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Even KMBS Tech do not have schematics of that detail on circuit boards
The first code you had was dealing with the middle section of the machine which transports the paper from the right to the left, there is a circuit board that controls the section located under the front cover of that section. the next code you have deals with the scanner under the big glass. either home position sensor is dirty or bad or the drive motor for the scanner is bad or the drive motor board is bad.
This is SB mode, show room mode. To deactivate showroom mode, remove power and reapply. Press Cancel to bypass programming clock. Within 60 seconds of reapplying power, press Oven Light key and top oven Timer key simultaneously.
The meaning of the H4 code is a fuser warm up failure. This means that the fuser is not coming up to temperature as it should within a certain amount of time. This code comes up occaisionally on the AL series for some reason. The fuser unit in cose you don't know is the part that gets hot and is located right where the paper exits the machine. If the code does NOT reset then the part most common to fail is either the thermal fuse or the heater lamp itself.
It all depends on how often the code comes up. Make sure that the machine is not to "cold" at start up. Install a power filter between to the copier and the power outlet to make sure your not getting any line noise that could cause the flase errors. That is about it.
Polygon mirror motor error/lock. Unplug the copier. Wait 20 seconds. Plug it back in. See if that makes it go away.
Otherwise you should get a hold of a service technician but getting parts for a 250 is very tough. It could be the polygon motor, the power supply, a cable, or a board. It will take some time to troubleshoot.