In the following diagrams, solid lines represent "K" and dotted lines indicate any of "C", "M" or "Y".
- Pattern 1
This is a case in which there is a shift in the sub-scan direction at the leading edge of the paper. The following diagram shows "C", "M" or "Y" lines closer to the leading edge than "K" lines. - Pattern 2
This is a case in which there is a shift in the sub-scan direction at the trailing edge of the paper. The following diagram shows "C", "M" or "Y" lines farther away from the leading edge than "K" lines. - Pattern 3
This is a case in which a color registration error is found in the main-scan direction and size of the error is the same at the left, center and right. - Pattern 4
This is a case in which a color registration error is found in the main-scan direction and the size of the error is different at the left, center and right. For "M", the largest error will be at the right, followed by the center and then the left. For "C" or "Y", the order will be reversed. This is because the writing direction of the laser beam for "K" and "M" is different from "C" and "Y".
Case "M"
Case "C" or "Y" - Pattern 5
This is a case in which a color registration error is found in the sub-scan direction, but it is not the same as the Pattern 1 or 2. The error appears and disappears at intervals down the page.
Ways to fix color registration errors
SP2-111-004 (Forced Line Position Adj. : Mode D) Execution | ||
Result: Failed Case: SP2-194-007: 1 (Failed) | ||
SP2-194-010, 011, 012 shows "2" or "3" | Result of Check | Blank image, abnormal image, low image density |
Causes | 1. Image Processing failure 2. Pattern density low 3. BCU (IPU) failure | |
Solution | 1. Replace the PCDU, Image Transfer Belt, Power pack 2. Execute process control, supply toner 3. Replace the BCU (IPU) | |
Pattern | - | |
Failed to read the pattern of Line position Adj. | Result of Check | Normal (but color registration errors occur) |
Causes | 1. ID Sensor failure 2. BCU (IPU) failure | |
Solution | 1. Replace the ID Sensor 2. Replace the BCU (IPU) | |
Pattern | - | |
Any of SP2-194-010 or 011 or 012 shows "5" | Result of Check | Image density low |
Causes | Pattern density low | |
Solution | Execute process control Supply toner | |
Pattern | - | |
Result of Check | Leading edge registration for "M", "C", and/or "Y" shifts over ±1.4mm from that of "K". | |
Causes | 1. Normal 2. Laser unit failure 3. BCU (IPU) failure | |
Solution | 1. Execute SP2-111-003 (Forced Line Position Adj.: Mode c) 2. Replace the laser unit 3. Replace the BCU (IPU) | |
Pattern | 3 | |
Out of line position correction range | Result of Check | Leading edge registration of "M", "C", and/or "Y" shifts over ±1.4mm from that of "K". |
Causes | 1. Normal 2. Image Transfer Belt failure 3. Drive Section failure 4. BCU (IPU) failure | |
Solution | 1. Execute SP2-111-003 (Forced Line Position Adj.: Mode c) 2. Replace the Image Transfer Belt 3. Replace the color PCU motor and/or the PCU: Black / ITB Drive motor 4. Replace the BCU (IPU) | |
Pattern | 1, 2 | |
Result of Check | The main scan magnification is OK, but the color registration in the center of the image shifts over 0.66mm. | |
Causes | 1. ID Sensor (Center) failure 2. Significant movement of Image Transfer Belt (Center) 3. BCU (IPU) failure | |
Solution | 1. Replace the ID Sensor 2. Replace the Image Transfer Belt 3. Replace the BCU (IPU) | |
Pattern | - | |
Out of line position correction range | Result of Check | Skew of "M", "C" and/or "Y" shifts over ±0.75mm against that of "K" |
Causes | 1. PCDU installation failure 2. Laser Unit failure 3. BCU (IPU) failure | |
Solution |
| |
Pattern | - | |
Result of Check | Other | |
Causes | 1. The upper skew correction value is abnormal 2. BCU (IPU) failure | |
Solution | 1. Reset the skew correction value (*1) 2. Replace the BCU (IPU) | |
Pattern | - | |
*1 Method for resetting the skew correction value.
- Turn the power OFF.
- Remove the left cover (Left Cover)
- Remove the harness of the laser optics positioning motor attached to the laser unit (15-pin).
- Turn the power ON, and then execute the following SPs to set the skew correction mechanism to the origin.
SP2-220-001 (Skew Origin Set M: Skew Motor)
SP2-220-002 (Skew Origin Set C: Skew Motor)
SP2-220-003 (Skew Origin Set Y: Skew Motor) - Turn the power OFF.
- Connect the harness of the laser optics positioning motor to the laser unit.
- Turn the power ON
SP2-111-001 (Forced Line Position Adj.: Mode A) execution (or Color Registration via the Maintenance menu in User Tools) | ||
Result: OK Case: SP2-194-007: 0 (Success) | ||
No color registration errors | Result of Check | Side-to-side registration for K shifted |
Causes | Abnormal SP value of main scan color registration (K) | |
Solution | Adjust SP2-101-001 | |
Pattern | - | |
Color registration errors found | Result of Check | Image density low |
Causes | Pattern density low | |
Solution | Execute process control, Supply toner | |
Pattern | - | |
Color registration errors found | Result of Check | The main scan magnification of "M", "C" and/or "Y" is not correct. |
Causes | 1. Laser Unit failure 2. ID Sensor failure 3. BCU (IPU) failure 4. Normal | |
Solution | 1. Replace the Laser Unit 2. Replace the ID Sensor 3. Replace the BCU (IPU) | |
Pattern | 4 | |
Color registration errors found | Result of Check | Although main scan magnification is OK, the color registration in the center of the image is shifted |
Causes | 1. Significant movement of Image Transfer Belt (Center) 2. ID Sensor (Center) failure 3. BCU (IPU) failure | |
Solution | 1. Replace the Image Transfer Belt 2. Replace the ID Sensor 3. Replace the BCU (IPU) | |
Pattern | - | |
Color registration errors found | Result of Check | The side-to-side registration of "M", "C", and/or "Y" is not correct. |
Causes | 1. ID Sensor (Center) failure 2. Significant movement of Image Transfer Belt (Center) 3. BCU (IPU) failure | |
Solution | 1. Replace the Laser Unit 2. Replace the ID Sensor 3. Replace the BCU (IPU) | |
Pattern | 3 | |
Color registration errors found | Result of Check | The leading edge registration of "M", "C" and/or "Y" is not correct. |
Causes | 1. Image Transfer Belt failure 2. Drive Section failure 3. ID Sensor failure 4. BCU (IPU) failure 5. Normal | |
Solution | 1. Replace the Image Transfer Belt 2. Replace the color PCU motor and/or the PCU: Black / ITB Drive motor 3. Replace the ID Sensor 4. Replace the BCU (IPU) | |
Pattern | 1, 2 | |
Color registration errors found | Result of Check | The skew of "M", "C" and/or "Y" is not correct. |
Causes | 1. Laser Unit failure 2. IOB failure 3. PCDU installation failure | |
Solution | 1. Replace the Laser Unit 2. Replace the IOB 3. Replace the PCDU. | |
Pattern | - | |
Color registration errors found | Result of Check | Shifted Drum phase. |
Causes | 1. Drive Section failure 2. Phase adjustment failure 3. PCDU installation failure | |
Solution | 1. Check/Replace the Drive Section 2. Execute SP1-902-001 (Drum Phase Adj. Execute) 3. Replace the PCDU. | |
Pattern | 5 | |