Table of Contents
Advertisement
| ~
KX-T4330
mM MONITOR CIRCUIT AND SPEAKER MUTE CIRCUIT
Circult Operation:
The monitor signal flow is as follows:
Circuit Diagram
ICA
(9)
4)
+
-
(5)
6)
coq Rt
' nibs
C112
6)
H-
SPEAKER
513
R105 C107
IC9 Pi @®
t
S HEAD BEEP
Fig. 39
@ VOX CIRCUIT
Function:
sound at all.
Alter detection, the CPU issues an instruction that makes VOX operation possible.
This means that when a telephone call has ended, the phone is reset and is ready to receive the next call.
Circuit Operation:
A signal output from terminal Pin 16 of IC4 passed through C84, R94 and inputted to Pin 13 of 1C4—sPin 12 of IC4—sPin 47 of IC9.
When sound is present, the output at Pin 12 of IC4 becomes a low level, while no-sound its output becomes a high level.
Circult Dlagram
IC4
Q22
R94
C84
R99
Di6é
C34
D10
Ico@
vOx
Fig. 40
Advertisement
Table of Contents
