If your Kyocera P2235dn stops working and flashes orange and green lights, you likely have a problem. This “police car” blinking pattern signals Error 7990. Specifically, it means the waste toner container inside your drum unit is full. Consequently, the printer locks itself to prevent internal damage.
What is Error 7990?
You can identify Error 7990 by watching the status LEDs on printers without an LCD screen. Normally, the official solution requires you to buy a new, expensive DK-1150 drum unit. However, we offer a much better and cheaper way to fix this.
The Professional “Gimik” Modification
We provide a sustainable solution for our clients by modifying the hardware. Specifically, I have already pre-drilled a precise access hole in the waste toner section of the drum housing.
We use this modification for three main reasons:
- First, it allows us to empty the waste toner quickly without taking apart delicate blades.
- Second, it saves you from throwing away a perfectly good drum unit.
- Furthermore, you can service the same unit many times in the future because of this hole.
Step-by-Step Recovery Process
- Remove the units: Carefully take out the toner and drum assembly.
- Empty the toner: Use the pre-drilled access point to empty the waste toner into a sealed container. Additionally, you can use a toner vacuum for a cleaner job.
- Test the printer: Reinstall everything and turn the power on. Finally, the lights should turn solid green.
Recommended Solutions & Tools
To ensure your printer continues to run smoothly after this fix, we recommend using high-quality ready-made modules and the proper maintenance tools.
- Replacement Drum Module: Kyocera DK-1150 Compatible Drum Unit – If your drum is already showing wear or scratches, replacing the entire module is the most reliable path.
- Maintenance Tool: Atrix High-Capacity Toner Vacuum – Essential for safely removing fine toner particles without blowing them into the air or damaging your lungs.
Related Guide: How to bypass Kyocera Non-Genuine Toner Error
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