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7.10. ITS (Integrated Telephone System) AND MONITOR SECTION
7.10.1. GENERAL
During the monitor operation, the speaker output passes through the power amplifier (IC102) [Analog board].
The DTMF signal is output from the modem (IC505: digital board). The alarm tone, the key tone, bell tone, and beep are output
from gate array IC501 (digital board). During a pulse dial operation, the monitor tone is output from gate array IC501.
7.10.2. TELEPHONE MONITOR
1. Function
This is the function when you are not holding the handset
and can hear the caller's voice from the line.
2. Signal path
Refer to CHECK SHEET (P.104).
7.10.3. HANDSET CIRCUIT
1. Function
This circuit controls the conversation over the handset, i.e.
the transmitted and received voices to and from the
handset.
2. Signal path (Transmission signal)
Refer to CHECK SHEET (P.104).
3. Signal path (Reception signal)
Refer to CHECK SHEET (P.104).
7.11. ATAS(Automatic Telephone Answering System) SECTION
1. Function
The ATAS main operation is performed by the special IC505 (MODEM). IC522 (FLASH MEMORY)s control signals are input
from ASIC IC501.
a. Greeting/Message Recording
b. ICM Recording
c. Greeting/Message/ICM play to speaker
d. Greeting/Message/ICM play to Tel Line
e. Vox Detection
2. Signal Path
Refer to CHECK SHEET (P.104).
7.10.4. SPEAKER PHONE CIRCUIT
1. Function
The circuit controls the automatic switching of the
transmitted and received signals, to and from the telephone
line, when the unit is used in the hands-free mode.
2. Circuit Operation
The speakerphone can only provide duplex.
3. Signal path
Refer to CHECK SHEET (P.104).
7.10.5. MONITOR CIRCUIT
1. Function
This circuit monitors various tones, such as 1 DTMF tone,2
Alarm/Beep/Key tone/Bell.
2. Signal path
a. DTMF MONITOR
(Speaker Operation)
Refer to CHECK SHEET (P.104).
(Handset Operation)
Refer to CHECK SHEET (P.104).
b. ALARM/BEEP/KEY TONE/BELL
Refer to CHECK SHEET (P.104).
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KX-FP362CX
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Troubleshooting
