CIRCUIT OPERATIONS
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KX-FT21LA
7-3. HANDSET CIRCUIT
(1) Transmission signal
Refer to " CHECK SHEET " on page 72.
(2) Reception Signal
Refer to " CHECK SHEET " on page 72.
7-4. MONITOR CIRCUIT
(1) DTMF Monitor
(Speaker Operation)
Refer to " CHECK SHEET " on page 72.
(Handset Operation)
Refer to " CHECK SHEET " on page 72.
(2) Alarm/Beep/Key tone/Bell
Refer to " CHECK SHEET " on page 72.
(3) Dummy Ring Back Tone
Same with the modem signal transmission.
7. ITS (Integrated telephone System) and MONITOR SECTION
7-1. GENERAL
During the monitor operation, the speaker output passes through the power amplifier (IC1) [Analog board].
The DTMF signal is output from the modem (IC1: digital board). The alarm tone, the key tone, bell tone, and beep are
output from gate array IC1 (digital board). During a pulse dial operation, the monitor tone is output from gate array IC1.
7-2. MONITOR CIRCUIT
(1) Function
This is the function when you are not holding the handset and can hear the caller's voice from the line.
(2) Circuit Operation
(Monitor Signal Path)
Signals received from the telephone line are output through at the speaker via the following path.
Refer to " CHECK SHEET " on page 72.
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