Panasonic Easa-Phone VA-208 Installation Manual page 133
Key telephone system
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Also See for Easa-Phone VA-208:
- Operating instruction (45 pages) ,
- Operating instructions manual (45 pages)
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1.6. Transmitting
circuit (speakerphone)
R20
AnA
-tw
Q6
RI9
When the SPKR
button
is pressed, pin (20) of ICI
on the main P.C.B.
(PB3942)
becomes
(@ causing
Q5 and 06
to be turned
ON and the power
to be supplied
to the MIC.
The send
voice signal is connected
to the COL via the following
path.
MIC
-+IC6-+
IC2-+VR2' lCl
+Tl
-+COL
In addition,
the send voice signal is also input
to the Voice
SW via the following
path.
MIC+
IC6+
IC2-+VR2-+
ICI +Voice
SW
If there
is any receive signal, since the voltage
level at pin (6) of IC2 is caused by the Voice
SW to drop,
the send
signal level also becomes
low.
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