AXE027 failure

[kenmac]

Hi Folks,
This is just to advise that my AXE027 cable has failed.
It was during a run of programming on a 08M2.
Everything was going OK when it suddenly stopped.
Previous to this, I haven't had any problem with it - always worked OK.
I checked the serial input line using the Test button under Options.
Normally when the Test is pressed you should see about +4.7V.
In this case it was seen to be -4.7V - opposite polarity!
So, something has happened to its USB interface.
I confirmed that the problem was in the AXE027 by using another AXE027, which worked OK.
Anyway, this is just to let you know of the failure - no help required really.

kenmac

 

[hippy]

It should not be electrically possible for the AXE027 to output a negative voltage and there should never be any negative voltage available via a USB port.

 

[bpowell]

Maybe if you managed to jam the USB connector in upside-down...

 

[Janne]

Hi,

Are you 100% sure, that you measured the serial in (data transmitted from axe027)? I just remembered an old problem I had with the axe027 cable. In my case it was possible to measure negative voltage from the serial out (data received to axe027) line in reference to ground prong.. I never replied to the thread with the solution, but I eventually found out the ground lead on my cable was broken. After reconnecting ground the cable worked but was kinda nasty with all the plastic cover chewed away

(my old thread; http://www.picaxeforum.co.uk/showthread.php?11267-USB-download-cable-problems-AXE027)

 

[kenmac]

Folks,
I'm happy that the failure wasn't caused by anything I was doing at the time.
Over the years I have seen many electronics items fail for an unknown reason,
so I will accept that it has happened, and purchase a replacement AXE027..
No further investigation is required.

kenmac