Before Replacing An Image Drum, What Should You Do First? How Do I Know When To Replace A Drum Unit

Everyone who owns a laser printer is familiar with replacing a toner cartridge. Not everyone is as familiar with drum units. So before we go any further, let’s define them both:

What’s the difference between a drum unit and toner cartridge?

The toner cartridge is the container that holds the toner powder. The drum unit is an electrically charged cylinder that fuses that toner powder onto paper to create text and images.

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Both of these components are essential for producing a print. Depending on what printer you own, you might be used to replacing your drum unit occasionally, or you may have never had to replace a drum unit. So, why the inconsistency? It is all contingent on the design of your printer. A drum unit can be incorporated with the toner cartridge or sold separately as a single unit, depending on the consumable requirements of your printer. Laser printers and their consumables vary across printer models. Some printers only need you to replace the toner cartridge, and others require that you regularly replace both the toner cartridge and the drum unit. Consult your printer’s user manual to determine what consumables are appropriate for your machine.

This is what a drum unit with a toner cartridge looks like:


This is what a drum unit looks like without the toner cartridge:


Most printers use toner cartridges with the drum unit built into the cartridge.

HP Toners Have an Incorporated Drum

If you own an HP laser printer, for example, the drum unit is likely incorporated into the toner. Therefore, there is no need to replace the drum separately. Every time you buy a new toner for that HP printer, you are replacing the drum.

Brother Toners and Drum Units Come Separate

Some printers, like most Brother laser printer models, use a separate toner and drum unit. In this case, the drum unit is not built into the toner, and therefore, must be replaced. Separate drum units last quite a bit longer than a toner cartridge and typically should be replaced after the use of 3-4 toners. Your printer should inform you when it’s time to replace the drum, but you can usually tell your drum is on it’s last legs if you start to see black spots or lines across the page.

Do all new laser printers come with a toner and drum?

Yes, most laser printers come with a starter toner cartridge (and drum, if applicable) already installed.

Why do I need a drum?

Without a drum unit, the toner powder in the cartridge cannot be transferred onto the page. The two parts work together to create a print! You can’t have one without the other and expect the printer to work properly.

Do I have to buy a separate drum unit?

It depends on the brand of your laser printer. Most HP laser printers have the drum unit incorporated into the toner cartridge. But for Brother laser printers, the drum units come separately so you will need to replace these in addition to the toner cartridges. It shouldn’t be a bother because it takes quite a bit of time before the drum unit needs to be replaced.


Which type of printer is better?

There is no real winner here in terms of a “better” printer. Printers that use toners with an incorporated drum unit work just as well as printers that use a separate toner and drum.

The only contrast worth noting is the price of consumables and how that pricing affects their replacement.

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Toners with an incorporated drum tend to be a bit more expensive than a solitary separate toner. 

That price increase makes sense too, you are essentially paying a premium for a new cartridge and drum unit whenever you run out of toner.

To illustrate let’s compare two printers: the Brother HL-L2340dw printer which uses a toner cartridge and drum unit (the TN630 and the DR-630 respectively), and the HP LaserJet P1102w printer which uses an integrated toner-drum unit (the HP 85a).

Brother HL-L2340dwHP LaserJet P1102w
How many pages can each cartridge print How many pages can each cartridge print
Brother TN-630 1,200 pages $38.99 HP 85A 1,600 pages $71.99
Brother DR-630 12,000 pages $85.99
To print 4,800 pages, your cost will be:
Brother TN-630 and DR-630 combo $190.32 HP 85A $215.97

The comparison above confirms what we mentioned earlier: that the Brother printer with the separate toner and drum unit is more economical than the HP LaserJet P1102w with the integrated toner-drum unit.

Buying a new toner/drum combination every time ensures your print quality is consistent throughout the life of your printer, but that premium cost adds up, especially if those cartridges are upwards of a hundred dollars. The price breakdown of a separate toner and separate drum unit is slightly different. Separate toners are generally less expensive since you are just paying for the container part that holds the toner powder. The technology is not quite as complex as a toner/drum combination cartridge, so it doesn’t cost as much to produce.

Keep in mind, the drum unit will need to be replaced eventually, as we mentioned previously, a drum is typically replaced after the use of 3-4 toners. Drum units can cost at least a hundred dollars or more, so an added expense will ultimately come into play. What type of printer is best is all up to customer preference. Some customers prefer paying a bit more for toner with an incorporated drum, that way they don’t have to worry about diminished print quality over time, or need to go out and buy a separate consumable whenever their prints get spotty. Others might prefer the immediate cost savings of a separate toner cartridge, and don’t mind investing in a new drum occasionally.

Whichever printer type you go with, make sure you factor in the price of the cartridges and the drum (if required), so have a clear understanding of replacement costs over the long term.

To save more on laser printers, you should consider using compatible toner cartridges and drum units. For instance, a compatible Brother DR-630 drum unit only costs $26.00 whereas an original Brother DR-630 will run you $85.99 making the compatible option 70% cheaper.

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To get a better understanding of how a separate toner cartridge and drum unit install in a Brother laser printer, check out our video below. If you are wondering why we don’t have a similar video for a toner with an incorporated drum unit, it’s because the installation process is as simple as installing a toner cartridge, all you have to do is slide the toner into your printer!

We hope you found this explanation helpful. If you have any questions about your toner or drum cartridge, or have a laser printer that you’d like to recommend, drop us a line in the comments section below.


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