Toner End/Near-End Control; Near-End Detection; End Detection/Recovery From Near-End - Ricoh Aficio 480W Dolphin-C2 Service Manual

28 April 2005

6.6.7 TONER END/NEAR-END CONTROL

Near-end Detection

Near-end occurs if the ID sensor reads Vsp/Vsg values three times in succession
that are larger than the Vend value specified with SP2927 001 (Toner Near End
Level),.

End Detection/Recovery from Near-end

After the machine enters the near-end status, the ID sensor pattern check
accelerates from 100 cm to 20 cm intervals.
Then, the machine changes status in accordance with the following conditions:
• Toner End: Toner end occurs if Vsp/Vsg stays continuously more than Vend
while a certain length of paper is printed. Then the toner end message is
displayed, and machine operation halts. The length of paper depends on SP
2927 002 (default setting: 1500 cm). If Vsp/Vsg drops below Vend, the distance
count stops. But, if the next Vsp/Vsg reading exceeds Vend again, the count
begins again from the previously accumulated total.
• Recovery from Near-end: If Vsp/Vsg drops below Vend three times in
succession, then the following happens:
• The machine is released from the near-end status
• The distance counter is reset to zero
• The ID sensor pattern check interval is restored to its original value (this
interval depends on SP3920; the default is 100 cm intervals).
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