Serial Programmer dead
Greetings list,
I am using the MElabs serial programmer. It worked great for years, until I plugged it in this morning. No green light. I checked all power connections and regulators, but it all tests good. I also get a "no communications" box from the PC I am working with.
Other than an 18F252 that decided to stop working, any ideas for trouble shooting?
Thanks,
Ron
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How about the Crystal?
Q1, Q2, Q3?
Possible to have a faulty DB9 cable?
Possible to have some break-link between the DB9 and the circuit?
Broken pins on the dip socket?
Last edited by mister_e; - 16th October 2006 at 14:54.
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
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Do you have a way to check the com port? You might have a bad port.
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Or may be they inserted a secret timer/counter inside the programmer to terminate the life of it; and now it is time to buy a new one.
I am a great conspiracy theorist!
"If the Earth were a single state, Istanbul would be its capital." Napoleon Bonaparte
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Sorry, I haven't checked the list in a few hours. I replaced the crystal, and checked the com port. I normally get the green light on power up whether it's hooked up to the PC or not. Does the chip do a diagnostic on the transistors on power up?
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Otay... I spoke to Charles at MElabs. He told me that occasionally, the PIC252 just goes astray. About a dozen have, with no aparent cause. I ordered another chip and will update the list if this works. The board is so simple, I can't believe that it won't.
Thanks for the input,
Ron
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