Casio SF-4300B Spezifikationen PDF herunterladen (Seite 18)

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Replace PCB

< No key input >

Replace CPU (LSI1)

Is 13-Pin of CPU (LSI1) sending

the signal?

Replace DET1

Replace CPU (LSI1)

Does RAM make positive contact with

PCB?

Resolder RAM (LSI3)

Replace RAM (LSI3) or CPU (LSI1)

Does key make positive contact with PCB

Ass’y

Does CPU make positive contact with PCB?

Replace CPU (LSI1)

Resolder CPU (LSI1)

Is 1-Pin of S-80752AN (DET 1) 5[V]?

Is 11-Pin of CPU (LSI 1) sending the

signal?

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Casio SF-4300B Spezifikationen Seite 18