LaserJet 1606 dn duplex printing issue

[clueless_123]

When printing a 2-page document, my hp1606dn prints only page 2 if printing duplex (print on both sides)., and I get a blinking Attention Light. If I then press the Go button, it will print page 1.  A 2-page document will print both pages if printing simplex (print one side).  I am printing from MS Word, but it is the same regardless of the app I'm using.

A 1-page document prints if printing simplex, but if printing duplex it prints a blank page (page 2?). I can then print page 1 by pressing the Go button. 

I have not tested longer documents.

Any ideas are appreciated.

Thanks in advance.

I have done a hard restart (unplugging for a couple minutes) and a Restore Factory Settings.  Seems like a problem in the duplex printing, but I can't figure it out. 

[Valsimot · Accepted solution]

You need to check duplex settings on the device you are printing from. You are now using manual duplex, you need to set it to automatic.

[clueless_123]

Thank you. This seems to have solved the problem.