Star Trek: The Next Generation
Williams, 1993I am working on a STTNG and there is an issue with the sound (video as per the below link)
The usual capacitors have been replaced and U18 has been socketed and replaced as it was blown.
Where do I need to look next as the sound quality is not improving. I have also tried another sound card and had no issues.
https://drive.google.com/file/d/1QN27R2zLm4uISDATQk1eIB-XMazpplS_/view?usp=sharing
Thanks in advance.
IMG_4293 (resized).jpgQuoted from Purplecheesemonk:Your c37 capacitor is missing.
https://www.pinwiki.com/wiki/index.php/Williams_WPC#Scratchy_Audio_or_mumbled_speech
Quoted from RonaldRayGun:Please add public access to the shared link.
Ahh sorry, I have now updated this to public access.
https://drive.google.com/file/d/1QN27R2zLm4uISDATQk1eIB-XMazpplS_/view?usp=sharing
Quoted from Purplecheesemonk:Your c37 capacitor is missing.
[quoted image]
Thank you for the feedback. C37 and C45 have been removed as per the pinwiki advice although this did not make any difference to the sound quality.
I have a similar problem.
https://pinside.com/pinball/forum/topic/distorted-sound-wpc-dcs
In the post from RonaldRayGun above, there is a link to a thread where
JeffHecht comments about unbalanced supply voltages. Check that out.
The suggestion, assuming you find those voltages unbalanced, was to install 470ohm,1/2W resistor across each of the two 10K caps.
Interesting issue.
—
Chris Hibler - CARGPB #31
Http://chrishiblerpinball.com/contact
http://www.PinWiki.com/ - The new place for pinball repair info
Quoted from ChrisHibler:In the post from RonaldRayGun above, there is a link to a thread where JeffHecht comments about unbalanced supply voltages. Check that out.
The suggest, assuming you find those voltages imbalanced, was to install 470ohm,1/2W resistor across each of the two 10K caps.
Interesting issue.
—
Chris Hibler - CARGPB #31
Http://chrishiblerpinball.com/contact
http://www.PinWiki.com/ - The new place for pinball repair info
ChrisHibler thanks for pointing this out. I just checked the voltage and I got the following results.
C18 = 17.4v
C19 = 17.3v
Looks to be balanced.
Any thoughts on what else may be a cause.
Quoted from RonaldRayGun:I have a similar problem.
https://pinside.com/pinball/forum/topic/distorted-sound-wpc-dcs
It looks like you have had this problem for some time. Is it still something that is a problem on yours.
Quoted from martymart:It looks like you have had this problem for some time. Is it still something that is a problem on yours.
Yes, I ended up replacing it with a Pinsound board, the sound is awesome from that thing. But I still like to fix the original board.
Quoted from martymart:ChrisHibler thanks for pointing this out. I just checked the voltage and I got the following results.
C18 = 17.4v
C19 = 17.3v
Looks to be balanced.
Any thoughts on what else may be a cause.
Just thinking about this. What should the voltage be at this point is 17v to high?
Wanna join the discussion? Please sign in to reply to this topic.
Great to see you're enjoying Pinside! Did you know Pinside is able to run without any 3rd-party banners or ads, thanks to the support from our visitors? Please consider a donation to Pinside and get anext to your username to show for it! Or better yet, subscribe to Pinside+!
This page was printed from https://pinside.com/pinball/forum/topic/wpc-dcs-sound-board-issue?hl=martymart and we tried optimising it for printing. Some page elements may have been deliberately hidden.
Scan the QR code on the left to jump to the URL this document was printed from.
Singapore
Matthews, NC