MCUmall EPROM BIOS Chip Burner Forum
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 True USB Willem Programmer (GQ-2X,3X,4X & GQ-4x4)
 various problems		  New Topic  Reply to Topic
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foster

USA
18 Posts
Posted - 01/27/2007 :  04:56:41  Show Profile  Reply with Quote
today it is doing strange things

Prior good chips are showing up as being filled with wierd data
like all 00, 7f, etc. These are EPROMS that where known good eproms

and it seems to be damaging them.

I will need to put them in the device that they fit to see if they truely ruined.
Reply #1

foster

USA
18 Posts
Posted - 01/27/2007 :  06:48:02  Show Profile  Reply with Quote
Ok didnt think of that

Vcc LED stays off
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Reply #2

foster

USA
18 Posts
Posted - 01/27/2007 :  06:49:11  Show Profile  Reply with Quote
I also changed USB cables
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Reply #3

foster

USA
18 Posts
Posted - 01/27/2007 :  07:29:01  Show Profile  Reply with Quote
This is the USB version GQ-2X

No parallel port needed

Was working before
I was able to check some EPROM's last night.

the problem started earlier today
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Reply #4

foster

USA
18 Posts
Posted - 01/27/2007 :  07:35:07  Show Profile  Reply with Quote
I have also tried a different laptop and different USB cables.
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Reply #5

foster

USA
18 Posts
Posted - 01/27/2007 :  07:53:15  Show Profile  Reply with Quote
Yes software see's the device

No the Red LED stays off
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Reply #6

foster

USA
18 Posts
Posted - 01/27/2007 :  07:54:31  Show Profile  Reply with Quote
I am lucky the devices that I put in it are not dead
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Reply #7

foster

USA
18 Posts
Posted - 01/27/2007 :  08:28:30  Show Profile  Reply with Quote
I thought maybe the DIP SW was going bad, so I tested them with DMM
all when on test ok and all when off test ok.

where do I find info on what the switches do?
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Reply #8

foster

USA
18 Posts
Posted - 01/27/2007 :  08:41:12  Show Profile  Reply with Quote
Just for a check, only because i remember the 24C16 only needing one switch on
I set the device to 24c16 and had the programmer read an empty socket, i didnt get a red light
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Reply #9

foster

USA
18 Posts
Posted - 01/27/2007 :  09:08:52  Show Profile  Reply with Quote
tried a 27c512 read this time
No LED and no Vcc at Pin 28
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Reply #10

foster

USA
18 Posts
Posted - 01/27/2007 :  09:25:25  Show Profile  Reply with Quote
when I do a voltage test on one of the programmer's IC's the computer acts like the programmer was disconnected and reconnected
also the green light goes out while the test leads are connected
and no there is not a short in the DMM
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Reply #11

foster

USA
18 Posts
Posted - 01/27/2007 :  13:35:54  Show Profile  Reply with Quote
1.24 vdc diode left end
1.66 vdc diode right end
1.66 vdc or so at U3 pin 6
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Reply #12

foster

USA
18 Posts
Posted - 01/27/2007 :  13:38:24  Show Profile  Reply with Quote
oops forgot USB shows 5 vdc
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Reply #13

foster

USA
18 Posts
Posted - 01/28/2007 :  14:20:09  Show Profile  Reply with Quote
not sure of external power requirements
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Reply #14

foster

USA
18 Posts
Posted - 01/29/2007 :  20:53:14  Show Profile  Reply with Quote
I might have to try something then
I have ps about that size
I am assuming thats tip positive
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