Some information for you C4520
Some information for you C4520
Hi,
Regarding to the Error code C 4520 with the KM 6500/6501, this is the problem when the machine perform the " Automatic color registration correction" was aborted.
So what does it mean of Color registration correction:
- Purpose: To prevent registration errors on transfer belt. (Drift in the main scan direction, Drift in the sub scan direction, Entire horizontal magnification in the main scan direction, Skewing).
- The color registration marks for each color are transferred on the transfer belt.
These locations are detected by the color registration sensor/F and the color registration sensor/R to determine the image drift amount for each color. If the amount for a color is beyond the set point, it adjusts the image write timing, the clock frequency, and the angle of the cylindrical lens 2 for the corresponding color.
Again, the machine dectect the Color registration marks (two color marks, front side and Rear side) on the Transfer belt by the color registration sensor/F and the color registration sensor/R. This procedure will be done when:
- Turn on the machine, and the machine is warm up and the temp of fusing unit below 70 DegC. The time required about 2 mins.
- The specified number of page is printed. Time required : about 30 seconds
- The print operation has not been performed for a certain time (~1hr) Time required : about 30 seconds
- A certain change in temperature is detected (about 20%) from the temp detection board (TDB). Time required : about 30 seconds
So the problem C4520 appeared, maby it cause by:
- Color registration sensor/F and the color registration sensor/R ( The location is on the main frame, behind the transfer belt may be dirty (you have to clean) or damged.
- Color marks problems: So you have to check laser unit, charging corona, drum unit, developing unit, and transfer belt. Alot of thing you need to check but very easy for the service because he known the machine.
For example: if the drum unit Y is damaged --> the density of the Yellow mark is too light --> the sensor can detect this mark --> So the error code will appear.
It will the same with charging corona, belt surface, developer...
Hope this helpp to find the source of the problem and then very easy to fix it.
Cheer!