Clean or change control pots on sound board.

So, on No Fear, all three speakers are run through each other then back to the sound board.

You don't have a broken wire, but maybe you have a bad speaker?

When you turn up the volume, do the two backbox speakers get uncomfortably loud? This game was designed to compete with a hundred other games in a video arcade and still get it's share of attention. It should get REALLY LOUD if you turn up the volume.

A volume level of six or seven should be all you need for home use, and if you turn the volume up to twenty or twenty five it should be so loud that you start feeling uncomfortable going higher because you think you are about to blow speakers.

If the upper speakers are really loud, but the bottom speaker isn't, I'd replace the speaker and see if that was the problem.

If you don't get really loud sound anywhere, then I'd suspect that you haven't fixed everything that needs to be fixed on the sound board and the speakers aren't in general getting enough power.

Let us know what you find!

Hey! Sorry for the wrong information.

I just checked the manual, and unlike many of the 90's model WMS pinballs, the speakers are not run in series.

This means that J1 on the sound board is completely in control of the cabinet speaker, one amplifier circuit for the cabinet, one amplifier circuit for the two backbox speakers. So it's quite possible you have one amplifier circuit still unrepaired on the board.

One of the things I do when I've got this problem is to knock out the keying pin from the plug connecting the cabinet speaker to J1 (this is difficult, and often I just quickly make up a new connector without any keying pins), and I put the cabinet speaker on the J2 plug on the board.

If I now have lots of sound from the cabinet speaker, I know that I have a board problem and my problem is with the 'upper' section on the schematic of the audio output, U27 (TDA2030A) and all the stuff surrounding it.

Of course, if you still get muffled cabinet sound... I dunno. Really pinched damaged wires? Somebody put in an 8 ohm speaker instead of a 4 ohm?

Let us know what you find!