computers, let us keep them as original as possible.
Cyothevile
Student
Not everybody has analog circuit knowledge to diagnose and repair these power supplies. What about instances where diodes fail and there are no markings on them? Most people don't know what to do outside of changing capacitors.
I bet 90% of this forum that "repairs" arcades or computer items will not know what to do outside of changing capacitors. Guarantee it. Hence the desire for projects like this. This is not meant to be a disparaging remark; it is just the reality of why "replace power supply" projects begin.