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How to test if J-PAC is dead?
#337999 - 03/24/15 04:50 AM
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Hi, I've a J-PAC ordered less than two months ago.
The first time I tried connecting it to my arcade machine it worked for a few minutes. After fiddling with it, it shorted and the monitor went black.
I managed to find an electrician who fixed the monitor and now the original JAMMA board works fine, but I'm a little nervous about putting the J-PAC again. The electrician also replaced the original JAMMA connector, which had a few problems of its own, and resoldered all the cables.
After connecting the J-PAC to my PC again (but just the
PC), it seems to be dead.
If I just plug the J-PAC with the USB cable, the self test led lights up and stays on so it should be OK. The J-PAC is NOT connected to the arcade machine, it's just connected to a PC, but the PC does not detect anything. Windows doesn't make a sound, Device Manager does not refresh/show anything new. Tried with a few different computers, putting a PS/2 keyboard into the pass-thru, nothing works. The PS/2 keyboard leds lights up for less than a second and then stays off. Also tried connecting to a PS/2 PC port with an USB to PS/2 adapter, does not work either.
So I've a few questions that hopefully someone can help me with:
- Should the J-PAC work/turn on/be detected if it's just connected to a PC via USB or PS/2?
- Is the SELF TEST led reliable? Can something else be blown?
- Can I test it connecting it to a JAMMA connector with the arcade off? I don't want to kill the monitor again.
Best regards,
Ivan
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The JPAC installation instructions on the Ultimarc website specifically recommend disconnecting low voltage (12v and 5v) from the JAMMA connector to prevent this issue. Also, you should not run the power supply without a load, so if you do not have a JAMMA arcade board connected to it, disconnect it from the A/C power to prevent it from burning up.
If your arcade has a power supply that originally powered a JAMMA board, you should disconnect it from the power. See attached picture. The power supply is the box thing on the left.
The JPAC will not work through a USB to PS/2 adapter. I believe there is a special cable available from Ultimarc for this purpose.
[ATTACHED IMAGE]
Edited by krick (03/24/15 05:25 AM)
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GroovyMAME support forum on BYOAC
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Hi krick:
Thanks for answering. It seems probable that I killed my J-PAC.
But I want to be sure before I order a new one. Do you know if just plugging it in to a PC should make it detectable to Windows? Like in the attached picture. The SELF TEST led is lit so maybe it isn't dead?
[ATTACHED IMAGE - CLICK FOR FULL SIZE]
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