How to fix a canon Fax L90 Paper jam

SOURCE: Prints without any errors but no ink on the paper.

if you have new print head assembly and cartridges, and waited for flow, and the printer is MECHANICALLY sound (not dropped or G-force damaged), then all that is left is improper cartridge installation. You may not have the cartridges fully inserted/, or maybe they are not PROPERLY inserted. Look for a snap when in place (and no wiggle). I suspect this is your problem, because one symptom you mention, ink accumulation INSIDE the head/cartridge cradle, is VERY rare -unless the cartridge is inserted improperly. The cartridges/head assemblies have VERY good seals to prevent leakage. Unless the o-rings/seals are damaged, leakage outside the seal just does not happen at all, normally.

*New head/cartridge installs can take several hours -sometimes even a day in cold weather, for small iP90-like printers to saturate the heads -and print.

SOURCE: Canon B820

please confirm that no foregin object droped inside like (stapler-pins)--confirm that paper jam switch in good condition and it is lever not broken and can move in free motion.-chek for small pieces of torn paper and clean the paper path.

SOURCE: Canon Laser Class 2060 P Super G-3 Fax

were do i find parts

SOURCE: canon Fax JX-500 will not print any faxes

Just press the on/off button once this should do it.

SOURCE: Canon MF4150 Duplex Printing Paper Jams

I have just had the same problem on one of these Canon MF4150 machines.
The manufactures warranty on our machine had expired just one week before this happened so I had to fix this myself.
The problem we had (which is very likely to be the same cause as yours) is when we removed some torn jammed paper, it had somehow pulled off a spring from inside the machine. The spring was linked to the paper jam sensor.
It does involve a LOT of work to fix it, and unless you are very 'techy' it may be quite a difficult task to do this for the 'average' person.
I had to completely disassemble the machine: Take off the front first (lift up the cover and there is 2 screws at the front and 2 clips on the bottom of the machine) Then remove the 2sides and finally the top (screws should be easy to see, to get the sides off, un-clip along the front edges and gently move them outwards and slide them backwards to release the clips on the back) being careful with the wires going to the scanner part). Then look for the fuser unit which is near the top at the back, there is a black rounded cover over the fuser. To remove the cover, look for 2 small clips one at each side and unclip the cover and gently lift upwards.  Under the cover on the left side you will see a small plastic rod which goes from the left side to a small tab in the middle, if you look about half way along that rod you should see a tiny spring, make sure this is clipped on properly and that you are able to rotate the rod and it should spring back to the proper position when you let go.
Once this is done, put it all back together again and it should work fine.

I'm sure a lot of other people probably have this same problem too so I hope this helps someone.