ACI Chip

Hi ,

after Checking more than a service manual for DCT4 models that have pop-port i discovered that the headset or any accessry should have a samll Chip in it called ACI-Chip ( Accessory control interface ) this is a 3 wire cuircit but i don,t know any more data about it cause in service manuals they did mention only that it,s ACI-chip .

Also there is a 56K resistance between pin 2 & 3 ( on the headset accesory it self not the phone ) .
I really didn,t know if this ACI-Chip & the 56K is defferenent for each accessory like camera or mono headset or no .

so i,m sure now that anyone who get a headset that recognized as Mono only that it,s not original ,cause NOKIA made this trick in it,s DCT4 phones .

Also notice that not all DCT4 models have this trick ( only newer ones )

Botros Ayad