Jamma cab to Mame - power advice

[willmame]

Hi, I bought a Jamma cab, have successfully replaced all joysticks and buttons, fixed some of the wiring on the Jamma harness, and have a PC prepared ready to be put into the machine with ArcadeVGA2 installed... I've got Jpac too.

So, the situation with the power supply in the cabinet is confusing me.  I'ev read tons of information on this and am now more confused than ever.

As far as I can see, it doesn't look like there is an isolation transformer in the machine.  There cable from the mains goes inside the machine and goes to a switch (the on/off switch is inside the machine!).  From there a cable goes to the bottom terminals on the power supply.  There are other things wired to the bottom terminals.  The monitor is also powered from the power supply (the monitor is made by Hantarex).  I am going to rip out the existing speakers and use a set of PC speakers, and I'm not bothered about having the marquee lit or the coin door working (although it would be nice to keep the funtionality to add coins to increase credit if possible).

So, my idea is this.  Get the exisiting power cable out and replace it with a four-way surge protected power strip.  Wire a plug to the monitor power cable and plug that into the power strip, along with the plug for the PC speaker and the plug for the PC itself.

I'm a little concerned as I've read so many articles saying that a monitor should always have an isolation transformer, but unless I'm looking for the wrong thing I really don't see one in the existing cabinet.

Can anyone help or point me in the right direction?

Cheers!

[pincky]

Hi, I bought a Jamma cab, have successfully replaced all joysticks and buttons, fixed some of the wiring on the Jamma harness, and have a PC prepared ready to be put into the machine with ArcadeVGA2 installed... I've got Jpac too.

So, the situation with the power supply in the cabinet is confusing me.  I'ev read tons of information on this and am now more confused than ever.

As far as I can see, it doesn't look like there is an isolation transformer in the machine.  There cable from the mains goes inside the machine and goes to a switch (the on/off switch is inside the machine!).  From there a cable goes to the bottom terminals on the power supply.  There are other things wired to the bottom terminals.  The monitor is also powered from the power supply (the monitor is made by Hantarex).  I am going to rip out the existing speakers and use a set of PC speakers, and I'm not bothered about having the marquee lit or the coin door working (although it would be nice to keep the funtionality to add coins to increase credit if possible).

So, my idea is this.  Get the exisiting power cable out and replace it with a four-way surge protected power strip.  Wire a plug to the monitor power cable and plug that into the power strip, along with the plug for the PC speaker and the plug for the PC itself.

I'm a little concerned as I've read so many articles saying that a monitor should always have an isolation transformer, but unless I'm looking for the wrong thing I really don't see one in the existing cabinet.

Can anyone help or point me in the right direction?

Cheers!

I am looking into seprating the monitor power from the rest of the PCB power supply becasue i don't need it
i will keep looking

[CheffoJeffo]

As far as I can see, it doesn't look like there is an isolation transformer in the machine.  There cable from the mains goes inside the machine and goes to a switch (the on/off switch is inside the machine!).  From there a cable goes to the bottom terminals on the power supply.  There are other things wired to the bottom terminals.  The monitor is also powered from the power supply (the monitor is made by Hantarex).

Pics would be helpful.

I am presuming that the monitor is also connected to the "bottom terminals", so is not "powered from" the power supply, but merely connects there because that is where the main AC connects to the PS.

I THINK that the Hantarex Polo did not require an ISO, but you would be well-advised to double-check that.

[willmame]

I tried this weekend to get pictures but none of them turned out clear...

So, I've written down how it is wired up.

The terminals on teh power supply, from the bottom terminals up, are labelled like this:

+12v 2.5A
-5v 1A
GND
GND
+5v 15A
FG (All cables on this are yellow&green)
AC (All cables on this are blue)
AC (All cables on this are brown)

The cable from the mains is fed through the back of the and goes to a switch, and then cable goes to the bottom terminals on the power supply (brown, blue, yellow & green).

The monitor is also wired to the bottom terminals with the same colours.

The monitor is a Hantarex POLO 25" (220-240vac, 50-60Hz 0.9A) - I did a search on Google and couldn't find much, but did find one mention that the Polo does not require an Iso transformer.  Is there a way I can verify that?  Is there a manual for the monitor I can download?  I'm 99% sure that there isn't on in the machine as it is, so I'm pretty sure that the monitor doesn't require one.  Is there any specif amp fuse I need for the plug?

So, assuming that I am not bothered about the coin door, marquee light, and speakers to be powered, I can disconnect the mains from the bottom three terminals on the power supply, and wire a standard 3-pin plug to the monitor cable and plug that into a surge-protected power strip which I will also be powering the PC from and the PC speakers from.

The power supply also has a label on it that reads:
95v ~ 135vac
190v ~ 260vac
Inside Change
47Hz - 63Hz

Thanks for your help with this!

[CheffoJeffo]

The monitor is a Hantarex POLO 25" (220-240vac, 50-60Hz 0.9A) - I did a search on Google and couldn't find much, but did find one mention that the Polo does not require an Iso transformer.  Is there a way I can verify that?  Is there a manual for the monitor I can download?  I'm 99% sure that there isn't on in the machine as it is, so I'm pretty sure that the monitor doesn't require one.  Is there any specif amp fuse I need for the plug?

Here is a link to the service manual for the Polo:

http://arcarc.xmission.com/PDF_Monitors/Hantarex%20Polo.pdf

I does appear at first glance (only have time for a quick glance just now) that an ISO is not required for basic operation (but earth grounding to the monitor frame is), but you may want to post this question in the Monitor forum and I'm sure that someone like Ken Layton will know right off the bat.

[willmame]

Thanks for the link

I have posted the question in the monitor forum.  I think the monitor is grounded to the frame already.

So, if the monitor doesn't require an Iso Transformer, would wiring it to a plug like I described above work?

My cabinet is sooooooo close to being finished

Thanks!