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313211 313221 313231 313241 313251 PART . T5029B 313261 10/06-01 - AP Instruction sheet Sfera audio door entry kits Fitting entrance panels and name plates Fitting handsets 160 - 165 General installation requirements NB. At position B we recommend that a suitable enclosure with...
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Testing the speech circuit Testing the speech circuit - The entrance panel contains two potentiometers for adjusting the power of the microphone ( ) and loudspeaker ( ) - In case of a whistle (feedback), first reduce the power of the microphone until an acceptable level is reached Should whistle persist adjust the loudspeaker volume Fault finding No speech or call signal:...
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