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Countermeasure list for color registration errors

After Executing SP2-111-003

Result: "1" in SP2-194-007
Result: "2" or "3" (Line pattern detection failure) in SP2-194-010, -011, -012

Test pattern check	Possible cause/Countermeasure
White image, Abnormal image, Low density	Defective laser optics housing unit shutter Defective image processing unit Low density of test pattern Defective BICU Replace the shutter motor. Replace the high voltage power supply unit. Do the forced process control (SP3-011-001) or supply some toner (SP3-015-xxx). Replace the BICU.
Normal image, but with color registration errors	Defective ID sensor shutter Defective ID sensor Defective BICU Replace the ID sensor shutter solenoid. Replace the ID sensor. Replace the BICU.

Test pattern check

Possible cause/Countermeasure

White image, Abnormal image, Low density

Defective laser optics housing unit shutter
Defective image processing unit
Low density of test pattern
Defective BICU

Replace the shutter motor.
Replace the high voltage power supply unit.
Do the forced process control (SP3-011-001) or supply some toner (SP3-015-xxx).
Replace the BICU.

Normal image, but with color registration errors

Defective ID sensor shutter
Defective ID sensor
Defective BICU

Replace the ID sensor shutter solenoid.
Replace the ID sensor.
Replace the BICU.

After Executing SP2-111-003

Result: "1" in SP2-194-007
One of results: "5" (Out of adjustable range) in SP2-194-010, -011, -012.

Test pattern check	Possible cause/Countermeasure
The main scan registrations of M, C, Y are shifted by more than ±15 mm from the main scan registration of K.	Defective laser optics housing unit Defective BICU Replace the laser optics housing unit. Replace the BICU.
The sub scan registrations of M, C, Y are shifted by more than ±20 mm from the sub scan registration of K.	Defective image transfer belt Defective drive units Defective BICU Replace the image transfer belt. Replace the drum motor. Replace the BICU.
The main scan registration is shifted by more than ±0.66 mm, but only at the central area of the image on the output.	Defective ID sensor at center Deformed center area on the image transfer belt Defective BICU Replace the ID sensor. Replace the image transfer belt. Replace the BICU.
The skew for M, C, Y is more than ±0.75 mm from the main scan registration of K	Defective PCDU Defective laser optics housing unit Defective BICU Reinstall or replace the PCDU. Replace the laser optics housing unit. Replace the BICU.
Others	Skew correction upper limit error Defective BICU Defective laser optics housing unit Replace the BICU. Replace the laser optics housing unit.

After Executing SP2-111-003

Result: "1" in SP2-194-007
Result: "0" in SP2-194-010, -011, -012.

Test pattern check	Possible cause/Countermeasure
	Do SP2-111-001 or -002.

After Executing SP2-111-001

Result: "1" in SP2-194-007
Result: "2" or "3" (Line pattern detection failure) in SP2-194-010, -011, -012

Test pattern check	Possible cause/Countermeasure
White image, Abnormal image, Low density	Defective laser optics housing unit shutter Defective image processing unit Low density of test pattern Defective BICU Replace the shutter motor. Replace the high voltage power supply unit. Do the forced process control (SP3-011-001) or supply some toner (SP3-015-xxx). Replace the BICU.
Normal image, but with color registration errors	Defective ID sensor shutter Defective ID sensor Defective BICU Replace the ID sensor shutter solenoid. Replace the ID sensor. Replace the BICU.

Test pattern check

Possible cause/Countermeasure

White image, Abnormal image,

Low density

Defective laser optics housing unit shutter
Defective image processing unit
Low density of test pattern
Defective BICU

Replace the shutter motor.
Replace the high voltage power supply unit.
Do the forced process control (SP3-011-001) or supply some toner (SP3-015-xxx).
Replace the BICU.

Normal image, but with color registration errors

Defective ID sensor shutter
Defective ID sensor
Defective BICU

Replace the ID sensor shutter solenoid.
Replace the ID sensor.
Replace the BICU.

After Executing SP2-111-001

Result: "1" in SP2-194-007
Result: "5" (Out of adjustable range) in SP2-194-010, -011, -012

Test pattern check	Possible cause/Countermeasure
Low image density on the output	Low pattern density Do the forced process control (SP3-011-001) or supply some toner (SP3-015-xxx).
The main scan registrations of M, C, Y are shifted by more than ±1.4 mm from the main scan registration of K.	No defective component Defective laser optics housing unit Defective BICU Do SP2-111-003 again. Replace the laser optics housing unit. Replace the BICU.
The sub scan registrations of M, C, Y are shifted by more than ±1.4mm from the sub scan registration of K.	No defective component Defective image transfer belt Defective drive units Defective BICU Do SP2-111-003 again. Replace the image transfer belt. Replace the drum motor. Replace the BICU.
The main scan registration is shifted by more than ±0.66 mm, but only at the central area of the image on the output.	Defective ID sensor at center Deformed center area on the image transfer belt Defective BICU Replace the ID sensor. Replace the image transfer belt. Replace the BICU.
The skew for M, C, Y is more than ± 0.75 mm from the main scan registration of K. – at the end of the scan line?	Defective PCDU Defective laser optics housing unit Defective BICU Reinstall or replace the PCDU. Replace the laser optics housing unit. Replace the BICU.
Others	Skew correction upper limit error Defective BICU Defective laser optics housing unit Replace the BICU. Replace the laser optics housing unit.

After Executing SP2-111-001

Result: "0" in SP2-194-007
Result: No color registration errors in SP2-194-010, -011, -012

Test pattern check	Possible cause/Countermeasure
The main scan registration of K is shifted.	Abnormal SP setting value of main scan: K Adjust the value with SP2-101-001.
The main scan length of K is shifted.	Abnormal SP setting value of main scan length detection: K Adjust the value with SP2-185-001.

Test pattern check

Possible cause/Countermeasure

The main scan registration of K is shifted.

Abnormal SP setting value of main scan: K

Adjust the value with SP2-101-001.

The main scan length of K is shifted.

Abnormal SP setting value of main scan length detection: K

Adjust the value with SP2-185-001.

After Executing SP2-111-001

Result: "0" in SP2-194-007
Result: Color registration errors in SP2-194-010, -011, -012

Test pattern check	Possible cause/Countermeasure
Low image density on the output	Low pattern density Do the forced process control (SP3-011-001) or supply some toner (SP3-015-xxx).
The main scan registration is shifted, but only at the central area of the image on the output.	Defective ID sensor at center Deformed center area on the image transfer belt Defective BICU Replace the ID sensor. Replace the image transfer belt. Replace the BICU.
The main scan registrations of M, C, Y are shifted.	Defective laser optics housing unit Defective ID sensor Defective BICU Incorrect SP value Replace the laser optics housing unit. Replace the ID sensor. Replace the BICU. Adjust the value with SP2-182-004 to -021.
The sub scan registrations of M, C, Y are shifted.	Defective image transfer belt Defective drive units Defective ID sensor Defective BICU Incorrect SP value Replace the image transfer belt. Replace the ID sensor. Replace the drum motor. Replace the BICU. Adjust the value with SP2-182-022 to -039.
The skew of M, C, Y is different.	Defective PCDU Defective laser optics housing unit Defective IOB Reinstall or replace the PCDU. Replace the laser optics housing unit. Replace the IOB.
The sub scan lines are shifted. Shifted lines appear cyclically.	Defective PCDU Defective drive unit Drum phase adjustment error Do SP1-902-001 (Drum phase adjustment); see Replacement and Adjustment – Drive Unit – Gear Unit for details. Reinstall or replace the PCDU. Check or replace the drive unit.