[time-nuts] E1938 question

Bruce Griffiths bruce.griffiths at xtra.co.nz
Thu Jun 11 19:36:12 EDT 2009


Dan Rae wrote:
> I have one of the "Chinese" E1938 modules I bought about a month ago. 
> I just tried it out on the bench, and have not had much luck with it. 
> The 5 Volt supply never goes above 50 mA or so, none of the heaters
> seem to be powered looking at the "hockey puck" D-sub connector pins. 
> The four leds up by the PIC (?) seem to flash once on switch on and
> then pulse about once a second.  The other led which seems to be on
> the 5 V supply is on.  It does oscillate, but very low since it never
> warms up.
>
> Is there any point in my trying to go any further with this?  It seems
> pretty dead to me, the PIC maybe?   :^(
>
> Nice museum piece perhaps, but a bit expensive for only that...
>
> Dan
>
> ac6ao
>
>
>
>
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Have you checked that the outputs of all the regulators on the board are OK.
In particular the -5V rail used by the heater PMOSFET driver opamps?

Bruce




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