Wednesday, December 18, 2013

Fiducial Marks Of Printed Circuit Board

Fiducial marks are required for the automated placement of all SMT components. They are used as reference points by Auto placement machines to establish XY co-ordinates for accurate component placement.

1)There must be 2 fiducals placed diagonally opposite each other (on two diagonal corners of the PCB boards if possible) See Figure 5 below.

2) Fiducials should be created as a part in the component library, it will then appear in the pick and place data with a reference and XY co-ordinates.

3)Must be round and with a diameter of 1.5mm. A clear area of 2mm around each fiducial is required. See FIGURE 6 below.

Panelization requirement:

Optimum panel size (preferred): 150mm x 250mm including break off areas.

Maximum panel size: 250mm x 320mm including break off areas.

We can accommodate this size as a special case but quality problems due to this size may affect final yield.

PCB Number:
PCB must have a particular part number which must include the following:

1) Customers PCB number.
2) Version number. First version will show as V1 for example. (See below)

The above constraints should be met by the PCB design Engineer before Gerber, CAD and Pick and Place data is issued.

For more about the PCB production, please feel free to contact us by email .Thanks.

Monday, December 9, 2013

PCB Reverse Engineering

Wonderful PCB Technology Co., Ltd. is a professional PCB manufacturer and exporter located in Shenzhen, China. We provide PCB prototype, Rigid PCB, FPC, Rigid-flex PCB’s mass production. Also, we could support PCB reverse engineering from your PCB sample. More information, please check our website:

In the end of 20 century, the developing of technology was flourishing in Western countries and various advanced electronic products emerged. These electronic products were widely used. The developers mastered nearly all the technical programs and monopolized the field for such products. As a result, some enterprises raised the prices of their products maliciously so as to achieve greater profits. In order to break this monopoly, someone tried to copy such products with reversed research and analysis. Then the PCB reverse engineering emerged.

When the technology of PCB reverse engineering merged in the first stage, this technology is only confined to simple copying and cloning of the circuit board. However, nowadays, PCB reverse engineering also involved in the secondary development of products and new design/ new product development. When you reverse Engineer something, you should fully understand the design including impacts on timing, etc. There are designs out there with specifically designed center planes designed to impact data flow through the board. Some designs even have their own internal tuned coax etched into inner layers. For example, through the analyzing of product technical documents and comprehending of design ideas, structural features and technology, PCB reverse engineering can offer analysis of feasibility and competitive reference for the development of new products so as to help the R & D units to follow up the latest technology trends, adjust and improve the product design and produce the most competitive new products.

At present, the miniaturization of electronic products continues to drive printed circuit board manufacturing towards smaller and more densely packed boards with increased electronic capabilities. Advancements beyond the boards described here include three-dimensional molded plastic boards and the increased use of integrated circuit chips. These and other advancements will keep the manufacture of printed circuit boards a dynamic field for many years.

Although most of the PCB companies specializing in PCB reverse engineering focus on the pursuit of profit in the market, the few have begun to establish a position at a higher level and become the leaders in this field which suggest the high potential of PCB reverse engineering. It improves the technical capability of China enterprises and completely breaks the technical barriers. Wonderful PCB will try to put much more effort into the R&D of PCB reverse engineering and offer better PCB products.

Sunday, December 1, 2013

Some Fundamental information of Printed Circuit Board (PCB) Board

Nowadays, printed circuit board is widely used in electric & electronic field. This article introduces the fundamental information of PCB in details, including the definition, Gerber file, NC drill file, solder mask, silk screen, as well as the PCB finishing before ordering a PCB. Hope this tutorial can help our customers to improve their PCB knowledge.

The definition of PCB
For standard PCB, it is the combination of bare board and components on it. While for bare board PCB, it is called printed wiring board. We usually call it PWB.

What is Gerber File?
The Gerber format is a file format used by printed circuit board (PCB) industry software to describe the images of a printed circuit board (Signal, ground, power, solder mask, silk screen, and drilling layout plan, etc.). The Gerber format is the de-facto industry standard for printed circuit board image transfer. The Gerber format specification can be freely downloaded.

What is NC drill file?
THE NC DRILL FILE can be opened by Notepad. The NC drill file should have Tooling Size, and X Y info of the holes. An NC drill example is below: T define the hole size, X Y define the hole location. NC drill file can also define the NPTH holes; the best way is to generate a separate NC drill for NPTH holes (Non-plated holes).

Solder mask and silk screen:
The green or white oil on PCB is called solder mask, which is functioned as dielectric protective layer, can protects copper traces and also can prevent components to be soldered at incorrect place. Solder mask comes in different media depending upon the demands of the application. The lowest-cost solder mask is epoxy liquid that is silk screened through the pattern onto the PCB. Other types are the liquid image able solder mask (LPSM) inks and dry film image able solder mask (DFSM). LPSM can be silk screened or sprayed on the PCB, exposed to the pattern and developed to provide openings in the pattern for parts to be soldered to the copper pads. DFSM is vacuum laminated on the PCB then exposed and developed. All three processes go through a thermal cure of some type after the pattern is defined.
On the dielectric layer, a layer of silk screen will be printed. Some words will be printed to show the position of those components. It is also called legend.

PCB finishing
PCB Surface Finishes vary in price, availability, shelf life, reliability and assembly processing. While each finish has its own benefits, in most cases, the process, product or environment will dictate the surface finish that is best suited for the application. It is recommended that the end-user, designer or assembler work closely with their PCB supplier to select the best finish for the specific product design.

If need any more information on PCB, you could check and source from this website: Wonderful PCB Technology Co., Ltd is a professional PCB manufacturer for many years and could try best to help!

Thursday, November 28, 2013

Printed Circuit Board (PCB) Blanking

According to PCB material, hole and shape processing can adopt the method of mould cutting, to a simple PCB processing or request is not high PCB can be used in a cutting way.Suitable for low level and the requirements of the mass is not very high PCB PCB production and appearance requirements is not very high, the cost is low.


Production batch is big, the amount and type of hole and more complicated shape of single-sided paper substrate and non-metallic hole of epoxy glass cloth substrate double-sided, usually USES one or a few pay mold punching.


PCB production batch of the appearance of single panel and double panel, usually USES the mould .According to the size of the PCB, can be divided into the blanking die and whereabouts is expected to die.

The composite processing:

PCB hole and hole, hole and shape between the requirement of high precision, at the same time in order to shorten the manufacturing cycle, increase productivity, the composite mould machining hole and the appearance of the single panel at the same time.

With mold processing, PCB, the key is to mold design, processing, need professional knowledge, in addition to this, the mould installation and debugging is also very important, at present most of the PCB factory molds are made outside the factory processing.

Mould installation considerations:

1. According to the mold design and calculation of blanking force, the size of the mould, such as height choose punch (including type, tonnage).
2. Start the punch press, comprehensive review include the clutch, brake, slider, etc. Each part is normal, whether the operating mechanism and reliable, and should have no impact phenomena.
3. Die under the pad iron, generally is 2 pieces, must on the grinding machine grinding out at the same time, to ensure that the mold installation parallel and vertical.Shim placed leap put namely don't hamper blanking and near the center of the mould, as far as possible, at the same time.
4. To prepare a few sets of platen and T head clamp screw, so that the corresponding use and die.Linking piece without touching lower die straight front wall.The interface between should pad cloth, must tighten the screw.
5. Be very careful when mould installation on the screw, nut don't meet lower die mould (upper die down, closed).
6. Adjust the mould using hand as much as possible, instead of motor.
7. To improve the cutting performance of base material, paper board to be hot.The temperature at 70 ~ 70 ℃.
Die cutting of the PCB hole and shape, its quality defect has the following several:

Around the hole of the bump or copper foil case become warped or layers;Between holes and hole crack;Partial or hole itself is not a vertical hole position;Burr;The section coarse;Coining the PCB into the bottom of the pot shape warping;Waste jumping;Waste blocked.

The check analysis steps are as follows:

Check if the punch blanking force, rigid enough;Mold design is reasonable, whether rigid enough;The convex and concave die and machining precision of the guide pin, guide sleeve, if, if installation concentric, vertical.Fit clearance is uniform.Convex and concave of the gap is too small or too metropolitan produce quality defects, is a mold design, processing, and debugging, using one of the most important question.Don't allow the rounded edge convex and concave die, chamfering .Taper is not permitted in punch, especially when punching both positive cone and cone are not allowed.In production to pay attention to whether convex and concave die blade wear at any time.The discharging mouth is reasonable, small resistance.Pushing plate, a feed rod is reasonable, strength enough.Washed the plate thickness and the substrate binding force, the gel content, and the adhesion strength of the copper foil, to hot humidity and time is also cutting quality defects such as analysis of factors to consider.

Mr. Sam Duan

Sunday, November 24, 2013

Something About the Flexible Print Circuit Board(FPCB) You Should To Know

FPCB, all known Flexible Print circuit board or Flex Print circuit Board, it is attached to the flexible substrate on the dry film, exposed, developed, produced on the substrate after etching conduction lines. In terms of its relative rigid printed circuit boards can be curved flexible, smaller and lighter. In electronic products play a role in conducting and bridges make the product better performance, smaller.

Main material: polyimide + adhesive + copper are also non-adhesive backing, which only copper + substrate, its price is higher, less in the current application, unless special needs.

Copper CU (Copper Foil) in the material is divided into rolled copper RA (ROLLED ANNEAL Copper Foil) and electrolytic copper ED (ELECTRO DEPOSITED Copper Foil) two kinds, the characteristics of the mechanical properties of rolled copper is better, there are scratch off most requests are made rolled copper. Thickness is divided into 1/2oz (0.7mil), 1oz, 2oz, three are generally used 1oz.

Substrate in the material is divided into PI (Polyimide) Film and PET (Polyester) Pilm two kinds, PI's price is higher but its better flame resistance, PET lower prices but not heat. So if it needs most are made of welded PI Material thickness is divided into two kinds of 1mil 2mil.

Reinforcing material Stiffener soft board soldered parts or local area in order to increase reinforcement in order to install and another pressing up of hard material reinforced PI and PET film is divided into two kinds of materials as Epoxy FR4 material commonly known as urea resin plate reinforcement materials in general are feeling Caulking RESSURE SENSITIVE ADHESIVE fit with soft board, but you are using PI reinforcement film adhesive (Thermosetting) lamination.

Surface treatment

1. Rust treatment - on the surface of bare copper antioxidants
2. Tin-lead printing - the bare copper surface with solder paste printing another reflow furnace
3. Plating - Plating Tin / lead (Sn / Pb) nickel / gold (Ni / Au)
4. Chemical deposition - chemical solution deposition way to tin / lead nickel / gold surface treatment


Can be curved flexible, small footprint, light weight, stable transmission characteristics, sealing, insulation, good assembly process

Application areas:

Automation instrumentation, office equipment, communications equipment, automotive instrumentation, aerospace instrument, cameras and other PCB board .


(1)According to sub-layers: * Single Layer board * Double layer board * Multilayer board (two or more layers)
(2) By material: * Soft board * Rigid PCB board * Rigid-Flex PCB board

Tuesday, November 19, 2013

Some Knowledge About PCB Board Panelization

A key to saving money on PCB manufacturing during the design phase is to optimize the usable area available for each standard manufacturing panel.

Some manufacturers suggest that you put a number of different circuits on the same panel to improve material utilization and reduce manufacturing costs. At wonderful PCB Limited, we do this automatically as part of our pooling process, so there is no need for you to waste valuable design time. Of course you can suggest us your idea of panel size.

Penalization will do much help for the assembly process. If your layout uses SMD components we automatically panelized a solder-paste layer which you can download as a Gerber file for stencil manufacture. We can generate the paste files from the SMD pads on a "best-efforts" basis but it is not always clear to us which pads to include and which to leave out. So we recommend that you check these files before you use them. It is much safer to generate a paste file yourself and include it in the data you send us. We will then check it with the rest of the data and step and repeat it into the same assembly panel.

There are several ways to panelization of the PCB boards. Normally by V-cut, stamp hole and routing. No matter what kind of method you want, we can make it for you. And we can offer you the best solution. Manufactur ability rules: (1) Minimum dimension of the single PCB is 5 by 5 mm. (2) Maximum panel dimensions on the Verified and Verified Plus service is 250 x 350 mm.

Here are some of the PCB boards that in Panel for your reference.
First one is by V-cut and routing, the second is by stamp hole.

Monday, November 18, 2013

Introduction On Tin paste For PCB assembly

Tin paste perform a very important role during PCB assembly, and it is indispensable for assembly. This is why I have to introduce it, today I mainly want to show some pictures on Tin painting and ICT test.

Schematic plot on tin paintingscraper type )

Schematic plot on tin paintingextrusion type scraper )

Schematic plot for ICT test probe to component

In next chapter, I will introduce what is tin. For more information, pls enter

Monday, November 11, 2013

PCB Layer Definition

For the base skills for PCB board engineer is to know the PCB terms, especially for each layer, each hole, each unit, etc. In the EDA software terminology, there are a lot of terms is not have the same definition. The following could explain the different in literally meaning, which may help the unprofessional person to better understanding and learning the necessary terms.

Mechnical: generally refers to the type plate machining dimension layer

Keep out layer: definition cannot go line, perforation (via) or parts area. These limits can separate definitions.

Top overlay: can't literally know its meaning. To provide more information to further discussion.

Bottom overlay: can't literally know its meaning. Can provide more information for further discussion.

Exposed Top paste: top need copper on a part of the solder paste.

Bottom paste: need to show on the copper solder paste at the bottom of the part.

Top solder: shall mean the top resistance welding layer, to avoid in the process of manufacturing or in the future maintenance may not be short circuit

Bottom solder:Should refer to the underlying resistance welding layer.

Drill guide: it could be different aperture size, the corresponding symbol, and the number of a table.

Drill drawing: refers to the hole of the bitmap, different aperture will have a corresponding symbol.

Multilayer: there should be no separate this layer, can refer to a Multilayer, in view of the single panel and double panel.

Top paste: namely the surface patch when open stencil to use.

Bottom paste: that is the underlying patch when open stencil to use

Thursday, November 7, 2013

Anti-pollution Measures On PCB Fabrication

Nowadays, the pollution from PCB fabrication has drawn great public attention. The environmental pollution of PCB fabrication is mainly in the forms of waste water, exhaust gas, waste residue and so on. In most of the European countries, they have strict policy to control the pollution from PCB fabrication. While in China the pollution becomes more and more serious due too many PCB manufacturers and the control is not enough. In the future, the PCB fabrication will gradually move towards clean production sustainable development.

Firstly, the government must establish relevant laws and regulations to guide and control enterprise behavior, so as to save resources and improve resource utilization and reuse rate. Secondly, the PCB corporations that are not equipped with waste water treatment facilities or equipped with unqualified facilities waste water treatment should not continue the PCB fabrication any longer, completely changing the situation of observing the low at high cost and breaking the law at low cost .

Secondly, the PCB fabricators in China should establish good sense of environmental protection. During the PCB production, should follow ISO9001 and ISO14001 standard. The waste water should be well controlled. As long as the relevant government departments and PCB related industries cling together and formulate measures and systems in line with the national condition of PCB industry development in China, the pollution caused by PCB fabrication will go down substantially, even to meet the clean production requirement for sustainable development. As a manufacturer,

As a Leading PCB fabricator in China, Wonderful PCB shared our responsibility to protect the environment. Always bear in mind that production should follow the industry standards.

The Canada Carmaker's Visited Our Company Wonderful PCB Limited

Today is Friday; our Canada customer visited our factory. CANWAN is a big TV VA supplier at Canada , IRAN and Thailand. Wonderful PCB is the best PCB manufactory in China. Wonderful PCB with automated production and data networks -this is our forte. Specimen printed circuit board and mini-series in express service. Our overseas marketing office is located in Hong Kong mainly for overseas communications/contacts, engineering works handing orders and goods delivery/exports. Our company PCB products widely used in communication medical, industrial control household appliances, etc; the products are mainly exported to Europe and America. Southeast Asia and Asia.

At present, production capacity of Wonderful PCB reaches 15,000 M² / month with 400 operators. Wuhan new plant output over 30,000 M² / month estimate 600 operators.
Our environmental green boards produces single side, double side, multi-layers up to 14-layer on all series rigid board including high frequency board, BGA board and blind via board.

WDF managing new style of real capital employed Japanese quality team focus on quality supply chain. All our customers are long-term and continual development build begins from prototype to long term cooperation partnership.

Since develop from the past years, we are supplying green products measuring up to the standard of EU by Rosh and UL. WDF already certificated TS16949, ISO9001, ISO14001, SA8000 and Sony Green partner. Our PCB boards using on automotive, industrial, automation, aero plane to mature international business on U.S, Europe and Asia countries.

After years developing, WDF already being reliable green partner with stable annual growths of world famous brands like VW, Ford, Visteon, Sony, NEC and Delphi etc...

From continuous improvement strategies WDF established new advanced technology plant in Wuhan on 2013. WDF producing high quality, environmental friendly and stable lead time PCB boards definitely first choice of your ideal partner.
WDF Business Principle
We are production base aim to service our customer as a modern high technology company.
Intensive customer service is our base for entrepreneurship.
We must use creatively mind to work-smart.
We’re pursuing distinguished attitudes and will never stop to do better.

Wednesday, November 6, 2013

 2013 Asia World-Expo, Hong Kong--Wonderful PCB(HK)Limited

Oct.12-15th,2013 Asia World-Expo, Hong Kong

Wonderful PCB is a professional manufacturer company of printed circuit board. Been in line time more than 16 years experience in PCB & PCBA. Founded in 1996, Founded in Hong Kong in 2002 Wonderful PCB (HK) Limited by the end of 2007 by total assets of nearly 100 million Yuan. Nearly 20,000 square meters, the workshop area more than 700 employees, 40,000 sq/design production capacity.

Wonderful PCB with versatile production technologies! Rigid Printed Circuit Board with single sided, 2 Layers PCB, 4 Layers PCB, 6 Layers PCB, 8 Layers PCB, 16 Layers PCB 20 Layers PCB. Flexible Printed Circuit Board with single layer, 2 layers, and 4 layers.

Wonderful PCB Assembly based product manufacturing a wide range of assemblies, from single PCB assemblies to PCBA integrated into box-build enclosures. We support high and low-mix PCB for volumes that range from a few to a few thousand.

Wonderful PCB with automated production and data networks -this is our forte. Specimen printed circuit board and mini-series in express service. Our overseas marketing office is located in Hong Kong mainly for overseas communications/contacts, engineering works handing orders and goods delivery/exports. Our company products widely used in communication medical, industrial control household appliances, etc; the products are mainly exported to Europe and America. Southeast Asia and Asia.

Wonderful PCB in our job engineering and production planning! Films, data carriers or remote data transfer -we can adjust flexibly to all your needs. Rapid, rational processing of your orders. This reduces delivery times so that you can have your printed circuit boards at an earlier date.

We supply PCB Prototype & Mass production with good price and high quality.              
All the PCB is reaching IPC II Standard.                                        

In as much as Wonderful PCB has no control over the use to which others may put the material, each user of the material is not released of making his own tests to determine the material’s suitability for his own particular use. Statements concerning possible or suggested uses of the materials described herein are not be construed as constituting a license under any Wonderful PCB patent application covering such use or as recommendations for use of such materials in the infringement of any patent.

Lamination assist had Kraft press pad, silicon rubber press pad, Teflon release film, pressure revealing films. With the description of provide uniform cushioning and precise control over heat rise and long life (up to 150 uses) and faster lay-up. Put talcum powder before use.

Our pressure revealing film is a unique analytical tool. Provides a quick, easy and accurate in-house procedure for checking for “high” and “low” pressure zones due to press platen misalignments or the design configuration (pads, high density circuitry, ground planes, etc.) of the circuit board itself.

Welcome to our trading shows: 

Booth: 70206, CES  2014  Jan,8th-11th in Las Vegas, USA 

Tuesday, November 5, 2013

Introduction On PCB assembly Process

There are two process for manufacturer to do PCB assembly.
Below picture show control base plate(PCBA) exist everywhere in our house appliances.

Process of PCB assembly fabrication
(1) . Traditional DIP process
(2) . SMT process

Here first is the introduction of the process of DIP today.
1 . Traditional DIP process to PCB assembly means inserting the parts which with leg into the PTH hole of PCB.
2 . And then pass the PCB through tin soldering machine, to reach the purpose of soldering tin.                              

The structure of tin soldering machine

The structure of flux tank

The function of foamed pipe in flux tank
1. To air through the tiny holes on the foam tube body, causing numerous of air bubbles, with the number of air bubbles to cleave with flux, by metal accumulation, contact from the bottom of the base board and achieve the function of the flux coating, and then extra flux be strike off by air knife, and make flux distributed uniformly at the bottom of the base plate.

Method of flux coating
1. Bubble type flux coating
2. Wave type flux coating
3. Spray type flux coating

For more information, welcome

Sunday, November 3, 2013

Something About Visit Our Company Arrangement

Every customer to visit our company-Wonderful PCB Limited, hope we can focus on its immediate needs, can get warm reception, we as a salesman, want to in the process of reception customer, showing a good service skills, must be to do a good job of preparation in advance.

1. We should discuss details information from your customer.
You should tell you company address and your phone number. Because some customers not only to visit a company, convenient customer travel arrangements, the nearest airport to our company, our side of the weather.
2. Time, This is for the customer to the company's specific time.
3. The itinerary. Some customers from abroad by plane to Shenzhen, directly to visit our company, some customers to China later, first to visit other company, to visit our company, after some customers to visit our company, the next destination is where, these we all want to know to the customer, because the shuttle customers close contact with us.
4. The number. Tell visit your phone number and your company address.
5. Understand customers. Customers to the company visit must be interested in our PCB board products, we also have a certain understanding to the client, such as the customer is interested in which of our products, as well as the customer's company name, country, contact, specific visit time, number, scheduling, write a report to sales manager.
6. You should arrange hotel.
7. And cooperate with other departments. Generally when we handed the report to sales manager, sales manager will tell the production manager have client visit the date, the production manager will inform the workshop director, pay attention to all aspects of the work do a good job in workshop.
8. Understand customer preferences. Know about the customs of the country, customer's taboo, and diet.
9. The flight number, the plane arrived time and customers in China mobile phone. Understand customers arrive to the customer's flight number, or the customer requires us to pick up location
It is our great honor that you could visit and discuss details 9/9(Monday)

For our meeting we will discuss below:

A, Pick you up from your hotel to our office, have a comfortable meeting and we will introduce our company, know more about us. (9:00am start, assume 30mins)

B, Visit our factory, we introduce  PCB board processes, capability, equipment and so on. (2 hours)
C, Have a meeting to discuss details of your projects, prices, shipping details and so on. (1 hour)

D, Have lunch together if you are available (1hour)
E, Drive you back to hotel

Monday, October 28, 2013

The Basic Parts of a PCB Circuit Board

PCB, short for Printed Circuit Board, is playing increasing important role during our daily life. It makes the circuit miniaturize and visualize, and its essential role of fixing batch production and optimizing the layout of electrical equipment can never be ignored.

The circuit boards is generally composed of the following parts:

Pattern mainly refers to the line on the surface. The line is the connective tool between the components. And another copper surface will be designed as the ground and power layer.

It is used to keep the insulativity of the layers and commonly known as the base material.

Through hole/via
The hole can make two or more layers to conduct to each other. Usually, the larger holes are used as parts plug-in, while the NPTH is used to do surface-mount positioning, helping to fix screws when doing assembly.

Solder Mask
Not all the copper surface needs to solder on the parts. So for the area which soldering is not necessary, we will print a kind of material, usually known as epoxy resin, to prevent the copper surface from short circuit between the lines. According to different process, the solder mask can be divided into green oil, red oil and blue oil.

Legend/Silk Screen
This is not a necessary composition. The main function of it is to mark the name and location of the components, and to convenience the repair work after assembly.

Surface Finish/Treatment
Due to the copper surface is easy to oxidize during the general environment, causing poor solder ability. So there is usually a protection layer on the copper surface. And the methods of protection include Hot Air Solder Leveling (HASL), Immersion Gold (ENIG), Immersion Silver, Immersion Tin and OSP.

Circuit board is one of the most active industries in modern electronic components industry. The growth rate of the industry is generally higher than the electronic components industry by 3%. For the wide range of the application of printed circuit board, there must be wider market for it.

Wednesday, October 23, 2013

SMT Stencils of Printed Circuit Board

SMT stencil is an important tool during the PCB assembly. If you are producing a printed circuit board with SMD/SMT components, using a stencil can allow you to apply an even and accurately placed coat of solder paste to the pads. This is often quicker and easier than doing it manually, especially if you working with more than one copy of the same board. A consistent and accurate coat of paste will reduce the number of solder bridges and decrease board cleanup time.

The sole purpose of an SMT stencil is to transfer solder paste to a bare circuit board. A stainless steel foil is laser cut creating an opening for every surface mount device on the board. Once the stencil is properly aligned on top of the board, solder paste is applied over the openings. When the stainless steel foil is separated from the board, solder paste will remain, ready for placement of the SMD. This process, as opposed to hand soldering methods, ensures consistency and saves time.

Stainless steel foil thickness and aperture opening size control the volume of paste deposited on the board. Too much solder paste causes solder balling, bridging, and tomb-stoning. A lack of solder paste creates insufficient solder joints. All of which compromise the electrical functionality of the board.

At Wonderful PCB Limited, we use Laser Technology to manufacture SMT Solder paste stencil, high tolerance aperture openings with superior registration for its solder paste stencils. With its 4 mil beam diameter, our Laser is capable of cutting small aperture openings to meet your size requirements. When you need to make the stencil, please kindly send us the file for production and advise us the size and thickness of the stencil, with or without frame. Normally it takes 24-48 hours to make the stencil. Here is the stencil we produced for you reference.

For more detailed information, please contact Mr. Stephen Zeng at email: . Thanks a lot!

Wednesday, September 25, 2013

Common Problems And Treatment To PCB Board Drilling Process - B

     As we know, there’re many steps for PCB board fabrication. During the process, drilling is one of the most important process, many problems may happen during the process. Here I make introduction on the main problems and relative treatment.

1、drilling bit broken---introduced before.
2、via damage
Root cause includes:
Taking the drill bit after broken; Drilling without aluminum or clamp the blank; Parameter error; Drill bit elongate; valid length of drill bit can’t meet the requirements of drilling pile layer thickness; Hand drilling; Burred caused because of special raw material.
(1) according to the previous problem, ruling out cause of knife breaking, make the right treatment.
2) aluminum and back plane perform as protection to the via, must be used during production, distinguish the available and unavailable back plane, put them at the same direction, need to be taken double check before using.
(3) before drilling, must check if the drilling depth is in accordance with the drilling bit, check parameters of every drill bit are set correctly.
(4) check the location of the drill bit is correct when drilling machine catching the drill bit, then start the machine, boot drill tip generally can not exceed the presser foot when machine start.
(5) Check the valid length of the drill bit by visual before put onto machine, and measure the fold number of the available working laminates.
(6) If the accuracy, rotate speed of hand drilling can’t meet the the requirement, manual drilling should be forbidden.
(7) When setting the parameters to special raw material, proper selection of parameters should be taken according to the situation of quality, feed should not be too fast.

3、via location offset
Root cause includes:In the process of PCB board drilling, bit location moved; Improper selection to material of cover plate, softness or hardness discomfort; harmomegathus to material cause the offset of via; improper use to the adopted setting tool;improper setting on presser foot, it hit the pin and lead the remove of working laminates;resonance happen during the working to drill bit;Collect chuck not clean or damaged;slid caused by the touching of drill bit to cover plate during running; no pin; different base point; tape not sticked firmly; movement deviation happen to the Drilling machine's X, Y axis; problem with procedure.

Solution to problem 3 will be introduced in next document.

Common Problems And Treatment To PCB Board Drilling Process - A

  As we know, there’re many steps for PCB board fabrication. During the process, drilling is one of the most important process, many problems may happen during the process. Here I make introduction on the main problems and relative treatment.
1、drilling bit broken
Root cause includes:Excessive spindle deflection; wrong operation taken by operator during drilling; Not appropriate choosing to drilling bit;insufficient rotate speed to drill bit;Laminated layer too much;Debris between plate and plate or under plate;the depth of the drilling spindle too deep cause poor chip removal; Amounts of drill tip grinding and super life use; Cover scratches crease, plate bending uneven; Fixed base board tape too wide or flat aluminum, plank is too small; Feeding speed is too fast compression; Improper operation during hole filling; Under the cover plate aluminium serious plugging ash; Welding the center of the drill tip pointed and drill tip handle deviation in the center.
  (1) Notice the part to repair the spindle, ore change for better spindle
  (2) A、Check whether there is stress beriberi pipeline jam
  B、Adjust the pressure of the foot according to the situation of the drill bit, check the pressure data of the foot when pressing, the normal is 7.5 kg;
  C、Check the spindle speed variation and whether there is copper wire inside the clamp mouth uniformity which may impact speed
  D、Check the spindle speed variation and the stability of the main shaft.
  E、Carefully adjust the pressure between the feet and bit, drill tip pointed not show presser foot, allowing only the tops of drill within the presser foot 3.0 mm
  F、Test the parallel degree of mesa drilling and stability
(3) check the geometry shape of drill bit, wear and use chip back slot length appropriate drilling bit.
(4) select the appropriate amount of feed, reduce feed rate.
(5) reduce to the appropriate number of laminated.  
(6) when the upper plate clean surfaces and under the cover of sundry, keep the surface clean.
(7) adjustment notification machine spindle drilling depth, maintain good drilling depth. (normal to control the depth of the hole in the 0.6 mm shall prevail.)
(8) number control grinding (wi) or in accordance with the parameters in the table Settings.
(9) choose suitable surface hardness, flat cover and plate.
(10) carefully check the status of tape fixed and width, replace the cover plate aluminium sheet, check the size.
(11) decrease the feed rate.
(12) operation should pay attention to the correct hole location.
(13) A, check the height of presser foot and presser foot exhaust slot is normal;

In next comment. Will introduce other problem which may usually happen during drilling.

Thursday, September 5, 2013

Wonderful PCB(HK) Limited. NON-Disclosure Agreement

This Mutual Non-Disclosure Agreement (the “Agreement”) is made and entered into as of May 14th.,  2012 between Wonderful PCB(HK) Ltd.,  a PCB corporation located at  32 A, Building No. 1, XianDaiHuaTing, ChuangYe Road, NanShan District, ShenZhen, China. and -----xxxxxxx having its principal place of business at ********.
1.  Purpose.  The parties wish to explore a business opportunity of mutual interest and in connection with this opportunity, each party may disclose to the other certain confidential technical and business information which the disclosing party desires the receiving party to treat as confidential.

2.  “Confidential Information” means any information disclosed by either party to the other party, either directly or indirectly, in writing, orally or by inspection including, without limitation, documents; prototypes; software and software documentation; ideas and concepts; samples; plant and equipment; technical specifications; financial, marketing and business plans; operating procedures, organization charts and lists of personnel; customer lists; product plans; and all similar information.  Confidential Information shall not, however, include any information which (i) was publicly known and made generally available in the public domain prior to the time of disclosure by the disclosing party; (ii) becomes publicly known and made generally available after disclosure by the disclosing party to the receiving party through no action or inaction of the receiving party; (iii) is already in the possession of the receiving party at the time of disclosure by the disclosing party as shown by the receiving party's files and records immediately prior to the time of disclosure; (iv)is independently developed by the receiving party without use of or reference to the disclosing party's Confidential Information, as shown by documents and other competent evidence in the receiving party's possession; or (v) is required by law to be disclosed by the receiving party, provided that the receiving party gives the disclosing party prompt written notice of such requirement prior to such disclosure and assistance in obtaining an order protecting the information from public disclosure.

3.  Non-use and Non-disclosure.  Each party agrees not to use any Confidential Information of the other party for any purpose except to evaluate and engage in discussions concerning a potential business relationship between the parties.  Each party agrees not to disclose any Confidential Information of the other party to third parties or to such party's employees, except to those employees of the receiving party who are required to have the information in order to evaluate or engage in discussions concerning the contemplated business relationship.  Neither party shall reverse engineer, disassemble or decompile any prototypes, software or other tangible objects which embody the other party's Confidential Information and which are provided to the party hereunder.

4.  Maintenance of Confidentiality.  Each party agrees that it shall take reasonable measures to protect the secrecy of and avoid disclosure and unauthorized use of the Confidential Information of the other party.  Without limiting the foregoing, each party shall take at least those measures that it takes to protect its own most highly confidential information and shall ensure that its employees who have access to Confidential Information of the other party have signed a non-use and non-disclosure agreement in content similar to the provisions hereof, prior to any disclosure of Confidential Information to such employees.  Neither party shall make any copies of the Confidential Information of the other party unless the same are previously approved in writing by the other party.  Each party shall reproduce the other party's proprietary rights notices on any such approved copies, in the same manner in which such notices were set forth in or on the original.

5.  No Obligation.  Nothing herein shall obligate either party to proceed with any transaction between them, and each party reserves the right, in its sole discretion, to terminate the discussions contemplated by this Agreement concerning the business opportunity.


7.  Return of Materials.  All documents and other tangible objects containing or representing Confidential Information which have been disclosed by either party to the other party, and all copies thereof which are in the possession of the other party, shall be and remain the property of the disclosing party and shall be promptly returned to the disclosing party upon the disclosing party's written request.

8.  No License.  Nothing in this Agreement is intended to grant any rights to either party under any patent, mask work right or copyright of the other party, nor shall this Agreement grant any party any rights in or to the Confidential Information of the other party except as expressly set forth herein.

9.  Term.  The obligations of each receiving party hereunder shall survive until such time as all Confidential Information of the other party disclosed hereunder becomes publicly known and made generally available through no action or inaction of the receiving party, but in no event shall the term for any Confidential Information disclosed under this Agreement exceed five (5) years from the date of initial disclosure.

10.  Remedies.  Each party agrees that any violation or threatened violation of this Agreement may cause irreparable injury to the other party, entitling the other party to seek injunctive relief in addition to all legal remedies. The parties agree that in the event of a dispute arising under or related in any way to this Agreement, the non-prevailing party shall pay all costs and expenses,  including reasonable  attorneys'  fees,  that may  arise or  accrue  from  enforcing  this Agreement, obtaining an interpretation of any provision of this Agreement, or in pursuing any remedy provided by applicable law whether such remedy is pursued or interpretation is sought by mediation, arbitration, the filing of a lawsuit, an appeal, and/or otherwise.

11.  Miscellaneous.  This Agreement shall bind and inure to the benefit of the parties hereto and their successors and assigns.  This document contains the entire agreement between the parties with respect to the subject matter hereof, and neither party shall have any obligation, express or implied by law, with respect to trade secret or proprietary information of the other party except as set forth herein.  Any failure to enforce any provision of this Agreement shall not constitute a waiver thereof or of any other provision.  This Agreement may not be amended, nor any obligation waived, except by a writing signed by both parties hereto.
WONDERFUL PCB(HK) Ltd.                  xxxxxxx
Signature: __________________                  Signature: ________________   
Date: __________________              Date: _________________
Company Chop:  _________________         Company Chop:  _________________

Tuesday, September 3, 2013

Wonderful PCB Prototype Tips

Constructing a PCB prototype is really a job very greatest left to pros, as it specifications to become carried out in accordance to exact specs. Any errors in the course of the prototyping stage could possess a cascading result on your PCB boards and things through the production run. Taking your designs to a specialist PCB manufacturing firm which can accurately create your prototype can get rid of errors that will expense worthwhile time and cash. Following are the issues which you ought to assume from a respected firm that builds prototype circuit boards:

PCB style and manufacturing businesses present solutions for versatile as nicely as rigid printed prototype circuit boards. The strategy ought to ideally commence using a expert overview of one's files for style and style for manufacturer capability. This signifies that your merchandise will be created a whole lot far more manufacture-capable by addressing a variety of feasibility and performance aspects. Your files will also be reviewed for excellent good quality supplies and swift turnaround. Rushing a file assessment will not be the really finest organization practice. It really is most effective to pick a firm that assures a thorough critique even if it takes longer. Checking for challenges at an early stage assures that no time is wasted through the vital phases.

Wonderful PCB is often a skilled PCB prototype manufacturer in Shenzhen China. It can provide thorough service including checking your Gerber file, give suitable suggests according to your style, analyze your design, manufacture, packing and excellent after-sale service! Wonderful PCB would be the provider that you simply will need. It might assist with trouble shooting, redesigning, or making variations from the very same circuit. These value-additional solutions are what distinguish mediocre makers from expert firms.

We right here provide some suggestions when make PCB prototype!

1). Verify the hole and pad diameters of plated-through VIAS. When you want a 12-mil-diameter plated-through hole, as an example, a printed circuit board vendor will probably drill a 17-mil hole and the internal plating will decrease the hole to 12 mils. But drills usually do not normally hit dead center. To ensure you still have enough pad area in the leading and bottom in the hole, make the pad diameter 10 mils bigger than the drill size. If tight spacing prevents beefing up the pad diameter, try to use a smaller hole. In all instances, you'd like a large enough annular ring of copper on both sides on the board to make sure excellent conductivity by way of the Via.4 layer BGA PTH holes unplugged immersion gold 3u" and black solder mask

2). Generating diameters of openings within a solder mask is advisable. 5 Mils are larger than their linked pads. The bigger opening helps make sure the solder mask does not encroach around the electrical pad.

3). Anytime possible, set your circuit board layout software to "flash" pads instead of draw them. A flashed pad exists as a single geometric entity although a drawn pad comprises several lines utilized to fill an location. The latter markedly increases the size of Gerber files and may bring about production complications.

4). Give PCB vendors comprehensive "contact" details. Supply detail contact details if you need a speedy response.

5). Generally include things like an accurate board outline on a minimum of 1 layer; also clearly show any slots or cutouts on this layer. Vendors can use this facts to create routing and scoring programs, which saves money and time.

6). Circuit boards designers should endeavor to keep traces and pads a minimum of 20 mils from their PCB edges. Board-dimension tolerances of ±5 mils are common, and also you don't want traces reduce or damaged during production. PCB fast prototyping maker will look in the PCB traces and pads and if attainable try to move them slightly away from edges.But with some layouts, that is not possible.

Thursday, August 22, 2013

Stencil for Quick Turn PCB Board Prototype

Wonderful PCB®, the leading printed circuit boards (PCB) prototype manufacturer, has enhanced their services by offering SMT stencils when placing an order within their quick turn and high quality product lines. Stencils join a growing suite of PCB solutions that includes Bundled Assembly, PCB Design Software and Free DFM. With the new stencils addition, Wonderful PCB is continuing to distinguish themselves as a comprehensive PCB manufacturer and provider from other providers in the marketplace.

Stencils are used for even deposition of solder paste onto a bare circuit board. Using the stencil, you deposit solder paste (a mix of microscopic solder balls and flux) onto all of your pads with one swipe of a squeegee. When paste the solder, need to spread ample amount of solder paste across the entire upper length of the stencil. The angle of your squeegee is important when swiping solder paste over your laser cut stencil. Next, place all of your components on your board. When placing your components, it is usually helpful to give a very slight tap onto the freshly solder pasted pads to help hold them in place before heating in toaster oven. You do not even have to get it perfect, as the surface tension of the molten solder will pull your components into alignment (if you designed your footprints correctly!). Next, heat the board until the solder paste melts (reflows) using a heat gun, a toaster, or an oven. Since you never directly contact a component with a hot soldering iron tip, there is less chance of damage to the component.

With the new availability of stencils, Wonderful PCB will experience numerous benefits. All stencils feature the following:
Permanent, non-removable, and non-fading fiducials
Exclusive performance enhancing stencil design modifications, tailored specifically for each customer
Time Savings (eliminates scheduling and documentation downtime
100% laser cut, ensuring the finest quality finish
All fixed frame stencils are double bonded to withstand extreme wear
Plates available with safety features to protect against sharp plate edges

By using the new addition of the stencils product line, Wonderful PCB has greater confidence in the high quality SMT PCBA production! More and more customers are satisfied with Wonderful PCB SMT production line. Of course, your order for PCBA board is always welcomed in Wonderful PCB.

Here we provide some FAQ for your learning:
Q: Why would I need a PCB stencil?
A: The PCB stencil thickness is determined by the smallest component land pattern. Stencils replace hand soldering of surface mount devices, and the inconsistencies created by hand soldering.

Q: What are home base apertures and why would I need them?
A: Home base apertures are used to control solder balling and tomb-stoning of chip components.

Q: What are Trapezoidal Apertures and why would I need them?
A: Trapezoidal Apertures are created by distorting the beam on the laser, creating a draft in the aperture wall. Trapezoidal Apertures are effective if you plan on a long dwell time between printing of solder paste and placement of components. The taper in the aperture wall causes the paste to sit on top of itself, rather than sliding out the sides.