(Topic ID: 34254)

Tech Help: Data East MNF Rom's 1 & 2 Not Working (Voice)

By nvu4prod

9 years ago

Topic Stats

  • 9 posts
  • 6 Pinsiders participating
  • Latest reply 9 years ago by dobo
  • No one calls this topic a favorite


Linked Games

#1 9 years ago

Hope everyone is enjoying the Holiday week!

Turned on my MNF this morning and Al Michaels did not welcome me to "MNF in Chicago". Grabbed my manual and went into sound diagnostics. Left, center and right sine tested fine along with the sound rom (music). However, the voice test for rom's 1 & 2 did not register. Tried a factory reset as well, with no change. Looked back into the backbox to see if there were any visual signs at the sound board and CPU, all components, ribbon cables, connectors and roms look clean with no sign of fatigue. Everything is working properly when turning on MNF except for the voices.

My guess is it's unlikely that two separate rom's would fail at the same time which would suggest a component failure on either the sound board or CPU.

Any suggestions that I might be able to troubleshoot further would be much appreciated!

Thanks in advance,


#2 9 years ago

I'd try reseating connectors and socketed ROMs.

Make sure ROMs don't have tarnish on the legs.

LTG : )

#3 9 years ago

Do as Lloyd suggests. If that doesn't solve the problem without a logic probe and multimeter you'll be hard pressed to diagnose the problem since it could be any of five components between the ROMs and the sound amps. Since the sound is working on all channels and you are getting game music it's not the voltages, amps, CPU or RAM on the sound board but likely something in the voice circuit.


#4 9 years ago

It really sounds like one or more pins/legs is not making contact on an IC socket somewhere. Could be a ROM, could be a PIA chip, could be a MPU chip(least likely).

#5 9 years ago

Thanks for the reply's LTG, Viperrwk and Snyper2099. I've reseated everything... Rom's. ribbon cable, and connectors from sound board and CPU with no change in operation. Above my head to solve this one, so the boards have been removed w/ribbon cable and are being sent of to good old Rob Anthony for diagnostic and repair. I will post an update after hearing from Rob. Thanks again!

1 month later
#6 9 years ago

Any update on what it ended up being? I'm buying a Swords Of Fury that has a similar (if not the same) problem.

#7 9 years ago

Yes, quick update on my MNF fix. Sent both the MNF CPU & Sound card to Rob Anthony for inspection.
He discovered the CPU was fine but the sound card had failed. He had a working replacement Sound Card for MNF on hand so I swapped the bad card for the good. Rob gave me the opportunity to either replace or have him service mine, so I can't tell you exactly what failed, however the rom chips were good. Good luck with your Swords of Fury!

#8 9 years ago

Thanks for the quick update! Cheers.

1 week later
#9 9 years ago

I think I'm having a similar problem its just that the monday night football song isn't playing. I have heard it a couple of times when i bought the machine but not reciently. That is the only sound problem. All other sounds seems to be working.Is there a sound rom just for the song? And how long does the machine have to be standing idle before the song starts playing? I turn it off when I don't use it but I let it sit for a while and haven't heard the song. I haven't dug deep into it yet. Does anybody have any ideas where to start?

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