Mailist to discuss all issues regarding the Digitech GSP-2101 Guitar FX Processor

Pots do get dirty, but not enough to completely block out the signal in 
any position- that would be more than dirt. those pots can rub a gap 
between the wiper and the seat causing noise and signal loss, but a 
dirty pot is a bit different.. And, any half way decent tech could 
replace them for pretty cheap.

As far as no "sound" on the outputs-

That is strange. the 2101 doesn't have a power section like a regular 
amplifier does. After signal goes through the tube(s) it goes right into 
digital processing and signal mixing. it's all line out voltage . That 
is why you need a powe4r amp or powered PA to plug it into and get sound.

So there are only a few possibilities if everything is hooked up 
correctly. in almost all cases, if there were something physically wrong 
with the unit then you would get an error on the display screen. bad 
tubes wont necessarily generate an error nor will pots or jacks.

#1 Do you have the foot controller? the expression pedal could be set as 
a volume control or the previous owner could have had it set to work 
with another expression pedal. Mine is set this way, where I have a cry 
baby pedal, then use my foot control pedal for volume. Try resetting the 
unit to factory settings.

#2 one or both tubes are shot.

Have you checked the tubes? You should pull them and put them on a tube 
tester or replace them- they are only $12.00 a piece at thetubestore.com.

#3 bad jacks or cables

This is the number one time consumer for troubleshooting. Again a new 
cable or a half way decent tech can resolve this.

#4 one or more of the DSP effects are bad.

Its going to cost a lot. more than the unit is worth. It would be better 
to buy another one or buy a similar and newer type unit. In looking at 
the schematics, the signal enters through an op-amp controlled channel 
switching circuit, then to the compressor/limiter circuitry and then to 
the tubes. Once a signal comes out of the tubes it is all digital 
effects from there on out.� the signal loss could be happening ANYWHERE 
from the input jack on. it could take as much as 3 or 3 hours to test 
just to know what exactly is wrong, and then however much time to fix it 
plus the parts.

really there is nothing more to it than that. There are settings in the 
limiter and the distortion settings that could make it go quiet, but not 
100% loss of signal.

I think, one thing you could do is to put a voltage meter to each of the 
output jacks. Just get a guitar cable and cut it in half. plug it in and 
hook the mutimeter leads to the cable and try to get a reading. at least 
then you would know if there is signal.

On 3/30/2019 4:07 PM, mk_nodelocked@... [gsp-2101] wrote:
>
>
> I have a similar issue with a backup 2101 unit. I don't get sound out 
> of head phones or rear jacks unless I turn off the pre amp section. 
> The outputs work with pre amp for a few seconds right after turning on 
> the unit cold. Followed by crackling noise and no audio output at all 
> after that. The unit works fine as a multi-efx box without distortion. 
> See if you get sound after turning off the pre amp section in your 
> patches. The pre amp section could be the culprit here.
>
> /mk
>
> ---In gsp-2101@yahoogroups.com, <webbsguitars@...> wrote :
>
> Twas not the loop?i heard a crackling and cutting out right before it 
> stopped.could it be the output section.im flying blind here
>
>     On Mar 30, 2019 2:46 PM, Scott Webb <webbsguitars@...> wrote:
>
>         Thanks Nick i will try it
>
>         On Mar 30, 2019 2:40 PM, "Nick Williams nickwilliams@...
>         [gsp-2101]" <gsp-2101@yahoogroups.com> wrote:
>
>             I may be wrong but if you have a jack in the fx send and
>             nothing going back into the returns, that might give you
>             the symptoms you have. Try changing the external fx loop
>             setting in the algorithm, 5 right arrow presses should get
>             you there.
>
>             On 30 Mar 2019, at 16:22, "Scott Webb
>             webbsguitars@... <mailto:webbsguitars@...>
>             [gsp-2101]" <gsp-2101@yahoogroups.com
>             <mailto:gsp-2101@yahoogroups.com>> wrote:
>
>
>                 Hi my first post. I have purchased a gsp 2101 and it
>                 has sound at the effects send but none at the outputs
>                 or headphone jack. Any ideas greatly appreciated.
>                 Thanks Scott
>
>
>
>
> 

-- 
Ken Rowe
Longmont