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1- Check if the black toner bottle is seated correctly in position > if not it will result in the error code.
Removing the black toner bottle and manually opening and closing the end cap along with re-seating the bottle may resolve the code.
2-The gear stripes out do to friction in the developer assembly. Replacing the gear may not resolve the problem. Open the developer and check for toner clumping and for a stuck auger. Rotate the auger by hand with the cover open and see if the toner moves freely.
Solution :
It has been found that the D cut portion of the drive gear can strip out and not allow drive to the developer. The drive gear is a X shaped gear. The gear part number is FC8-4338-000.
**Knowledge is time consuming, exhausting and costly for a trained Tech.**
Here's what I found. Not sure if the above techs fixed it so thought I'd send this.
Code: E027-0400
Description:Error in supply with Bk Developing Assembly
Failure in detection about the changes of ON => OFF => ON with the sensor which detects a full rotation of the supply screw within the specified period of time.
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