Panasonic KX-MB2110RUW / KX-MB2130RUW / KX-MB2170RUW / KX-MB2117RUB / KX-MB2137RUB / KX-MB2177RUB Service Manual ▷ View online
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KX-MB2110RUW/ KX-MB2130RUW/ KX-MB2170RUW/ KX-MB2117RUB/ KX-MB2137RUB/ KX-MB2177RUB
6.3.3.
Modem Circuit Operation ( Fax supported models only )
The modem (Included IC300) has all the hardware satisfying the CCITT standards mentioned previously.
ALL processing is controlled by the SOC (IC300) according to CCITT procedures.
This modem (Included IC300) has an automatic application equalizer. With training signal 1 or 2 at the time of G3 reception, it can
automatically establish the optimum equalizer.
ALL processing is controlled by the SOC (IC300) according to CCITT procedures.
This modem (Included IC300) has an automatic application equalizer. With training signal 1 or 2 at the time of G3 reception, it can
automatically establish the optimum equalizer.
Facsimile Transmission/DTMF Line Send
The digital image data sent on ATXD line from modem (Included IC300).
AFE IC (IC200) and Analog DAA
AFE IC (IC200) and Analog DAA
*1
circuit to the telephone line.
Facsimile Reception
The analog image data which is received from the telephone line passes through Analog DAA circuit and enters AFE IC(IC200).
The signals are changed to digital data in AFE IC and IC300. In this case, the image signals from the telephone line are trans-
mitted serially. Here, the internal equalizer circuit reduces the image signals to a long-distance receiving level. This is designed
to correct the characteristics of the frequency band centered around 3 kHz and maintain a constant receiving sensitivity.
The signals are changed to digital data in AFE IC and IC300. In this case, the image signals from the telephone line are trans-
mitted serially. Here, the internal equalizer circuit reduces the image signals to a long-distance receiving level. This is designed
to correct the characteristics of the frequency band centered around 3 kHz and maintain a constant receiving sensitivity.
Busy/Dial Tone Detection
The path is the same as Facsimile Reception.
Call Tone Transmission
This is the call signal which is generated the SOC (IC300) and sent to the speaker.
*
1
DAA : Direct Access Arrangement
6.3.4.
TEL Line Section ( Fax supported models only )
Composed of ITS circuit and NCU circuit.
6.3.4.1.
Description of Block Diagram in Analog Section
Function
The analog section works as an interface between the telephone line.
DAA control ITS circuit and NCU circuit.
DAA control signals are output from SOC (IC300).
DAA control ITS circuit and NCU circuit.
DAA control signals are output from SOC (IC300).
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; Remote fax activation circuit.
Refer to NCU Section ( Fax supported models only ) (P.35) for the details.
Switching circuit for other interconnected telephones; Bell detection circuit; Remote fax activation circuit.
Refer to NCU Section ( Fax supported models only ) (P.35) for the details.
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KX-MB2110RUW/ KX-MB2130RUW/ KX-MB2170RUW/ KX-MB2117RUB/ KX-MB2137RUB/ KX-MB2177RUB
6.3.4.2.
Block Diagram
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KX-MB2110RUW/ KX-MB2130RUW/ KX-MB2170RUW/ KX-MB2117RUB/ KX-MB2137RUB/ KX-MB2177RUB
6.4.
NCU Section
( Fax supported models only )
NCU: (Network Control Unit)
Requires for connecting computers to public communication networks and send a dial signal to call the other party.
Requires for connecting computers to public communication networks and send a dial signal to call the other party.
6.4.1.
General
NCU is the with the telephone line. It is composed of EXT. TEL. Line Relay (RLY100), Bell Detection Circuit, Pulse Dial Circuit, Line
Amplifier and Side Tone Circuit, Calling Line Identification Circuit (FSK_Bellcore), Calling Line Identification Circuit (DTMF), Calling
Line Identification Circuit (FSK_ETSI), Remote FAX Activation Circuit and TAM Interface Circuit. The following is a brief explanation
of each circuit.
Amplifier and Side Tone Circuit, Calling Line Identification Circuit (FSK_Bellcore), Calling Line Identification Circuit (DTMF), Calling
Line Identification Circuit (FSK_ETSI), Remote FAX Activation Circuit and TAM Interface Circuit. The following is a brief explanation
of each circuit.
6.4.2.
EXT. TEL. Line Relay (RLY100)
1. Circuit Operation
Normally, this relay switches to the external telephone side and switches to the open side while OFF-HOOK.
IC300 (P23) High Level
IC300 (P23) High Level
Q201 ONRLY100 (ON)
6.4.3.
Bell Detection Circuit
1. Circuit Operation
The signal waveform for each point is indicated below. The signal (low level section) input to IC300 (W25).
TEL LINE
TEL LINE
PC103 (1, 2 4) IC300 (W25)
6.4.4.
Pulse Dial Circuit
The pulse dial is generated by operating the transistor Q201 while OFF-HOOK (RLY100 ON) condition.
Make state:
IC300 (P23) High Level
Make state:
IC300 (P23) High Level
Q201 ON RLY100 ON
Break state:
IC300(P23) LOW Level
IC300(P23) LOW Level
Q201 OFF PC100 OFF
6.4.5.
Line Amplifier and Side Tone Circuit
1. Circuit Operation
The reception signal output from the line transformer T100 is input to pin (2) of IC201 via C256, R224 and then the signal is
amplified at pin (1) of IC201 and sent to the reception system at through the LPF.
amplified at pin (1) of IC201 and sent to the reception system at through the LPF.
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KX-MB2110RUW/ KX-MB2130RUW/ KX-MB2170RUW/ KX-MB2117RUB/ KX-MB2137RUB/ KX-MB2177RUB
6.4.6.
Calling Line Identification Circuit (FSK_Bellcore)
1. Function
This unit is compatible with the Caller ID service offered by your local telephone company. To use this feature, you must sub-
scribe to a Caller ID service. The data for the caller ID from the telephone exchange is sent during the interval between the
first and second rings of the bell signal. The data from the telephone exchange is a modem signal which is modulated in an
FSK (Frequency Shift Keying) format. Data “0” is a 1200 Hz sine wave, and data 1 a 2200 Hz sine wave.
There are two type of the message format which can be received: i.e.the single data message format and multiple data mes-
sage format.
When there is multiple data in the unit, the name or telephone number are displayed.
scribe to a Caller ID service. The data for the caller ID from the telephone exchange is sent during the interval between the
first and second rings of the bell signal. The data from the telephone exchange is a modem signal which is modulated in an
FSK (Frequency Shift Keying) format. Data “0” is a 1200 Hz sine wave, and data 1 a 2200 Hz sine wave.
There are two type of the message format which can be received: i.e.the single data message format and multiple data mes-
sage format.
When there is multiple data in the unit, the name or telephone number are displayed.
2. Circuit Operation
Refer to Check Sheet for Signal Route of CNG/DTMF/Caller ID detection detection (P.170).
6.4.7.
Calling Line Identification Circuit (DTMF)
1. Function
This unit is compatible with the Caller ID service offered by your local telephone company. To use this feature, you must sub-
scribe to a Caller ID service. This data for the caller ID from the telephone exchange is sent before the first rings of the bell
signal. The data from the telephone exchange is a DTMF signal.
scribe to a Caller ID service. This data for the caller ID from the telephone exchange is sent before the first rings of the bell
signal. The data from the telephone exchange is a DTMF signal.
2. Circuit Operation
Refer to Check Sheet for Signal Route of CNG/DTMF/Caller ID detection detection (P.170).
6.4.8.
Calling Line Identification Circuit (FSK_ETSI)
1. Function
This unit is compatible with the Caller ID service offered by your local telephone company. To use this feature, you must sub-
scribe to a Caller ID service. The data for the caller ID from the telephone exchange is sent during the interval between the
first and second rings of the bell signal. The data from the telephone exchange is a modem signal which is modulated in an
FSK (Frequency Shift Keying) format. Data “0” is a 1300 Hz sine wave, and data 1 a 2100 Hz sine wave.
There are two type of the message format which can be received:i.e.the single data message format and multiple data mes-
sage format.
The multiple data format allows to transmit the name and data code information in addition to the time and telephone number
data.
When there is multiple data in the unit, the name or telephone number are displayed.
scribe to a Caller ID service. The data for the caller ID from the telephone exchange is sent during the interval between the
first and second rings of the bell signal. The data from the telephone exchange is a modem signal which is modulated in an
FSK (Frequency Shift Keying) format. Data “0” is a 1300 Hz sine wave, and data 1 a 2100 Hz sine wave.
There are two type of the message format which can be received:i.e.the single data message format and multiple data mes-
sage format.
The multiple data format allows to transmit the name and data code information in addition to the time and telephone number
data.
When there is multiple data in the unit, the name or telephone number are displayed.
2. Circuit Operation
Refer to Check Sheet for Signal Route of CNG/DTMF/Caller ID detection detection (P.170).
6.4.9.
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 for Signal Route of CNG/DTMF detection (P.170).
6.4.10.
TAM Interface Circuit
This circuit is to switch between FAX receiving and the external TAM’s message recording automatically.
For details, please refer to TAM Interface Section (P.37).
For details, please refer to TAM Interface Section (P.37).
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