Muratec MFX-C4000 Field Engineering Manual page 189

Problem Description
Vertical White Band
for Copy Job
Vertical Band for a
Particular Color
Vertical Dark Band
Vertical Random
Streak
Full Solid Black/
Color Image
Service Manual
Alignment & Troubleshooting
Cause Description
1. Contaminations on
CCDM or Scanning
Window
2. Image Cell Error on
CCDM
1. Contaminations on
Charging Roller
2. OPC Cleaning Fail
3. OPC Scratch
1. Contaminations on
Charging Roller
2. Slip on Charging
Roller
1. OPC Scratch
1. Mis-Contact on
Charging Bias
2. Wrong Charging
Bias from HVPS
Action to Resolve
[1. Contaminations on CCDM or Scanning Window]
[2. Image Cell Error on CCDM]
[1. Contaminations on Charging Roller]
1.1) If the Charging roller is contaminated, replace the
developing unit.
[2. OPC Cleaning Fail]
2.1) Check that there is the vertical band on OPC after normal
printing. If the vertical band occurs, replace the developing
unit because of the defective OPC cleaning Blade.
[3. OPC Scratch]
3.1) If the OPC is scratched, replace the developing unit.
[1. Contaminations on Charging Roller]
1.1) If the Charging roller is contaminated, replace the
developing unit.
[2. Slip on Charging Roller]
[1. OPC Scratch]
1.1) If the OPC is scratched, replace the developing unit.
[1. Mis-Contact on Charging Bias]
1.1) Check and confirm the Charge Bias[TM #105-0010~0016].
If there is any wrong value, change the value.
1.2) Check the Charge Bias [EDC #105-0000~003]. If it is
defective, replace the HVPS.
1.3) Check the connection between the charging bias Harness
and the developing unit.
1.4) If the connection is OK, check the charging roller contact.
1.5) If the ITB contact is defective, replace the ITB.
[2. Wrong Charging Bias from HVPS]
2.1) Check the external temparature sensor and humidity
sensor.
2.2) If the sensor is normal, check the Charge Bias[TM #105-
0010~0016]. If or not, change the value.
2.3) Check the Charge Bias [EDC #105-0000~003]. If it is
defective, replace the HVPS.
2.4) If it is normal, check the contact between charge high
voltage harness and developing unit.
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