82143A Printer Issues

[morrerw]

Hello! I recently purchased an 82143A printer for my 41CX's (two halfnuts, one fullnut). An unusual thing happens when I connect the calculator to the printer in Trace or Norm modes. A line of asterisks prints with every calculator keystroke, regardless of which calculator or calculator port is connected. The calculator detects the module in the port when I execute CAT 2, so I'm guessing this is an issue with the cable between the module end and the board connection. I've downloaded the Service Manual, but this particular issue doesn't seem to be detailed within it. I'm a novice to this equipment, so I am hoping someone on this board might have some insight (maybe a way to check the cable without the ET module?). I've attached a picture of the printout to this post.