MCUmall EPROM BIOS Chip Burner Forum
MCUmall EPROM BIOS Chip Burner Forum
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 True USB Willem Programmer (GQ-2X,3X,4X & GQ-4x4)
 Failure writing AM28F020

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T O P I C    R E V I E W
chykn Posted - 02/22/2007 : 22:12:10
I received my GQ-2X this evening, but when I try to write to a couple different AM28F020 chips, I keep getting the same errors...

USB device error in USB Write Thread!
USB read failed. Error # = 23.

I've also tried hooking the programmer up to a different computer and using a DC power supply - same results. The jumpers are in the correct position as shown after selecting the device in the app. Running v1.08, also tried v1.10.

Anyone seen this before? Thanks!
2   L A T E S T    R E P L I E S    (Newest First)
ZLM Posted - 02/23/2007 : 00:57:48
Did you try on a lower speed?
Or
If possible, please try on a good USB cable(Strong and short).

Also, please take a look on the programmer board. At the right side of USB connector, there is a 220uf/6.3V radial capacitor(just left side of U14-pin 3 ). Check if it is a real 220uf capacitor.
chykn Posted - 02/22/2007 : 22:22:28
I forgot to mention what the programmer WILL do. It WILL read/erase a whole EEPROM without issue. After a failed write, I can go back and see where it wrote the first 32 or so bytes them died out. The rest is blank.

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