HP Photosmart 7510 Missing Colors? How to Clean a Clogged Printhead (Step-by-Step)

Quick answer: If your HP Photosmart 7510 is skipping magenta, photo black, or any other color even with full cartridges, the printhead is almost certainly clogged. The fix is a 10–15 minute soak in warm distilled water, followed by thorough drying and 2–3 automated cleaning cycles. Full step-by-step instructions are below. If the clog won't clear after two soaks, the printhead (HP part CN642A) may need replacement.

Why the Photosmart 7510 Clogs (Especially With Third-Party Ink)

This is one of the most common failures on the HP Photosmart 7510, and it does happen a bit more often with compatible or remanufactured cartridges — not because they're low quality, but because their ink formulations can dry in the nozzles slightly faster than HP's original ink. After years of reliable printing, cumulative buildup finally plugs a nozzle channel and a color drops out.

The good news: the 7510 has a user-removable printhead, which most newer HP models don't. That means you can clean it at home without sending the printer anywhere. If you're running HP 564XL compatible cartridges in this printer, a simple weekly test print plus the soak procedure below will usually keep it running for years.

Before You Start: Run the Built-In Cleaning Cycle First

Before pulling anything apart, try the automated cleaning from the printer's touchscreen:

1. Touch Setup → Tools → Clean Printhead.
2. Let it finish, then print a Print Quality Diagnostic Report.
3. Run it 2–3 times in a row if the first pass didn't fully clear the bars.

If missing colors persist after three automated cleanings, it's time for a manual soak. For HP's official troubleshooting walkthrough, see their Photosmart 7510 "Color or Black Ink Not Printing" support document.

What You'll Need

• Distilled water (not tap — minerals can worsen the clog)
• A shallow dish
• Plastic wrap or small zip-top bags
• A lint-free cloth or coffee filter
• Isopropyl alcohol (optional, for contacts)
• A few hours of drying time — ideally overnight

How to Clean the HP Photosmart 7510 Printhead (The Soak Method)

1. Power on and open the access door. Turn the printer on and open the cartridge access door. Wait for the carriage to move to the middle.
2. Remove all five ink cartridges. Wrap each one in plastic wrap or a small zip bag so they don't dry out while they're out of the printer.
3. Unlock and lift the printhead. Lift the gray lever on the right side of the carriage, then lift the printhead straight up and out.
4. Prepare the soak. Put about 1/2 inch of warm (not hot) distilled water in a shallow dish. Distilled water is critical — tap water has minerals that can further clog the nozzles.
5. Position the printhead carefully. Set it in the dish so the nozzles on the bottom are submerged, but keep the gold electrical contacts on the side above the water line.
6. Soak for 10–15 minutes. You should see magenta and black ink bleeding out into the water — that's the clog dissolving. If the water gets very dark, pour it out and repeat with fresh water for another 10–15 minutes.
7. Blot the nozzles gently. Lift the printhead out and gently blot — don't wipe — with a lint-free cloth or coffee filter.
8. Dry completely. Let the printhead air-dry for at least a few hours, ideally overnight. Reinstalling a wet printhead can short it out.
9. Clean the electrical contacts. While it dries, clean the copper contacts inside the carriage (where the printhead sits) and the matching contacts on the printhead with a lint-free cloth lightly dampened with distilled water or isopropyl alcohol.
10. Reinstall everything. Put the printhead back in, push the lever down, reinstall the cartridges, and close the door.
11. Run Clean Printhead again. From Setup → Tools → Clean Printhead, run it 2–3 times in a row.
12. Verify with a diagnostic page. Print another Print Quality Diagnostic Report and confirm all five color bars are solid.

What If the First Soak Doesn't Fully Clear It?

If the first soak produces partial improvement but a color is still weak, repeat with a longer soak — a few hours, or even overnight. Stubborn clogs often need a second pass. Between soaks, change to fresh distilled water and let the printhead fully dry again before reinstalling.

When to Replace the Printhead Instead

If after two thorough soaks the magenta and photo black still won't come through, the printhead itself has likely reached end of life. Printheads are considered a wear item — they eventually fail electrically, and the 7510 has been on the market long enough that this is a realistic outcome.

The replacement part is the HP CN642A printhead, which runs roughly $60–$90 from third-party sellers (availability has thinned as the printer ages). At that price point, it's worth weighing the repair against a new printer, since the 7510 is well out of warranty. If you decide to keep using it, you'll want to stock up on reliable HP 564XL ink cartridge bundles for the Photosmart 7510 so you're not caught short.

How to Prevent Future Photosmart 7510 Printhead Clogs

Regardless of how this round resolves, the single most effective thing you can do is print at least one page per week — even a test page counts. Nozzle drying is driven almost entirely by inactivity, and aftermarket inks are a little less forgiving about long idle periods than HP's original ink. A few other habits that help:

• Always power the printer off using the Power button on the unit itself, not a surge strip. This lets the printer cap the printhead properly.
• Keep the printer somewhere climate-stable — heat and dry air accelerate drying inside the nozzles.
• Replace cartridges promptly when they run low; an empty cartridge lets air into the channel and dries things out fast.
• Stick with quality replacement cartridges. Castle Ink's HP 564XL magenta and HP 564XL yellow cartridges are engineered for the Photosmart 7510 and come with a satisfaction guarantee.

Frequently Asked Questions

Why is my HP Photosmart 7510 not printing certain colors even though the cartridges are full?

Almost always a clogged printhead. Ink dries in the nozzles — especially after long periods without use — and blocks a color channel. The soak procedure above clears it in the majority of cases.

Can I use tap water to clean the printhead?

No. Tap water contains minerals and chlorine that can leave deposits inside the nozzles and make the clog worse. Always use distilled or filtered water.

How long should I soak the Photosmart 7510 printhead?

Start with 10–15 minutes. For stubborn clogs, extend to a few hours or overnight. Just keep the gold electrical contacts above the water line at all times.

Can I use alcohol to clean the printhead nozzles?

Use isopropyl alcohol only on the electrical contacts, never on the nozzles themselves. Alcohol on the nozzle side can cause the printhead layers to separate and ruin it. Distilled water only for the soak.

What is the replacement printhead part number for the Photosmart 7510?

The replacement printhead is HP CN642A. Expect to pay $60–$90 from third-party sellers; availability is getting tighter as the 7510 ages out of the market.

Do compatible cartridges cause printhead clogs?

Not directly, but some aftermarket ink formulations dry a bit faster than HP's OEM ink, so gaps between prints matter more. Printing at least once a week and using quality remanufactured cartridges from a reputable supplier largely closes the gap.

Will cleaning my printhead void my HP warranty?

The Photosmart 7510 is well past its original warranty period, so this isn't a practical concern. HP's own support documentation even walks through a manual soak procedure as a last-resort fix.