Panasonic KX-FL612CX Service Manual page 164

KX-FL612CX / KX-FL612CX-S
7.5.1.2. 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.
7.5.1.3. 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.
7.5.1.4. TAM INTERFACE SECTION
1. Function
When TAM is connected to this unit, the unit receives documents for FAX calls or the external TAM records a voice message
automatically.
2. Circuit Operation
The TAM INTERFACE circuit consists of the transformer (T202), amplifier (IC202), analog ASIC (IC207), MODEM (IC600) on
the digital board to detect the other party CNG signal, and RLY200 to separate EXT.TAM.
a. CNG signal detection circuit
The CNG signal from the other party's FAX is detected in MODEM IC600 (digital board).
(Signal path)
Refer to CHECK SHEET(P.128).
b. Remote receiving
This is the parallel-connected DTMF signal for the TEL or EXT.TEL mode between T and R. When the other party is a FAX,
the unit switches to FAX receiving.
(Signal Path)
Refer to CHECK SHEET(P.128).
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