Casio AP-21 Manuel d'utilisateur télécharger pdf (Page 15)

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4. Certain keys do not function

5. A certain key does not function

Clean the contact.

Does the key function?

Does the key function?

Yes

No

No

Replace the key contact rubber.

Replace keyboard PCBs.

End

Yes

Does the key function?

Replace the main PCB.

Yes

No

Replace the main PCB.

Do the keys function?

Yes

No

Replace keyboard PCBs.

End

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