Digitech RP200 noise problem - no input signal

Hi, I have a Digitech RP200 that only makes a hum when a cable is plugged into the input jack. There is no hum when nothing is plugged into the input. Could this be a bad input jack? It seems secure to the circuit board. Thanks, Louis

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Slight misunderstanding, Lee. I suspect the guitar input jack of the RP, not the jack socket on the guitar itself. Excellent call, though; the FX output jack is now ruled out. Buck, if you follow up Lee's suggestion with the jam-along input (alone), and this is glitch-free, then it's really got to be the instrument input jack. This takes more punishment than the rarely-used aux in.

Even if the soldering to the input socket looks OK, I have a deep dislike of cheaply made jack sockets. The steel loses its elasticity and you may not have as good a sleeve contact as you'd like (and therefore no earth). If you have no hum from an aux input, a good Switchcraft 1/4" on the guitar input could well solve the problem. As said, I'm no expert, but it fits in with bypass giving you the worst hum. The FX circuitry could filter out some of the hum frequencies you're getting from bad earth.

Lee, 1bassleft, thanks for the help in this!
I tried the jam-along input, and it was OK. I fixed a cheap jack on a Peavey amp not too long ago, and it was the same type of 3 conductor, mostly plastic jack (cheeeeap).
I'll either go out and get a stereo jack or just wire in a mono jack and wire left and right together for a test to see if it works ok.

1bassleft wrote:
Slight misunderstanding, Lee. I suspect the guitar input jack of the RP, not the jack socket on the guitar itself. Excellent call, though; the FX output jack is now ruled out. Buck, if you follow up Lee's suggestion with the jam-along input (alone), and this is glitch-free, then it's really got to be the instrument input jack. This takes more punishment than the rarely-used aux in.

Even if the soldering to the input socket looks OK, I have a deep dislike of cheaply made jack sockets. The steel loses its elasticity and you may not have as good a sleeve contact as you'd like (and therefore no earth). If you have no hum from an aux input, a good Switchcraft 1/4" on the guitar input could well solve the problem. As said, I'm no expert, but it fits in with bypass giving you the worst hum. The FX circuitry could filter out some of the hum frequencies you're getting from bad earth.

Buck, looks/sounds like the bumhum is sourced. Well done, Lee - you can now press the moderators to label you "Lee - P.I." -glitch investigator and licensed to drive hot cars through cardboard boxes in alleyways just for the visuals :wink:

I need elevation to a new level, i need a new badge, just like they get in TGI Fridays, something that denotes my new status 'RP200 fixer'
are you reading this Mr Mod??

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