....Continuing on.
Today, I did further tests in the Service Calibration menu, "Drop Detector" and "Line Sensor Calibration to try and solve this issue of why some papers will calibrate
and other do not. The Drop Detector passed, however the Line Detector Calibration gave a error " Internal checks failed - Returned Error 1. I didn't have the
same paper as stated in the service manual, instead I used HP Premium Universal Satin Photo Paper 200gsm. (this paper the printer calibrates OK).
Would this paper be a likely cause of the fail or could it be the reason for the inconsistent calibration?
Thanks
-David
PS all the the colour patches are OK...ink levels and print head test all good
Line sensor can be replaced without taking the whole machine apart. It is the item with the (infra)red light at the left side of the head carriage. I would check the encoder strip first whether it is dirty, can be cleaned with glassex but be careful. HP engineers were probably smart enough to create a test method that distinguishes the flaws caused by the sensor or the flaws caused by the encoders but you never know to what degree that method goes.
I had something similar not that long ago, error 21:xx. Manual says service station not moving properly, something might block movements. May have been correct but it always started when the head carriage had moved about 10 cm from the station. Cleaned the service station, no item was blocking it and I made as much wet as possible on the sliding parts there. Cleaned the beginning of the encoder strip there too, usually the part that gets dirty faster. Noticed that the head carriage had more friction at the carriage rear bushing, neglected the oil sponge too long there. Oiled sponge and rear bushing. Kept the right side cover off and had the machine going again till I was sure the error did not appear again. The error may have been caused by the service station parts having too much friction but when the head carriage has a bad start moving to the left the engineers may have thought is was because the service station did not make the head carriage free fast enough ....... Speculative. I will never know what exactly caused it, solved it for the time being.
Better get a spare service station (universal for all 12 ink models I think) ready for the occasion I can not solve that error in a similar way.
Met vriendelijke groet, Ernst
http://www.pigment-print.com/spectralplots/spectrumviz_1.htmMarch 2017 update, 750+ inkjet media white spectral plots