CASIO SF4400
Instrukcja Serwisowa

1
N Is 1-Pin of S-80752AN (DET 1) 5[V]? Y Is 11-Pin of CPU (LSI 1) sending the signal? Y Is 13-Pin of CPU (LSI1) sending the signal? Y Does RAM make positive contact with PCB? Y Replace RAM (LSI2 or LSI3) or CPU (LSI1) N Resolder RAM (LSI2 or LSI3) N Replace CPU (LSI1) N Replace CPU (LSI1) Replace DET1

< No key input >

Does key make positive contact with PCB Ass�y

N Replace PCB

Y Does CPU make positive contact with PCB? N Resolder CPU (LSI1)

Y Replace CPU (LSI1)

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