Panasonic KX-FT21RS Bedienungsanleitung PDF herunterladen (Seite 130)

6.8. NCU SECTION

6.8.1. GENERAL

This section is the interface between the telephone line and external telephone. It is composed of an EXT. TEL Line relay (RLY1),

bell detection circuit, EXT TEL selection circuit, pulse dialing circuit, line amplifier, sidetone circuits and multiplexer.

6.8.2. Line Relay (RLY1)

1. Circuit Operation

Normally, this relay switches to the external telephone side (Break) and switches to the open side (make) when the unit starts

facsimile communication.

[IC1 (99) High Level → CN9 (8)] → CN102 (8) → Q2 ON → RLY1 (make)

6.8.3. BELL DETECTION CIRCUIT

1. Circuit Operation

The signal waveform for each section is indicated below. The signal (low level section) input to pin 56 of ASIC IC1 on the digital

board is read.

TEL LINE → PC5 (1, 2 - 4) → PC102(6) → [CN9(6) → R19 → IC1(56)]

6.8.4. PULSE DIALIG

[IC1 (28) High Level → CN10 (4)] → CN202 (4) → Q3 ON → PC1 ON (make)

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Panasonic KX-FT21RS Bedienungsanleitung Seite 130