Hello. My MTX Lolita sub just started turning on for about 3 seconds then shutting off with the signal light still green. It's been working flawlessly for over a year...now this. Any ideas?
"Is this a powered sub? If so, is it set to "auto on"? If so, either switch it to "off" or have the circuit repaired."
Where did I say place the switch to "on"? OK, if you must, leave the sub switched to "on" and disconnect all cables leading to and from the sub. What happens?
Ok, but will it run normally if it is wired to the high level inputs? The input sensor for low level may be staying on, but the speaker level may still work.
Ignore the literary comments, Keith. Some of these lowbrows are not up to speed.
If you haven't connected the high level speaker line inputs yet, stop and do this first. Connect your low level interconnect to the "LFE in" or whatever your sub indicates is line input. Disconnect the other end of that interconnect from the receiver and run the sub in the "auto" position for a few hours. So, all you'll have is the interconnect attached at the sub end and still no speaker output. If the problem recurs, you have a bad interconnect cable. If the problem doesn't come back, then disconnect the interconnect and hook the sub up via the high level speaker inputs. What happens?
I disconnected the line input from the receiver and put the sub switch to "auto" for an hour and the status light stayed green, meaning it thinks there is a signal being recieved from the reciever just no volume. Bad cable?
If your cable is shorted, disconnecting from the receiver will do no good. Disconnect the cable entirely.....just have the sub plugged into the A/C. If the 'on' light goes out with the switch in Auto/On, than it is probably a bad cable. If not, turn it off, using the switch and make sure the power light goes either out or red, like mine which has green for on and red for off. If it still doesn't go red, unplug it for a half hour or so, then with the power switch off, plug it back in. If it goes green yet again, the sensing circuit is locked on..... I have never taken apart a plate amp, but if there MAY be a relay involved with that circuit, that would be the simplest item to check. I don't know any more. When I worked on equipment, ALL relays plugged into sockets and were easily changed. My most recent experience, with my house's heater, had a circuit board with soldierd in relays. Bad on them, the dirty *&^()'s. If removing the power unlatches the on, than try speaker level inputs OR a cable.
Once again before you go to all that trouble, if you have another cable of any length that you know is functional, plug it into the sub and see what happens.