Kyocera C5020N - FS Color LED Printer, Service Manual

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2F3/2F4
1-5-28
(6) The background is colored. Causes
1. Defective developing sleeve bias output.
2. Defective primary transfer cleaning unit.
3. Defective color calibration.
Causes Check procedures/corrective measures
1. Defective developing sleeve bias output.
A. Defective developer.
Check the four colors of image by using the test print of service mode. If
the defect appears on a particular color, replace the developer for that
color. See pages 1-4-14, 1-6-12.
B. Defective bias high voltage PWB.
Replace the bias high voltage PWB. See page 1-6-46.
C. Defective engine controller PWB.
Replace the engine controller PWB (A0004). See page 1-6-41.
D. Defective main controller PWB.
E. Defective drum unit.
Replace the drum unit. See page 1-6-13.
2. Defective primary transfer cleaning unit.
Replace the primary transfer cleaning unit. See page 1-6-24.
3. Defective color calibration.
A. Dirty sensing surface of the toner ID sen-
sor.
Clean the sensing surface of the toner ID sensor.
B. The printer environment considerably
changed since an automatic calibration
was made.
Perform the color calibration of service mode. See page 1-4-14.
Replace the main controller PWB (A0010*
1
/A0011*
2
). See page 1-6-40.
*1
: 16 ppm printer,
*2
: 24 ppm printer