ENWW Image defects 381
Dark image
Dark color
Completely blank image
All black or solid color
Table 7-19 Causes for dark images
Cause Solution
Image density is not adjusted correctly. Calibrate the printer. See Calibrate Now, later in this
chapter.
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.
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.
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.
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.
Defective cartridge (primary charging roller). Replace the problem (solid) color’s cartridge.
High-voltage PCB is defective. 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.
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