Help with 41CL and printer

[twoweims]

I have just completed an installation of a 41CL board.
Everything seems to work fine so far.
I am able to plug and unplug modules and they work OK.

I have YFNZ plugged into port 1L per the instructions.

My 82143A Printer only works when plugged into port 2.
It prints garbage when plugged into port 3 or 4.

I am just getting started with the CL so it must be operator error.
Any troubleshooting wisdom would be appreciated.

Thanks