Now I have the part about 3 weeks, and from the bass enclosure sounds a buzzing sound as the razor: hum, even if the table controller is switched off. It's only rest when the power switch is turned back on the device. It was clear that as a humming transformer. So open device back and inspected the transformer, which is screwed on the base plate. The transformer is supported by a 'sheet metal shell'. In this shell of the transformer sits not play. The hum problem seems to be known, because the metal shell has on the top of many small dents 'reworking' on. Also, a screw was screwed between the transformer and the base plate has been screwed into the slot, probably to more 'pressing' to achieve. After I removed the transformer, I opened the sheet metal jacket to 4 metal tabs and took out the transformer. With hot glue on all 4 sides, I have the transformer again stuck in the sheet metal jacket and closed the metal tabs again. Instead of the sponge rubber I the transformer now glued with hot glue to the bottom board and screwed again. Connecting cable, screw case back again. Peace!
Another tip: The back of the case, I got on relatively easy, as I unscrewed the original screws a few turns in the existing holes and then alternately put on the screws.
