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 (SP3-030-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
1. Replace the ID sensor.
2. Replace the image transfer belt.
3. Replace the BICU.
The main scan registrations of M, C,
Y, K are shifted.
• Defective laser optics housing unit
• Defective ID sensor
• Defective BICU
• Incorrect SP value
1. Perform the color skew adjustment (
p.159).
2.
Replace the laser optics housing unit.
3.
Replace the ID sensor.
4. Replace the BICU.
5. Adjust the value with SP2-182-004 to -021.
The sub scan registrations of M, C, Y,
K are shifted.
• Defective image transfer belt
• Defective drive units
•
Defective ID sensor
• Defective BICU
• Incorrect SP value
1. Replace the image transfer belt.
2. Replace the ID sensor.
3. Replace the drum motor.
4. Replace the BICU.
5. Adjust the value with SP2-182-022 to -039.
6. Troubleshooting
710
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