Hello Everyone! I have a Yamaha powered speaker DXR15. The problem was the RED LED Fault indicator is steady on when I power the speaker. I did open the module and I don't see any burnt component. I Downloaded the Schematic but I don't know where to start the diagnostic. Any help would be greatly appreciated. I also attached the schematic here
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Well, start with the power supply - page 99 -> +/-VB, VDR, +VS, +/-18A, +5V. Check if all that power rails are present. Then check the DSP board and see if the +/-15, +6V, +5 and +3.3 rails are generated. -
Thank you! and found that Q107 was shorted to ground. I order the replacement parts and I will update soon once I get the parts.Last edited by MobileXT; 01-23-2025, 10:31 AM.Comment
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Update: After replacement of the Q107 still have the same issue Q107 still getting hot from the infrared camera. Q106 is not shorted, I Removed Q106 and there's no reading on the diode mode drain and source. Testing D10 with Diode Mode seems like D104 is not shorted.Last edited by MobileXT; 02-08-2025, 09:52 PM.Comment
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If you have a red LED or indeed any other LED, then you have +5LD rail, +6V, +18A and DC+25V power rails, all of them are on the secondary/low-voltage side of the power supply. This most likely means that the primary side is working.Comment
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That’s good to know, I will concentrate on the secondary or the amp output. Thanks for the tips.Comment
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Hello everyone.
I need help with my Yamaha MSR400 - Powered PA Speaker that I bought it used recently.
It is power on, and sounding good / working perfectly fine. However after 3 - 5 minutes, the heatsink is starting to get warm, and it smells burning a little bit.
I did tried multiple times on different day, event the speaker is not playing any song (input does not connect to any source, and the volume level is zero), after it turns ON, 5 minutes later, the heatsink is starting to get warm, and it smells burning a little bit. I am afraid keeping it ON longer than 5 minutes... -
So I didn't realize there was a tiny written warning on the speaker impedance switch on the back that said moving the switch with the power on "may damage the unit". I actually switched it multiple times, listening for any possible audible changes. It wasn't until later I saw the tiny warning. I haven't noticed any issues though. Can someone please look at the schematic and tell me what damage I may have caused? Thanks!!... -
Does anyone happen to have a schematic for the amplifier for an Electro Voice SXA series 100 or 250 powered PA speaker? -
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