Ricoh FT4460 Service Manual page 343

28 February 1989
6. Defective or deteriorated drum.
(1) With a deteriorated drum, check the Vr correction level.
NOTE: If the Vr correction rate is less than 37%, Vr correction is no longer
effective and the drum must be replaced.
(2) Correct the deformation of the drum holder.
7. Set the standard value (3V + 0.1V) for Vde with SP Mode No.58 and set
the ADS memory value with SP Mode No.56.
8. Replace the ADS optical fiber and perform SP Mode No.58 and No.56.
12-6