Hotel and restaurant managers, teachers, NGO field offices and agricultural cooperatives rely on yellow more than they notice. Yellow creates the greens in farm maps and crop reports, the oranges in safety notices, and the warm tones in printed menus from Diani to Naivasha. When yellow runs out, the OfficeJet Pro halts every job, including plain black memos, since all four slots must hold ink. The HP 938 Yellow Ink Cartridge restores printing with a sealed original that the printer accepts straight away. At about KSh 5.63 per colour page, the HP 938 Yellow Ink Cartridge stays easy to budget.

Where most Nairobi electronics shops leave you guessing about age, Mascom International publishes the pack date for each colour we stock. At Mascom International, we're seeing hotels and lodges order yellow and cyan together before peak season, since green-heavy menus and maps use both. Satisfied customers throughout Kenya report brighter greens and cleaner oranges once they move back to original yellow. Order from Mombasa, Nyeri or Machakos and pay on arrival, or walk in to our Kimathi Street shop for same-hour collection.

Yellow hides inside most colours you print. Mixed with cyan it makes every green, and mixed with magenta it produces reds and oranges. Photos, maps, logos and charts all draw on it, even when nothing looks obviously yellow. That is why the printer's yellow gauge drops steadily during ordinary colour work. And because the OfficeJet Pro 9100 and 9700 series stop entirely when one slot is empty, a dry yellow can block black-only letters too.

It is the date HP prints on the pack, and it marks the end of HP's recommended window for that cartridge. HP's warranty runs until the ink is used up or that date is reached, whichever comes first. August 2027 leaves close to a year, which is plenty for an office that changes yellow every month or two. If you are stocking several spares, install this one first and keep later-dated colours behind it.

HP rates it at about 800 A4 pages at the ISO test coverage of roughly 5% per colour. A restaurant printing 40 menus a week with green and orange sections can expect several months from one cartridge. Full-page posters and photo-heavy school handouts use more, sometimes halving the yield. The printer panel and the HP phone app show the remaining level, so you can reorder a week before it runs dry.

The HP 938 yellow fits the HP OfficeJet Pro 9110, 9120, 9130, 9720 and 9730 series. That covers the business and home office versions sold in Kenya, such as the 9110b, 9120b, 9125e, 9130b and 9135e. The 9720 and 9730 are A3 wide-format all-in-ones. Printers bought in the United States use the 936 number instead, so check the model on the front panel before ordering.

Often, yes. Refilled yellow can print a dull mustard tone, which turns greens muddy and oranges brown. Uneven flow also leaves pale streaks across large coloured areas, which is obvious on menus and safety posters. Original HP yellow matches the cyan and magenta calibration inside the printer, so greens look like grass rather than olive. For hotels in Watamu or lodges in the Maasai Mara printing guest materials, that difference shows immediately.

Buying one or two spares per printer is sensible, but not a large bulk order. Each cartridge carries a pack date, and this one runs to August 2027, so stockpiling ten could leave some unused past that window. A school printing weekly colour handouts will typically use one yellow per four to six weeks. Order the rest as needed, since Mascom International delivers same day in Nairobi and next business day to major towns.

Turn the printer on and open the ink access door, then wait until the carriage stops. Press the front of the empty yellow cartridge to release it, and lift it out. Take the new cartridge from its packaging, hold it by its sides, and avoid touching the copper strip. Slide it into the yellow slot and push until it clicks. Close the door, and the printer will check the chip before printing again.

Open the door and push the cartridge down firmly until it clicks into place. Confirm it is in the yellow slot, then clean the copper contacts gently with a dry, lint-free cloth. Restart the printer and check for firmware updates through the HP phone app. If a sealed cartridge bought from Mascom International still is not detected, send us a photo of the error on WhatsApp or bring it to Kimathi Street for assessment and replacement.

Yes, with some care. HP rates sealed storage from 0 to 40°C and humidity from 5 to 80%, which suits most of Mombasa, Kilifi and Lamu indoors. Keep spares in a closed cupboard, away from windows and the top of the printer, where heat builds up. Do not leave cartridges in vehicles parked in the sun. Using the cartridge within its pack date gives the steadiest colour in warm climates.

Three ways to order:

The HP 938 Yellow Ink Cartridge is covered by the HP and Mascom terms stated above.

Mascom International serves schools, hotels and offices nationwide with dated, sealed original ink, current Kenyan pricing and direct after-sales help from our Nairobi CBD store.