Swapped out CM2320nf Fuser Causes Black Pages. FW: 20140625.

I’m sorry this is so long but I want to avoid unnecessary “Tried that” posts.
My fuser was working fine except the sleeve and pressure roller were worn out and causing wrinkles along the left side of the page and occasionally folded over the page onto itself.
I swapped the fuser out with one from one of my CP2025s that I know work. No wrinkling or folding now but the printer prints out all black pages.
I’ve tried everything including, resetting to factory defaults both from the menu and using the up arrow and cancel buttons down on power up, recalibrating and cleaning. Secondary functions to clean the belt produced a smeary grey page. Color calibration causes black pages plus horizontal lines about a quarter of an inch high of the other 3 colors about an inch apart between the rest of the black page. Scan calibration also gives similar results. I also tried reinstalling the latest firmware dated 20140625. I tried using the Automatic Document Feeder to make a copy of a scanned page, same black page.
I took out the fuser and reinstalled it to make sure I didn’t miss any electrical connections. This time I didn’t waste my time following the instructions in the Service Manual which tell you to remove all covers and the scanner unit. All’s you really have to do is pop off the back door right side stopper bar and remove the 3 screws at the top and lift up to remove back cover panel. The back door then comes off with the cover. Then 2 screws to get the fuser out. Nothing wrong or missing from the first installation so I reinstalled the fuser and still get the same results.
I tried hooking it up to the network and was able to look at and set things up using the web based interface. All are working fine. I did a printer control panel keyboard test twice to make sure all keys are working and none are stuck in the down position. No problems.
Finally I tried to print the test page from the Windows 8.1 64 bit OS Devices and printers page for this printer. Again no text only a black page.
At no time have I gotten any text on any pages printed. Sometimes the black page will come out with a little color. Usually green.
I read the entire User Manual, Technical Reference Manual and Service Manual. The Service Manual has one section stating you can’t replace 2 of the circuit boards at the same time because one contains information about the other so if one is replaced the other will restore its information once the new board is installed. If you try replacing both boards at the same time both boards don’t have the information about the other so neither board gets restored causing major image quality problems.
I did not remove or install any circuit boards. I only removed the straps connecting boards that I was instructed to detach using the instructions in the Service Manual.
I’m at a loss as to how to fix this and don’t know how it could have happened unless one of the circuit boards got damaged during the process. This is real annoying because these boards did not need to be exposed in the first place and were only exposed because of the unnecessary instructions to remove all the panels and covers in the Service Manual.
Any help will be greatly appreciated.
Best Regards,
Paul Mighetto

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Swapped out CM2320nf Fuser Causes Black Pages. FW: 20140625.

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