Ian P wrote:

"Grant" ? wrote in message
...
? On Thu, 29 Jul 2010 15:17:56 +0100, "Ian P" ? wrote:
?
??In the course of doing some modifications to a very expensive Sony 3 chip
??HD
??camcorder I have accidentally cut through 3 tracks on the edge of a mylar?
??flexible cable. On the good side the damage is very accessible but the bad
??bit is the tracks are only 0.1mm wide on a 0.2mm pitch! Ideally one would
??just replace the flex pcb but in practice that would involve dismantling
??the
??camera and lens to get to all the places the pcb branches out to, and in
??some places it actually goes into the lens mechanism itself.
??
??I am considering abrading off the top mylar coating to expose the copper
??then bridging the breaks with some very narrow pitch zebra strip. My other
??idea is to make my own miniature insulation displacement/piercing
??connector
??using a stack of razor blade bits sandwiched with insulation layers.
??
??The last option would be to use wire links and solder but I think this
??could
??only be done with some sort of mechanical micropositioning rig in view of
??the small sizes involved.
??
??I would be interested to hear any thoughts or experiences if anyone has
??any.
?
? I feel for you, it's a serious oops moment to recover from.
?
? Contact Sony for an idea of cost of fix, so you can place importance
? of fixing yourself in your mind? If you can afford the fix at least
? there's a way out.
?
? You've got stuff to practice with, but I can't see how you're going to
? reliably connect to that fine pitch. Are there accessible places where
? the cut tracks get wider? Do the cut tracks terminate to accessible
? places where you can create another, separate cable to bridge the
? breaks?
?
? IOW, sidestep trying to repair the damage by creating an alternate
? circuit.
?
? Seems to me it's a cable replacement, but that could be sub-assembly
? replacement if the flex also gets glued in place to some smaller parts.
?
? Take it easy, it is not a rush job.
?
? Grant.

The subassembly in question is the lens. Parts of the cable are wrapped
round and glued to the lens body, and the only way to access it is to
completely dismantle the bulk of the camera, more or less reversing the
original manufacturers assembly procedure.


Look for a dead unit on ebay for parts.


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