Muratec MFX-C4000 Field Engineering Manual page 210

3) Dark Image or Black Image
Description : The printed image is dark or black.
Check the state of Black image.
Check the state of the
connector which connects
the engine board and
Check the charge voltage
Charge voltage is not
turned because of
contamination between
power supply in the side
of the drum cartridge and
charge terminal of HVPS.
Service Manual
Alignment & Troubleshooting
HVPS
NO
output of HVPS
NO
YES, the state of connector is not good.
YES, No charge voltage in the HVPS board
YES
4-104
[ Wrong Part ]
1. HVPS
Re-connect connector of the
engine board and HVPS.
.
Replace the HVPS.
Clean the high voltage charge
terminal.