Quick Troubleshooting Guide - Rivera Knucklehead Reverb KR 55T Owner's Manual

Clean your amp once in a while.
You can use a damp but not wet cloth, or one moistened in a weak solution of
dishwashing detergent and water to wipe off grime, dried Pepsi, Beer, and whatever
else accumulates on the vinyl covering. If you use Gaffers or Duct Tape to hold Picks
on the surface of the Knucklehead Reverb and you need to remove the adhesive, use a
small amount of Rubbing Alcohol on a soft cloth, then wipe off the residual with a
soap/water solution. Make sure the amp is unplugged first. Also, make sure that no
liquid is spilled into the top ventilation grille, or that the tubes have any liquid of any
source dripped on them. Everything else can be vacuumed, as long as you're gentle
and use a soft-bristled brush attachment on the vacuum hose.

Quick Troubleshooting Guide

Amp won't turn on
Make sure that the AC mains cord is securely connected at both ends.
Verify the power source with something that you know works (a radio, a light, etc.).
Check the Mains Fuse, and replace it if necessary (if it blows again, refer your amp to
qualified service personnel).
There's no sound
Make sure that the guitar cord to the input is okay (wiggle it—check your guitar's volume
setting, too).
Check the Volume controls.
Check the Standby switch.
If an effect or signal processor is plugged into the Effects Loop, make sure it's turned on
and that the level controls on the amp and processor are set correctly.
Check the speaker cable or cables to see if they are disconnected or shorted.
Check for blown speakers.
If a fuse is blown, replace it (if it blows again, refer your amp to qualified service
personnel).
The amp shuts down unexpectedly
Follow the seven steps in the "There's no sound" section.
Turn off the amp and wait 25 minutes before turning it on again. An internal thermal
protection circuit can shut the amp down if it becomes overheated.
After 25 minutes, turn it on, and if it shuts down again, refer the amp to qualified service
personnel.
Knucklehead Reverb 1.0 p 32