Ricoh FW780 Service Manual - Page 179

1. COPY QUALITY TROUBLESHOOTING 1.1 LOW IMAGE DENSITY Is the used paper moist or extremely dry? No Yes Replace the paper. Is the toner sensor voltage within the no toner supply level (level 0) ? (Refer to Page 2-16.) Yes No Is there sufficient toner in the cartridge? Yes No Replace the toner cartridge. Is the toner supply clutch energized? Yes No Check the main board and the toner supply clutch. Does the toner sensor voltage decrease in the special toner supply mode (SP#62)? Yes No Check the toner supply mechanism. The amount of toner used exceeds the toner supply amount. ⇒Supply toner until the toner sensor voltage reaches the target value. Is the solid black copy dark enough? (Make a solid black copy using SP-#-51.) Yes No Does the image density recover (without dirty background) after forcing supply of toner using SP#62? Yes No Check the charge corona, transfer corona and development bias. Check the toner sensor and main board. Check the light sensor, FL regulator and main board. SM 6-1 A163