Panasonic Easa-Phone VA-208 Installation Manual page 134

1.7 Receiving circuit (speakerphone)
Sendvoice signal
P
vss
I
SP AMP
I
R50
I
_L
c55 7
R45 ICI
I I
IC4
I
I c4
I
R2"' , A6 _
r-v--i_
5+ R3
+av
The received voice signal is connected to the speakerphone via the following path.
COL + ICI + VRl + IC2 -+ CN5 (8), Main P.C.B. + IC6 + Speakerphone
In addition, the received voice signal is also inputted to the Voice SW via the following path.
COL + ICI + IC4 + ICI + Voice SW
If there is any send signal presente, pin (13) of IC2 (Voice SW) goes 0
, causing the receive signal to be cutoff
at IC2.
-8-