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7410 is an error (all numbers following : is the number of pages printed.
- indicating the Drum Unit is not installed properly or you have a defective curcit board. Tyoically it is drum drum is not fully seated.
If you open the door on the left hand side of the printer, where your waste toner container goes and press firmaly on the drum which is loacted behind the waste toner container and close the printer backup. If the drum is properly seated the error should close.
Error code 0150 is an engine EEPROM communication error. The engine board might need to be replaced. I have heard that sometimes a defective developer unit could cause this same error code. I would try swaping a develper from a working FS-2000D first.