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PCB rework,circuit PCB board rework,electronic product rework,PCB rework redesign,shenzhen cn china

Express: PCB Fabrication // Assembly // Design
Professional: PCB Manufacturing // Assembly // product development // Engineering
Low Cost: PCB Manufacturing // Assembly // Design // Components Procurement

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Customers just need to write ONE purchase order to Cn China-PCB-sourcing for a complete engineering task that includes the following:
PCB Circuit Diagram Design/Layout
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Our design services - PCB Layout, Electronic Projects Engineering, High Quality, Low costs & Fast Service, backed up by great support.

Design Capability:
The electronic design is called a schematic or circuit diagram. It is constructed in CAD format.At China-PCB-sourcing we use Protel, OrCAD, PADs,CAM350,Genisis... We have an experienced design house/ bureau be family with both military & commercial projects, can do many product Research and Development work(R&D).We have over 80 active accounts with major component manufacturers & distributors (most with Internet access & next day delivery). If the part you require is out there, we'll find it for you.

Express electronic Manufacturing Services
We provide electronic manufacturing services:High quality Low cost bare PCB and PCBA;
(EMS) to customers requiring PCB fabrication and assembly,
sub-assembly, full turnkey box buildor precision mechanical assembly.
PCB Fabrication : 24 hours Express bare PCB manufacturing
PCB Assembly (PCBA), PTH PCB Assembly, SMT PCB Assembly

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PCB rework,circuit PCB board rework,electronic product rework,PCB rework redesign,shenzhen cn china
circuit product PCb rework layout, electronic circuit schematic design, shenzhen, cn China,professional Low Cost,High quality.

PCB Assembly Rework

First-pass Pb-free assembly is sufficiently challenging but circuit board repair is even more challenging. The issues of time, cost, quality, and repeatability associated with PCB repair are now exacerbated with Pb-free. Extra time and cost are involved to re-train operators to perform Pb-free assembly, rework, and inspection. Also, the cost of Pb-free materials like solder bars, wires, and wire core solder is more expensive compared to traditional eutectic soldering materials. Since the operating window for Pb-free assembly and rework is considerably smaller and tighter in terms of processing temperatures (approx. 30 – 35º C), more precision and accuracy are required to develop the profile and procedure for Pb-free rework. This means more research time is needed to investigate and set up proper circuit board rework procedures.ADJUSTABLE BOARD CRADLES
A Wide Variety of PCB Holders / Utilitarian, Versatile PCB Holding Fixtures / Models ABC-1 & 2



"The ABC Circuit Board Cradle holds the work piece over the AirBath. It is movable to allow for more freedom during any necessary alignment processes. Large PCB's can be handled without a problem." - NASA Report, Jan. 9, 2004


All Zephyrtronics Equipment is Engineered and Manufactured in the United States of America.



Order Securely
On-Line







Inclined 2-Post Position is Ideal for PCB Assy & Prototyping. "PCB Slide Along" Permits Inserting Thru-Hole Devices Before Soldering
4-Post Table-Top Position for PCB
Preheating or Prototyping or Rework Where Soldering & DeSoldering is Done

More Details:

The ABC Series of PCB Holders! This just may be the most popular printed circuit board fixture on earth! The Adjustable Board Cradle or the ABC Series of board holders from Zephyrtronics was engineered as an easy to use, multi-purpose circuit board assembly fixture.

The ABC Cradle is your multi-tasker at the bench. Its unique design can securely hold multiple PCB's within the adjustable tracks. Boards are inserted and removed from either the top side or by slide entry into the dove-tailed tracks from the sides. Noteworthy is the industrial, rugged design of the ABC's! Whether prototyping, small production runs, reworking PCB's, or needing to position the board above your preheater, the ABC is your bench helper.
UNIVERSAL FEATURES OF THE ABC SERIES OF HOLDERS

Holds Up to 8 Posts (Each Cradle Ships With Four Posts):
- 2 Post Inclined for PCB Slide Along Tasks
- 4 Post Table Top for Preheating, SMD Soldering & DeSoldering
- 8 Post for Flipping During Thru-Hole DeSoldering or Inspection
Durable All-Metal Construction
Non-Skid Feet
Open Frame / Flat Table Top (PCB's Can Rest Right on the Top)
Dovetailed, Adjustable Tracks for PCB Assembling
Knobs Secure the Tracks & PCB in Position
Ideal for Preheating PCB’s
ESD Safe
Quickly Breaks Down for Storage or Travel. Fits In Many Briefcases.
Options:
- Additional Tracks (See Our Quatro™ Models Below)
- Various Sized Tables (Standard, Large and Tiny. See Below)



Six Options to Choose From! The ABC Series is available in three different sizes: The ABC-1 with the tracks capable of holding PCB's up to 10"x18" within the adjustable tracks; The ABC-2 capable of holding PCB's up to 20x18; and the ABC-T is capable of holding PCB’s up to 8.5” x 13”. Further, all three of these styles of cradles come in are available in either 3-Rail or 4-Rail designs (see tables below). And all six styles can be made into either the two-post inclined position or the ever-popular four-post table-top position!Circuit Board Repair and Rework Guide

Printed Board Type: N/A
Skill Level: N/A
Conformance Level: N/A
Revision: N/A
Revision Date: N/A



The information within these guides should be helpful to anyone who works with bare circuit boards and circuit board assemblies. These guides are packed with illustrations and videos and follow popular IPC standards. These guides will help you through the maze of challenges you face when working on modern, high density circuit boards. If your company complies with ISO-9000 or any demanding quality standard, you can refer to these guides as your on-line reference.

Guides in sections 1 through 6 detail the proper step-by-step techniques, tools and materials, and cautions needed to reliably repair and modify bare and assembled circuit boards.


Section 3 covers procedures for base board repair.

Guides in sections 7 and 8 detail the proper step-by-step techniques, tools and materials, and cautions needed to reliably rework assembled circuit boards.

Each procedure includes a "Conformance Level" indicated as high, medium or low. This Conformance Level indicates how closely the repaired or reworked product will be to the original specifications. The Conformance Level listed for each procedure should be used as a guide only.

Each procedure also includes a "Skill Level" providing a gauge for the requisite experience and skill needed by the operator to obtain a reliable outcome. Skill Levels are listed as intermediate, advanced, or expert. The Skill Level recommended should be used as a guide only.


Section 4 covers procedures for conductor repair.

Hundreds of detailed illustrations, as shown on the right, are included throughout this guidebook. Visit the Foreword for more information on this guidebook and how it can be used at your company to reduce waste.

Visit these sections more specific information.

1.0 Foreword
This section provides substantial background information about this guide and how it can be used at you company.
PCB rework station Document Type and Number:United States Patent 5031820
Abstract:A rework station for soldering/desoldering of integrated circuits on a printed circuit board (PCB) wherein a gantry mounted on a base positions hot gas delivery and vacuum application apparatus over a PCB carried between carrier arms mounted on a horizontal arm slidably mounted in a pinion block for movement in the X direction with respect to the base. The pinion block is slidably mounted in the base for movement in the Y direction. A combination of sprockets and idlers transmits X and Y drives for driving the horizontal arm and pinion block from control dials mounted at the front edge of the base. Ads by Google
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2.0 Basic Procedures
This section covers handling, cleaning, coatings, legend, and use of epoxies.


Section 6 covers jumper wire procedures.

3.0 Base Board Procedures
This section covers repair of delamination, warp, key slots, non plated holes, surface defects, and various defects to base board material.


It is important to note that the table top design permits much larger military and satellite boards to sit directly on top of the frame for either assembly, preheating, soldering, or de-soldering tasks. In fact, the table top frame is proven far superior to the cantilevered-type fixtures which can stress the substrate causing fissures and weakening solder joints. The ABC Cradles support the PCB preventing stresses to the substrates, the vias, the laminations, and to the solder joints as well.


Every ABC Cradle Ships With 4 Posts Along With 4 Brass Adjustable Nuts & 4 Non-Skid Feet.



The Entire Top is Smooth & Flat! Perhaps most noteworthy, the ABC Series has a FLAT TABLE TOP FRAME unlike other four-legged fixtures that have knobs and brackets protruding up above their frames preventing a PCB from laying flush or flat on the top. The "FLAT TOP" design of the ABC Series is often cited as the single favorite attribute



Good PCB assembly practice calls for Pb-free training kits to train people and develop the profiles. Maintaining a high quality rework is more challenging because the PCB and the adjacent component to the targeted rework component are subjected to multiple cycles of higher temperatures. To maintain the integrity of the PCB laminate the maximum preheat temperature is set at approximately 10º C below Tg (glass transition temp.) of the PCB material. Higher thermal preheat temperature minimizes the potential thermal distortion and shock to the PCB during the reflow process. Thick circuit boards such as 0.093 mils thick or more require more heat, have greater Delta T across assemblies, and may require slower re-flow oven line speed. As overall circuit board size increases, the process window tends to shrink.

 
 

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PCB rework,circuit PCB board rework,electronic product rework,PCB rework redesign,shenzhen cn china