Normal
Spinning the pot might fix the problem for a few minutes or days but its not a fix. Take it to an electronics tech and have the pots cleaned with Cramolin spray cleaner. Have the tech vacuum out the interior of the amp chassis as well. If the amp isn't in a closed rack with its own fan and fan filter cut a piece of AC filter foam to cover the fan inlet on the back panel and use velcro around the inlet to hold the foam. Clean the foam every month until you get a sense of how fast it's getting clogged with dust.Moving the amp will certainly run the risk of breaking the cables at the connections. Permanent install amps are meant to be installed in a closed rack with all the wires tie wrapped to tie bars that run across the back of the rack to to support the cables. The amp should be in a case even if it does get moved. Simply install a back panel on the rack and install XLR input connectors and NL4 output connectors on that panel and connect those to the Euroblock terminals. A quick Google search for the term "dressing cables for Euroblock Connectors" turned up this and many more pages of hits. Pat and Brenda Brown know their stuff. Read and do what they say. Also get a copy of the Yamaha Sound Reinforcement Handbook.[URL unfurl="true"]https://www.prosoundtraining.com/2018/02/15/useful-tips-euroblock-connectors/[/URL]
Spinning the pot might fix the problem for a few minutes or days but its not a fix. Take it to an electronics tech and have the pots cleaned with Cramolin spray cleaner. Have the tech vacuum out the interior of the amp chassis as well. If the amp isn't in a closed rack with its own fan and fan filter cut a piece of AC filter foam to cover the fan inlet on the back panel and use velcro around the inlet to hold the foam. Clean the foam every month until you get a sense of how fast it's getting clogged with dust.
Moving the amp will certainly run the risk of breaking the cables at the connections. Permanent install amps are meant to be installed in a closed rack with all the wires tie wrapped to tie bars that run across the back of the rack to to support the cables. The amp should be in a case even if it does get moved. Simply install a back panel on the rack and install XLR input connectors and NL4 output connectors on that panel and connect those to the Euroblock terminals. A quick Google search for the term "dressing cables for Euroblock Connectors" turned up this and many more pages of hits. Pat and Brenda Brown know their stuff. Read and do what they say. Also get a copy of the Yamaha Sound Reinforcement Handbook.
[URL unfurl="true"]https://www.prosoundtraining.com/2018/02/15/useful-tips-euroblock-connectors/[/URL]
