Casio SF-A7 Dokumentacja Pobierz pdf (Strona 19)

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< No/Erratic display >

Is input 2-Pin of S-81253 (REG1) 6[V]?

Is output 3-Pin of S-81253 (REG1)

5.3[V]?

Y

Y

N

N

Check batteries

Replace REG1

N

N

Does CPU (LSI1) make positive con-

tact with PCB?

*CONTRAST: MAX

Resolder

Y

N

Resolder/Replace CPU, IC

Y

< High current consumption >

Y

Check PCB

Is there any short circuit?

Y

N

Are the several capacitors OK?

Replace capacitors

*Are voltage of several capacitors enough?

V1: 1.3 [V]

V2: 2.5 [V]

V3: 2.7 [V]

V4: 3.9 [V]

Replace CPU (LSI1)

Check solder part of C6, C7, C8,

C9, C10 or replace.

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