OKI C711dn Error 990: Waste Toner Box Full
Error code 990 indicates that the OKI C711dn Waste Toner Box is full or its sensor detects excessive powder blocking its detection prism, disabling all print actions until cleared.
Common causes
- 1The waste toner container has reached its operational capacity.
- 2Toner dust coating the optical feedback sensor lens.
- 3Improper installation or mechanical misalignment of the waste container.
Solutions
Practical Resolution Actions
Never attempt to vigorously shake or forcefully vacuum the waste toner bottle with standard household vacuums, as toner particles can bypass normal filters and present respiratory hazards.
- Inspect Waste Bottle Fill Level:
Check the visual window of the waste box. If the toner has reached the limit level, install a replacement unit.
- Clear the Optical Detection Path:
The device uses an infrared emitter and receiver to monitor the clear portion of the box. Wipe the corresponding sensor lens inside the dry service recess.
Steps to follow
- 1
Open waste cover
Locate and open the waste toner access door on the side of the OKI C711dn.
- 2
Remove the old unit
Gently press the release tab and pull the waste container out horizontally to prevent spilling.
- 3
Clean optical sensor
Identify the optical diagnostic sensor recessed in the machine cavity. Clean it with a dry, lint-free microfiber swab.
- 4
Insert replacement box
Slide the fresh waste toner bottle along its rails until it snaps securely in place.
Videos
Frequently asked questions
It is highly discouraged. Residual dust on the internal light guides will keep triggering the 990 code even after manual emptying. Replacing the part is the cleanest solution.
Dust has settled on the photodetector window inside the printer. Use a dry cotton swab to wipe the sensor located near the back of the cavity.