Re-soldering a cruise module
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I would like to re-solder my cruise module on my '87 auto.
My question is how do you remove the "plastic" coating over all the solder joints or do you just try to solder through it?
My question is how do you remove the "plastic" coating over all the solder joints or do you just try to solder through it?
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Some say you are supposed to remove it, however I resoldered without doing so and it worked fine.
Done three so far and all succesful.
Done three so far and all succesful.
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
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I used Berryman's B-12 chemtool. Be very careful to keep it off of the components on the back side of the board. You'll also need a stiff plastic brush.
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I carefully scraped the coating off after loosening it with something but I don't remember what it was...and don't dare guess in case I'm wrong.
Harvey
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Roger... that 'film' is a conformal coating, probably
(polyvinyl alcohol) PVA. It is used by circuit board
makers to protect against damp, moisture, fungus,
dust, etc. It also gives some vibration protection
too. Reliability, you see.
Some of our Boeing electronics/avionics use a coating
so tough you need a sawzall to get through it. Nearly.
G'luck.
(polyvinyl alcohol) PVA. It is used by circuit board
makers to protect against damp, moisture, fungus,
dust, etc. It also gives some vibration protection
too. Reliability, you see.
Some of our Boeing electronics/avionics use a coating
so tough you need a sawzall to get through it. Nearly.
G'luck.
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Some vendors apply the film to both sides of the board, i.e.
over the solder on the 'backside' (doesn't apply to my board,
nor yours, apparently) (some use a 'lacquer')
so must remove it to resolder. Sometimes a component must
be removed/resoldered so must remove it then on the 'front'
side. oh, a disturbed film shows that it has been tampered
with, so warranty is out the window. Not our problem, eh?
Depends. If you don't need to get through it leave it be.
G'luck.
over the solder on the 'backside' (doesn't apply to my board,
nor yours, apparently) (some use a 'lacquer')
so must remove it to resolder. Sometimes a component must
be removed/resoldered so must remove it then on the 'front'
side. oh, a disturbed film shows that it has been tampered
with, so warranty is out the window. Not our problem, eh?
Depends. If you don't need to get through it leave it be.
G'luck.
Last edited by macreel; 11-09-2006 at 06:30 PM.
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Roger, at least in my case, I could not solder with the coating in place. I did try, hoping that I wouldn't have to strip the coating off. Either my iron wasn't hot enough or it's a different coating. I wouldn't want to use a hotter iron though, that carries additional risk.
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Hi Dave,
I used a fairly low wattage iron. The coating did not seem to give me a problem.
I tended to concentrate on the moin soldering points closer to the connection point to the wiring loom and that did the trick.
All so far have come back to life perfectly.
Thanks,
Roger
I used a fairly low wattage iron. The coating did not seem to give me a problem.
I tended to concentrate on the moin soldering points closer to the connection point to the wiring loom and that did the trick.
All so far have come back to life perfectly.
Thanks,
Roger
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If your method works, don't mess with it. The guys here in the electronics shop tell me that if you don't take it off it can mess up solders. Obviously, this is not always the case.
Harvey
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Steve J... cruise brain is under central console, between radio
and firewall, bolted to tunnel. One connector to undo. Remove
passenger map shelf and console panel. WSM vol.1A, sect.27
G'luck.
and firewall, bolted to tunnel. One connector to undo. Remove
passenger map shelf and console panel. WSM vol.1A, sect.27
G'luck.