Dears Sir Can you send me a schematic for the fax ¨easy¨ HFC 21 ?. It not have audio voice (I estimate the hand set has been inverted).It occur in others opportunities and I can hear a buzzing in the same and avoid damage, but in this oportunity the loudspeaker is mute, but fine in impedance. I work as electrotechnic and desire repair my very good fax machine. Best regards and thank you. Ermelino L. Rodriguez Argentina.