Hello,
A friend borrowed my Alto TS112A speaker (Alto Professional - TRUESONIC Series > TS112A but the older model which only takes one input) and it broke during use. He reports that he was using a poor quality old DJ mixer and had the audio output levels constantly in the red, outputting a strong signal to the speakers for an hour before the audio cut out. I don't know if the signal limit warning was on or not. I assume this caused some damage.
I've got it back.
- The led lights are on when plugged in but no audio plays at all. - I assume it's not to do with fuses if the leds turn on (and I have checked the Fuse on the plug and where the power cable plugs - both appear to be fine).
- I've checked the 3 transparent fuses that are wired into the internal circuit boards also appear to be fine.
- The cooling fan does not run when I turn it on (but I guess this only comes on when they're being used to play loud music)
- I only have one speaker and I believe he was using a mono RCA to single XLR adapter - i.e. only playing the left channel of his stereo output.
So any ideas on what part(s) I need to replace to get this fixed? As it cut out suddenly I am guessing it's to do with circuitry as opposed the main moving parts of the speaker that create the audio.
I am experienced in repairing PCs and other electronics and am confident with a soldering iron if required.
Thanks so much for any help in advance!
Tom
A friend borrowed my Alto TS112A speaker (Alto Professional - TRUESONIC Series > TS112A but the older model which only takes one input) and it broke during use. He reports that he was using a poor quality old DJ mixer and had the audio output levels constantly in the red, outputting a strong signal to the speakers for an hour before the audio cut out. I don't know if the signal limit warning was on or not. I assume this caused some damage.
I've got it back.
- The led lights are on when plugged in but no audio plays at all. - I assume it's not to do with fuses if the leds turn on (and I have checked the Fuse on the plug and where the power cable plugs - both appear to be fine).
- I've checked the 3 transparent fuses that are wired into the internal circuit boards also appear to be fine.
- The cooling fan does not run when I turn it on (but I guess this only comes on when they're being used to play loud music)
- I only have one speaker and I believe he was using a mono RCA to single XLR adapter - i.e. only playing the left channel of his stereo output.
So any ideas on what part(s) I need to replace to get this fixed? As it cut out suddenly I am guessing it's to do with circuitry as opposed the main moving parts of the speaker that create the audio.
I am experienced in repairing PCs and other electronics and am confident with a soldering iron if required.
Thanks so much for any help in advance!
Tom
With unbalanced outputs the signal from that mixer may not have been that high but it was most likely badly distorted, but a well engineered powered speaker should not be damaged by this despite what it would sound like. I'd agree the amp module in your speaker is the prime suspect but a simple diagnosis will be difficult without another working speaker to take parts from... you may have to take it to a service center.
He also could have killed the speakers.
Open the cabinet, disconnect 1 lug and test them with a 9V battery , any clicks?
Or measure voice coil resistance.
Post a couple sharp readable gut pictures, specially the power supply and output transistors.
I have a couple Alto rack power amp schematics, maybe the power amp in your box (at least the low frequency one) is close enough to help in diagnosing.
The horn might be driven by a chipamp.
Read and post (or show a picture) of labels on PCB and power transformer, I guess Alto is just a distributor name and it's actually made by a giant OEM factory.
Lately I'm finding Soundking stuff all over the place, with different brands.
Open the cabinet, disconnect 1 lug and test them with a 9V battery , any clicks?
Or measure voice coil resistance.
Post a couple sharp readable gut pictures, specially the power supply and output transistors.
I have a couple Alto rack power amp schematics, maybe the power amp in your box (at least the low frequency one) is close enough to help in diagnosing.
The horn might be driven by a chipamp.
Read and post (or show a picture) of labels on PCB and power transformer, I guess Alto is just a distributor name and it's actually made by a giant OEM factory.
Lately I'm finding Soundking stuff all over the place, with different brands.
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