Ricoh D143 Field Service Manual page 886

6. Troubleshooting
Test pattern check
The main scan registration of K is
shifted.
The main scan length of K is shifted.
After Executing SP2-111-001
• Result: "0" in SP2-194-007
• Result: Color registration errors in SP2-194-010, -011, -012
Test pattern check
Low image density on the output
The main scan registration is shifted,
but only at the central area of the
image on the output.
The main scan registrations of Y, M, C
are shifted.
884
Possible cause/Countermeasure
• Abnormal SP setting value of main scan: K
Adjust the value with SP2-101-001.
• Abnormal SP setting value of main scan length
detection: K
Adjust the value with SP2-185-001.
Possible cause/Countermeasure
• Low pattern density
Do the forced process control (SP3-011-001) or supply
some toner (SP3-015-xxx).
• Defective ID sensor at center
• Deformed center area on the image transfer belt
• Defective IPU
1. Replace the ID sensor.
2. Replace the image transfer belt.
3. Replace the IPU.
• Defective laser optics housing unit
• Defective ID sensor
• Defective IPU
• Incorrect SP value
1. Replace the laser optics housing unit.
2. Replace the ID sensor.
3. Replace the IPU.
4. Adjust the value with SP2-182-004 to -021.