Audio Shelf Systems
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Generic problem for all Audio Shelf Systems

No power!




By phil16v on Aug 23, 2009

" "
The unit blew the 2.5A fuse on the PSU board in the subwooker. A replacement blows instantly. I can't find anyone who can supply a manual / circuit diagram.
Comments:

Aug 23, 2009

- It's a Hitachi AX-M128. The fuse is one of 3 in the low tension side of a toroidal transformer. The transformer has two windings, one with a centre tap (and heavier guage wire), and another with wire that looks like 16/0.2. The fuse is in the second (non-centretapped) winding. I guess that the centretapped winding supplies the power amplifiers, which are located in the subwoofer, and the second winding powers the head unit which contains the DVD drive, the display, the video outputs and the controls. Without the head unit plugged in, there is no measurable short to ground. Unfortunately, I have run out of fuses to do any more tests with!

Clarification Request

Posted by palaboy on Aug 23, 2009

hi, please indicate the make and model of your unit, maybe, shorted load after the fuse or other electronic components. or try identifying what is connected after the fuse, is it a transformer type?

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