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SMTnet Express, April 14, 2016, Subscribers: 24,224, Companies: 14,786, Users: 40,027

Technical Library

Causes and Costs of No Fault Found Events

Louis Y. Ungar; A.T.E. Solutions, Inc.

A system level test, usually built-in test (BIT), determines that one or more subsystems are faulty. These subsystems sent to the depot or factory repair facility, called units under test (UUTs) often pass that test, an event we call No-Fault-Found (NFF). With more-and more electronics monitored by BIT, it is more likely that an intermittent glitch will trigger a call for a maintenance action resulting in NFF. NFFs are often confused with false alarm (FA), cannot duplicate (CNDs)or retest OK (RTOK) events. NFFs at the depot are caused by FAs, CNDs, RTOKs as well as a number of other complications. Attempting to repair NFF scan waste precious resources, compromise confidence in the product, create customer dissatisfaction, and the repair quality remains a mystery. (...)

This paper will shed some light on this trade-off. Finally, we will explore approaches for dealing with the NFF issue in a cost effective manner.

read article »

Forum search results for related keywords: level test, intermittent failure, false alarm.

SMT / PCB Products



Hand Assembly

Virtual Industries



Pick & Place

Count On Tools


BTU International

Solder Paste Stencils

BEST, Inc.




GPD Global

Pick & Place








SMT / PCB Equipment Auctions

HGST Penang Malaysia

Complete Facility Closure - Private Treaty Sale of well-maintained and complete (6) SMT Lines...

Closing May 6 | GoIndustry DoveBid

Surplus to the Ongoing Operations of TTM Technologies

Large Assortment of SMT, Lab & Test Equipment, Factory Support and more...

April 28 | Perfection Machinery Sales

Electronic Equipment Mart

DEK Horizon APIX

Screen Printing Equipment

ECM Equipment Sales

PPM 5000 Large Board

Adhesive Dispensing Equipment


Fuji XP 341E

Pick and Place

X-Line Asset Management

Ersa N-Wave 330

Wave Solder Equipment

AdoptSMT Europe GmbH

DEK Infinity

Screen Printing Equipment

Capital Equipment Exchange

Mydata Agilis Inserts and Magazines

Pick and Place Equipment/Feeders

IBE SMT Equipment

Events Calendar

SMT Hybrid Packaging 2016

Trade Show/Exhibition, Conference | April 26 - 28 | Mesago Messe Frankfurt GmbH

Nepcon China 2016

Trade Show/Exhibition, Conference | April 26 - 28 | Reed Exhibitions

Surface Cleanliness Assessment - Free PCB Cleaning Webinar

Online Webinar | April 21 | ZESTRON Corporation

CAMI Research, a WHCC Top Product Winner, to Host Seminar & Training Sessions at WPT Expo, Milwaukee

Seminar/Course | May 10 - 12 | CAMI Research Inc.

Career Center

Sales/Client Relations Associate

Freemont, CA, USA

Macrotron Systems

Sales Coordinator

Albany, NY, USA

YINCAE Advanced Materials, LLC.

SMT Operator

Saten Island, NY

Vitas Manufacturing

Industry Associations Events


SMTA - Surface Mount Technology Association is a non-profit international association of companies and individuals (totalling 4,000) involved in all aspects of advanced electronics assembly, surface mount and related technologies.

Membership Info | SMTA Certification | Bookstore

Next Event: SMTA Webinar: PCB Surface Finishing Overview: How Process Parameters Effect Functional Performance - April 20


IPC - Association Connecting Electronics Industries is a US-based trade association dedicated to the competitive excellence and financial success of its nearly 2,600 member companies which represent all facets of the electronic interconnection industry, including design, printed wiring board manufacturing and electronics assembly.

Membership Info | Training & Certification Programs | Standards & Publications - Online Store

Next Event: IMPACT Washington, D.C. 2016 - April 18 - 20

Technical Editor - Davef (submit your technical articles)

Newsletter Editor - Anna Girouard, 98 Elm Street, Portland, Maine 04101 USA, Tel.207-780-0887.

Used PCB Assembly Equipment - CE Exchange

Used and New SMT parts & consumables, ESD products

CyberOptics - Revolutionary AOI Technology, Unbelievable Speed

Unused Equipment? - let BajaBid turn your EXCESS ASSETS into cash!

KIC - Making Ovens Smarter.

Late Model SMT equipment ONLINE AUCTIONS

Kyzen Free Cleaning Audit

Quality Pre-Owned SMT Eequipment - Robo-Tek

FINETECH - The complete solutions for all types of ADVANCED REWORK applications.

High-Speed 3D AOI - Highly Customizable Viscom S3088 serie.

Hioki 1240 Flying Probe Tester - ultra-high speed measuring, fine pitch inspection. - Rework Tools

DS Series large board dispensers - GPD Global

PCB real-time X-ray inspection - JewelBox Ultra Compact Microfocus X-ray Technology

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