defect analysis report (tuner)

8/13/2019 Defect Analysis Report (Tuner)

http://slidepdf.com/reader/full/defect-analysis-report-tuner 1/13

Tettei “Be thorough”

SOEM

FM Left Channel Dead

TUNER 1 –

AMPR (A1846561Z)




SOEM

Chronology

16th.Oct 17th.Oct 18th.Oct 19th.Oct20Su

HR=01 3/700 setsFM Left Channel nooutput

Sorting using checker

3/700 setsFM Left Channel no

output

Sorting using meteto check IC 101 imped

4/700 setsFM Left Channel no

output

NormalKaga

sorting sorting




SOEM

Background

TUNER 1 – AMPR (A1846561Z)

Process at Kaga

Auto mount

Hand mount Dipping ICT

PWBbreaking

AssemblyUpper andLower case

CheckerInspection

For inspneed to FPC wireconnect

Discharge circuit

Checker

Checkefunctionand rig

Transport

DummyFPC




SOEM

Defect Analysis

OK pwb Reject pwb

FM L channel dead is havinbetween pin 2 (LCH) and G

IC 101 damag




SOEM

Step Analysis Analysis flow Status

Static Discharge Hand Mount static Assembly station staticOperator wrist strap

Value less than 50V > Value less than 50 V>OK

Checker Voltage Discharge Checker is equipped wcircuit where the voltimmediately after checompleted and readyinspected.> OK

Short circuit FPC checking. Due toissue, customer provi100 sets.( As each binpcs.> operator will inand end 2.)

>NG

1

2




SOEM

2 stations arerunning Tuner1 for12 hours. Output100 set/hour

Study on FPCused on 18th.Oct

Total 12 FPC foreach station at endof working day

FPC used Station 1

FPC used by Station 2

3b5p

2b

ea

NG

NG

NG

NG

NG

USED FPC




SOEM

Samples of OK FPC after 50insertion and pull

Pin 2= L channel

Pin 1,NG FPCCONTACT POINT

Terminalshort/alm

short con

Terminal bend

Terminalshort/almostshort condition




SOEM

Cause & Countermeasure

Root Cause (1): Due to FPC used at Function checker having condition of short or almost short condition.

This is due to FPC contact points having wear and tear condition after 50 times insert and

Countermeasure:Temporary1) Reduce FPC recycle from 50 times each to 25 times insert and pull for each end2) Perform resistance for left and right channel after function test

Permanent1) Redesign checker from using FPC to pin jig




SOEM

Why Leak Out?

Root Cause (1): Due to damage is done by the inspection station

Countermeasure:

To perform resistance check after inspection station




SOEM

Stock Treatment

■Raw Part◇ Sorting by …… (at Partner)

・ Result ： 3/2313 NG・ Marking ： R OK on Bin・ Date ： 20th.OCT 2013

◇ Sorting by …… (at SOEM) ・ Result ： 10/1919 NG

・ Marking ： R OK on Bin・ Date ： 19th.OCT 2013

■ Completed sets◇ Sorting by ………….

・ Result ： Not applicable

・ Date ：




SOEM

Preventive Action

Yokothenkai modification from using FPC to jig pin to o

models such as Tuner2 checkers.




SOEM

defect analysis report (tuner)

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