Sounds like only one amp is working. Then after a few minutes the red light goes on and the unit shuts down.
This unit was purchased about 2 years ago for use as sound reinforcement for lectures and meetings. It had been used only twice. It was purchased new from Musicians Friend. I hook-up the speakers as usual and plug in a mic. Very low volume no matter how hi i turn up the gain. All of a sudden the red light goes on to indicate overheating problem. Can't get any volume. Sounds like only one amp is not working. the unit has been used twice for meetings! What's up with this?
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Your unit is telling you that there is something wrong. This can be in two places, your power supply is shutting down (thermal) because of a component fault, and or your Amp(s) are overheating due to also a component fault. My guess, for what it's worth, is one of the amps has a bad final so I would disconnect the power supply from the amps and see if the unit keeps running. If it does than re-connect one amp at the time and see what happens. This should get you a fair way in to finding the fault. Have fun.
Not likely a grounding problem. Run a test: Turn on unit with NO sound into the mics and wait 5 minutes... now try the mics. If they start working for a few minutes, then the amp is being overdriven. These small systems can be overheated and a thermal protector shuts them down to protect them. A hidden problem is if the mics are in front of the speakers you MIGHT have ultrasonic (above hearing range) feedback that may be overheating the unit. Put your speakers nearer the audience and mics behind. If problem persists, exercise your warranty.
This amp uses a TDA2050 chip that has thermal protection. It is also a small amp that is NOT capable of high sound levels. If *********** can't stand to be within 5 feet of this amp you are playing TOO LOUD for this amp and it will shut down until cooled off to protect the amplifier chip. This amp is intended for practice. It would be adequate for sensible listening level in a 10 foot by 10 foot room. If you need more sound you will have to get a bigger amp. I would suggest you get a sound meter and verify the sound level. DO NOT exceed 4 hours at 90 DB... I know a lot of deaf musicians that have lost their hearing and they are not much good anymore.
Holding the page up and down buttons while powering on supposedly resets it. I have no sound except demos, but no lights showing like yours, and williams tech support said to reset that way but it didn't seem to do anything. Good luck hope this helps!
Since the PA clip is not lit, the problem seems to be up front...
First thing is to look for a bad cable as a broken ground could be putting hum at a clipping level. First thing, test this by unplugging all inputs. If the clipping light goes out, then you have bad cables or a ground loop.
Try sending a line level signal into "Effects return" to test if the power amps are OK.
If the clip light is still on, turn all gain controls down to minimum. If light is still on then take unit for servicing.
Our bassplayer had the same problem with his mb4410.
As it turned out, the fan was not working when the amp got hot. It did turn when cold - go figure!
Swap the fan for a good quality (Pabst, Sunon) 80mm pc fan with 2-wire connection. Three or four wire fans will not work w/out modding.
See your local pc guy and ask for an unregulated, silent 24/7 fans. He will know.
Our bassplayer sold the P.O.S. while still in warranty.
go back in and find where the electrolitic capacitors connect to the board. They look kind of like a battery. One or both of them have broken loose from the main board, preventing any significant current from going to the output transformer, and causing overload. This is a common problem, and it does not take much rough handling to cause it.
where the break is is at the solder connection. Under a magnifying glass, the break will look like a little circle. Float fresh solder on that or any other large solder joints which may be cracked or broken.
Use standard precautions when working around high voltage.