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So yeah I think it’s simply signal on channel 2 is not getting past the fader, or there’s a failure further upstream. If you want to rule out the fader an easy test would be to swap the channel 2 fader with another channel and see if the problem follows the fader swap. If it does the fader is...

So then it’s time to pull the bottom cover off and start checking where the signal stops passing. Just to confirm, you don’t get signal to pass from the channel 2 EFF send either right? Can you get signal to pass if you gently press down on the channel 2 fader knob with the fader level...

So basically you can’t hear any post-fade signal from channel 2 anywhere, anytime, correct?

Thanks for clarifying what you were talking about. So you can’t hear track 2 where when the AUX buss pre/post fade source switch is in post-fade mode?

Okay. I don’t understand what you mean by you have “Aux buss monitoring on every channel except channel 2. Which only has aux (pre fader) buss monitoring.” What is the difference between “Aux buss” and “aux (pre fader”? The AUX buss on the 388 is a pre-fader auxiliary buss. Period. So what...

I don’t believe I indicated or suggested you needed sophisticated test equipment…all I said was plug in a mic, and monitor off the ACCESS SEND jack for each mic input…SEND to home hi-fi receiver input…anything with a line level input and speakers or headphone jack. So anyway…your mic inputs are...

So your testing methods are unorthodox, and I’m not 100% confident they are conclusive, but I’m not sure how to ratchet that down and navigate that process, so I’m going to just say to your previous concern about your mic inputs, by virtue of what you shared above, signal is coming through all...

Okay. Now we’re getting somewhere. It was not clear to me at any point in the thread none of your mic inputs work. So you have connected a verifiably known working dynamic mic to mic inputs 1-8 using a verifiably known good cable, and turned up each the respective trim controls, and checked for...

I’m sorry…I don’t understand what you are either asking or what you are exploring and why.

Glad you know what the problem is. I didn’t think to ask if you verified the input was working, because you indicated in your first post you tried multiple inputs (referred to channels 1 & 2). I think rather than impedance, the problem is signal strength. Not sure what exactly you plugged...

And can you verify no L-R assign switches are latched (down position) on input channels 1-8?

What about the INSERT switch state?

Is the problem the same at the MONITOR OUT jacks? What is the state of the PGM/CUE switch? What are the states of the track arming switches?

I’d have to look at the whole gear assembly, but it’s possible the “gear C” experiences greater load, or lesser, so it was made out of different plastic, which unintentionally and unknowingly breaks down faster than the others…becomes brittle…something like that. It must just be a different...

Yeah, yeah that’s what I mean there. Yeah I do and they can be a pain to clean because they are small diameter. If the grease is hardened often it can be knocked loose with a toothbrush and fully removed with compressed air. That’s been good enough. Sometimes I can twist a thin piece of rag...

I think I generally take the assembly apart and clean off the old grease regardless…not the teeth, but the spindles themselves and the gear bores and apply new grease…maybe add a little to the gear teeth, but if the grease seems to be in good shape and things are moving freely I think it can be...

Hey, Daniel…IIRC I’ve always encountered some lubricant there…non-conductive I assume :) . I think in my experience it’s not been dry or hardened and I redistribute it to re-cover the contact tracks and call it good.

I’m not interested, but it might help to know how many channels (16, 24 or 32), and whether or not it includes the optional meter bridge. Also, I have a bit of a soft-spot for the M-2600 series because of what’s going on under the hood as well as the feature set…pretty cool for a budget...

I’d be careful with using actual abrasive paper on the edge connectors. I’m not sure how fine grit you used, but I wouldn’t even use 1000 or 2000 grit on edge contacts. If you truly need to burnish them, a good quality contact cleaner and multiple cycles of reseating is usually all that’s...

I don’t know what you read. You’d have to provide more specifics. It what I can tell you is PPM meters display the peak of the program material…PPM stands for Peak Program Meter. PPM meters can be digital (LED or plasma for instance) or analog. So what you see is more representative of the...