Voltage Regulator IC PCB Assembly Service Lead Free Hasl One Stop OEM Prototype

Voltage Regulator IC PCB Assembly Service Lead Free Hasl One-Stop OEM Prototype

Test After PCB Assembly

After the board has been populated it may be tested in a variety of ways:

• While the power is off, visual inspection, automated optical inspection. JEDEC guidelines for PCB component placement, soldering, and inspection are commonly used to maintain quality control in this stage of PCB manufacturing.
• While the power is off, analog signature analysis, power-off testing.
• While the power is on, in-circuit test, where physical measurements (for example, voltage) can be done.
• While the power is on, functional test, just checking if the PCB does what it had been designed to do.

To facilitate these tests, PCBs may be designed with extra pads to make temporary connections. Sometimes these pads must be isolated with resistors. The in-circuit test may also exercise boundary scan test features of some components. In-circuit test systems may also be used to program nonvolatile memory components on the board.

In boundary scan testing, test circuits integrated into various ICs on the board form temporary connections between the PCB traces to test that the ICs are mounted correctly. Boundary scan testing requires that all the ICs to be tested use a standard test configuration procedure, the most common one being the Joint Test Action Group (JTAG) standard. The JTAG test architecture provides a means to test interconnects between integrated circuits on a board without using physical test probes, by using circuitry in the ICs to employ the IC pins themselves as test probes. JTAG tool vendors provide various types of stimuli and sophisticated algorithms, not only to detect the failing nets, but also to isolate the faults to specific nets, devices, and pins in PCB assembly service.

When boards fail the test, technicians may desolder and replace failed components, a task known as rework.

Usage of PCB Assembly service

  Printed circuit boards have been used as an alternative to their typical use for electronic and biomedical engineering thanks to the versatility of their layers, especially the copper layer. PCB layers have been used to fabricate sensors, such as capacitive pressure sensors and accelerometers, actuators such as microvalves and microheaters, as well as platforms of sensors and actuators for Lab-on-a-chip (LoC), for example to perform polymerase chain reaction (PCR), and fuel cells, to name a few.

Specification 

Company Introduction

CESGATE is a team with more than 10 years experience in the field. We owns abundant experiences for serving overseas customers from industrial automatic control, communication, medical, Auto and consumer electronics,etc. We test our product strictly to guarantee the quality to our customers. We accumulate high reputation during our cooperation.You will achieve following value-added services when you cooperate with us:

One-stop PCB/PCBA Service
Optimizing your PCB design during production
Satisfied quality with competitive prices
Instant response in both quotation and delivery
Increase your business with our powerful support

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