Oki B721 Maintenance Manual

Also see for ES7131: User manual User manual User manual

Contents

Oki B721 Maintenance Manual Manual pdf 195 page image

Oki Data CONFIDENTIAL45487001TH Rev.1 6-62 /6. Troubleshooting procedure6.5.2.(15) Toner cartridge cannot be recognized. (Errors 543)(15-1) Error caused by the consumable items.Check item Check work Actions to be takenat NG(15-1-1) Consumable items installation conditionID unit and tonercartridgeCheck that the ID unit is installed in thenormal position. Check that the lock lever ofthe toner cartridge is locked.Correct theinstallation tothe normalinstallationcondition.(15-2) Error caused by the toner sensorCheck item Check work Actions to be takenat NG(15-2-1) Toner sensor conditionToner sensor Is the receptor of the toner sensor stained? Wipe off thestain from thetoner sensor.Toner sensor Confirm that the toner sensor works normallyby using the SWITCH SCAN function of theself-diagnostic mode.Place a white paper in front of the tonersensor, and check if the SCAN state changesor not.Replace thetoner sensorboard or theFFC betweenthe tonersensor boardand the PU/CUboard.Note! Toner sensor operation check method using the SWITCH SCAN function ofthe self-diagnostic mode.(1) How to check operation of the toner sensor at the printer side.1. Status change of the toner sensor can be checked from the control panel usingthe self-diagnostic mode. First, switch the display to the control panel display.For the method of switching the display to the control panel display, refer tosection 6.3.2.3 Switch Scan Test2. Remove the ID unit and the toner cartridge (TC) from a printer. There is awindow inside a printer opposing the ID side when viewed from the front of aprinter. The toner sensor is located inside the window.3. Place a white paper 3 mm away from the sensor window. The white papershould be placed in the manner of opposing the toner sensor.4. When light is reflected by a white paper so that incident light falls on the tonersensor, the control panel display shows "L". When the paper is moved so thatany light is not reflected by the paper so that the incident light does not reachthe toner sensor, "H" is displayed on the control panel.5. If the control panel display toggles between "H" <-> "L" as a paper is flippedin front of the toner sensor, it indicates that the toner sensor and the relatedsystem of the printer are working normally.Action to be taken at NG• Clean surface of the toner sensor to remove the stains due to residual tonerand paper dust.• Check the connection condition of the FFC cable between the PU/CU boardand the toner sensor board (97T).• Perform the operation check again. If the situation has not bee improved andremains unchanged, replace the PU/CU board or the toner sensor board (97T).(2) How to check operation of the toner sensor at the toner cartridge (TC) side1. To the position where the toner sensor is confirmed to be operating normallyin the printer itself by the above paragraph (1), install the TC and the ID unit tocheck operations by observing display on the control panel.Action to be taken at NG• Check operation condition of the respective ID motors by using the Motor &Clutch Test of the self-diagnostic mode.• Clean surface of the silver reflector plate on the side of ID to remove stains. (Staindue to toner or paper dust)