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First, plug your guitar and cable into a different amp to make sure the problem is the amp. Then check to see if you have output from any headphone jack or effects loop. If so your problem is in the power amp section. If not, it's likely the preamp section. Whichever section it is, it will most likely need to go to the shop.
If you are being asked to reload the OS, you will have to do that. SOME devices have trouble with USB sticks that are larger than some limit... that may or may not be specified. If you haven't tried reloading, try it with a USB stick no greater than 1GB... yes they are getting hard to find that small.
OFTEN Roland has the opposite sense of normally closed contacts versus normally open. Test the switch with any continuity tester or an ohmmeter to see that the contacts work and come out to the switch. ALSO some amps require a TRS type connection (three wire plug) and others do not. From the schematic it appears that the Laney may REQUIRE a normally closed contact. There is also a pull switch involved that you MAY have to change the state of for operation of the pedal.
Best to leave the limiter on unless you want to blow the amp and require repairs. Limiters protect the amp and also sometimes the speakers. The limiters reduce the gain when the amp reaches the maximum swing. If the gain were not reduced the amp would "flattop" which results in the circuitry saturating and massive distortion and if this condition is sustained, components can overheat or short out requiring repair. The LED MAY be just an indicator of clipping rather than an indicator of on/off. I downloaded the manual and what I have just said is CORRECT. The LED is a clipping indicator.
There is a caution regarding this amp and the sequence to turn power on. This amp does NOT have good speaker protection and you have to have the gain control down when turning on. The limiter, if you leave it on, might help protect your speakers when powering on. Most good power amps have circuitry to disconnect the speakers while amplifier is powering up and becoming stable, this one does not, so heed the warning and for certain leave the limiter ON... It just might save the amp and your speakers.
clean all "vr" (variable resistors) like volume bass treb etc, sounds like bad contacts. this happens due time while they oxidating. maybe helps. use "contact" spray for best result
The second jack which is present on MOST speakers is for daisy-chaining a second speaker. One has to make sure to NOT go below the minimum impedance allowed by your amplifier. Often this minimum is 4 ohms which allows TWO 8 ohm speakers to be connected to the 4 ohm output.
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