While in the process of doing the mod to the prom carrier, I was informed by an associate that I shouldn't use an AC type soldering iron as it might damage the internals. Any truth to this or just another wifes tale?

Don>>>

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[This message has been edited by Dyno Don (edited March 04, 2001).]

 

you should only be usins a 15 watt MAX soldering iron, and in that case, no problem. If you were usung a large pistol grip type 150+ watt gunn (TV degauzer)and held the coil right next to the device for like 20 years you MIGHT see a bit +-. point is most of these new devices well take a lot of punishment.
Mike


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I tried to look at the pictures in Traxion's article, but I kept getting a forbidden error from the server. I put in a ZIF socket, but I just couldn't see how I was going to solder in the socket when it was resting flat on top of the calibration module. I finally settled on the following:
Instead of desoldering the EPROM, I just cut all the legs off (eproms are cheap, so I didn't care if I wasted one).
Once the body of the chip was off the module, I removed the legs with a touch of the iron and a pair of needlenose. After I had all the legs off, I melted a strip of solder across the top of each of the 28 insert points for the legs.
I took the zif and placed it on top of the module and used a 2 stage heat gun on high to heat up each side of the module and zif.
When the solder started to flow, I pressed the zif into the solder bed with a wooden stick. Now the zif sits flush on top of the module, and I have a nice strong solder joint on each leg.I metered each connection to make sure there were no shorts and that I had continuity an all the connections.
Make sure the zif you are using is made out of the same high temp plastic as the calibration module, or else you end up with a mess - ask me how I know

I didn't have a low profile zif handy, so my prom sticks up an eighth inch above the case, but I used a couple of standoffs on the ecm prom cover so it now does double duty to keep the whole module secure in its socket.

Now I gotta learn how to program the chips - I am much better at the mechanicals than the mathematicals...

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