On Wednesday, February 26, 2020 at 11:54:07 AM UTC-5, three_jeeps wrote:
On Wednesday, February 26, 2020 at 11:24:09 AM UTC-5, wrote:
Thanks Wieck, for your insight. Optical sensors are clean, and no error code reported. Though MP feed solenoid won't energize thus no paper pickup from MP tray with error Tray 2 Jam error when print attempted with paper in Tray 1.

not sure how to parse the last sentence. Is there a period missing?
Though MP feed solenoid won't energize thus no paper pickup from MP tray with error. Tray 2 Jam error when print attempted with paper in Tray 1.

If parsed this way, seems that cpu is confused about status/state of paper trays.....so check the tray sensors.
A HP service manual would be very helpful....do you have one?


forgot to add: you say solenoid checks fine on external source...did you check the solenoid signal path?..Signal present but not getting through?