Problem Arcade Power Supply to a 24pin power input Supergun.

[daeds]

Hello there,
As the title indicates, I'm having some issues with the ATX power supplies that my supergun board asks for as I need to regulated the 5v rail a bit and they won't let me,
This is my actual supergun:

How can I use a normal arcade PSU on this thing?
I've been wondering if I can just take the damned 5 volt cables from the connector and solder all the 5v from the arcade PSU to the edge connector or even the 24pin, or even forget the 24 pin connector and solder the cables from the arcade PSU directly to the edge connector (is that even possible?).
Looking forward for your feedback on this matter,
Thanks a lot once again everyone!

 

[Georgian2]

Many power supply have inside an voltage adjust pot. I did add one on some models.
You culd just cut the wires and connect them to an other power supply.
5V should be red,
+12V Yellow
GND Black
PSON Green (Connects to GND to turn the PSU on)

3v3 Orange (not needed)

Some powersupply have -12V only, some have -5V too. If there is no -5V I usen an 7905 voltage regulator on the -12V line. Weak solution but it works for me.

Check the datasheet or legen on the power supply for the exact colors.

 

[daeds]

Many power supply have inside an voltage adjust pot. I did add one on some models.
You culd just cut the wires and connect them to an other power supply.
5V should be red,
+12V Yellow
GND Black
PSON Green (Connects to GND to turn the PSU on)

3v3 Orange (not needed)

Some powersupply have -12V only, some have -5V too. If there is no -5V I usen an 7905 voltage regulator on the -12V line. Weak solution but it works for me.

Check the datasheet or legen on the power supply for the exact colors.

Both of the ones I have don't have any pot.
What are my options to connect a normal variable PSU to this 24pin?
Thanks!

 

[Georgian2]

Cut the cables long enough but not too long. Connect the coresponding colors to your new PSU. Check the label for colors. You need +5V (red) +12V (yellow) GND (black) -5V (usualy white or blue). The colors may differe. Check the label.
If you go down this route, make use of all the cables with same color. For example use all red for +5V.

 

[daeds]

Cut the cables long enough but not too long. Connect the coresponding colors to your new PSU. Check the label for colors. You need +5V (red) +12V (yellow) GND (black) -5V (usualy white or blue). The colors may differe. Check the label.
If you go down this route, make use of all the cables with same color. For example use all red for +5V.

Oh, the rest I can just ignore and get them out? Hopefully the on and off switch of the SG is independent of the other cables that come from the 24pin.

 

[Georgian2]

On/off switch is usually connected on the green PSON cable and GND.
Make sure you double check the colors and check witch the jamma pinout for continuity in order to match the voltages.

 

[Georgian2]

https://www.smpspowersupply.com/connectors-pinouts.html Here is an pinout for that connector. Hope it helps.

 

[daeds]

On/off switch is usually connected on the green PSON cable and GND.
Make sure you double check the colors and check witch the jamma pinout for continuity in order to match the voltages.

The PSON cable, how could I connect it to the "normal" arcade supply? Sorry for so many questions.

 

[Georgian2]

The PSON cable, how could I connect it to the "normal" arcade supply? Sorry for so many questions.

You can't use that on an normal arcade power supply. It will be on as soon as you plug it in.

 

[daeds]

You can't use that on an normal arcade power supply. It will be on as soon as you plug it in.

So basically here in the 20 pin connector I'll use every +12v, +5v, -5v and GND and connect those to the same stuff on the arcade supply, am I right?

The rest of the cables I can get them out of the connector so I don't have both PSUs connected to the same supergun?
Thanks a lot!

 

[Georgian2]

Yes. Afeter youvare done, post aome pictures. Turn it on without an pcb connected and make sure everything is right on the jamma connector.
Better to take your time than breaking an game pcb.

 

[daeds]

Yes. Afeter youvare done, post aome pictures. Turn it on without an pcb connected and make sure everything is right on the jamma connector.
Better to take your time than breaking an game pcb.

Thank you! Will do, I bought a Mean Well psu and that should arrive somewhere this week.

 

[Jacmar]

This is how I did mine

 

[daeds]

This is how I did mine

View attachment 44607

Awesome, so basically you cut the necessary cables from the ATX PSU and cramped the fork on them and directly to the arcade PSU they go (I have no crimping tool )
You connected the COM to ground, right?
The rest of the cables are connected somewhere, @Jacmar ?

 

[Jacmar]

The rest of the cables are not connected to anything, just hanging over the other sider of the PSU, I've just not bothered removing them, just put some shrink tube over the ends. A crimp set is really useful if you're planning on doing other repairs, I got the someline kit from Amazon it's been more than adequate

 

[daeds]

The rest of the cables are not connected to anything, just hanging over the other sider of the PSU, I've just not bothered removing them, just put some shrink tube over the ends. A crimp set is really useful if you're planning on doing other repairs, I got the someline kit from Amazon it's been more than adequate

Going to try this way when the MeanWell psu arrives, it's of great quality, right? It was recommended by the store, anyways should be leagues ahead of this shady no brand ATX psu I have.
What gauge do you recommend for the power cabling? Seems to be 18g what's coming out of the PSU.
Thanks a lot!
Edit1: @Jacmar I see that your Supergun has a on/off switch aswell, does it work with the connector just with some cables?

 

[daeds]

Well, I received it today and:
It was a pain to get all the grounds in the screw:

But I worked it out and here it is, ready to test all the voltages before frying up my lovely boards:

Well, it works as it should but has no sound, I see that the connector delivers 12v to the board but the Supergun board won't deliver it to the 12v pin, Toki sprite problem is solved with a bit more 5v juice as I suspected!:


Now, a jumper was made from the 12v pin on the connector to the 12v pin on the edge connector, sound is back!:


As it's done everyone, thanks for all the help, really, a big thanks!
I can now enjoy Toki and drink a pint!
Hope this post helps someone in the future!

 

[Georgian2]

I cannot see where did you connect the 12v cable on your new power supply. That white and blue cable are either for -5V and -12V.....
The connections look quite messy and bad. Are they tight?

 

[daeds]

I cannot see where did you connect the 12v cable on your new power supply. That white and blue cable are either for -5V and -12V.....
The connections look quite messy and bad. Are they tight?

Yep, a bit messy indeed, needed the crimping tool and ordered the darned big forks by mistake , but tight and the voltages are stable. Will check that!
Edit1: I got the 12v on the +2v port of the PSU. So that's the blue cable, maybe that's why it won't get 12v...

 

[Georgian2]

No, man. Yellow should be +12V. Blue is -12V (negative 12V).