Irish FOUND Flush With Success After Waste Water Research

- Jul 26, 2018-


Maintenance Knowledge Of PCB

Circuit board maintenance is a new repair industry. In recent years, the degree of automation of industrial equipment is more and more high, so the number of industrial boards in various industries is also more and more, industrial Control board damage, replace the high cost of circuit board (less than thousands of yuan, or tens of thousands or hundreds of thousands of yuan) also become a very headache for enterprises. In fact, the vast majority of these damaged circuit boards in the country can be repaired, and the cost is only to buy a new board of 20%-30%, the time is also more than the time of the foreign fixed board much shorter. The basic knowledge of circuit board maintenance is described below.
Almost all of the circuit board maintenance has no drawing material, so many people are skeptical about the circuit board maintenance, although various circuit boards vary widely, but the constant is that each circuit board is composed of various integrated blocks, resistors, capacitors and other devices, so the circuit board damage must be one or some of the device damage caused, circuit board maintenance idea is based on the above factors established. Circuit board maintenance is divided into two parts, testing and maintenance, which occupies a very important position. Test the basic knowledge of each device on the circuit board until the bad pieces are replaced, and then the circuit board is repaired.
Circuit board detection is the process of locating, confirming and correcting every electronic component fault on the circuit board. In fact, the whole testing process is the thinking process and provide logical clues to the testing process, so the testing engineer must be in the circuit board maintenance, testing, overhaul process, gradually accumulate experience, continuously improve the level. General electronic equipment is composed of thousands of components, in maintenance, overhaul, if the direct one by one test to check each component in the circuit board to find the problem will be very time-consuming, implementation is also very difficult. Then, it is an important maintenance method to check the fault phenomenon to the fault reason. As long as the circuit board detects the problem, the maintenance is easy. The above is the basic knowledge of circuit board maintenance.

Detailed Specification of  Fr4 PCB

1Layer1-22 layer
2MaterialFR4, CEM1, Aluminium Base, Cooper Base,
High frequency material 
Thick copper foil,94-V0 (HB), PI Material, Roger,
High TG:SL S1000-2,ITEQ:IT180.
3Board thickness0.2mm-7mm
4Max.finished board side610mm*1200mm
5Min.drilled hole size0.25mm
6Min.line width0.075mm(3mil)
7Min.line space0.075mm(3mil)
8Surface finish/treatmentHASL,OSP,Immersion tin,Immersion Gold
Immersion Silver/Gold Finger ,Gold Plating,
Selective OSP Immersion Gold
9Copper thickness0.5-4.0oz
10Solder mask colorgreen/black/white/red/blue/yellow
11Inner packingVacuum packing,Plastic bag
12Outer packingStandard carton packing
13Hole tolerancePTH:±0.076,NTPH:±0.05
14Profiling PunchingRouting,V-CUT,Beveling
15Assembly ServiceProviding OEM service to all sorts of printed
circuit board assembly

What products Found can supply?
   Found supplies fr4 PCB,PCBA,FPC and assembly.
What kind of material Found can produce with?
     Found offers CEM1,CEM3,FR4,Aluminum substrate,etc.
What kind of surface finish Found can make?
   Found can make HASL lead/lead free,gold finishing.

Our Mission:
Credit on Customers/Focus on Quality/Rely on Management/Keen on Improvement

Requested information for fr4 PCB: 
1. Gerber file & BOM list if possible
2. PCBA Samples
3. Testing procedure & Testing fixtures
4. Order Quantity
5,ODM Capability:
Till now we have successfully developed Analogue high performance FM transmitter, Wide frequency 
stereo transmission circuit, SSB communication system, High performance wave receiving antenna, 
Digital Frequency Hopping Radio Set, Digital Addressing communication system, etc. Moreover, We 

fulfill establishing DNC Wireless to specialize in wireless module as 0-3000MH