380 Troubleshooting ENWW
Light image
Light color
Print out a solid filled image of the problem (light) color using an external device. In the course of
printing, turn the printer off and take the problem color’s cartridge out. Manually open the cartridge
shutter. If the toner image on the photosensitive drum is not fully transferred to the transfer unit, go
to step B in the table below. If the toner image on the drum before transfer is light, go to step A.
Table 7-17 Causes for light images
Cause Solution
Image density is not adjusted correctly. Calibrate the printer. See Calibrate Now, later in this
chapter.
The image density is not properly adjusted. Calibrate the printer. See Calibrate Now, later in this
chapter.
Deteriorated transfer unit. If the transfer unit is at the end of its life or its surface
is deteriorated, replace the transfer unit.
Poor secondary transfer bias contacts. On the secondary transfer roller, check the bias
contacts to the high-voltage PCB. Clean contacts, if
dirty. Replace defective parts with deformed/
damaged contacts.
Deformed/Deteriorated secondary transfer charging
roller.
Replace the secondary transfer charging roller.
Defective high-voltage PCB. Replace the high-voltage PCB.
Defective DC controller PCB. Replace the DC controller PCB.
Table 7-18 Causes for one color printing light
Cause Solution
A Poor developing bias contacts. Check the developing bias contacts to the high-
voltage PCB. Clean contacts, if dirty. Replace
defective parts if contacts are deformed or
damaged.
Deteriorated cartridge (photosensitive drum). Replace the cartridge of the problem (light) color.
Defective high-voltage PCB. Replace the high-voltage PCB.
Defective DC controller PCB. Replace the DC controller PCB.
B Poor primary transfer bias contacts. On the transfer unit, check the primary transfer bias
contacts with the high-voltage PCB. Clean contacts,
if dirty. Replace defective parts if contacts are
deformed or damaged.
Deformed/Deteriorated primary transfer charging
roller.
Replace the transfer unit.
Defective high-voltage PCB. Replace the high-voltage PCB.
Defective laser/scanner unit Replace the laser/scanner unit.
Defective DC controller PCB. Replace the DC controller PCB.
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