Ricoh D104 Field Service Manual page 647

Test pattern check
White image, Abnormal image, Low
density
Normal image, but with color
registration errors
After Executing SP2-111-003
• Result: "1" in SP2-194-007
• One of results: "4" (Out of adjustable range) in SP2-194-010, -011, -012.
Test pattern check
The main scan registrations of M, C, Y
are shifted by more than ±15 mm from
the main scan registration of K.
The sub scan registrations of M, C, Y
are shifted by more than ±20 mm from
the sub scan registration of K.
Possible cause/Countermeasure
• Defective image processing unit
• Low density of test pattern
• Defective controller
1. Replace the high voltage power supply unit.
2. Do the forced process control (SP3-011-001) or supply
some toner (SP3-015-xxx).
3. Replace the BCU.
• Defective ID sensors
• Defective BCU
1. Replace the ID sensor.
2. Replace the BCU.
Possible cause/Countermeasure
• Defective laser unit
• Defective BCU
1. Replace the laser unit.
2. Replace the BCU.
• Defective image transfer belt
• Defective drive units
• Defective BCU
1. Replace the image transfer belt.
2. Replace the drum motor.
3. Replace the BCU.
Troubleshooting Guide
6
645