Cheektavegas, NY
Having a sound issue on my No fear . The cabinet speaker sounds low and muffled. I’ve had the board recapped and the amps replaced.
Still no better. Suggestions? Thanks in advance
(Topic ID: 317080)
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1 week later
The first thing I did was swap speakers… no difference. Even after the board work, Still sounds low and muffled. However after the board work, the back box speakers sound a bit more robust! Can other NF owners chime in on this one?
Quoted from PinRetail: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!
Thanks for the responses! Hopefully I’ll be able to post the answer.
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