Ricoh Robin Service Manual page 267

SERVICE CALL CONDITIONS
2.16 ABNORMAL CONDITION IN TONER DENSITY
DETECTION
- Problem -
The Auto ID indicator or the selected manual ID level blinks. (No SC Code is
indicated.)
- Definition -
If Vsg goes below 2.5 volts or Vsp goes above 2.5 volts five times in a row.
- Possible Causes -
Incorrect Vsg voltage
•
Dirty ID sensor
•
Low toner density
•
Defective ID sensor
•
• Defective main board
- Action -
Check the Vsg voltage displayed on the operation panel with SP55.
5.00
(Vsp ≥ 2.5 volts)
Is the copy image too light?
No
Is the ID sensor circuit open?
No
Replace the main board and adjust Vsg to 4.0 ± 0.2 volts.
Is the ID sensor surface dirty with toner?
No Yes
Clean the ID sensor with a blower brush and, if needed, with a damp
cloth, then check and adjust Vsg to 4.0 ± 0.2 volts. If toner scattering
occurs, correct it. (Refer to the Toner Scattering section.)
0.00
(Vsg ≤ 2.5 volts)
Yes
Refer to the Light Copy section.
Yes
Replace the ID sensor and adjust Vsg to
4.0 ± 0.2 volts.
6-50
24 June 1994