1270C

From: WB5OJW@WB5OJW.#AGS.GA.USA.NA

 
For all those that have recently purchased a MFJ-1274C or MFJ-1270C
for the purpose of running a TheNet or X1J node, using with a BBS
and the Nord<>Link TF4 type EPROM.

As produced, these units are not the same as the previous model that
carried a B at the end of the model number, ie. MFJ-1270B. They will
not function correctly as I so sadly found out after purchasing one
at a Hamfest this past weekend.

This pompted a call to the MFJ technical department which produced
an immediate solution to the problem. The technician (Stan) told me
that they had just become aware o this problem and he way to correct
it was to:
   1) Remove the IC U40. (CD74HCT374E)
   2) Ground Pin #16 of the IC socket.

  Save the IC for future use in case you want to use the TNC for normal
packet activity. To ground Pin #16 of U40, you can inert a small 
piece of solid wire (about the same diameter as the IC pin) between
pin #16 and Pin #1 (Ground) of the socket.

  This has corrected the problem with my unit and it now works as it
should. I was told hat MFJ is considering making this modification
a Jumper setting in future units.

73 Mike WB5OJW @ WB5OJW.#AGS.GA.USA.NA