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Hooray, i solved the problems and the printer does it's job again :) I received some service manuals yesterday (840,850,860 models). Here is what i did (the problems) if you are interested in: Preheater lamps did not worked at my first posting: the connectors were corroded. I disassembled...

The bulbs are flashing. I found out that the sensor is working correctly. Seems that the printhead overheats the drum. If i disconnect the printhead (heating etc.) the drum is heated to it's operating temperature. (even can touch it with the hand for short time). The fan is also slowing down and...

Thank you ! I checked the fan and it works. As i have not the diagnostic software (and cable), i cannot monitor the sensors. I measured the drum temperature sensor and it has ~220kOhms at room temperature but i falls to ~30kOhms within 3 seconds. Does this mean it is defective or is this big...

Hello ! When i boot the printer the error 15,003 shows up. But an error 15,004 never did. It appears sometimes at 57% warmup time, sometimes 89% etc. I checked the halogen bulbs, which are both ok. I also cleaned the temperature sensor and measured it's thermal resistance (decreases/increases...