In Reply to: One tweeter out on IIIA - what are my next steps? posted by atkin11j@yahoo.com on September 22, 2010 at 16:01:16:
Let's not jump to conclusions since you're about to spend $200 to replace the ribbons.
First check the new fuse with a ohmmeter or at least try a second fuse. It's unlikely that the new fuse is bad but $200 is $200.
Open up the panel and check the connections at the fuse block - maybe there is a bad connection, including one that was never soldered. We have all heard stories of less than ideal QC at Magnepan.
Do the same at the connectors of the ribbon (remove the little Magnepan stickers at the top and bottom). When I replaced the wires on my IIIa's, I screwed up the soldering (ok, I'm not perfect)and there was a cold joint.
Besides visually inspecting the tweeter try attaching a ohmmeter to the top and bottom of the tweeter to see that it is not open (infinite resistance). Unfortunately some have found that the tweeter is a very good fuse protector.
"Our head is round in order to allow our thoughts to change direction." Francis Picabia
Edits: 09/22/10
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Follow Ups
- RE: One tweeter out on IIIA - what are my next steps? - neolith 17:42:13 09/22/10 (0)