Laser printer ozone filter replacement — step-by-step safety & maintenance guide

Joe B.

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Ozone filter change on HP LaserJet, Canon imageRUNNER, Brother, Kyocera ECOSYS, Xerox — symptoms, part numbers, and how to replace

Technician

Hey! We can stop the laser printer ozone smell and walk you through an ozone (exhaust) filter replacement safely. Tell me your brand/model (e.g., HP LaserJet, Canon imageRUNNER, Brother HL/L series, Kyocera ECOSYS, Xerox WorkCentre/VersaLink) and whether you’re getting an “ozone filter end of life” or “replace exhaust filter” message.

Customer

Open-plan office. We have an HP LaserJet MFP. Strong ozone odor from the printer after big jobs, and the panel says “Replace Exhaust Filter soon.” Where is the ozone filter and can we change it ourselves?

Technician

Got it. Ozone filters (sometimes called exhaust filters or deodorizing filters) capture ozone generated by the corona wire / scorotron / corotron during charging. As the filter saturates, you’ll notice a printer ozone odor, increased dust near the exhaust vent, or a “replace ozone filter” counter. On HP/Canon/Brother/Kyocera the filter is a small charcoal or HEPA‑like cartridge behind a side or rear door. We’ll replace it, check the corona assembly, and reset the maintenance counter.

Customer

Great. What tools do I need and how do I access it on an HP LaserJet?

Technician

HP LaserJet ozone/exhaust filter replacement (typical M404/M428/M507 series; steps vary slightly):
1) Power off and unplug for safety; let the fuser cool 15–20 minutes.
2) Open the right‑side or rear service door. Locate the exhaust/ozone filter cassette near the fan outlet.
3) Slide out the old filter. Bag and dispose per your facility’s policy.
4) Insert the new filter (arrow facing airflow). Typical keywords/parts: HP ozone filter, exhaust filter, deodorizing filter — often bundled in a maintenance kit.
5) Power on, then reset the ozone filter counter in Setup → System → Maintenance (or via the embedded web server).
We’ll also inspect the corona wire/corotron and clean the laser printer air path to reduce future odor.

Customer

What if we have Canon imageRUNNER devices in another department? Same process?

Technician

Canon imageRUNNER / iR‑ADV ozone filter: open the rear or left cover; the deodorizing filter sits in a plastic tray by the exhaust fan. Replace with the correct Canon exhaust filter part number (often included with a corona unit or maintenance kit). After replacement, go to Counter → Maintenance → Deodorizing Filter and reset the service counter. If the device shows persistent ozone smell, clean the primary charge assembly and make sure the vent path isn’t blocked by dust.

Customer

Our warehouse printers are Brother HL‑L and a Kyocera ECOSYS. Any brand‑specific tips? We print high volumes and don’t want downtime.

Technician

Brother: look for the exhaust filter panel near the rear fan. Replace the charcoal filter, then in Machine Info → Parts Life reset the item. Also clean the corona wire inside the drum unit by sliding the blue tab several times—this reduces ozone production and streaks.
Kyocera ECOSYS: most models place the deodorizing filter under a side grille. Filters are often part of the PM kit. After replacement, use Service Mode → Maintenance → Initialize deodorizer counter. Keep vents clear; ECOSYS printers benefit from regular fan path dust removal.

Customer

How often should we replace the ozone filter? We run 10–15k pages/month.

Technician

Typical ozone filter life is 100k–300k pages or 12–24 months, depending on model, duty cycle, paper dust, and environment. Replace earlier if you notice:
• Persistent ozone odor even after cleaning
• Replace exhaust filter / Deodorizing filter end message
• Visible gray dust at the exhaust grille
Pair the change with fuser maintenance, transfer roller checks, and corona wire cleaning for best air quality and print reliability.

Customer

Any safety concerns? HR asked about printer ozone exposure in small rooms.

Technician

Good question. Always power off and allow the fuser to cool before touching internal parts. Wear a mask and gloves if you’re sensitive to dust or toner. Replace the ozone/deodorizing filter in a well‑ventilated area and keep printers in rooms with adequate airflow. If smell persists after service, we can run an air path cleaning, inspect fans, and verify the corona charging unit isn’t arcing.

Customer

Can we buy a maintenance kit with an ozone filter and do everything at once?

Technician

Yes. Many brands ship an MK/maintenance kit that bundles fuser, transfer roller, pickup rollers, and the exhaust/ozone filter. Replacing parts together minimizes downtime. After installation, remember to reset parts life in the service menu so alerts and page counts are accurate.

Customer

If we replace the filter, will the ozone smell go away immediately?

Technician

You should notice a major improvement after the first long print job. If odor lingers, we’ll check for a blocked exhaust path, worn corona wire, or a failing fan. Keeping the room ventilated and the printer free of paper dust also helps.

Customer

Perfect. Let’s schedule replacements for all three devices.

Technician

Summary: To fix a strong ozone smell from a laser printer or a Replace exhaust/ozone filter alert, replace the ozone/deodorizing filter, clean the corona wire/corotron, clear the exhaust path, and reset the maintenance counter. We service HP LaserJet, Canon imageRUNNER, Brother, Kyocera ECOSYS, Xerox and more. Need hands‑on help? Open the chat.

Quick answer: the accepted fix

Accepted fix when you have a printer ozone odor or replace ozone filter warning: Power off and cool the device, replace the ozone/exhaust filter with the correct part, clean the corona wire/charging unit, clear dust from the exhaust path, then reset the filter counter in the service menu.

FAQ

Step‑by‑step (general procedure)

1. Power off, unplug, and let the fuser cool 15–20 minutes.
2. Open the rear/side service door and locate the ozone/exhaust filter near the fan.
3. Remove the old filter; bag for disposal per policy.
4. Install the new filter with airflow arrow aligned; clear dust from vents and fans.
5. Clean or inspect the corona wire / corotron / scorotron.
6. Power on and reset the ozone filter counter in the maintenance/service menu.
7. Run a long print to verify reduced odor and proper exhaust flow.

Driver/firmware notes

1. Update firmware if the parts life or deodorizing filter counter won’t reset.
2. For managed fleets, log the change in your MPS/monitoring tool so the next maintenance kit shipment includes the filter.
3. Position printers in ventilated areas to minimize printer ozone odor between replacements.

Sources

• HP — LaserJet maintenance kits & parts life
• Canon — imageRUNNER maintenance & deodorizing filter
• Brother — HL/L series maintenance and corona cleaning
• Kyocera — ECOSYS preventive maintenance
• Xerox — WorkCentre/VersaLink supplies & parts

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