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three_jeeps three_jeeps is offline
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Default HP LaserJet pro 400 series; solenoid won't energize.

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?