Hello. A quick writeup on a powered 1000W speaker that came in this morning with no power. The GREEN power led was dark. Fuse was tested and found to be ok.
Removed the power supply / amp combination from backside of the unit for inspection. Started to test in diode mode for possible shorts on the board.
The cabling from the AC socket to the switch was failing but would work with some wiggling of the same cable (brown in our case).
Upon closer inspection, found that there is some factory applied black epoxy to secure the tabs in place? With some elbow grease and a pair pliers, removed the contacts on the AC socket for a closer inspection. The black epoxy effectively created an insulation barrier for the power path. Removed the dried up epoxy and sanded the contacts clean. Compressed the contacts a bit more for an improved friction fit. Reseated and rebuilt the unit and working like new. Plan B was to toss the unit due to the weight and gobs of black epoxy on the power supply and amp regions. Not practical to service the unit.
Pics are attached.
Note the black epoxy inside the power tab insulation (Brown cable)
Removed and sanded off the epoxy. Compressed the same mating contact connector for a solid mating contact.
Working!!
Removed the power supply / amp combination from backside of the unit for inspection. Started to test in diode mode for possible shorts on the board.
The cabling from the AC socket to the switch was failing but would work with some wiggling of the same cable (brown in our case).
Upon closer inspection, found that there is some factory applied black epoxy to secure the tabs in place? With some elbow grease and a pair pliers, removed the contacts on the AC socket for a closer inspection. The black epoxy effectively created an insulation barrier for the power path. Removed the dried up epoxy and sanded the contacts clean. Compressed the contacts a bit more for an improved friction fit. Reseated and rebuilt the unit and working like new. Plan B was to toss the unit due to the weight and gobs of black epoxy on the power supply and amp regions. Not practical to service the unit.
Pics are attached.
Note the black epoxy inside the power tab insulation (Brown cable)
Removed and sanded off the epoxy. Compressed the same mating contact connector for a solid mating contact.
Working!!
Attached Files
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