Repair case studies

Real repairs from our workbench: what the device did, how we found the fault, and the parts that fixed it.

Peavey DARK MATTER DM112 powered speakerPeavey Dark Matter DM112: powers on but no sound, mute relay never clicks (C131)The DM112 powers up normally (front LED on, controls respond), but there’s no sound from any input. The mute relay RL7 on the input board never clicks in after ...