so I have a GQ-4X and it has worked great so far. I have done about 40 used eproms so far and they work great. just the other day I got 24 new FM27c040Q in (B0206AB FM27c040Q 90) and they blank check alright, they write with no errors but always fail verification almost instantly. I have tried using FM27C040 and just the generic 27c040 with no luck, same result.
Does the Q matter or change the device type at all? there is no FM27c040Q in the choices, the closest is FM27c040
Does anyone have any idea how to fix this? kinda annoyed that the only new chips that I decide to use arent working but the many random used chips I pulled from boards are working fine
I looked in the datasheet and Q is the package type, it stands for "Quartz-Windowed Ceramic Package". For programming, the package doesn't matter.
Not sure what else I can advise, I haven't used a GQ-4X. If it's in the listed of supported parts, then either the programmer is bad, or the chips are bad. Try a Google search to see if anyone else has had trouble programming them.
Memblers wrote:
I looked in the datasheet and Q is the package type, it stands for "Quartz-Windowed Ceramic Package". For programming, the package doesn't matter.
Not sure what else I can advise, I haven't used a GQ-4X. If it's in the listed of supported parts, then either the programmer is bad, or the chips are bad. Try a Google search to see if anyone else has had trouble programming them.
Thanks for that info. I already tried for quite a while and couldn't really find anyone having the same issue. if there any tests I can do to determine if its the programmer or the chips that are bad?
Does the programmer have some sort of self-test you can run? Or a testing mode where you can manually check the voltages (I know the Willem programmers support the latter).
Datasheet says VCC must be 6.5V, and VPP 12.75 during programming, you can test that with a multimeter while it's programming.
To test the chip, you could see if the programmer can read the manufacturer ID code from it, but I have no idea if GQ-4X supports that. Otherwise, the only thing I can think of would be to give them to someone who has a different programmer that's known to support that part.
Memblers wrote:
Does the programmer have some sort of self-test you can run? Or a testing mode where you can manually check the voltages (I know the Willem programmers support the latter).
Datasheet says VCC must be 6.5V, and VPP 12.75 during programming, you can test that with a multimeter while it's programming.
To test the chip, you could see if the programmer can read the manufacturer ID code from it, but I have no idea if GQ-4X supports that. Otherwise, the only thing I can think of would be to give them to someone who has a different programmer that's known to support that part.
I finally got it to work by using the default FM27C040 setting but at -2 speed. which sucks because it tooke about 70 mins to write