(Topic ID: 232408)

WPC sounds muddy/distorted on CFTBL

By Chet

4 months ago

Topic Stats

  • 8 posts
  • 6 Pinsiders participating
  • Latest reply 4 months ago by PinballManiac40
  • No one calls this topic a favorite


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#1 4 months ago

Greetings. My creature voice and music sounds have always sounded muddy/distorted in comparison to the fidelity of the sounds from my other games of this era (Getaway, TAF, BSD). All voice calls and music play and do not cut out or anything like that. The board is a pre-DCS A-12738-20006 series board. I replaced the original factory speakers with a set of FF speakers adjusted the volume balance control but they did not make any noticeable improvement to the muddy sounds. I then replaced all the electrolytic caps and some other tant caps (C20,C21,C22,C18,C15,C34,C36,C38,C35,C32,C3,C24,C25,C46,C47) but no noticeable improvement. I tested all the Resistors on the board including pulling one leg on some of them to get accurate readings with my ohm meter. All the resistors tested well within spec. Note the board was original and had no previous work done. All the sound ROMS are original factory as well as the audio amp. I tested the diodes D1-D6 and they are o.k. I tested the voltage outputs of the voltage regulators U3 and U4 and the voltages tested -11.96v and +12.05 volts so those I feel are the correct output voltages. Visual inspection shows no heat or burnt caps or components on the board.

Was hoping someone might that have some experience and have other thoughts, ideas, or suggestions on what I should check or consider replacing on the board. There is not much written on troubleshooting these boards in Clays manual and even much less on Pinwiki.

#2 4 months ago

I always felt that CFTBL had muddy sound compared to some others in the era so maybe it’s just that. If you haven’t already, I’d get all new ribbon cables as it’s likely time and then try new sound rom.

#3 4 months ago
Quoted from dmacy:

I always felt that CFTBL had muddy sound compared to some others in the era so maybe it’s just that. If you haven’t already, I’d get all new ribbon cables as it’s likely time and then try new sound rom.

Yep... I always thought they sounded bad too.

#4 4 months ago

I just tested game with a new CPU-fliptonic-sound-DMD controller board ribbon cable from Great Plains electronics. Unfortunately, new ribbon cable did not change or improve the sound and music.

#5 4 months ago

I think the sounds are what they are. The only way to make even a slight difference that I’ve found is to replace the 47uf caps as you’ve done.

Chris Hibler - CARGPB #31
http://www.PinWiki.com/ - The new place for pinball repair info

#6 4 months ago

I don’t find the sound / music that bad or muffled on my CFTBL. I run subwoofers on all my pins and it makes such a big difference. Give that a try as it really fills in the missing low frequencies. Once you play your machines with this set up, you won’t go back.

#7 4 months ago

Not all the music and voice calls are bad but some are muffled and slurred more than others. Wish that I had another creature available to compare mine with. I could try a different set of speakers. I have subwoofers on some games and I plan to hook a sub to creature to hear what it sounds like. Creature does not have much base. I was trying to clean up the sound before hooking up a sub.

#8 4 months ago

At what volume levels does it sound good and when it does not?

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