8.7. Its (Integrated Telephone System) And Monitor - Panasonic KX-FLB758RU Service Manual

KX-FLB758RU
8.6.5. REMOTE FAX ACTIVATION CIRCUIT
1. Function
Another telephone connected to same line activates the unit to the FAX mode by using a DTMF signal.
2. Signal Path
Refer to CHECK SHEET (P.137).
8.6.6. TAM INTERFACE CIRCUIT
This circuit is to switch between FAX receiving and the external TAM's message recording automatically. This circuit consists of a
transformer, multiplexer, amplifier.
For details, please refer TAM INTERFACE SECTION (P.230).
8.7. ITS (Integrated telephone System) and MONITOR SECTION
8.7.1. GENERAL
The general ITS operation is performed by the special IC201 which has a handset circuit. The alarm tone, the key tone, and
the beep are output from the ASIC IC604 (digital board).
8.7.1.1. 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. Circuit Operation
(Telephone Monitor Signal Path)
Signals received from the telephone line are output through at the speaker via the following path.
3. Signal Path
Refer to CHECK SHEET.
8.7.1.2. 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.
3. Signal path (Reception signal)
Refer to CHECK SHEET.
8.7.1.3. 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.
(Handset Operation)
Refer to CHECK SHEET.
b. ALARM/BEEP/KEY TONE/BELL
Refer to CHECK SHEET.
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