more than 50 pieces at least for this kind of Cell Phone Jammers

Rubber after aging can not be restored, only the renewal of the.  
 As the drum maintenance, and can be carried out: carefully remove the cartridge assembly, wipe the surface with a clean cotton flower, but not force, to prevent the drum surface scratched. Cartridge with the cotton flower dipped in cleaning agents wipe the drum surface. Circle type spiral should be taken when cleaning methods, polish with a cotton flower immediately after the cleaning wipe. With talcum powder with gauze in the drum beat gently on the surface of a layer of talcum powder, can be loaded back to use.
Surface modification process.
What is called "stimulated emission"? It is based on the great scientist Albert Einstein in 1916 proposed a new set of theories. The theory is that the atoms in the composition of the material, there are different number of particles (electrons) in different energy levels, in the high level of particles excited by a photon, will jump from a high energy level (transition) to a low level, then it will radiate light and excitation light of the same nature, and in certain conditions, can stimulate the emergence of a low-light glare of a phenomenon. This is called "light amplification by stimulated emission of radiation", referred to the laser. There are four main characteristics of the laser: laser high brightness, high directivity, high color and high coherence.
Warning: there are provisions in the manual which parts can be cleaned and what parts can not be cleaned up. For the most part, the touch, or added lubricants are quality printer may have the opposite effect, and even quickly lead to rapid paralysis printer. Laser printers use heat method toner on paper, so just completed a task, do not clean the printer, to prevent burns. Can be a clean internal parts: Toner protection devices, feed rollers, vents. Recommended laser printer cleaning paper. It can better help you thoroughly clean the printer. The ordering quantity of  Cell Phone Jammers  should be more than 50 pieces at least for this kind of  Cell Phone Jammers  .
Clean the external surface: you can use to protect car interior spray, be careful not to accidentally spray sprayed into the inside of the machine. Shake the cartridge: This is a preventive maintenance tips that can help extend the cartridge life. Remove the cartridge from the printer to maintain the level, along the axis of rotation to maintain the toner distribution to prevent their agglomeration or deposition, resulting in spots or stripes after printing. The ordering quantity of  Cell Phone Jammers  of this month has exceeded the predicted quantities.