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Automation Cuts Costs of Surface Mount Assembly

Tuesday, August 23, 2016 10:56:46 AM Asia/Shanghai

Growing demand for smaller and cheaper electronic devices has meant that assembly-line managers face a challenge in bringing down costs. One of the major costs has been the manual testing of printed circuit board assemblies.

Manufacturers have adopted a new strategy of bringing down labor costs by replacing the manual testing with a variety of automatic systems. Some of these have been more successful than others.

One of the most popular solutions has been to replace the manual labor with a robotic arm, while another is an automated inline circuit tester for surface mount assembly.

In this first system, the robotic arm loads the printed circuit board assembly on to the circuit tester. Once loaded, a top cover on the fixture closes automatically and starts scanning. The problem here has been that if the board is misplaced on the tester, it can be damaged by the misalignment. So an operator has to be on hand to adjust the placement manually.

The top cover is pneumatic and also uses a vacuum to ensure that the circuit board is in firm contact with the line. This makes for a very heavy system with a long set-up time.

In addition to the obvious extra labor costs this system entails, the operator is also in danger of being injured by any automatic closing of the top cover. The robotic system also took up more space than the original manual system.

There are also potential human-error problems with the automated inline circuit testing system. The circuit board is carried by a conveyor to the inline testing handler, where a scanner reads the board's bar code. If this is accepted, testing proceeds and the board moves on to the next station on the surface mount assembly line.

This system occupies very little space and is light and easy to assemble. Unlike the robotic arm, it does not require constant supervision by an operator. The problems begin if for any reason the inline circuit tester breaks down. This means that operators must remove all the circuit boards scheduled for testing so that the production operations are not disrupted or the testing procedure has to be bypassed altogether.

However, manufacturers conclude that the automated systems do represent considerable cost savings. The bulk of the costs are in the initial capital investment in equipment.

If you have any PCB or PCBA projects, please feel free to contact Joanna via

Posted in SMT News By joanna joanna

Flux Corrosion Issues in SMT Assembly

Monday, August 22, 2016 1:49:48 PM Asia/Shanghai

Flux corrosion is one of the most common reasons why a customer may reject an SMT assembly product or why the product does not function at all. The important matter is to understand how flux corrosion occurs and to choose the correct flux products for SMT assembly.

Surface mount technology, or SMT assembly, is a process of securing components to a printed circuit board. Soldering is a method of controlling how one metal dissolves into another to form a firm intermetallic bond. The surface of each metal should be free of contamination in particular oxides of any of the metals used. Flux functions as a cleaning and flowing agent by reacting with the metal oxides to produce a clean, oxide- and oil-free surface for the metals to bond.

There are four main types of flux: inorganic acids, organic acids, rosin and no-clean fluxes. Highly corrosive inorganic fluxes are rarely used these days in electronics assembly. Organic fluxes are weaker than inorganic fluxes but environmentally better and stronger than rosin fluxes. However, they are not as tacky as the rosin fluxes. Tackiness is necessary for a solder paste to prevent any movement of the component during its placement.

Rosin flux is made from pine resin and a mixture of organic acids. It dissolves thin oxide layers on the metal. No-clean fluxes are the cutting-edge soldering technology and leave no residue after soldering that requires cleaning or any tacky residue that may attract dust.

Flux corrosion occurs in two main processes. It can be a chemical reaction, where a metal reacts into another compound, or an electrolytic process, when one metal in the solder corrodes faster than another when in the presence of an electrolyte.

Even the new no-clean fluxes have corrosion concerns. The most common effect is when too much of the flux is applied and residues from it are not volatized adequately during soldering. Remaining acids may attack any exposed metals such as copper in the printed circuit board and cause short circuits on the board. Sometimes, a weak flux may react in an unexpected manner when placed on the board.

Flux selection should be made on the basis of recognised industry standards. Users should not rely on data sheets that may be many years old. Most importantly, all stages of the soldering process during SMT assembly should be controlled.


If you have any PCB or PCBA projects, please feel free to contact Joanna via

Posted in SMT News By joanna joanna


Monday, August 22, 2016 10:45:42 AM Asia/Shanghai

In any switching power supply design, physical design PCB board is the last link, if the improper design, PCB can radiate excessive electromagnetic interference, resulting in an unstable power supply, carry out the following matters for the various steps required to pay attention to analysis

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Posted in PCB Technology By judy judy

PCB Circuit Board Design Principles

Thursday, August 18, 2016 10:51:35 AM Asia/Shanghai

The substrate design

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Posted in PCB Technology By nail nail

Double Layer and Multilayer PCB Copy Board Skills

Friday, August 12, 2016 2:59:59 PM Asia/Shanghai

Double Layer and Multilayer PCB Copy Board Skills

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Posted in PCB Reverse Engineering By nail nail

RAYMING press conference of how to solve rough solder problems

Thursday, August 11, 2016 6:30:16 PM Asia/Shanghai

China - PCB design and turnkey SMT assembly demand precision and RayMing Technology, a China based PCB prototyping and manufacturing firm recently addressed the problems that might occur during PCB designing, particularly rough solder problems. The company also announced that they have taken a quality-driven approach to mitigate the errors and problems that might occur during turnkey SMT assembly.
Antti, an engineer from RayMing, recently explained the rough solder issues and analyzed the causal factors in a press conference. She tried to explain the circumstances that eventually lead to rough soldering.
“The temperature factor is the biggest factor that leads to PCB soldering during PCB assembly processes. We need to control the temperature so that the soldering issues do not arise. What we do here at RayMing is we choose the correct preheat temperature so that an appropriate relationship is established. This way, we can successfully avoid soldering issues”, said Antti.
The engineer also went on to explain the other causal factors that contribute to rough solder problems. “Rough or dull solder problems mainly indicate problems in material selection or erroneous processes. If the solder composition is not correct, PCB rough welding may appear. We always check the solder composition to make sure that everything is alright. We also take a couple of other preventive measures to avert soldering issues”, she added during her press conference.
The CEO and managing director of the PCB assembly company also briefly appeared in the press conference and he also spared a few words on the quality benchmarks that they follow. “We have our own R&D team at work. Besides, we strictly follow and comply with ISO9001:2000, ISO14001 and other industry-specific guidelines and standards. Moreover, we also comply with RoHS and UL requirements”, he said addressing the press.
“We started SMT assembly only in 2010 and now we have turned into a full-service electronics contract manufacturer with all the necessary certifications under its belt. We now focus on manufacturing and prototyping ready-to-integrate PCB. We believe that the quality standards we follow will take our business to the level next”, he signed off on a high note.
About the Company
RayMing Technology is a China based PCB manufacturing, prototyping and SMT assembly company .  Skype:raypcb15

Posted in PCB Technology By sally sally

The History of the Printed Circuit Boards

Thursday, August 11, 2016 6:28:15 PM Asia/Shanghai

Printed Circuit Board Definition & The History of the PCB

What is a PC board? When did printed circuit boards first come into usage? 

We created this page to help define what printed circuit boards are and trace their history up to the present day.  Printed circuit boards sure have come a long way since these early days in 1942.  Today, RayMing  manufactures printed circuit boards using the latest materials that allow electronic design engineers to miniaturize their products and build them to withstand demanding environments.

To get where we are today as the China leading PCB manufacturer, with outstanding reliability and Exclusive Services , there had to be an invention and history of the printed circuit board. We invite you to read about the origins of the PCB and how it has been used throughout the 20th and 21st centuries.

Printed Circuit Board Definition & History

To define what a PC board is, we have to look back at history that traces the evolution of printed circuit boards back to the early 20th century. The first PCB patents for "printed wire" were issued in the early 1900's but Printed ciruit boards that we would recognize first came into use after World War II. In 1925, Charles Ducas of the United States submitted a patent application for a method of creating an electrical path directly on an insulated surface by printing through a stencil with electrically conductive inks. Hence the name "printed wiring" or "printed circuit." An Austrian scientist, Dr Paul Eisler, is credited with making the first operational printed wiring board in 1943. It was used as a replacement for bulky radio tube wiring.

 Printed circuit board (PCB) – Used in the 1920's

The earliest PCB's (printed circuit boards) were made from materials like Bakelite, Masonite, layered cardboard and even thin wooden planks. Holes were drilled into the material and then flat brass "wires" were riveted or bolted onto the board. Connections to components were usually made by pressing the end of the brass trace onto a hollow rivet and the component's leads were simply pressed into the open end of the rivet. Occasionally small nuts and bolts were used in place of the rivets. These types of printed circuit boards were used in early tube style radios and gramophones in the 1920's.

By the 50's and early 60's laminates using different types of resins mixed with all sorts of different materials were being introduced but the pcbs were still single sided. The circuitry was on one side of the board and the components on the other. The advantages of the Printed circuit boards over bulky wiring and cables made it a prime choice for new products being brought into the market place. But the largest influence on the evolution of the printed wiring board came from the government agencies responsible for new weapons and communication equipment. Wire ended components were being used in some of the applications. In the beginning the leads of the components were held in place on the board by using small nickel plates welded to the lead after it was placed through the hole.

PCBs(Printed circuit boards)- The Evolution of the Production Process

Eventually processes were developed that would plate copper onto the walls of the drilled holes. That allowed circuits on both sides of the board to be connected electrically. Copper had replaced brass as the metal of choice because of its ability to carry electrical current, relatively low cost and ease of manufacturing. In 1956 the US Patent Office issued a patent for the "Process of Assembling Electrical Circuits" that was sought by a small group of scientists represented by the US Army. The patented process involved using a base material like melamine to which a layer of copper foil had been securely laminated. A drawing was made of the wiring pattern and then photographed onto a zinc plate. The plate was used to create a printing plate for an offset printing press. An acid resistant ink was printed onto the copper foil side of the board that was etched to remove the exposed copper leaving the "printed wire" behind. Other methods like using stencils, screening, hand printing and rubber stamping were also proposed to deposit the ink pattern. Holes were then punched in patterns using dies to match the position of the component wire leads or terminals. The leads were inserted through the non-plated holes in the laminate material and then the card was dipped or floated on a bath of molten solder. The solder would coat the traces as well as connecting the leads of the components to the traces.

They also used tinned eyelets, rivets and washers to attach various types of components to the board. Their patent even has a drawing showing two single sided boards stacked on top of each other with a standoff holding them apart. There are components on the top side of each board and one component shown with its leads extending through the top board into holes on the bottom board, connecting them together, a rough attempt at making the first multi-layer.

Much has changed since then. With the advent of plating processes that allowed hole walls to be plated came the first double sided boards. Surface mount pad technology, something we associate with the 1980's was actually being explored twenty years earlier in the 60's. Solder masks were being applied as early as 1950 to help reduce the corrosion that was occurring to traces and components. Epoxy compounds were spread over the surface of the assembled boards similar to what we know now as conformal coating. Eventually the inks were being screen printed onto the panels before assembling the boards. Areas that were meant to be soldered were blocked out on the screens. It helped keep the boards clean, reduce corrosion and oxidation but the tin/lead coating used to coat the traces would melt during the soldering process causing the mask to flake off. Because of the wide spacing of the traces it was seen more as a cosmetic problem than a functional issue. By the 1970's circuitry and spacing was becoming smaller and smaller and the tin/lead coating that was still being used to coat the traces on the boards began fusing traces together during the soldering process.

Hot air soldering (HASL ) methods began in the late 70's allowing the tin/lead to be stripped after etching eliminating the problem. Solder mask could then be applied over the bare copper circuits and leave only the plated holes and pads free to be coated with solder. As holes continued to get smaller and trace work became more densely packed solder mask bleed and registration issues brought on dry film masks. They were primarily used in the US while the first photo-imageable masks were being developed in Europe and Japan. In Europe the solvent based "Probimer" ink was applied by curtain coating the entire panel. The Japanese centered on screen processes using various aqueous developed LPIs. All of three of these mask types used standard UV exposure units and photo tools to define the pattern on the panel. By the mid 1990's the aqueous developed liquid photo-imageable masks were dominating the industry with specialized equipment designed specifically for their application.

The increased complexities and densities that were driving the evolution of solder mask were also forcing the development of layers of copper traces laminated between layers of dielectric materials. 1961 marked the first use of multi-layer pcbs in the United States. The development of the transistor and the miniaturization of other components drew more and more manufacturers into using printed circuit boards for an increasing number of consumer products. Aerospace equipment, flight instrumentation, computers and telecommunication products as well as defense systems and weapons all began to take advantage of the space saving that a multi-layer circuit board provided. Surface mount devices were being designed that wers wilenth the size and weight of the comparable through hole components. Followed by the invention of integrated circuits the circuit board has continued to shrink in almost every way. Rigid boards and cable applications have given way to flexible circuit boards or combinations of rigid and flexible Printed circuit boards. These and other advancements will keep the manufacture of printed circuit boards a dynamic field for many years.           pcb/pcba design and assembly,welcome contact sally, Skype:raypcb15 

Posted in PCB Technology By sally sally

RayMing PCBA capabilities include:

Thursday, August 11, 2016 6:27:04 PM Asia/Shanghai

RayMing PCBA capabilities include:

  •   Rapid turnaround prototyping service
  •   High mix, low/medium/high volume build
  •   Surface Mount Technology - Process capability for 0201 chips and 0.4mm pitch Ball Grid Array (BGA)
  •   Through-hole pcb assembly
  •   Special processes (such as conformal coating and potting)
  •   ROHS capability
  •   Workmanship to IPC-A-610E
  •   Test solutions include:

             1.Automatic optical inspection

             2.In-circuit test


           3.Reliability test (Hi-pot, vibration, burn in, high and low temperature test)
             4.Analogue and digital functional test
             5.PC based tester development
             6.Firmware programming
             7.Functional verification at board, semi-finished goods and system level
             8.Fulfillment to end customer or user destinations

Box Build 

RayMing is skilled in all elements of assembling electronics into mechanical enclosures, and has rich experience in system integration and high level assembly including Build to Order (BTO) and Configure to Order (CTO).

With strong assembly capabilities and a professional engineering team, our box build services aim to meet customer expectations in terms of quality and reliability, and our 6 dedicated box build production lines, offer flexible and efficient assembly of complete products.

In addition, we have enjoyed more than 5 years deep cooperation with partners in molding, stamping, forming, and injection services, so you can trust Maxway to source high quality extrusions, brackets, housings, and enclosures.

RayMing’s Box Build turnkey services include materials procurement, PCBA, final assembly manufacture, software installation, final test, packaging (including manuals and all accessories), warehousing and shipping directly to customers or the end users.

We control the entire process from procurement of mechanical parts from our vendors, to coordination of all the logistics,so we can ensure we build and deliver your products at the right time, at the right price and the right quality.

 If you have any PCB assembly projects, Pls send your RFQs

Posted in PCB Technology By sally sally

Why customers prefer RayMing's PCB assembly service?

Thursday, August 11, 2016 6:24:23 PM Asia/Shanghai

If you are looking for dedicated PCB assembly and prototyping services, consider the expertise and professionalism of high-end technicians, who have vast experience in the domain. PCB prototyping, assembly, and production demand specialized knowledge and expertise that only a professional analysts possesses, delivering quality solutions in a cost-effective manner. There are several advantages of consulting an experienced PCB assembly expert, ensuring you get a fantastic value for the money. For an experienced and reputable company like RayMing Technology , we do not only offer contract manufacturing but consultation and design service for PCB assembly. Compare to our peers in China, we offer a wider spectrum of services, catering to the discerning needs of our clients globally.


RayMing Technology offers excellent quality and reliable pcb assembly services, leveraging the latest technology to provide tailored solutions to meet your unique requirements. Whether you demand full production PCB assembling or fast turnaround prototyping, the services are carefully selected and monitored to suit your unique needs. At the same time, we ensure that product manufacturing and assembling is achieved as per the regulatory, customer, and environmental requirements. Hiring professional expertise ensures that there is an uncompromised commitment to quality, customer specifications, and on-time delivery.

RayMing Technology  has vast experience in PCB industry, with unmatched capabilities of efficiently handling fine pitch CSP and BGA devices, test capabilities, hand loading, the ability to achieve consigned assembling as compared to turnkey circuit card assembly service, inventory management and control, ability to cross reference the parts, and component procurement capability. It is also important to have the necessary flexibility to achieve machine loading as compared to hand loading, which is an integral component of PCB assembly. At the same time, RayMing Technology specializes in circuit card assembling, providing turnkey solutions in assembling, modules, and systems, with testing and coasting capabilities.

 Typically, the services offered by us encompass the followings:

  • ROSH/lead free PCB assembling and prototyping 
  • High volume assembly and prototype 
  • Surface mount assembly 
  • Through-hole assembly 
  • Mixed technology assembly 

Whether you are a start-up business or a specialty OEM, it is important to build fully functional devices and PCB assemblies on a regular basis. It is also important for building engineering prototypes or getting your first design revised so that you can test and debug, without questioning workmanship. However, for all these, you cannot always just rely on  a pure contract manufacturer since they often lack the knowledge and expertise to deliver customized solutions for diverse PCB assembling needs. This is where professional experts come into picture, offering dedicated PCB assembly services in a cost effective manner. Moreover, their vast expertise in PCB, circuit card assembly, and PWB assembly services further make them a desired choice for small and medium organizations. We are one of the rare contract manufacturer of PCB boards who also excel in PCB designs and prototypes.

PCB assembling services are offered across industries, encompassing military, household appliances, telecommunication, medical and so forth. It is important for the company to be flexible to meet unique needs of the clients. Hiring a professional PCB prototyping, assembly and production company also helps in fantastic cost savings as compared to a pure contract manufacturer who only focuses on the manufacturing aspect of it.

Call us today for your PCB design and manufacturing need. Our top rated customer service and engineers would be happy to discuss with you and come up with a solution for your PCB needs.

 RayMing Provide  One-stop PCB Assembly Services  ,Know more Pls Click Here

pcb/pcba design and assembly,welcome contact sally, Skype:raypcb15 

Posted in PCB Technology By sally sally

Schematic capture

Thursday, August 11, 2016 6:22:03 PM Asia/Shanghai

Schematic capture
- the stage in the PCB design process where the circuit or "schematic" is captured and entered into a computer.

With computer based PCB design and many more computer simulations being used in the design of electronics circuits, the schematic capture or schematic entry stage of an electronics circuit into a computer is now an integral part of the design process. Typically complete software suites are now used, and the schematic capture stage only needs to be undertaken once, and the information used not only for being able to produce a drawing of the circuit, but also data entry into the PCB design as well as circuit simulation, production of the Bill of Materials (BOM) and many other applications.

Schematic capture in the design process

The schematic capture part of the design process is today undertaken interactively. Prior to the schematic capture of the design, the initial high level design must be undertaken. Then in years gone by, breadboards of the circuit would be made up and made to work before committing to the schematic stage. Now with highly sophisticated circuit simulation software, the circuit is designed interactively during the schematic capture stage and the circuit simulated using software rather than building a hardware version of the circuit.

By using a computer based system for schematic capture, it is possible to enter very complicated circuits into a computer relatively quickly. It is also possible to undertake the design of the board and perform circuit simulations while the basic design is underway. In addition to this, many circuit capture systems provide a means by which the circuit revisions can be managed and configuration controlled properly. Where a circuit is being repeatedly updated, and there may be the possibility of several people working on different areas, this is of great importance.

Elements entered into a schematic have a shape associated with them for the schematic. In this way a shape designed for a particular part will be pre-drawn and appear on the circuit every time that particular type of part appears on the circuit. When using an end-to-end design suite, the full shape may also include the PCB outline, pads and the like. In this way the part number for that part defines all the elements of the part for the design.

Practical aspects of schematic capture
One of the big problems with computer based schematic capture systems now is that the circuits are often very large and they can become unreadable and difficult to follow. There is a trend to print the circuits out on A4 or letter sized paper, and each sheet may only have a few components. 
Schematic error checking
It is very important to ensure that any schematic that has been captured is fully checked. While the simulation and other applications now available as part of an end-to-end design suite will trap and highlight many errors, some can still get through. Errors that creep through can be quite subtle. One that has been seen is where a particular node may be given slightly different names on different sheets. As the names are different they will not be connected by the computer. For example a node may be labelled "0v" on one sheet, but could appear as "gnd" on another. Accordingly it is very important to ensure that errors such as these do not creep through. Discipline in naming is essential.

Computer based schematic capture has greatly simplified the process of drawing circuit diagrams. Circuit schematics can be drawn as the circuit is designed, and managed in such a way that there is little room for error. While errors can occur, the level of errors has fallen dramatically with the introduction of circuit schematic capture software.

pcb/pcba design and assembly,welcome contact sally, Skype:raypcb15

Posted in PCB Technology By sally sally
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