User Guide

Cause Solution
The color misregistration detection unit is defective. Replace the paper feed assembly.
The DC controller PCB is defective or the connection to the
high-voltage power supply is loose.
1. Check the connector (J1012) on the DCC.
2. Upgrade the firmware using the RFU process.
3. Replace the DC controller PCB. Calibrate the MFP
after replacing the DC controller. See Calibrating the
MFP on page 579.
Dark color
This table contains information about the causes of and solutions for dark color.
Table 7-18 Causes for dark colors
Cause Solution
A poor contact exists in the drum ground, primary charging
bias, and developing bias contacts of the high-voltage PCB
and the print cartridge.
Clean the contacts on the cartridge for the affected color. If
they are still dirty after cleaning, or if they are damaged,
replace the affected cartridge.
The high-voltage contacts are damaged. Replace the high-voltage contacts for the affected color.
The high-voltage PCB is defective. Replace the high-voltage PCB.
The DC controller PCB is defective or the connection to the
high-voltage power supply is loose.
Replace the DC controller PCB. Calibrate the MFP after
replacing the DC controller. See
Calibrating the MFP
on page 579.
Completely blank image
This table contains information about the causes of and solutions for completely blank pages.
Table 7-19 Causes for a completely blank image
Cause Solution
The high-voltage PCB is defective or the connection is loose. 1. Reseat the connection.
2. Replace the high-voltage PCB.
The DC controller PCB is defective or the connection to the
high-voltage power supply is loose.
Replace the DC controller PCB. Calibrate the MFP after
replacing the DC controller. See
Calibrating the MFP
on page 579.
All black or solid color
This table contains information about the causes of and solutions for all black or solid color.
Table 7-17 Causes for dark images (continued)
564 Chapter 7 Troubleshooting ENWW