MCUmall EPROM BIOS Chip Burner Forum
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 Using The Enhanced/Dual power Willem Programmer
 27sf512 read ok, blank check ok, wont program
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6 Posts

Posted - 11/10/2006 :  10:11:55  Show Profile  Reply with Quote
I've had this programmer for a while and it has worked flawlessly.

Today, I started having problems. On two chips, one brand new, it will erase, blank check all fine, but when I program , it goes to 100% and says: Error at 0x000000 Chip = 0xFF buffer = 0x14

I can do another blank check and it comes back Device is Empty. I can do a read, save it, and open in hex editor, all FF's.

Up to this point I have never had problems with it.

Where can I find info on performing the hardware test. what pins to check for what and so forth?

Reply #1


6 Posts

Posted - 11/10/2006 :  10:53:27  Show Profile  Reply with Quote
hardware test. not sure i'm doing this right

Jumpers set as pictured on Test H/W tab

DVM Negative probe on pin 16 GND
DVM Positive probe testing other pins

ALL Pins working

VPP 12.63v
VCC 4.88v
ALL A pins 4.26v
ALL D pins 4.26v
OE-24 4.26v
CE-22 3.65v

theese all seem ok
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Reply #2


6 Posts

Posted - 11/16/2006 :  19:59:58  Show Profile  Reply with Quote
anyone have any ideas? someone's gotta know?

When I set jumpers for SST27SF512, and the chip installes towards bottem of zif socket, the jumpers would move the VPP to a different pin correct?

which pin would this be?
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Reply #3


2942 Posts

Posted - 11/17/2006 :  03:18:19  Show Profile  Reply with Quote
All seems fine.
Check the DIP switch see if any dip has contact issue.
Also check the pin contact with the ZIF socket.

The chip position in ZIF should be bottom aligned in the ZIF and pin 1 up.
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