Ricoh D093, Service Manual

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SP2-xxx Drum
D093/D094 2-60 SM Appendix
2927 Toner (Near) End Detection DFU
These SP's set the levels for the toner near-end and toner end levels.
1 Near End Level
Sets the level for toner near end detection. (Vsp/Vsg = Vend).
[0.140 to 0.275/0.145/0.005 V]
2 Toner End Level
Sets the Vsp/Vsg level for toner end detection. The ID sensor must detect this
value three times in succession to detect toner end. The machine stops when
toner end is detected.
[0.150 to 300/0.165/0.005 V]
2928 Toner End Recovery
Recovery starts after the toner cartridge is replaced when a toner-end condition
exists.
[0.130 to 0.215/0.145/0.005 V]
In the toner-end recovery process:
ƒ The machine writes an ID sensor pattern on the surface of the drum.
ƒ The ID sensor reads the density of the ID sensor pattern and converts it to an
electrical signal (Vsp).
ƒ The machine compares the Vsp value with Vsg, which is read from the bare
sursection of the drum (Vsg/Vsg=Vref)
ƒ If Vsp/Vsg < Vref (the value of this SP setting), recovery is completed and
the machine goes back to normal operation.