MCUmall EPROM BIOS Chip Burner Forum
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 Using The Enhanced/Dual power Willem Programmer
 Blank check problem

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yorgle Posted - 06/07/2006 : 13:57:03
Every time I run a blank check I get the "Device is NOT empty" error even though I've tried 3 different 2732a eproms and the 27c32 that came with the programmer. I left three of them in direct sunlight for two hours and still get this error message.

Attempts to program also fail. Any suggestions?
4   L A T E S T    R E P L I E S    (Newest First)
ZLM Posted - 06/09/2006 : 00:22:43
Good try. Yes, it is possible to erase the EPROMs by sun light. But a completed erase all data in EPROM to 0xFF may take two years in sun light(not included raining days). A few weeks only make the data read un-stable. Indeed, you need a UV eraser to erase EPROMs.

Also, always do a blank check after chip been erased you believe. And do a blank check before the write operation. If the software shows not empty, then you need do the erase again.
yorgle Posted - 06/08/2006 : 08:37:16
Forget what I just said. According to the buffer screen, my 2732's ARE empty (all FF's). Somthing els seems to be the problem. I tried setting the vpp at 25v but get the same result: "Device NOT empty" when I do the blank check. Any ideas?
yorgle Posted - 06/08/2006 : 08:16:51
I'm using the Dual Power unit which specifically says it can program 2732 and 27C32 eproms. I believe my problem may be that I thought that the eproms could be erased by a few hours in the sun. I have since learned that it would take several weeks of sunlight to completely erase them. Plus, I may have fried the 27C32 when I tried it because the jumpers were still set for the 2732's higher vpp voltage. Live and learn, I guess.
ZLM Posted - 06/07/2006 : 17:01:14
The Enhanced willem programmer does not support 2732 and 27C32 EPROMs.

If you are using Dual power willem, then the jumper set need to be confirmed.

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