This is the picture of the battery of green laser pointer

This is the picture of the battery of green laser pointer . 
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).  green laser pointer sells better at the Christmas.
No panel lights and some models need to be supplied print software installed on your computer and with the connection, the computer screen will display the current work status screen and voice prompts, according to the corresponding parts of these tips check. Laser printer circuit design quite well, it uses a multi-level protection measures and the order of switching circuits, the failure rate is very low. So when the printer fails, first rule out other improper operation and material not suitable for the problem, do not rush to disassemble the printer, first turn off the power switch, so the printer temperature down after a reboot, to see whether to clear the fault, if fault phenomenon still further maintenance. The school has imported a large quantity of green laser pointer .
Because laser printers are a lot of failures caused by a temporary error, so do the means to restart the printer self-test function, the error failed to restore order. Also to be noted that many parts of laser printers, such as the cartridge components, fusing assembly, rollers and other components are consumed, to be regularly replaced. Asked: Just like a doctor with a patient like to ask the operator to use the printer, to buy time to find out the printer, print size of the workload, frequent use of what kind of print media and so on.  green laser pointer is very common in the school.The green laser pointer compass has the higher cost performance
Laser since the 20th century, following the atomic energy, computers, semiconductors, after another heavy human [1] great invention, known as the "fastest knife," "the most accurate of the foot," "the brightest light" and "strange the laser. " It's brightness of the sun's 10 billion times. Its principle as early as 1916, the famous physicist Albert Einstein has been found, but until 1960 was only the first successful laser manufacturing. Laser is in a theoretical preparation and production practices in the context of the urgent need emerged, and it come out, you get extraordinary fast development, the development of not only the old laser optical science and optical technology gained a new life, and lead to the emergence of a new industry. Laser allows people to effectively use advanced methods and means unprecedented, unparalleled benefits and to get results, so as to promote the development of productivity.