I've fixed over 100 of these beasts, hope i can shed light for you all ;-)
The flashing LED indicates the power supply rails (+28v and -28v) are being pulled down to 0volts by a (typical) fault on the amp board, usually means the amplifier chip has faulted (usually the LF amp, but on occasion can also be the HF amp).
Locate the 3wire(red, black, brown) connector that goes between the amp board and the larger power-supply board and disconnect it at the power-supply end. (it's actually hard-wired on the amp board end).
Now switch on the Amp, the LED should now be stable, which has proven you've isolated the fault.
Order a replacement board from Mackie, the part number is on the PCB. From memory it's something like "002163-00" or something, but now you know what the part number will look like.
Depending what country you're in, Amp boards are around $100.
I had that problem . I got the schematics and started checking volatges etc. After taking the sections apart, and reconnecting all, and resoldering connections between boards, the speaker worked again for several hours. sad to say that when i brought it to a gig, it just flached the LED again, no power. I will take it apart again. I won't be defeatedI had that problem . I got the schematics and started checking volatges etc. After taking the sections apart, and reconnecting all, and resoldering connections between boards, the speaker worked again for several hours. sad to say that when i brought it to a gig, it just flached the LED again, no power. I will take it apart again. I won't be defeated
Answers & Comments
I've fixed over 100 of these beasts, hope i can shed light for you all ;-)
The flashing LED indicates the power supply rails (+28v and -28v) are being pulled down to 0volts by a (typical) fault on the amp board, usually means the amplifier chip has faulted (usually the LF amp, but on occasion can also be the HF amp).
Locate the 3wire(red, black, brown) connector that goes between the amp board and the larger power-supply board and disconnect it at the power-supply end. (it's actually hard-wired on the amp board end).
Now switch on the Amp, the LED should now be stable, which has proven you've isolated the fault.
Order a replacement board from Mackie, the part number is on the PCB.
From memory it's something like "002163-00" or something, but now you know what the part number will look like.
Depending what country you're in, Amp boards are around $100.
Enjoy!
This probably means there is a failure and the internal protection circuits have activated. It will probably have to go to a shop for repair.
I had that problem . I got the schematics and started checking volatges etc. After taking the sections apart, and reconnecting all, and resoldering connections between boards, the speaker worked again for several hours. sad to say that when i brought it to a gig, it just flached the LED again, no power. I will take it apart again. I won't be defeated