Ricoh D143 Field Service Manual page 884

6. Troubleshooting
Test pattern check
White image, Abnormal image,
Low density
Normal image, but with color
registration errors
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
Low image density on the output
The main scan registrations of Y, M, C
are shifted by more than ±1.4 mm
from the main scan registration of K.
882
Possible cause/Countermeasure
• Defective laser optics housing unit shutter
• Defective image processing unit
• Low density of test pattern
• Defective IPU
1. Replace the shutter motor.
2. Replace the high voltage power supply unit.
3. Do the forced process control (SP3-011-001) or supply
some toner (SP3-015-xxx).
4. Replace the IPU.
• Defective ID sensor shutter
• Defective ID sensor
• Defective IPU
1. Replace the ID sensor shutter solenoid.
2. Replace the ID sensor.
3. Replace the IPU.
Possible cause/Countermeasure
• Low pattern density
Do the forced process control (SP3-011-001) or supply
some toner (SP3-015-xxx).
• No defective component
• Defective laser optics housing unit
• Defective IPU
1. Do SP2-111-003 again.
2. Replace the laser optics housing unit.
3. Replace the IPU.