[time-nuts] DataChron 3070 Question

[Mitchell Janoff]

I have a DataChron 3070 Time-code Generator that I want to use as a time
display and time-code generator. It has an external frequency input, but I
can't find any switch that would allow me to turn off the internal
oscillator and use an external supplied frequency. It has switches on the
front panel to switch between an internal time-code and an external
time-code, but no switch for the frequency standard. I've tried locating a
jumper or switch inside, but there are boards on top of boards and I don't
want to start taking it apart unless I know that there is a switch or a
jumper on the bottom. Anyone have a manual or one of these units?

Thanks for your help.