Its (Integrated Telephone System) And Monitor Section; Atas (Automatic Telephone Answering System) Section - Panasonic KX-FT907BX-B Service Manual

8.9.

ITS (INTEGRATED TELEPHONE SYSTEM) AND MONITOR SECTION

8.9.1. GENERAL
The general ITS operation is performed by the modem IC5. The alarm tone, the key tone, the calling tone and the beep are output
from the ASIC IC1 (digital board).
8.9.2. 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.93)
8.9.3. 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
Refer to CHECK SHEET (P.93)
8.9.4. MONITOR CIRCUIT FOR EACH SIGNALS
1. Function
This circuit monitors various tones, such as 1 DTMF tone, 2 Alarm/Beep/Key tone/Bell 3 Dummy ring back tone.
2. Signal path
Refer to CHECK SHEET (P.93)

8.10. ATAS (AUTOMATIC TELEPHONE ANSWERING SYSTEM) SECTION

1. Function
The ATAS main operation is performed by the special IC5 (MODEM). IC6 (FLASH MEMORY)´s control signals are input from
ASIC IC1.
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.93)
8.10.1. REMOTE RECEIVING
1. Function
This is the parallel connection DTMF signal for the TEL mode between a and b. When the other party is a FAX, the unit changes
to FAX receiving.
2. Signal Path
Refer to CHECK SHEET (P.93)
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KX-FT907BX-B / KX-FT907BX-W