PCB fabrication concept: PCB manufacturing begins with a PCB “substrate” made of Glass Epoxy or similar materials. The first step of fabrication is to design the wiring of the on-line PCB between the parts by using the method of Subtractive transfer to “print” the line negative of the designed PCB board on the metal conductor.

The trick is to spread a thin layer of copper foil over the entire surface and remove any excess. If you’re making a double-panel PCB, copper foil will cover both sides of the substrate. And want to do multilayer board to be able to do two double face plate with tailormade adhesive “press close” rise went.

Next, the drilling and plating required to plug in components can be carried out on the PCB board. After being drilled by the machine as required, the holes must be Plated inside (Plated through-hole Technology, PTH). After making metal treatment inside the hole, the internal lines of each layer can be connected to each other.

The holes must be cleared of debris before plating can begin. This is because the resin epoxy will produce some chemical changes after heating, and it will cover the internal PCB layer, so it should be removed first. Cleaning and plating are done in a chemical process. Next, solder paint (solder ink) is applied to the outermost PCB design wiring so that the PCB design wiring does not touch the plating part.

The various component labels are then printed on the circuit board to indicate the location of each part. It should not be overlaid on any PCB design wiring or gold finger, otherwise it may reduce solderability or stability of current connection. In addition, if there is a metal connection, the “finger” part is usually plated with gold to ensure a high quality current connection when inserted into the expansion slot. Finally, there’s the test. To test PCB for short circuit or open circuit, optical or electronic test can be used. Optical tests use scans to find defects in layers, while electronic tests typically use a flyprobe to check all connections. Electronic testing is more accurate at finding short circuits or breaks, but optical testing can more easily detect problems with incorrect gaps between conductors.

PCB substrate well, after a finished piece of main board is on the PCB substrate equipment according to need a variety of large and small components – use SMT automatic placement machine first IC chip and SMD components “welding, manual plug some machines do the work, through the wave/reflow soldering process the splice components firmly fixed on the PCB, A motherboard was produced. Treatment method: Floor class:

1, the maintenance of the floor: maintain wood floor, must protect the paint film of its surface above all, cannot hurt its “appearance”, nevertheless, as a result of the paint film of wood surface each different, maintain method so also each not identical.

Nitro wood varnish floor: unfavorable wipe with wet cloth or water, lest lose luster and shell. Every lie between half an year or a few months, brush with glazing wax besmear, reoccupy clean cotton gauze next wipe can. Use soft towel or cotton yarn at ordinary times wipe off the dust on paint film can. Pay attention to prevent exposure and smoke.

Broad lacquer and lacquer floor: cannot often wipe with the clear water of low temperature brush.

Get together ammonia fat lacquer kind floor board: unfavorable wipe with water, lest wipe surface fat is qualitative, and reduce the glossiness of the surface. Alcohol acerbity varnish floor: wet cloth or soft towel can be used when using wipe wipe, unfavorable pass hot thing on this kind of floor, cannot cover surface with plastic paper or the thing of a kind of paper. Secondly, the maintenance of the wood floor should also pay attention to avoid heavy metal sharp tools, glass tiles, nail and other hard objects scratching the floor, do not move furniture in the floor surface drag move; Avoid stomping out cigarette butts on the floor and placing acid and alkali objects; Do not directly place the kettle, stove and other high temperature objects.

Wood floor is after using a longer period, appear old phenomenon, should go up in time lacquer. Lacquer method has two kinds: one kind is to go up directly lacquer and coloring, its method and carpentry furniture are same, floor wax on besmear after waiting for dry, 2 it is to do not need any color to make base color, also need not any paint, brush with floor wax directly however. Because wood floor is a kind of natural material, wear well not only, and still can defer as time with each passing day perfect, more natural, especially pure brush wax wood floor, will become all the more bright, smooth, beautiful.

2, the maintenance of the laminate floor

The use of aggrandizement wood floor maintains simpler, want to notice the following points only in daily use, can assure the normal use of the floor.

(1) All wooden floors will change their moisture content with the increase and decrease of humidity or temperature changes, affecting the expansion of the floor. Reason should resemble protect skin same, maintain the reasonable moisture content of the floor.

(2) The floor usually does not need to wax and paint. Do not use sandpaper to polish.

(3) It is recommended to place rubbing MATS at the door to prevent dust particles from entering and damaging the floor.

(4) The stains and oil stains on the floor surface should be cleaned with household cleansers. Do not use a lot of water to clean the floor.

(5) northern dry areas, in winter should pay attention to increase the humidity of the floor surface, with damp mop mop, appropriately increase the surface humidity, can effectively solve the floor gap and cracking. If cracks occur in individual positions, please inform the sales unit in time and fill the parts. After filling, increase surface humidity to facilitate floor recovery.

In rainy season, please close the Windows carefully lest it should rain.

(7) Please pay attention to the maintenance of heating, air conditioning and other indoor facilities to avoid water leakage soaked floor. In case of discovery floor bubble water, should tear open the floor that is soaked by water as soon as possible, in shade place air is dry or timely notice sales unit undertakes processing.

(8) At the door of the toilet and kitchen, attention should be paid to the timely cleaning of water.

(9) Do not drag when handling furniture. It is advisable to lift it.