Any printer consumable, may it be cartridge, drum, fuser or anything, they have this we called life expectancy. It is a duration from which such product will turn obsolete once it meets its end of life. Well it is normal, any consumable item has an expiry date right? Albeit, printer supplies doesn’t expire they only turn used or empty once consumed.
Unfortunately, your printer may prompt a low level or empty error message earlier than expected. But you shouldn’t blame the unit itself because in fact you are the one who should know very well why it wasn’t able to reach its expected limit.
The HP Color LaserJet 2550’s imaging drum has an approximate usage life of 20,000 pages more or less. However it is still dependent on the print coverage of monochrome and colored prints from which the item has been used. The figure stated only applies when you are printing mainly black&white documents, no color parts at all. On the other hand, if you’re purely printing colored pages, the numbers will reduce to 5000 pages or even less.
Likewise with the HP 2550 set of toners, their page capacity depends on the type of document you will use it. Sometimes you will have to buy new stocks in a month or so, then the next time shorter than a month, it’s basically normal. There’s no fix schedule for it since it will depend on the amount of pages you print and the toners each page consumed.
Difference between Low-Life and Out-of-Supply
When the printer says one of the cartridges are running low of toner that actually means it will soon reach its end of life. Approximately, there’s about 20% of life left inside that cartridge, hence you can still get some more prints. Consider it a signal for you to rush to your retailer and get a replacement before it totally gets empty.
Now, if the machine prompted you with a cartridge out of supply notice, it is not just a warning, it is literally empty. Let’s say there’s 3-5 percent of toners left, maybe that’s enough for a single page, but don’t push your luck.
If the printer doesn’t get new replacements it will shut itself down. Just kidding, it will actually stop from printing instead. So to avoid delays, it would be ideal to stock some supplies that you can use anytime you needed. It’s a good thing that these consumables don’t expire, so take advantage of it.
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The fundamental distinction is obvious from previous responses, but I'll focus on the commercial aspect. Almost every printer company used to offer printers at 'lower cost.' They devised methods to discourage consumers from using cartridges from other brands, allowing them to profit handsomely from the cartridges. The cost of printing at home was substantially greater for consumers, especially home users. In fact, I discovered that purchasing picture prints from a store was far less expensive than printing at home. As a consequence, many consumers began to use their printers less often over time, resulting in a decrease in printer sales.
To combat this, Epson, which was the worst impacted, flipped the business model on its head. It planned to sell the printer for a profit, but instead of using cartridges, it would use ink tanks. Other firms followed suit, and today every major corporation sells ink-tank printers. The claims range from 8000 to 15000 pages per tank, depending on the type or manufacturer. That effectively implies that after the first fee is paid, the only further expense is the paper, since printing upwards of 8000 pages for residential users would take a very long time.