If your HP LaserJet takes two consumables — a toner cartridge and an "imaging drum" — you have one of HP's compact designs where the long-lived drum is sold separately so the toner cartridge can be cheaper. Knowing which part does what saves money twice: you do not replace a drum when the toner is low, and you do not keep swapping toner when the drum is worn.
What each part does
Toner cartridge: holds the toner powder and the developer roller that carries it to the drum. Consumed by pages printed; rated 1,000–3,500 pages on these models.
Imaging drum: the green or blue photosensitive cylinder plus the charge roller and cleaning blade. The laser writes the image on it, toner sticks to the written areas, the paper takes the toner from it. Wears by rotations, not toner used; rated 12,000–23,000 pages.
Which printers, which parts
| Printer family | Toner | Drum |
|---|---|---|
| LaserJet Pro M102, M104; MFP M130, M132 | HP 17A | HP 19A (~12,000 pages) |
| LaserJet Pro M118, M203; MFP M148, M227; Ultra M230 | HP 30A / 30X, HP 94A / 94X | HP 32A (~23,000 pages) |
| LaserJet M107, M109, M110, M111; MFP M135, M137, M139, M141 | HP 105A/106A/107A, 110A | HP 120A (~12,000 pages) |
Which one is worn? Read the symptom
- Print fading evenly, one side first, improves after rocking the cartridge: toner.
- Uniform gray on every page even with new toner: drum.
- Sharp vertical line in the same spot on every page: drum (scratch) — or debris on it.
- Repeating marks about 75–95 mm apart: drum.
- Background tint over the whole page: drum charge roller worn, or humidity.
- "Drum unit low / very low" on the panel: the drum's page counter; the printer keeps printing but quality declines.
Replacement rhythm
Expect four to eight toner cartridges per drum on these printers. Keep a drum in stock once the printer passes about two-thirds of the drum's rated pages; the panel warning arrives a few hundred pages before the end. Replacing the drum early because of one streak is rarely needed — clean the laser window and reseat the drum first.
Handling the drum
The photosensitive surface is damaged by fingerprints and by light. Remove the new drum from its bag only when ready to install, keep the protective cover on until it is in the printer, never touch the green surface, and do not leave an exposed drum in room light for more than a few minutes. Reuse the bag and box to send the old drum to HP Planet Partners.
Cost per page with a separate drum
Add the drum's cost divided by its yield to the toner cost per page: typically 0.3–0.6 cents. Even so, these printers are often cheaper per page than models with the drum inside every cartridge, because the toner cartridge is simpler and the drum lasts many cycles. Find the correct toner and drum pair for your model with the printer cartridge finder.
Genuine cartridges mentioned in this guide
- HP 19A Imaging Drum
- HP 32A Imaging Drum
- HP 120A Imaging Drum
- HP 17A Toner Cartridge
- HP 30A Toner Cartridge
- HP 94A Toner Cartridge
Related guides
Frequently asked questions
What is the difference between a toner cartridge and a drum?
Toner is the powder that forms the image; the drum is the light-sensitive cylinder that carries the image and transfers it to paper. On most HP LaserJet Pro cartridges the drum is built into the toner cartridge. On some compact models it is a separate, longer-lived unit.
Which HP printers use a separate drum?
LaserJet Pro M102/M104 and MFP M130/M132 (toner 17A, drum 19A); LaserJet Pro M118/M148/M203/M227 and Ultra M230 (toner 30A/30X or 94A/94X, drum 32A); LaserJet M107/M109/M110/M111 and MFP M135–M141 (toner 105A/106A/107A or 110A, drum 120A).
How often do I replace the drum?
Roughly every 12,000 pages for the 19A and 120A and about 23,000 for the 32A — several toner cartridges per drum. The printer warns when the drum is near end of life.
