Conventional Systems Technical Manual - Alcad

TV DOOR ENTRY INSTALLATIONSSTANDARD INSTALLATIONThere is no imageCheck that the channel to which the television has been tunedis the same as that selected in the modulator. Make sure that thecorrect standard has been selected for your country. Check themains voltage in the modulator. If the LED operating indicator ofthe modulator is not lit up, check whether there is a short circuitin the - , + connections of the video unit. Check that the voltagebetween the – and + terminals of the video unit is 15 Vdc±10%. Check the connection of the coaxial cable from thevideo unit to the modulator. If you cannot find the fault, theremay be something wrong with the modulator or with the videounit.TV DOOR ENTRY INSTALLATION IN A STANDARD DOOR ENTRY INSTALLA-TIONIf any type of problem related to the electronic door entrysystem is encountered, consult the data sheets of the correspondingaudio unit.There is no imageCheck that the channel to which the television has been tunedis the same as that selected in the modulator. Make sure that thecorrect standard has been selected for your country. Check themains voltage in the modulator. If the LED operating indicator ofthe modulator is not lit up, check whether there is a short circuitin the - , + connections of the video unit. Check that thevoltage between the – and + terminals of the video unit is 15Vdc ±10%. Check the connection of the coaxial cable from thevideo unit to the modulator. If you cannot find the fault, theremay be something wrong with the modulator or with the videounit.308