JAMMA issues with AWSD - FIXED

[TJB]

EDIT 28/05/16

Problem was a Transformer outputting too high a voltage for the P271, I have replaced it with a more accurate Transformer and all symptoms are gone now, thanks!

So I picked up an atomiswave SD recently in pretty tip top condition but I'm having some issues running anything JAMMA through it, here's a video of my F3 running Puzzle Bubble 4. Worth noting is the lack of sound as well.

https://www.youtube.com/watch?v=tsI34fL-7T8

Esp.ra.de = Sound cuts in/out, can't catch the vertical sync properly.
Mushihimetama = Picture is extremely overexposed, turning down contrast does not fix this (although it does lower the brightness and all that).

The games themselves work just fine on my other cabinet, so it's not the boards right?

I've asked the fella I got the cabinet off and he reckons it's the possible lack of a video ground on pin 14 of the harness is the culprit, but I thought I'd run it by you lads. Took a look at the harness and sure enough I don't think I see a pin 14, I'll post a photo of the harness soon if it's of any help.

I'd also like to add that I have no idea what I'm doing, my knowledge of electronics is laughable, I can solder though! (and yes I am making an effort to fix this as of late).

[TJB]

Had some time to sit down and scratch my head for a bit.

Harness
http://i.imgur.com/HVLNmIu.jpg
http://i.imgur.com/hw4F7LU.jpg

Inside
http://i.imgur.com/oxPXYR5.jpg

PSU is the (as expected) infamous P271, that said, all the leds light up as expected. I don't have the means of measuring the voltages as of yet, but I will soon.

Some things worth noting.

Esp.ra.de = Sound begun to work fine after a few minutes, strangely enough, after I degaussed the monitor. I suspect it was more the result of me lowing the volume.
Mushihimetama = Lowering the contrast alllllllllll the way down appears to fix the blown-out picture, but that's not right... Is it?
F3 Motherboard = Same deal, no sound, pulsing (to the right) image as shown in the video above.

The place I bought the cabinet off aren't being too responsive at this point in time, and when they are they do a great job at not answering any of my questions.

Quick bit of info about the cab, as you can see from the inside shot. It has a PC connected to a JPAC, it's nice having this option but 70% of why I bought the cab was to also run PCB's inside of it.

I'm going to pick up a Multimeter and post my findings then.

[TJB]

Quick update.

It's definitely the PSU, I suspect it's the exact same thing noted here.

Blinking led on 12v, multimeter readings go apeshit, I'm tempted to hack apart the cabling and hook up a standard JAMMA PSU but I wouldn't have a clue where to begin, someone on AO has done it (they're probably a member here too) so I'd love to see how they did it.

As sore as I am, I had a lot of fun troubleshooting.

Until next time...

[PascalP]

What does your multimeter read on the 12V and 5V line?

[TJB]

What does your multimeter read on the 12V and 5V line?

I'll have to measure it again as I didn't note the exact figures, 5V was pretty damn close to 5V though. I couldn't get an accurate reading on the 12V while a game was running, it would jump from voltages as low as 2 to as high as 20.

I still need to measure the transformer to make sure the problem is the PSU not being given anything higher than ~105V.

I'll sit down tomorrow night and get some proper readings, unfortunately I didn't have much time to sit down tonight.

[PascalP]

Sound very bad if your voltage jumps to 20V!
I wouldn't connect those expensive PCB's if I where you.

First measure it with the cab turned ON but NO PCB connected, if the voltage jumps from 2-20V as you see, something is seriously wrong with your PSU

[TJB]

I should be asleep but curiosity got the better of me. I wanted to take a quick peek at the transformer, it outputs 115V according to the label. From what I understand, I want 105V at the absolute max if I'm going to stick to the P271. I don't know how to measure a stepdowns output though, I'm fairly new to this.

I measured from the harness with the cab on with no PCB connected, 12V gives me a steady 12.08V, 5V gives me steady 5.08V. The moment a game is connected it's obviously a very different story.

EDIT - Here's a video I snapped earlier of the blinking LED on the PSU while running the F3 Motherboard /w Puzzle Bobble in it.
https://www.youtube.com/watch?v=jzbbbZw_RdQ

[nem]

First measure it with the cab turned ON but NO PCB connected, if the voltage jumps from 2-20V as you see, something is seriously wrong with your PSU

Many PSUs will not show correct voltages if they're not under load. That's why you should always have something connected, preferably a cheap board.

12V usually powers sound amps, so that could explain why you're having issues with sound.

According to Wei-Ya spec sheet, the P271 is 85-115V, so you're OK with your AC voltage.

[PascalP]

First measure it with the cab turned ON but NO PCB connected, if the voltage jumps from 2-20V as you see, something is seriously wrong with your PSU

Many PSUs will not show correct voltages if they're not under load. That's why you should always have something connected, preferably a cheap board.

12V usually powers sound amps, so that could explain why you're having issues with sound.

According to Wei-Ya spec sheet, the P271 is 85-115V, so you're OK with your AC voltage.

Agreed that a test under load is much better, but if the 12V without load would be all over the place (like the 2-20V he stated earlier), this would mean something in his PSU is really f*cked up.

Now take a cheap and confirmed working PCB and redo the measurement

[TJB]

Unfortunately I have no cheap boards ;_; Guess I should pick one or two up for testing purposes.

So I measured the transformer, it's outputting 123V further confirming my suspicions that this is simply just another case of the P271 being sensitive despite what the spec sheet tells us.

I guess at this point I either replace the PSU with a SWN-JVS-NA (or the Stepdown as well with a proper 100V one) or hack in a standard JAMMA PSU. I'm currently awaiting a response on the business who sold me this cabinet but I'll probably end up a few hundred poorer in the long run, I say this as hacking in a JAMMA PSU... I wouldn't have a clue where to begin, apparently Kernow's done it, but he's no longer a member here.

Thanks for the replies guys, I'll post again when there's been some kind of resolution.