Kyocera Mita FS-C5016N - Color LED Printer Service Manual page 68

FS-C5016N
(5) Image is too light.
Causes
1. Defective developing bias output.
A. Defective developer.
B. Defective bias high voltage PWB.
A. Defective engine controller PWB.
B. Defective main controller PWB.
C. Defective drum unit.
2. Dirty drum.
3. Defective color calibration.
A. Dirty sensing surface of the toner ID sen-
sor.
B. The printer environment considerably
changed since an automatic calibration
was made.
4. Dirty SELFOC lens of LED print head.
(6) The background is colored.
Causes
1. Defective developing sleeve bias output.
A. Defective developer.
B. Defective bias high voltage PWB.
C. Defective engine controller PWB.
D. Defective main controller PWB.
E. Defective drum unit.
2. Defective primary transfer cleaning unit.
3. Defective color calibration.
A. Dirty sensing surface of the toner ID sensor.
B. The printer environment considerably
changed since an automatic calibration
was made.
1-5-24
Causes
1. Defective developing bias output.
2. Dirty drum.
3. Dirty SELFOC lens of LED print head.
Check procedures/corrective measures
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 1-4-11, 1-6-11.
Replace the bias high voltage PWB (KP-980). See page 1-6-30.
Replace the engine controller PWB (KP-1054). See page 1-6-25.
Replace the main controller PWB (KP-957). See page 1-6-24.
Replace the drum unit. See page 1-6-12.
Perform the drum surface refreshing. See page 1-4-12.
Clean the sensing surface of the toner ID sensor.
Perform the color calibration of service mode. See page 1-4-10.
Clean the SELFOC lens of LED print head by using LED cleaner.
Causes
1. Defective developing sleeve bias output.
2. Defective primary transfer cleaning unit.
3. Defective color calibration.
Check procedures/corrective measures
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 1-4-11, 1-6-11.
Replace the bias high voltage PWB (KP-980). See page 1-6-30.
Replace the engine controller PWB (KP-1054). See page 1-6-25.
Replace the main controller PWB (KP-957). See page 1-6-24.
Replace the drum unit. See page 1-6-12.
Replace the primary transfer cleaning unit. See page 1-6-16.
Clean the sensing surface of the toner ID sensor.
Perform the color calibration of service mode. See page 1-6-17.