Judgment for Type of Color Registration Error Ricoh MP C2004 C2504 Service Manual

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4.20.10 COLOR REGISTRATION

Adjust color registration with the following procedure when color registration errors occurred.

Check the Occurrence of Color Registration Errors

Prepare some A3 sheets.

1. Execute SP2-111-004 (Forced line Position Adj.: Mode d)

2. Make sure that execution completed successfully with using SP2-194-007 (MUSIC).

If the value of SP2-194-007 is "0", it indicates that the result of SP2-111-004 was successful. If the value of SP2-194-007 is "1", it indicates that the result of SP2-111-004 was a failure, which you need to fix the color registration errors (See "Ways to fix color registration errors" (page 4-233))

3. Execute SP2-109-003 (Test Pattern: Pattern Selection)

4. With a loupe, check the details of the color registration errors on the printed test pattern. (page 4-233)

 Specification: Main/Sub is smaller than 180.0um

 No color registration errors: Adjustment completed.

 Color registration errors occurred: Adjust the color registration errors (See "Ways to fix color registration errors" (page 4-233)

Judgment for Type of Color Registration Error

In the following diagrams, solid lines represent "K" and dotted lines indicate any of "C", "M" or "Y".

1. 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.

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2. 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.

3. 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.

4. 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"

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Case "C" or "Y"

5. 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 PCU, image transfer belt, power pack

2. Execute process control, supply toner

3. Replace 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 shutter failure

2. ID sensor failure

3. BCU(IPU) failure

Image Adjustment

	Solution	1. Replace ID sensor shutter 2. Replace ID sensor 3. Replace 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 the process control Supply toner
	Pattern	-
	Result of Check	Leading edge registration for "M", "C", and/or "Y" shifts over ±1.4 mm 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 laser unit 3. Replace BCU(IPU)
	Pattern	3
Out of line position correction range	Result of Check	Leading edge registration of "M", "C", and/or "Y" shifts over ±1.4 mm 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 image transfer belt 3. Replace PCU/ PCU motor 4. Replace BCU(IPU)
	Pattern	1, 2

Replacement and Adjustment

Image Adjustment

Result of Check

The main scan magnification is OK, but the color registration in the center of the image shifts over 0.66 mm.

Causes

1.ID Sensor(Center) failure

2. Significant movement of image transfer belt (Center)

3.BCU(IPU) failure

Solution

1. Replace ID Sensor

2. Replace image transfer belt

3. Replace 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. PCU installation failure

2. Laser Unit failure

3. BCU(IPU) failure

Solution

1. Reset/Replace PCU

2. Replace laser unit

3. Replace BCU(IPU)

Pattern

Result of Check

Other

Causes

1. The upper skew correction value is abnormal

2. BCU(IPU) failure

Solution

1. Reset skew correction value (*1)

2. Replace BCU(IPU)

Pattern

*1 Method for resetting the skew correction value.

1. Turn the power OFF.

2. Remove the left cover (page 4-12)

3. Remove the harness of the laser optics positioning motor attached to the laser unit (15-pin).

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4. 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)

5. Turn the power OFF.

6. Connect the harness of the laser optics positioning motor to the laser unit.

7. 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	-

Replacement and Adjustment

Image Adjustment

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 laser unit

2. Replace ID sensor

3. Replace BCU(IPU)

Pattern

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 image transfer belt

2. Replace ID sensor

3. Replace 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 laser unit

2. Replace ID sensor

3. Replace BCU(IPU)

Pattern

Image Adjustment

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 Image transfer belt

2. Replace PCU, drum motor

3. Replace ID sensor

4. Replace 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. PCU installation failure

2. Laser unit failure

3. IOB failure

Solution

1. Reset/Replace PCU

2. Replace laser unit

3. Replace IOB

Pattern

Color registration errors found

Result of Check

Shifted Drum phase.

Causes

1. PCU installation failure

2. Drive section failure

3. Phase adjustment failure

Solution

1. Reset/Replace PCU

2. Check/Replace drive section

3. Execute SP1-902-001

Pattern

Image Adjustment

Replacement and Adjustment

SYSTEM MAINTENANCE

RE V IS ION H IST ORY
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