In article ,
jakdedert wrote:
James Sweet wrote:
Most of the busted speakers I've seen had mechanical problems.
Banged the volume control and broke it.
Banged the signal conector and broke it.
Dropped and cracked the circuit board.
You need either an oscilloscope or a signal injector.
mike




I don't think I've ever used either to repair speakers, usually the problem
is pretty apparent once you get it apart. A walkman is useful for supplying
a signal though, a DMM is usually sufficient for tracing.


A *finger* is often enough to supply signal (although the walkman is
higher-level, more stable approach). Touch an input and listen for hum.
Another (working) powered speaker is useful as a signal tracer
(protect the input with a small capacitor).

A DMM 'good enough' for the above can be had for $10 or less, and will
come in handy in many other situations.

Thanks, I think that might be the safest initial move. Remembering that
one of the pins also supplies POWER to the control pod, I figured I'd test
things out with a DMM first, and cross off any pins that have voltage
coming out of them.

I've looked around and Logitech seems to have refused previous requests
for pinouts of the input connector; though some have disassembled the
subwoofer to fix internal rattles, nobody has bothered to map the input
port. Opening this thing is such a bear that, given the choice, I'd throw
it out rather than invest that much time if poking around from the outside
doesn't yield anything.

Thanks for the ideas, folks.