Ricoh SP5 Series Service Manual page 103

DEVELOPMENT AND TONER SUPPLY June 30, 1998
2.6.10 ABNORMAL TD SENSOR CONDITIONS
The TD sensor is checked every copy. If the reading from the TD sensor becomes
abnormal during a copy job, the machine holds the GAIN factor constant to allow
toner supply to vary with only the pixel count for the rest of the copy job. Then at
the end of the job, an SC code is generated and the machine must be repaired.
If there are no spare ID or TD sensors, the toner supply mode can be set to image
pixel count mode using SP 2-208-1.
Details of how the machine determines an abnormal sensor detection are listed in
section 7 (Troubleshooting - SC390).
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