Casio SF-5500B Manual do Utilizador descarregar pdf (Página 17)

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No/Erratic display

Is input Pin 2 of REG1 6 V?

Adjust the contact and clean

the battery springs.

Is output Pin 3 of REG1 5.3 V?

Are the voltages of V1, V2, V3, and V4

strong enough?

V1: 1.3 V

V2: 2.5 V

V3: 2.7 V

V4: 3.9 V

Is the soldering of LSI1 poor?

Replace LSI1.

Resolder.

High current consumption

START

Are the capacitors C8, C9, C11, C12,

and C13 OK?

Is there any short circuit on the PCB

assembly ?

START

Note:

Contrast: Maximum

Replace C1, C2, C3, or C4.

Repair shorts.

Resolder or replace LSIs and ICs.

Replace the capacitor(s).

Replace REG1.

Replace the batteries.

Are the power of batteries strong enough?

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Casio SF-5500B Manual do Utilizador Página 17