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It meens that your printer has passed a certain timer count and needs a Mantenance Kit installed, in othe words "a good tune up" because it reached the recommended millage for it...
It means the page count has triggered this message.
You _should_ get a maintenance kit.
But if you simply can't take the time/money, you'll find a new menu item in the menus after service. the new item is 'maintenance', get to there and press enter. (May need to press enter twice), the menu item, flashing light, and install MK message will all disappear.
Its because you've gone past a certain number of pages printed.
Its asking you to install a new Media Kit
To reset the message -
1 Press the MENU key. 2 Press the or key repeatedly until Life Counters > appears. 3 Press the > key. 4 Press the or key repeatedly until >New Toner Installed. appears 5 Press the ENTER key. A question mark (?) appears. 6 Press the ENTER key. The toner counter is reset. The message display returns to Ready.
install MK means replace the maintains kit . maintains kit is belongs to drum ,developer , drive gears ..... after 250000 print it asking to replace all the things ....... this is not harmful the printer it will work fine don't worry about the install mk....
You have done more than 300,000 pages. I wouldnt waste your money on a Maint Kit, just stretch it out by doing the following.
Press Menu/Ok (Main menu) Go into [>>Service] Then press the right arrow. Then find [>> Maintenance] Press the ok key, then it will show [>> Maintenance?] Press the ok key twice, and it will reset all the counts on your consumable components (Drum, Developer, Transfer Roller, ETC)
Machine maintenance(400,000 printed pages) Content of MK : Fuser assembly,Developer assembly,Drum assemby, various feed and other rollers,transfer assembly etc...
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