Digitech RP200 noise problem - no input signal

buck1107 · Joined: 14 Mar 2005 Posts: 7

I've tried the headphones, but the result is the same as the output jack - the humming is still there.
2. I haven't tried the "jam in" socket yet
3. when I press both pedals together, it goes into bypass mode, although the humming is most pronounced like this (it's apparent in some of the presets, not all, although no input signal is ever heard)
4. the volume has been adjusted, but with no fix of the hum
Thanks,
Louis

lee_UK wrote:

first of all, plug some headphones in the headphone socket, does the hum still happen? if the hum has gone then this suggests a problem on the output socket and not the input socket.
2.do you get any hum when you plug a CD player in the 'jam in' socket?
3.what about when you press both pedals together to get the bypass mode on? what happens? still humming?
4. has the volume or level of the digitech at a sufficient level? you might have it set to 1 amd the amp up to 8, that would produce hum.

1bassleft · Posted: Fri Mar 18, 2005 11:50 pm Post subject:

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.

buck1107 · Joined: 14 Mar 2005 Posts: 7

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.

1bassleft · Posted: Tue Mar 22, 2005 12:09 am Post subject:

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

lee_UK · Posted: Tue Mar 22, 2005 9:41 pm Post subject:

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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