Oddly, printing to hard copy worked just fine.
After troubleshooting for months, fruitlessly (the problem went away for about 3 months for no identifiable reason), the fax printer started to make an unusual tone instead of the standard keypress tone. I therefore suspected hardware, as I should have done months ago. So I trucked in the home device, identical to the work device, and swapped 'em.
Of interest: the home device was a replacement. The original had to be replaced because of hardware failure: quit powering on a week after I received it.
The offending devices were all Hewlett-Packard LaserJet nf2727 models. 2 out of 3 defective. That is not exactly a great track record, and earns Hewlett-Packard the title of producer of Terminally, Utterly Broken Pieces of Garbage-Shit.
I was surprised. I've had HP printers for years and nary a problem. I used one HP printer for 14 years and it was flawless until I could no longer justify buying new USB to parallel interfaces for it anymore. Should've kept it.