Toner Density Too Low - Ricoh FT5233 Service Manual

COPY QUALITY

2.12 TONER DENSITY TOO LOW

- Phenomenon -
1. Light copy
2. Carrier is on the copy.
3. Light spots appear in black solid areas.
- Possible Causes -
1. Toner supply clutch does not rotate.
2. Copier is in the (abnormal) fixed toner supply mode.
3. Main control board is defective.
4. ID sensor pattern bias is too high.
5. ID sensor grid bias voltage is too high.
- Action -
Check the Vsp/Vsg data by SP55.
Clean the ID&V sensors and around the drum.
Adjust ID/V sensors by SP54.
Can the ID sensor be adjusted correctly?
Yes No
Refer to the section of SC74.
Enter to SP9 (Output mode) and supply toner by output number 13 for
black or 14 for color until Vsp reaches around the threshold level
(0.4 V for black and 1.0 V for color). Check Vsp by SP55 as necessary.
6-18
12 February 1992