HP-19C Printer

[jjohnson873]

Hi Tony....I was going to suggest replacing the motor capacitor, but you're already onto that potential problem.
As stated earlier, there is no paper out detection on the HP-19c.
It's odd that an "ERROR" is displayed when trying to print. I can't say that I've seen that in any of my HP-19c repairs, unless the battery voltage is low. Are you running on a bench power supply or batteries?
At least you've gotten the mechanical portion repaired with the replacement of the spring in the lateral helix printhead mechanism. Once the motor starts, it will drive the print head back and forth, searching for the home position.
I've also noticed that the print head ribbon cable can get jammed if it's not routed correctly. It needs to move freely, or it can catch on the pc board.
Interesting that the motor just doesn't start at all. I'm baffled at what is causing the "ERROR" in the display. Is there excessive current drawn when you execute a print command?
There is a small drive train inside of the motor housing. I've noticed some motors can be a bit dodgy if that drive train is dirty. But I wouldn't put that issue at the top of your troubleshooting list.
Let us know what you find in your testing. ~ Jim J. ~