i've got an old LA60 door chime i'm trying to fix for an 'old' friend.
when power is applied the speaker pops, but from what i've been told it should make the default chime sound when powered up.
the key pad seems to only partially function as i can sometimes get 3's, 5's, or 7's to appear on it's two digit display. but nothing more.
on removal of power the speaker again pops. i am getting 5v to the keypad ic and nutone ic.
i have tried some audio from my phone to after the driving tansistors before the amp and it will play sound, so i know the amp pat is good.
assuming the nutone ic plays the default chime on powerup, i can only think that it is bad since the keypad also does not seem to work properly.
attached is the manual with schematic.
thanks in advance. if i dont get it working i plan on using an arduino with an mp3 shield to make a suitable replacement.
when power is applied the speaker pops, but from what i've been told it should make the default chime sound when powered up.
the key pad seems to only partially function as i can sometimes get 3's, 5's, or 7's to appear on it's two digit display. but nothing more.
on removal of power the speaker again pops. i am getting 5v to the keypad ic and nutone ic.
i have tried some audio from my phone to after the driving tansistors before the amp and it will play sound, so i know the amp pat is good.
assuming the nutone ic plays the default chime on powerup, i can only think that it is bad since the keypad also does not seem to work properly.
attached is the manual with schematic.
thanks in advance. if i dont get it working i plan on using an arduino with an mp3 shield to make a suitable replacement.
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