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3-4. Clean around IC

1) Rosin is remaining, to the location that

soldered IC.

2) Ethyl alcohol is used, to remove rosin.

Note1 : Be sure that the IC have no bent pins.

A bent pin will make contact for a while, but

after vibration it no longer does.

Note2 : Cleanup does not use tissue paper.

3) Rosin is removed carefully by using

alcohol and cotton applicator.

4) After that around IC becomes clean like

above photograph.

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Trouble shooting ECR V1.01