When the Konica Minolta bizhub C300i series produces output copies with a light black density, it can affect the quality of your printed documents. Here’s how to diagnose and address this issue:
Fault Phenomenon:
The black density of the machine output copy is light, and the machine frequently displays the C-2557 code for abnormally low black toner density
Solution:
1. Enter the maintenance mode menu, status confirmation-level history one, check the TCR value, and find that the black TCR/K value is only 3%, which is far below the normal value of 6.5%.
2. Check the toner on the surface of the magnetic roller of the machine's developer bin to confirm that the machine's black auxiliary toner bin unit lacks toner; the maintenance mode performs toner hopper replenishment, the black toner bottle does not rotate, and the black toner is not replenished to the auxiliary toner bin
3. After the toner shortage sensor detection window is blocked by toner, the detection light signal is blocked, and the machine mistakenly detects that the auxiliary toner bin is always in a full toner state. Clean the auxiliary toner bin's toner shortage sensor detection window, the machine automatically replenishes toner, and in the maintenance mode, adjust the imaging processing, stabilizer, and initialize the stability, and the printed copy is normal.
Conclusion:
By addressing the low black toner density and ensuring proper toner replenishment, you can resolve the issue of light black density on your Konica Minolta bizhub C300i series printer. Regular maintenance, such as checking the TCR values and cleaning the toner shortage sensor detection window, will help maintain consistent print quality.