Z5200 not printing all colors

[Broken_5200]

I have a Z5200 designjet that will not print the correct colors. When I print a diagnostic print the light magenta/light cyan and photo black/light grey will not print.  I have replaced the print heads and ink cartridges it did not resolve the issue. When I try to calibrate the printheads I get an error message "calibration cancelled due to scanning problems". Please let me know what you think will help resolve my issue. Thank  you!

[D Hook]

After changing printheads/cartridges, are you able to print the diagnostic page again to see if the new heads are working?

[Broken_5200]

" After changing printheads/cartridges, are you able to print the diagnostic page again to see if the new heads are working?"

           - The printheads will still not print the colors. I have tried to align the printheads and the scanner consistently has problems. I'm wondering if it can be fixed at all.

[Broken_5200]

After attempting to do a EEROM reset the system stil has a calibration cancelled due to scanning problem error message. I have used different ink cartridges and printheads what else can I do to resolve this issue?