All Forums  MCUmall Forums  True USB Willem Programmer (GQ-2X,3X,4X & GQ-4x4)  27C256 write problems

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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by circuit[/i] [br]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 [/quote]    Insert an Image File Check here to include your profile signature.