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Hi Kosar, This error in copiers are usually because of temperature troubles at the chip-set level. This means we might have to change a lot of hardware like the thermister, heater lamp, PCU PWB ... I would recommend you calling up the hardware vendor and have it fixed. All the best Cheers!
F1 means "shifter Motor Trouble". The motor that driver the shifting mechanism at the paper exit side is not functioning. The motor could be bad or there may be something binding the motor up. Take a real close look at the exit unit (where the paper comes out of the machine) and see if there is anything in the way of the shifter. It could also be a bad board issue - sending the wrong signal to the motor... or possibly a bad home position sensor for the shifter. You could try taking the shifter unit out for a closer inspection - make sure its properly installed. Hope this helps.
Sorry to say it, but it is time to contact HP Support, they will have to walk you through what needs to be done. I am a veteran of HP and software problems, got four of them. They work just great once you get them on board, but it can be a real pill getting through the problems.
That is a CRUM communication error. The CRUM is a chip that resides on the toner cartridge that keeps track of the toner usage and resets when a new toner is installed. If you replaced the toner recently it may be corrupt. If you got a refurbidhed toner they may have reprogrammed the CRUM incorrectly. Power supply problems often cause this error so check your outlet to make sure it is withinn the proper voltage range and also that it is not on the same circuit as other devices. Get a "real" surge protector designed for office equipment such as a smartpower. Try changing toners and using genuine supplies.