Muratec MFX-C4000 Field Engineering Manual page 211

4) Background
Description : Light Dark background appears in whole area of the printing
Background
Check the state of background
Does recycle
paper be used?
Check the voltage
output of HVPS
The life of the
developer
(carrier + toner)
Service Manual
Alignment & Troubleshooting
NO
YES, the voltage output is not good in the HVPS board.
NO
YES, the life of it has been ended
[ Wrong Part ]
1. HVPS
2. Low Q/M of developer (High T/C of developer)
YES
The Imaging unit is not
guaranteed if using recycle paper.
Replace the HVPS.
The Imaging unit is basically
designed to print 50K sheets with
simplex mode. If it prints more than
60K sheets, a background can be
occurred.
when the life of it has been ended.
4-105
.
Replace the Imaging unit