Casio SF-A7 Spécifications télécharger pdf (Page 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)

Resolder RAM (LSI3) or ROM (LSI4)

Replace RAM (LSI3) or ROM (LSI4) or CPU (LSI1)

Does key make positive contact with PCB

Ass’y

Resolder CPU (LSI1)

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

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

signal?

Does RAM or ROM (for LX-546AQ)

make positive contact with PCB?

Does CPU make positive contact with PCB?

Replace CPU (LSI1)

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Casio SF-A7 Spécifications Page 18