Ricoh FW780 Service Manual - Page 53
Toner Near End Condition, Recovery From Toner Near End Condition
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4.4.1 Toner Near End Condition When TS level 5 is detected 3 times in a row, the toner near end condition is detected and the add toner indicator starts flashing. When in the toner near end condition, 16 more meters (A1/D size: 27 copies) can be copied. Then the add toner indicator will light and the machine will not operate. 4.4.2 Recovery From Toner (Near) End Condition After replacing the toner cartridge (opening and closing the original feed unit), the main motor rotates the development unit for 1 minute. For 30 seconds during this period, toner is supplied at 100% of the supply amount. Then, copies can be made. After new toner is installed, the toner density sensor value may fluctuate until 30 meters of copying has been done. This may cause the toner end detection to malfunction even when the new toner cartridge has been installed correctly. Because of this, toner (near) end is not detected until 30 meters (A1/D size: 50 copies) after replacing toner cartridge. The same action as described above will also take place after opening and closing original feed unit, or turning the main switch off and on, or unplugging and plugging power cord. This is known as "fake recovery". A163 2-17 SM