Clogged inkjet ports on an hp psc 750xi

UNCLOG INKJET PRINTHEAD NOZZLES
Soak the printhead in hot water ! It works !!
_submerge printhead in aprox 0.1 inch water in plate
_hot water from faucet.... heat plate and water in microwave
_do not exceed 160 F or too hot to touch
_soak until ink comes out in water...
....usually a minute is good enough...sometimes 15 min
.....if it works and then goes dry soak some more

ALSO
CHECK THAT THE CARTRIDGE HAS INK by postal scale weight or by feel.
Compare to known full and empty carts....ink is about one ounce
and empty cartridge 2-3 ounces.
RESET REFILLED CARTRIDGES
Google search: reset C6578 and reset c6615 and find
http://www.refill4.com/refillinstructons/hewlett-packard.htm
If this donotwork search and try the other resets.
RESET THE PRINTER'S MEMORY FOR THE USED CART
I am still trying to find an effective way to reset the printer memory..
....'maybe remove the CMOS battery on the pprinter board
if I can figure out how to get at it.

Are there screws or other means the print head is attached to the rail? How do I disengage the print head?