Troubleshooting a Pac-Man PCB with a new test rig (FIXED... dumb mistake!)

Mauricio

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Troubleshooting a Pac-Man PCB with a new test rig (FIXED... dumb mistake!)

Hey folks,

I finally got all the parts to assemble my test rig, and I want to run a Pac-Man PCB I purchased that was advertised as working. However... no picture or sound. So I am hoping someone here can help me with troubleshooting. It is possible and even likely that it is something wrong with my rig, and not the PCB. See the attached photo for the main setup.

  • Retroelectronik Supergun.
  • ATX power supply, with 24-pin plug connected to the supergun.
  • CGA/VGA converter board, connected to the supergun on the RGBS terminal block with the included cable, and to power with the other included cable. Note that that yellow wire is loose (see below).
  • Pac-Man PCB, connected to the supergun through a Mike's Arcade JAMMA adapter.
  • Amplified speakers, connected to the headphone (unamplified) jack on the supergun.
  • Dell 19" VGA monitor connected to the CGA / VGA converter.
  • Genesis controller, connected to the supergun P1 port with a Neo Geo converter.

Here is what is working:

  • The supergun can power up the ATX powersupply and reads 5.17V and 12.5V on the built-in display.
  • The CGA/VGA converter does display on the VGA monitor, just "No Signal" text, and the Chinese (ugh) menu if I push the menu button.
  • I am reading 5V with a DMM at the appropriate places on the Pac-Mac ROMs, as a sanity check.

Here is what is not working:

  • No game signal on the CGA/VGA converter, despite going through the various input options with the "SW" button (e.g. RGBS and RGBHV)... but I might have it wired up wrong. The included cable has yellow and white wires, but the supergun terminal block only has a single "Sync" point. I guess I need to wire up the wider RGBS port on the converter, but I don't have a cable for that. Thoughts?
  • I only hear a loud buzzing on the speakers (or headphones), which does change pitch as the system is powered up.

What else should I try or look for? Thanks!
 

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You have the jamma adapter flipped backwards, the parts side is the top. You have the parts side facing the solder side of the pcb.

Fyi, it is connected properly to the jamma harness tho.
 
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You have the jamma adapter flipped backwards, the parts side is the top.

You might be able to imagine the sound I made when I read this. =)

Flipped it, and all is well... see attached photo. This is the first working board of my new "hobby." THANKS!
 

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