Ricoh D117 Service Manual page 446

Test pattern check
Low image density on the output
The main scan registrations of M,
C, Y, K are shifted by more than
±1.4.
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, K is more
than ± 0.75 mm at the end of the
scan line?
SM
Possible cause/Countermeasure
Low pattern density

Do the forced process control (SP3-011-001) or
supply some toner (SP3-030-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 PCDU

Defective laser optics housing unit

Defective BICU

1. Perform the color skew adjustment (
2. Reinstall or replace the PCDU.
3. Replace the laser optics housing unit.
4. Replace the BICU.
6-85
Troubleshooting Guide
p.4-3).
D117/D118