Music is playing, the deck says so, but the channel is dead. Don't start turning everything — walk the signal chain in order and the fault identifies itself in under a minute.
The rotary/switch at the top of the channel strip must match the socket the deck is actually plugged into — LINE for CDJs, PHONO for turntables, USB/digital for a laptop. This is the #1 cause: the channel is listening to an empty socket.
If the channel's own meter shows no signal, the problem is upstream — cable or source. If it shows signal, the problem is downstream. Set TRIM so peaks sit around 0 dB.
Three EQs fully off (on kill-type EQs) = silence that looks like a fault. Filter knob hard left or right on a V10-style channel filter = the same. Twelve o'clock everything.
Fader up is obvious — the crossfader assign switch isn't. If the channel is assigned to side A and the crossfader sits on side B, the channel is muted by design. Set the assign to THRU when you're not scratching.
Signal on the meter but nothing anywhere? Swap the suspect channel's cables with a working channel. Fault follows the cable = cable. Fault stays = the channel; try a different input on the mixer.
A mixer channel is a fixed series chain — input select → trim → EQ → fader → assign → master. A break anywhere kills everything after it, so testing in chain order finds the break without guesswork.
Fixed it? The manual this came from covers the DJ mixer the same way — every control, every failure mode, in plain English with diagrams. DJM-V10-LF — The Complete Visual Guide — £13, instant PDF.
Get the manual → £13 Or keep using the free stuff →