Oki LP-1040 Maintenance Manual page 217

(b) No Toner message problem analysis
Remove the toner cartridge.
Check the remaining toner in the developer unit's hopper.
Is there enough toner remaining so that you cannot see the shaft (agitator)?
Yes No
Supply the toner.
Return the toner cartridge
to the original position.
Does the error appear again after one minute?
Yes No
Select Sensor in Engine Maintenance mode.
Select TS01.
Is On displayed?
Yes
 Check the expiration date of the toner cartridge.
 Check to ensure that the toner was well agitated before it was installed.
If there are no problems, replace the PCB-ASSY-ARC (RIP board) or the PCB-ASSY-AAC
(actuator control board).
No
◆ Check TS01 (remaining toner sensor).
◆ Check for shorts on CBL-DEV1 and CBL-DEV2.
◆ Replace the part below:
- PCB-ASSY-ARC (RIP board);
- PCB-ASSY-AAC (actuator control board); or
- Developer unit.
Chapter 5 Engine Problems Troubleshooting
5-43