Jamma +5V

Stokers

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I've turned my Astro City on for the first time, the monitor and marquee light comes on..nice.

I've tried to check the +5v using a multimeter on the right pins with no board attached, and i'm getting no reading, i've read you need to test the board under load??- but can you safely plug in a CPS2 game and turn it on without knowing what the voltage is set to?

Ok..update .. which way round does the Jamma edge go..
smiley9.gif


I was testing voltages from Pin 1 on the left with the connector this way round..



But if I flip it over I get 5.1 V so I guess i'm a moron?



lancer 0 60

Stokers2023-01-12 12:18:44
 
Lurch666

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On your jamma connector the side with writing on it is the top.

In the orientation of the top picture the rightmost two pins are GND then next two pins are +5V then you have a single -5v pin then a single +12V pin.

If unsure look for the two pairs of pins connected together on a jamma connector,they will be GND and +5V with a single pair of joined pins on the opposite side that's GND again.

If you have a pot that adjusts voltage on your PSU turn it all the way down then test with a PCB then you will know the +5V will not be over 5V.
 
Stokers

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Thanks guys.

https://streamable.com/umllm3

It's working nicely at the moment .. although the new control panel has vertically orientated lugs for the a mounting plate. However if you install the sticks vertically, the controls are all rotated 90 degrees, so right is down etc.

Removing the mounting plate from the actual stick is nearly impossible as the screws are glued in! not sure what to do about that :D

Stokers2023-01-12 13:28:54
 
Stokers

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big10p said:
Just undo the 4 mounting plate screws and roate the plate 90 degrees... unless I'm misunderstanding what you mean.
Click to expand...

Yeah those screws are glued in, so you need to heat up the glue to break them. I found another solution however - you can take off the bottom clip on plastic and rotate the micro switches. So my sticks are working now.

Only issue left is the kick harness isn't working :(
 
Flinnster

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Ok..update .. which way round does the Jamma edge go..
smiley9.gif


The thick sets of doubled up pins are always 1&2, 3&4 on the connector (GND, 5v) and should go on the right hand side of the pcb edge fingers if you are facing looking into the cab with the pcb edge fingers on the side furthest away from you.
Don't always rely on the printing/numbers on the edge connector, it may have been wired in upside down.

However if you install the sticks vertically, the controls are all rotated 90 degrees, so right is down etc.

Yeah, just pop the pins out with a small jeweler's screwdriver.
 
Stokers

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Flinnster said:

Ok..update .. which way round does the Jamma edge go..
smiley9.gif


The thick sets of doubled up pins are always 1&2, 3&4 on the connector (GND, 5v) and should go on the right hand side of the pcb edge fingers if you are facing looking into the cab with the pcb edge fingers on the side furthest away from you.
Don't always rely on the printing/numbers on the edge connector, it may have been wired in upside down.

However if you install the sticks vertically, the controls are all rotated 90 degrees, so right is down etc.

Yeah, just pop the pins out with a small jeweler's screwdriver.
Click to expand...

Yes - I had it the right way up but I was reading the pinout wrong. I thought pin 1 would start from the left hand side of the edge connector, when I flipped it over I got the 5.1 V reading, which was the wrong way but I was at leat testing the right pins. A bit of trail and error and I got it working.
 
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