i just got a 2604sdw and it's printing super faint, like the toner isn't sticking, even though the tanks are full.

Diagnosis

The issue of faint or "ghostly" printing on a brand new HP LaserJet Tank MFP 2604sdw is almost always caused by an incomplete initialization of the toner delivery system. Specifically, this model uses a unique tank-to-drum delivery mechanism where the toner must flow from the reservoir into the imaging unit. If the protective shipping seals—which are designed to prevent toner leakage during transit—are not completely removed, the toner cannot saturate the developer roller. When the seals remain, the printer attempts to pull toner, but only a minuscule amount escapes through gaps in the tape, resulting in pages that look like they were printed with a nearly empty cartridge. You can confirm this by printing a "Printer Status Report" from the embedded web server or control panel; if the report shows high toner levels but the actual print output is barely visible or streaky, the physical blockage is the culprit. Another possibility is that the toner has settled or "clumped" during shipping, preventing it from flowing into the hopper.

How to Fix It

To resolve this, you must perform a deep reset of the toner delivery path and ensure all shipping materials are purged. Follow these exact steps:

1. Power down the printer completely and unplug the power cord from the wall outlet to ensure no electrical current is running to the drum.
2. Open the front access door. Locate the black toner cartridge/hopper assembly.
3. Carefully slide the cartridge out of its housing. Inspect the top and sides for a clear or orange plastic pull-tab.
4. Remove the primary sealing tape (the long strip) and the secondary side-seal. Ensure there are no small fragments of adhesive or plastic remaining over the toner discharge port.
5. While the cartridge is out, gently rock the cartridge side-to-side (horizontally) five times. Do not shake it violently, but move it enough to loosen the toner powder and bring it toward the delivery port.
6. Reinsert the cartridge firmly. You should feel a distinct "click" as it seats into the imaging drum assembly. If it is not seated flush, the toner will not transfer.
7. Close the front door and plug the printer back in.
8. Run the "Alignment" or "Calibration" sequence from the Settings menu on the printer display to synchronize the drum and the toner flow.

If That Didn't Work

• Perform a Hard Power Cycle: Unplug the printer and hold the power button down for 30 seconds to drain the capacitors. Plug it back in and print five blank pages. This forces the printer to run a full cleaning cycle on the fuser and drum, which can clear any remaining shipping residue.
• Check Paper Weight Settings: If you are using heavy cardstock or non-HP branded paper, the fuser may not be reaching the correct temperature to bond the toner. Go to the "Paper Settings" menu on the device and change the "Paper Type" from "Plain" to "Heavy" or "Bond." This increases the heat of the fuser roller, ensuring the toner sticks to the page.
• Inspect the Imaging Drum: Open the front door and look at the green/blue cylinder (the drum). If you see a thick line of toner buildup or a physical scratch on the surface, the drum may have been damaged during shipping. If the drum is defective, the toner will not adhere regardless of how full the tanks are.
• Verify Toner Flow: If the tanks were filled manually for the first time, ensure the fill-cap was seated correctly. If air is trapped in the tank, it can create a vacuum that prevents toner from flowing into the cartridge. Remove and reseat the toner tank lid to break the vacuum seal.

Heads Up

• Avoid Manual Shaking: Never shake the toner cartridge vertically or upside down; this can cause toner to leak into the internal electronics of the 2604sdw, which is nearly impossible to clean without professional disassembly.
• Use Correct Toner: Only use the specific HP Tank toner refills designed for the 2600 series. Third-party powders often have different particle sizes that will clog the narrow delivery tubes of this specific model.
• Drum Life: Remember that while the toner tanks last a long time, the imaging drum is a wear-and-tear part. If faint printing returns after several thousand pages, it is time to replace the drum unit, not the toner.
• Environment: Keep the printer in a climate-controlled area. Extreme humidity can cause the toner powder to clump in the tank, leading to the same faint printing symptoms you experienced at setup.