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circuit
Lithuania
21 Posts |
 Posted - 04/30/2009 : 04:12:23
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I am using GQ-3X Re-1.20 to program lots of M27C256B-12F1 (made by ST) EPROM chips.
Problem is that it started to fail during writes more and more often. Currently it programs only ~20% of chips without errors. Most often it fails on address h0800, but addresses differ. It does read them correctly, though.
I have resoldered all of ZIF socket DIP pins, ensured that there is a good contact between chip and programator's board. And it still ens up with errors. I have also tried to connect a 2.2k resistor between GND and OE pins of M27C256B-12F1 - no luck.
I have checked that it supplies proper Vpp and it was correct - around 12.7V.
I can't work with it anymore, work is at hold, and my boss is angry as hell.
What can I do about it? If you need more information, just ask.
I use newest available software and driver. OS - Windows XP professional x64 |
circuit.lt / e-motion.lt |
Edited by - circuit on 04/30/2009 04:13:47
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27C256 write problems
