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Alignment & Troubleshooting
Service Manual
4-82
Problem Description
Cause Description
Action to Resolve
Horizontal Dark
Band (1.8~2.1mm)
on All Images
1. Runout on Auger in
Developing Unit
[1. Runout on Auger in Developing Unit]
1.1) The problem occurs because of increasing the drive load in
Developing unit.
1.2) Check the OPC curve drive torque. If the drive torque is
increased, check the waste toner overflow of the OPC unit.
If it is overflowed, replace the developing unit.
Horizontal Periodic
Micro Jitter (sub-
1mm Pitch) for a
Particular Color
1. Unbalanced
Charging Bias
[1. Unbalanced Charging Bias]
1.1) It is occurs because of the unbalanced Charging Bias.
Check the external temparature sensor and the humidity
sensor.
1.3) Check the Charge Bias [TM #105-0010~0016]. If there is
any wrong problem, change the value.
1.4) Check the Charge Bias [EDC #105-0000~003].
1.5) If the charge bias is defective, replace the HVPS.
1.6) If the charge bias is OK, replace the Developing unit.
Horizontal Periodic
Jitter (2~3mm Pitch)
for YMC Color
1. High Torque loaded
on Waste Auger in
Developing Unit
[1. High Torque loaded on Waste Auger in Developing Unit]
1.1) The problem occurs because of increasing the drive load in
Developing unit.
1.2) Check the OPC curve drive torque. If the drive torque is
increased, check the waste toner overflow of the OPC unit.
If it is overflowed, replace the developing unit.
1.3) Check the dirve torque in Deve Roller curve.
If the drive torque of the Deve Roller is increased, shake
the developing unit horizontally and re-install it. If the
problem persists, replace the developing unit because of
the gear part.
Vertical White Band
1. ontaminations on
LSU Outer Window
2. Partially No
Developer on
Developing Roller
3. Vertical Damage on
ITB
[1. Contaminations on LSU Outer Window]
1.1) Check that the LSU windows is contaminated by dirt
1.2) Check that there is the contamination on the optical path of
the developing unit.
[2. Partially No Developer on Developing Roller]
2.1) Check that there is the dirt between Deve roller and Dr.
Blade in Developing unit.
[3. Vertical Damage on ITB]
3.1) If the surface of ITB gets damaged, replace the ITB.
Vertical Moving
White Band
1. Contaminations on
Doctor Blade Gap
[1. Contaminations on Doctor Blade Gap]
1.1) Check that there are the dirt or contaminations between
Deve roller and Dr. Blade in Developing unit.
Summary of Contents for MFX-C4000
Page 2: ......
Page 14: ...Precautions Service Manual 1 6 ...
Page 35: ...Service Manual 2 21 Video Controller Power Distribution Product Specifications and Features ...
Page 37: ...Service Manual 2 23 Engine Controller Power Distribution Product Specifications and Features ...
Page 39: ...Service Manual 2 25 DADF Block Diagram Product Specifications and Features ...
Page 106: ...Maintenance and Disassembly Service Manual 3 44 ...
Page 216: ...Alignment Troubleshooting Service Manual 4 110 ...
Page 217: ...System Diagram Service Manual 5 1 5 System Diagram 5 1 Block Diagram 5 1 1 System ...
Page 218: ...System Diagram Service Manual 5 2 5 1 2 Video Controller ...
Page 219: ...System Diagram Service Manual 5 3 5 1 3 Engin Controller ...
Page 220: ...System Diagram Service Manual 5 4 5 1 4 OPE Unit ...
Page 221: ...System Diagram Service Manual 5 5 5 1 5 DADF ...
Page 222: ...System Diagram Service Manual 5 6 5 1 6 SCF HCF ...
Page 225: ...System Diagram Service Manual 5 9 5 2 3 OPE Unit ...
Page 226: ...System Diagram Service Manual 5 10 5 2 4 DADF ...
Page 227: ...System Diagram Service Manual 5 11 5 2 5 SCF HCF ...
Page 228: ...System Diagram Service Manual 5 12 ...
Page 237: ...Reference Information Service Manual 6 9 ...
Page 238: ...Reference Information Service Manual 6 10 ...
Page 239: ...Reference Information Service Manual 6 11 ...
Page 240: ...Reference Information Service Manual 6 12 ...
Page 279: ......