Presentation on theme: "EC Jet On board electrolytic capacitor polarity and missing parts inspection. ECPD Technology ( E lectrolytic C apacitor P olarity D iscriminating T echnology.)"— Presentation transcript:
EC Jet On board electrolytic capacitor polarity and missing parts inspection. ECPD Technology ( E lectrolytic C apacitor P olarity D iscriminating T echnology.)
The challenges on production line. Traditional ICT test systems. 1.Very low Electrolytic Capacitor polarity discriminating rate(30%-50%). 2.Unable to find out the capacitor miss part during the test. Missing Parts. Wrong Orientation.
Challenge on production line. Inspecting by human eyes not only waste of time and money but also un- reliable as well.
Traditional ICT Electrolytic Capacitor discriminate method. 2 Terminals Leakage Current detect Method. 3Terminals impedance detect method. HP TestJet Induce method. HP TestJet Induce method. + M ~ Z-Z- Z+Z+ + I+I+ + I-I- +
1.Too long testing time to test. 2.DUT tested under rating (damage) voltage. 3.High false rate. Limitation of 2 terminals leakage current detect method. I+I+ + I-I- +
1.Unable to verify the connectivity of the 3rd PIN. 2.Too much variations of the characteristics of the capacitor. 3.Coverage rate about 30~50% level. Limitation of 3 terminals impedance test method. Z-Z- Z+Z+ +
2.Good for on board circuit capacitor small than 10uF. Limitation of HP TestJet method. + M ~ 1.Open 1 of the EC terminal reach the same induced voltage in HP pad. So, it is very difficulty to discriminate the polarity of EC. 3.Unable to work for P4 mother board test. Because all the capacitor (including the capacitor which parallel in circuit design)much higher than 10uF level.
Characteristics of EC Test Jet. For EC Polarity Discriminating Rate = 100%. Explosion free EC Polarity Discriminating rate = 100%. Ultra High Speed, on board 50 Capacitors Test time < 2 sec. Parallel EC missing part detective ability.
EC Jet know how. ~ Signal sourceResponse Signal BLACK BOX Un-know network analysis model. ~ M T(time) V source T(time) V Response
FFTDFT Principle of EC Jet technology. DSP Pattern Match ~ M F(freq.) V V DUT STD Digital Signal Processing. T(time) V Source T(time) V Response
Principle of EC Jet capacitor miss detection. DSP Pattern Match ~ M F(freq.) V STD DUT F(freq.) V
Why parallel capacitors missing parts can not be found? Tolerance of electrolytic capacitance = -20% ~ +50% Vcc C1C1 C2C2 C3C3 C4C4 CnCn ?? ?
Test limitations of EC Jet. Temperature. Parallel Capacitor Explosion free capacitor DUT with normal temperature between 0° ~ 55°C, failure rate = 0, 100% able to test. DUT with temp > 80°C, failure rate : about 20% DUT with temp >60°C, failure rate : less than 5% Huge value of capacitor affect the testing time (15-20ms /PCS), due to sampling time is a little longer. Explosion free capacitor needs long testing time. Due to the polarity characteristics of explosion free capacitor is not so clear as normal capacitor. Testing time as long as 200 ms/ pcs.
Concerned the contribution rate of the reverse polarity and missing part of electrolytic capacitor. Motherboard acceptable quality level (AQL) : Failure rates : less than 2000 ~ 4000 PPM( super high quality level ) or Less than 4000 ~ 10,000 PPM ( so-so quality level ). Actual value of EC failure rate experiment on the production line of leader mother board maker of Ax company. Actual EC polarity failure rate : About 1,000 ~3,000PPM / board level. Actual EC missing part rate : About 1,000PPM / board. Total failure rate : 2,000~4,000 PPM.
Human eyes inspection is overdo ! Actual EC polarity reverse rate : 1,000 ~ 3,000ppm / board. Actual EC missing parts rate : 1,000ppm / board. Failure rate : 2,000 ~ 4,000 PPM/board. In this case : 40 EC capacitors are on board. Failure rate = 50 ~100PPM/component. Actual value experiments on Ax company’s production line.
Benefits of EC Jet. Use old ICT: JET300 TR518. Use EC Test Jet. Instead of human Eyes Inspection. Getting higher quality. Use EC Jet Save 2 ~ 3 Operators. Less Effort. Higher Quality.
Less efforts Higher quality Profits Competitiveness Conclusion of EC Jet. EC JET