I have a 'service call 17h' error condition and was about to use some FixYa instructions that worked last time but this time i am unable to get past first-base, i.e. i cannot remove the OPC drum cartridge - it seems to be stuck.

Open the front door and remove the waste toner bottle and transfer belt. use a flat bladed screwdriver in the small hole at the 10 o'clock position of the hole where the toner cartridges are installed. this now allows you to rotate the toner carousel slightly to free the OPC drum and remove it. you will probably find that a toner is not in its slot correctly and jammed against the drum causing the error 17h. use the release mechanism to rotate the carousel and remove all of the toners. check them for any damage, also the OPC drum, power up the printer and refit the parts as requested on the display, being very careful to put the correct toner in the correct slot.