Help me with my Jamma Cabinet

[lettuce]

Hi all, am new to the forums and require some assistance. Have just purchased the following Jamma cabinet,



I am looking at converting it to house a PC running MAME. I shall be using a J-PAC and ArcadeVGA card to use the controls and the Monitor. Where im stuck is, im not sure what componets inside the Jamma case i need to remove and which i need to keep. I understand that u need to remove the power supply of the cabinet, leaving just the monitor isolating transformer??? Im just having trouble identifying whats what inside the cab. Heres some pic of the inside ,


I think it might be one of those Jamma Plus cabinets, cos it has 6 buttons wired, just cant work out where the extra wires are connected to. Does the monitor draw its power from the J-PAC when its fitted? Just would be really helpful if someone knew of a web site that had a guide to converting a Jamma cab over to a mame one

[RayB]

There's plenty of info on these boards. So do lots of reading before you start...

The blue box is the power supply.

The big massive heavy looking block thing is the Isolation transformer. This is what the monitor gets power from. You need to keep this.

The blue connector is of course your harness. You might want to find a JAMMA pin-out schematic online and compare to your connector and make sure that it is in fact JAMMA. (Probably is, but it would damage your parts if it turned out not to be jamma)

All you really need to do is "unpower" the switching power supply. You don't have to physically remove it. Just be "safe" with how you disconnect it, making sure no live wires are left dangling around in the bottom, etc...

[lettuce]

Thanks for the reply Ray, yeah it is a jamma, its got the pin outs on a sticker inside the cab, but the extra buttons on the control panel dont seem to be conect to the jamma connection, which i cant understand where there wired to. Could you tell me what the blue and red circled componets are in the picture below


and the same for this circuit board, also notice theres what i think is a 12 pin plug with nothing attached, and have jumper switches at the base of the circuit board


So could i complete remove the blue

[AlanS17]

The JAMMA standard only support 3 buttons per player and JAMMA+ supports 4. If you have extra buttons (more than 3 per player) that don't lead to anywhere, it's because they don't fit into the JAMMA harness. They plugged directly into the game's PCB.

In the top picture, the red circle is the isolation transformer for the monitor. You have to keep that. I can't tell what's circled in blue because there's just too much other stuff in the way (including a blue circle) but it's probably a fuse block. If it's wired into the isolation transformer, you'll need to keep that too.

In the bottom picture, the red circle looks like some some sort of connector (obviously) but it's not possible to say what it's connected to without following the wires. Is it plugged in? I can't tell. I would say the blue circle is the PCB except it looks pretty small for that. Perhaps it's an auxillary board like an audio board or something. It's chopped off, though. Can't really tell.

You're going to need better pictures if people are going to be able to see what you've got in that second picture.

And you can completely remove the blue power supply from the machine to make space. Just make sure the power to the monitor isn't bridging across the AC contacts on the power supply. If so, you can easily bypass the power supply, but you can't simply just unplug everything. I can give a better explanation if that didn't make much sense.

[Goz]

Depending on what boardset is in the JAMMA cab. It could have a kick harness like CPS to make 6 buttons work in a JAMMA cab.

-Goz

[lettuce]

If you could give a better explanation Alan that would be great, heres some more close up pictures


and the unknow circuit broad, the wires you see running down the right side of the broad are not connected to anything they are just cable tied up!

[RayB]

Alan's comments were wrong...!
In your most recent photo... the BIG thing is the Isolation Transformer, and as I already said, the monitor is powered through that!

The part that says 5a, 2a, etc are FUSES. (Lift up the cardboard while you have the power off and you will see 3 fuses).

The small silver box is an AC power filter. It ensures that voltage is "clean" and doesn't have interference / noise on it.

The power switch.... Is a power switch.   

The board though is a mystery. I am tempted to say it's an audio board or amp. Can you trace the wires off it and ensure NONE are connected? None going to the speakers? I don't know what it is. It's not a standard JAMMA part, which means you can chuck it. You don't need it.

~Ray

[lettuce]

I think the wires do go to the speakers, ill have to double check tomorrow, there are 3 speakers in the cab in total left, right, and one placed in a box, much like a sub i guess!

So i can remove the Fuses box, and the power supply, and keep the rest in? If i remove the power supply where does the iso transformer draw its power from?, is it wired straight to the wire that goes to the plug that plugs into the wall socket?

As looking at this picture,



it looks like the power supply is only connected via the 12v, -5v, gnd, gnd, 5v, FG, AC, AC wires, i cant see any wires going in to the power supply to actually power it. I'll have to have a good look tomorrow!

[lettuce]

Is there only surpossed to be one cable from the ISO transfomer going to the monitor??? As i have followed the wires from the ISO transfomer and the only one that seems to go off to the monitor is the wire labeled 0 v?? Ive draw a rough diagram



As you can see on the right had side of the ISO trans, the black wired that is labeled 0 V, seems to head off to the monitor, the other black wire labeled 120 v goes to the terminal marked 3A on the fuse box, the 120 v terminal isnt wired to anything. On the left hand side of the ISO trans, the Blue wire labeled 0v, does to the top left terminal of the AC Power Filter. The brown wire goes to the Power supply (which ive removed completely) terminal labeled AC. THe 220 v terminal isnt wired to anything.

So is this all right? Can i remove all the other wires from the ISO Transfomer apart from the wire that does to the monitor, or do i have to keep all the other wires attached to where they go? As i though i could completely remove every thing apart from the ISO transfomer?

I also notice that there was a Blue, yellow, black, and 2 red wires that were attached to the Power supply that go up the back of the cabinet somewhere, are these wires for the coin mech? As now they are not attach to the power supply anymore, their nothing to do with the monitor are they? This is how these wires where attached to the power supply

Blue -----

[lettuce]

Anybody?

[lettuce]

Help 

[RayB]

OK Listen, if you can't trace wires from power to components, then do it backwards. Look at all wires coming off the monitor and see where they go.

You should find 5, maybe 6 of them going to the jamma harness (red, green, blue, sync and ground). Then there should be slightly thicker wires for power. 2 of them. 1 is the voltage, the other is ground. See where these go. It's entirely possible that you have a newer monitor that doesn't even need iso transformer. On the other hand, maybe someone wired it so the main power line comes off the ISO, but the ground goes elsewhere (electrically this works, but is probably NOT the correct way to have it wired for safety reasons.)

[lettuce]

Thanks for the reply Ray, i found out that the AC wires run all the way down the cab to the right side of the ISO transformers, on the left side theres a blue and brown wire attached to the iso tran, these go to a switch terminal right at the front of the case (guess for truning the machine of with ease when changing a game board) then out of the switch to the fuses, and then on to the AC filter,  then to the Mult power supply (which ive removed), and finally  to the back of the cab to the mains terminal! Im guessing by the way its wired up, im going to need to keep the switch termial (though i could by pass that completly), the fueses, and the AC filter in the cab!

Do i need to remove the, +5v, -5v, and +12v pins from the Jamma connector, when pluging it up to a J-PAC, or are they ok to leave connected, as i notice the the J-PAC does not connect to these? And to get the coin mech & Marque lights, i need to connect them uip to a 12 V power supply, or to my PCs power supply?

[paigeoliver]

Ok, you guys are making this WAY too complicated.

Remove the blue power supply box entirely, tape off any wires coming from it. Any wires coming from the same spot should be taped TOGETHER (this keeps you from accidently breaking the ground loop, or AC wiring loop.

The mystery board is either a credit multiplier or a ticket dispenser controller. You don't need it, but leave it alone.

Your JPAC goes into the JAMMA harness, the extra harness coming off the control panel gets chopped open and those wires go to the extra position headers on the JPAC.

Nothing else need be, or should be messed with.

Marquee light will almost certainly be AC powered from the transformer, never seen a 12 volt one. Coin mech lights might very well be AC powered as well, if not then I believe the JPac has a 5 volt tap on it.

Trust me on this one, remove that power supply.

[Lilwolf]

Shouldn't you try and keep the power supply.. And just get some switches for it?

If you ever want to run a standard jamma board in you cab, you will still need it... and if you want to easy swap the pc / jamma board, you wan't it easy to add/remove.

[eggedd2k]

could the small pcb be a credit board??

[paigeoliver]

I say take it all the way out, there is no way to have any sad mistakes that way, there ARE ways to have them if you leave it in.

I would personally guess that the worldwide number of people who actually run JAMMA boards in their mame cabinet to be like 10. Is he one of the 10? Probably not.

[AlanS17]

Alan's comments were wrong...!
In your most recent photo... the BIG thing is the Isolation Transformer, and as I already said, the monitor is powered through that!

The part that says 5a, 2a, etc are FUSES. (Lift up the cardboard while you have the power off and you will see 3 fuses).

The small silver box is an AC power filter. It ensures that voltage is "clean" and doesn't have interference / noise on it.

The power switch.... Is a power switch.

[lettuce]

Thanks for the reply guys, i still want the coin mech to work, can i do this by wiring it up to my PCs 12+ V power supply? (believe its the yellow wire?). Do i need to earth the PCS power supply if i decide to remove it from the Case and mount all the PC componets on a single bit of MDF to save space?