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The E7-03 error code means the HDD is not properly installed or is dead. You can check the connections on the HDD and the MFP Controll PWB. You can also use Simulation 62-2 and 62-3 to check the read/write of the hard drive.
controller connection trouble if you are technical then power down the unit and unplug it ....remove rear cover and reseat all connectors....if you are not technical then call for local service rep....are you in the midwestern usa?
F2-31 is related to the image process control for the drum. The drum sirface is read by the image density sensor - if it has a problem doing so then it will give this code. Possible causes could be a bad/old/worn drum or the drum is not being cleaned properly by the drum blade. To run the processor control adjustment do the following : press the "P" key then "*" key then "C" key then "*" key again. this will bring you into service mode. (warning : please do not make any other adjustments in this mode as you can do some serious damage to your copier). then type 44 and press start key then 2 and start key again. Once it is finished running restart the copier. If this fails you need to look at the drum and possibly change it.
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