Fader issue with VP28

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Johnkenn

Member
Joined
Dec 2, 2011
Messages
17
Hey guys...hope this is the right place to ask this...if not, please let me know. I've built a VP28, but I'm running into a head scratching problem. The input gain works fine, but the Output fader is working in an "off and on" fashion." When the output fader is switched to 8, the signal passes. Before that, no signal. Turning it to 10 and 12 gets it no louder, it just seems to turn on at 8. I figured it could have been a cold solder or something on the fader, but I've touched up, resoldered, and I'm still getting the issue.

I've checked for continuity - I'm a newbie, so please cut me a little slack...I get readings on all the points, but some read really quickly and then go to open loop. Didn't know if that was common or not. I'd be shocked if it's a cold solder - I've checked it 20 times and they all look fine. Could it be a bad switch? I know that's pretty unlikely...
Anyway, any help would be appreciated.
 
Johnkenn said:
Hey guys...hope this is the right place to ask this...if not, please let me know. I've built a VP28, but I'm running into a head scratching problem. The input gain works fine, but the Output fader is working in an "off and on" fashion." When the output fader is switched to 8, the signal passes. Before that, no signal. Turning it to 10 and 12 gets it no louder, it just seems to turn on at 8. I figured it could have been a cold solder or something on the fader, but I've touched up, resoldered, and I'm still getting the issue.

I've checked for continuity - I'm a newbie, so please cut me a little slack...I get readings on all the points, but some read really quickly and then go to open loop. Didn't know if that was common or not. I'd be shocked if it's a cold solder - I've checked it 20 times and they all look fine. Could it be a bad switch? I know that's pretty unlikely...
Anyway, any help would be appreciated.
Hello,


this is the better place to post:


https://groupdiy.com/index.php?topic=48610.0


Anyway,did the fader switch have stop pins you had to insert?
If so then it might be that the shaft was in a wrong position while inserting pins.
Often seen it wrong.


If not then please post in the other thread,I'm sure Jeff or somebody else will help you soon.


Best regards,


Udo.
 

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