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Re: Working on the HV Section of a 533A


 

Jeff-
working on older parts the oxide on the leads impedes "solder-ability", so just a gentle cleaning. scotch-brite(red/green/grey), I use whatever is nearby (green/grey at the bench).
Re the tips they do go bad with time/use I would run with the screwdriver, the long conical generally does not have the mass to do fast transfer of heat. it is not so much the temp ( to a point) as is the quick heat/in&out, try the 800 it may work but beware of burning the rosin. too much heat is just as bad as not enough. Those high temps were not allowed ( and for good reason) to be found in the rework area or at our engineering benches the govt oversight would have a fit, I caused enough grief with procedures that got things done and fixed properly before my ECN could be approved. I hid most of my unapproved tools 99% of the time.
I like the Weller gun for tip interchangeability and one could shape the tip as needed. they are not ESD safe! as you know every tool has its applications and limitations. ( they are inexpensive now days ~$5 used at garage sales etc...best one has nuts to hold the tips but beware of stripped threads...they kept making modifications to the attachment point until it worked poorly )
¸é±ð²Ô¨¦±ð

On 7/20/21 12:15 AM, Jeff Dutky wrote:
¸é±ð²Ô¨¦±ð,

What I've got is a Weller TC202 with a TC201P iron that I inherited from my father, with three tips (long conical #8, screwdriver #7, and narrow screwdriver #6). From a Weller tech sheet I found online it looks like these are 800¡ãF, 700¡ãF and 600*F respectively. I was using one of the screwdriver tips when I was having trouble with the ceramic strip, so I should try the long conical tip instead (which will let me get into the terminal slot better than the screwdriver tips did. I was using them because I had heard that the broader tip transferred heat better, but maybe an extra 100 or 200 degress is worth more than surface conduction).

I should also order a few extra tips: the ones I have belonged to my father and date from some time in the 80s, and they already had a fair amount of use when they came to me.

I'll be sure to get myself some scotch brite pads too.

-- Jeff Dutky




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