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Cause Solution
Dirty color misregistration sensor lens. Clean the color misregistration sensor lens.
Defective color misregistration sensor. Replace the color misregistration sensor.
Defective environmental sensor. Replace the environmental sensor.
Defective DC controller PCB. Replace the DC controller PCB.
Dark color
Table 7-20. Causes for one color printing dark
Cause Solution
Poor contacts with the primary charging bias,
developing bias, or drum grounding.
On the problem (dark) color’s cartridge, check the
primary charging bias and developing bias
contacts to the high-voltage PCB, or the drum
grounding contacts. Clean contacts, if dirty.
Replace defective parts if contacts are deformed
or damaged.
Defective high-voltage PCB. Replace the high-voltage PCB.
Defective DC controller PCB. Replace the DC controller PCB.
Completely blank image
Table 7-21. Causes for a completely blank image
Cause Solution
High-voltage PCB is defective (no developing bias
output).
Replace the high-voltage PCB.
DC controller PCB is defective. Replace the DC controller PCB. Calibrate the
printer after replacing the DC controller. See
Calibrate Now, later in this chapter.
All black or solid color
Table 7-22. Causes for an all black or solid colored image
Cause Solution
Poor contacts with the primary charging bias,
developing bias, or drum grounding.
On the problem (solid) color’s cartridge, check the
primary charging bias and developing bias
contacts to the high-voltage PCB, or the drum
grounding contacts. Clean contacts if dirty.
Replace defective parts if contacts are deformed
or damaged.
Table 7-19. Causes for dark images (continued)
ENWW Image defects 393