Fish Tales sound freeze

[pinballmania]

Whiz through to about 4mins in, unless you especially like the fish tales tune.

Anyone seen this problem before? Any known fixes?

Searched internet, but no helpful fixes found.

I have three boards with similar symptoms, but definitely on the circuit board, as other boards work fine in the test machine. The eprom is also known good.

Andy

 

[xenon325i]

Hi there - I don't know if this thread is still alive.....

I can't see your video but it sounds similar to what my recently-acquired FT is doing. I've already done a load of stuff on the CPU board to get the switches working properly. Anyway, on mine it seems to be a problem as it switches tunes, i.e. switching from the regular theme tune to the multiball tune; after multiball has finished the theme does not restart until the next ball. It seems something is getting latched and not cleared. My suspicion falls on the two 74LS374 flip-flops acting as data buffers (U29 & U30) so I've just replaced those. I'll plug the board back in when I get home and see if that fixes it. If not I suspect it may be the RAM at U9.

Ian

 

[pinballmania]

Never progressed the problem and intended to change the 374s next. Already did the ram with no affect. Will be interested to know if you succeed.

 

[xenon325i]

Never progressed the problem and intended to change the 374s next. Already did the ram with no affect. Will be interested to know if you succeed.

Hmm. Sorry to hear the RAM didn't fix it as that's my next plan. Changing the buffers made matters worse: I got no sound at all. It's definitely a digital issue though (as opposed to amplification etc) because if I plug the data bus onto the sound card the display has weird effects. Game functions perfectly with sound board disconnected. If it's not the buffers and it's not the RAM then what next??