15) Toner Cartridge Cannot Be Recognized.(Errors 543); Toner Cartridge Cannot Be Recognized. (Errors 543); Error Caused By The Consumable Items; Error Caused By The Toner Sensor - Oki B721 Maintenance Manual

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6.5.2.(15) Toner cartridge cannot be recognized. (Errors 543)

(15-1)

Error caused by the consumable items.

Check item
(15-1-1) Consumable items installation condition
ID unit and toner Check that the ID unit is installed in the
cartridge normal position. Check that the lock lever of
the toner cartridge is locked.
(15-2)

Error caused by the toner sensor

Check item
(15-2-1) Toner sensor condition
Toner sensor Is the receptor of the toner sensor stained?
Toner sensor Confirm that the toner sensor works normally
by using the SWITCH SCAN function of the
self-diagnostic mode.
Place a white paper in front of the toner
sensor, and check if the SCAN state changes
or not.
45487001TH Rev.1
Actions to be taken
Check work
at NG
Correct the
installation to
the normal
installation
condition.
Actions to be taken
Check work
at NG
Wipe off the
stain from the
toner sensor.
Replace the
toner sensor
board or the
FFC between
the toner
sensor board
and the PU/CU
board.
Note! Toner sensor operation check method using the SWITCH SCAN function of
the 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 using
the 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 to
section 6.3.2.3 Switch Scan Test
2. Remove the ID unit and the toner cartridge (TC) from a printer. There is a
window inside a printer opposing the ID side when viewed from the front of a
printer. The toner sensor is located inside the window.
3. Place a white paper 3 mm away from the sensor window. The white paper
should 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 toner
sensor, the control panel display shows "L". When the paper is moved so that
any light is not reflected by the paper so that the incident light does not reach
the toner sensor, "H" is displayed on the control panel.
5. If the control panel display toggles between "H" <-> "L" as a paper is flipped
in front of the toner sensor, it indicates that the toner sensor and the related
system 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 toner
and paper dust.
• Check the connection condition of the FFC cable between the PU/CU board
and the toner sensor board (97T).
• Perform the operation check again. If the situation has not bee improved and
remains 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) side
1. To the position where the toner sensor is confirmed to be operating normally
in the printer itself by the above paragraph (1), install the TC and the ID unit to
check 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. (Stain
due to toner or paper dust)
6. Troubleshooting procedure
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