[time-nuts] E1938 info regarding LEDs, push button switch and EFC voltage notation

Azelio Boriani azelio.boriani at gmail.com
Thu May 11 22:34:41 UTC 2017


You can find schematics and various info here:
<http://www.prc68.com/I/pdf/E1938pdfdocs.zip>
<http://www.prc68.com/I/HPE1938.shtml>
<http://www.leapsecond.com/museum/e1938a/>

On Thu, May 11, 2017 at 3:47 PM, James Robbins <jsrobbins at earthlink.net> wrote:
> 1.  I have just acquired an E1938 and powered it up.  It seems to work.   I
> see that it has 4 blinking board LEDs (green, red, yellow, yellow) and a
> pushbutton switch at the end of the board opposite to the DB25 connector.
> Can anyone point me to either the schematic for the board or what these LEDs
> and pushbutton show or do?
>
>
>
> 2.  Also, there is an "EFC" voltage ("3.69v") marked in magic marker on top
> of the can.  Can anyone point me to where I can learn what, if anything,
> this voltage notation should be used for?
>
>
>
> Many thanks.
>
>
>
> Jim Robbins
>
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