Panasonic KX-FLM551, Руководство по обслуживанию

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No. Name Function No. Name Function
1 STR Strobe input 19 NC Not used
2 CLOCK Clock input 20 EXTIN Ext amp output
3 DATA Data input 21 EXTOUT Ext amp input
4 VDD Logic power supply 22 LINEOUT Line amp output
5 VOXOUT VOX output 23 LINEIN Line amp input
6 VOXDET VOX detection adjustment 24 MODEMTXIN MODEM TX amp input
7 VOXIN VOX input 25 MODEMTXOUTMODEM TX amp output
8 VSS Logic ground 26 NC Not used
9 NC Not used 27 TONEIN Tone amp input
10 ROUT2 HS receiver amp output 2 28 NC Not used
11 ROUT1 HS receiver amp output 1 29 NC Not used
12 RIN HS receiver amp input 30 GND Analog ground
13 VCC Analog ground 31 MODEMRXOUTMODEM RX amp output
14 HSMICIN1 HS mic amp input 1 32 VLIN Volume amp input
15 HSMICIN2 HS mic amp input 2 33 VREF Reference voltage output
16 HSMICOUT HS mic amp output 34 VLOUT Volume amp output
17 NC Not used 35 SPOUT Speaker amp output
18 NC Not used 36 SPIN Speaker amp input
7.3.5.2. DESCRIPTION OF BLOCK DIAGRAM IN ANALOG SECTION
1. Function
The analog section works as an interface between the telephone
line.
The analog ASIC (IC201) on the digital board exchanges FAX TX
and RX signals between the CODEC (IC609) and the analog
section.
The control signals transmitted to the analog section are output
mainly from G/A IC610, and the analog status is stored as data in
G/A IC610.
2. Circuit Operation
[NCU]: Network Control Unit the NCU comprises of the following;
DC loop forming circuit to connect with the telephone line;
Switching circuit for other interconnected telephones; Bell
detection circuit; Extension phone line off-hook detection circuit;
Side tone circuit; Remote fax activation circuit.
Refer to
NCU SECTION () for the details.
7.3.5.3. BLOCK DIAGRAM
7.3.5.4. NCU SECTION
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