I have had three MX-5111 give the same issue with the same resolution. All 3 were running at least 10k color a month and had older firmware; version 7 or lower. When rendering the 64-5 printout, they always come out looking like the example below:
solenoid.jpg
Note that only yellow shows up with the exception of the bottom of the page.
The reason only yellow shows up is because it is closest to the LSU shutter solenoid, which becomes packed with toner mix due to dusting on older firmware versions.
To resolve this, first remove the LSU unit. On the rear wall you will see a solenoid that controls the LSU shutter. Remove the 2 solenoid screws, bend the bracket down, disconnect the harness and remove the solenoid. You will find a pile of toner mix packed into the plunger path. The presence of the toner mix prevents the plunger from fully opening the shutters.
There are several known Sharp shutter issues, but I had never seen that much inside that solenoid before.
Hope it helps.
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