Sigma prides itself on its commitment to resolve problem in a prompt and satisfying manner. In order to promote and achieve great customer service and customer satisfaction, Sigma endeavours to resolve problem at the first point of contact.

After-Sale Service
Our after-sale service assists customers for any kind of technical questions and helps customers select and obtain the right devices, tools and software to build their next applications with professional technical support from manufacturers. Available information includes but is not limited to:

 • Datasheet/Application Notes
 • RoHS,REACH,MSDS documents
 • Product Change Notification
 • End of Life Information and Cross reference
 • Reliability and Quality Infomation
 • Product Numbering Scheme
 • Packaging Information

Third-party technical support covers all levels of componenttests,which areavailable as value-added service accommodating our customers’ requirements.

 • Level-I Authenticity Inspection & Verification (AIV)
 • Level-II  Direct Current Characteristics Test (DCCT)
 • Level–III KEY FUNCTIONAL TEST (KFT)
 • Level -IV Full Functions and Characteristics Test (FFCT)
 • Level-V Alternating Current Characteristics Test (ACCT)
 • Level-VI Special Environment Analysis & Test (SEAT)
 • Level -EXI RoHS Criteria (Lead-free) Test and Analysis (LFTA)
 • Level -EXII Solderability Test and Analysis (SDTA)

Complaints Management System
Our complaints management system establishes methods to identify and control customer complaints, servicedeficienciesanddefective product;so that if, by chance, a problem exists or a mistake is made, it will be handled effectively and efficiently with the following flowchart. 

At the end of each quarter, the recorded complaint dataarecollected and complied. The data arethen used to assist Sigmatoidentify in what areaschange or improvement is required(e.g.products, policies or procedures).

RMA Policy
Sigma offers up to 90 days warranty for every shipment. In most cases, Sigma will accept merchandise returns subject to the terms outlined in this section, and will recall, replace the product or refund customers’money at their option.

To facilitate processing of returning merchandise:
 • Please contact our sales for a RMA issue with a formal failure report,pictures and other verifabale documents.
 • Sigma verifies the invoice and picture information to trace the supply channel and have all the information matched.
 • Sigma commits to feedback within 24 hours to customer for a RMA issue and give a solution with 48 hours.
 • Sigma issues a RMA number for the return or replacement with Sigma's freight account.
 • By returning a product to Sigma, customers must confirm and warrant that the returned product was purchased from Sigma
 • All returns are subject to the terms and conditions of the applicable manufacturer's warranty and the applicable manufacturer's return policies for the product.
 • Returns must be made within Sigma’s warranty period, be accompanied by the original invoice number and a brief explanation of the reason for the return, and be in original packaging.
 • Products returned, solely due to customer error, may be charged for  a 20% restocking fee .
 • For the special products which are confirmed as Non-Cancelable/Non-Returnable on the purchase order,no returns are accepted
 • All returns must be authorized by Sigma and no returns may be made without Sigma’s official acceptance in writing.