There are many different types of idiopathic headache with the pain in the back of the head, including epicrania fugax, nummular headache, cluster headache, and hemicrania continua. There is also a condition termed new daily persistent headache, which also belongs to this type and can cause a headache for several months.
Calculate Use: Multiply the number of pages per week (the average in a production environment is 100) by the number of weeks in a six-month period (26). A good estimate is that you will print 2,600 pages each six months. Now, take 2,600 and divide it by the number of pages the ink cartridge will print (225).
There are also Combo Savers (4 cartridges in one pack) available, like the HP 950XL Black and 951 Tri-color (Cyan, Magenta, Yellow) Combo Saver. Replace the cartridges. 1. Turn the printer on by pressing the power button (#9). 2. Pull out main input tray (#7), load paper and slide in the input tray.3. Open the ink cartridge access door (#1). Wait until the print carriage stops moving before proceeding. 4. Find the cartridge you want to replace.Press the front of the ink cartridge to release it, and then remove it from the slot.. Open the ink cartridge access door (#1). Wait until the print carriage stops moving before proceeding. 4. Find the cartridge you want to replace. Press the front of the ink cartridge to release it, and then remove it from the slot.