Ricoh D025 Service Manual page 565

Test pattern check
Low image density on the output
The main scan registrations of M,
C, Y are shifted by more than
±1.4 mm from the main scan
registration of K.
The sub scan registrations of M,
C, Y are shifted by more than
±1.4mm from the sub scan
registration of K.
The main scan registration is
shifted by more than ±0.66 mm,
but only at the central area of the
image on the output.
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?
SM Appendix
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 BICU
1. Do SP2-111-003 again.
2. Replace the laser optics housing unit.
3. Replace the BICU.
No defective component
Defective image transfer belt
Defective drive units
Defective BICU
1. Do SP2-111-003 again.
2. Replace the image transfer belt.
3. Replace the drum motor.
4. Replace the BICU.
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.
Defective PCU
Defective laser optics housing unit
Defective BICU
1. Reinstall or replace the PCU.
2. Replace the laser optics housing unit.
3. Replace the BICU.
5-7
Troubleshooting Guide
D023/D025