I had error oxF3.
I was set to bin this ace printer, I just googled the error code and bam this guide came up. This was awesome, I only found a little dirt on the step 12 clear plastic disc, nothing visible on step 13. Put the cartridges back in, maintenance tank paper tray and hooked up the power and network cable, and covered the 2 switches with tape. then OMG it worked. Now need to work out which screw goes where and reassemble.