This is the picture of the battery of Laser Pointers

This is the picture of the battery of Laser Pointers .
Single parts are exposed to wear and tear from the point of view, dealing with different print job is not the same, know that you can easily understand that these are also used after a cycle of toner cartridges, which contains why the different parts of the state, which renovation industry is the use of old pieces of the difficulty encountered when one of the old pieces are vastly different. Rotating components wear: We all know that in the printing process drum, magnetic roller, charging roller are constantly rotating in the process of rotating parts subjected to wear and tear associated with the completion of one cycle of printing tasks, printing and continuous printing page after page of wear experienced by great distinction, with the EX drum, for example, every time you print a drum circle to turn 9, if a page to print. The battery of Laser Pointers should be changed regularly.
6,000 pages in a print cycle, the drum circle of rotation 54000; if each print job is set to 5, the same task to complete 6000 print drum to rotate 25000 circle, the greater the drum that print jobs withstand the wear and tear smaller, the magnetic roller and charge roller, too, so remember that print on continuous wear of the smallest parts. Wear and tear on the parts toner: toner on the relevant parts are worn, imaging and non-image areas are exposed to wear and tear is different, even though every day dealing with the same print job is not much, but we need to know this circumstances the use of components is the most unreasonable.
For example when you want to test has nothing to do with the blackness of the components, with no need to ask its parts have to meet the requirements of the blackness, no need to use qualified to do this with the production of materials testing, and this is one of your cost of test methods, especially in the development of new products, to test the wear resistance of many parts, the use of expired toner and some performance parts also failed to complete the task, and so the choice of too much, do not go into here , we need to work flexibly. The battery of Laser Pointers shouldn’t pollute the environment. 
Therefore, maintenance, be sure to check and determine the failure to grasp the correct way. Dismantling can not be blind, so as not to expand the fault. In general, more mid-range models, as long as the main supply power supply is working properly, failure will show fault code, according to the meaning of the code, check the corresponding fault location (such as HP, Canon, Epson and other high-end printer, work has shown the status of the "display"). Mid-range models have adopted the following panel lights to indicate working status and failure meaning, according to the indicator status and meaning of troubleshooting (such as HP 4L, 6L and other models).  Laser Pointers sells better at the Christmas.