Head height & calibration issues sp-540v

I just replaced the print heads in my sp-540v and am doing the head calibration. When I do the bias calibration I will get different results (shifts) without even making any adjustments. Also when doing the bi- directional calibration I get a head height too high message. Went into machine setting and ensured that the head height was in low (which it is on the machine) not sure why my bi-directional calibration test print looks the way it does. I got a perfect test print for the heads. And horizontal test print looks good. Just not sure about the head height issue and bias issue. I have attached some images of my test prints.

Thoughts?

 

Thank you for the reply Joe!

Yes the spring is installed.

I have been adjusting the 1.5mm allen screw to set the head alignment. I loosened the three screws on the head by tightening them and backing them off just a touch so the head will move with adjustment. The interesting thing is the test prints above were all run consecutively with no adjustment in between test prints.

 

Thanks for all the great info! I just to eliminate and change due to movement I went ahead and tightened down both heads and ran two consecutive test prints without touching anything and got two different results. I attached a picture of both test prints. I also printed a printer report and the print quality was horrible. Lots of ghosting I am thinking that it may be that the encoder strip is bad. Can these be flipped?

 

Thank you I will have to check into the head height sensor.