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KX-FT932BR-B
6.6.2.
Modem Circuit Operation
The modem (IC5) has all the hardware satisfying the CCITT standards mentioned previously.
When the ASIC IC1 (61) is brought to a low level, the modem (IC5) is chip-selected and the resistors inside IC are selected by the
select signals from ASIC (IC1) ADR0-ADR4. The commands are written through the data bus, and all the processing is controlled
by the ASIC (IC1) according to CCITT procedures. The INT signal dispatched from IRQ (pins 100 of IC5) to ASIC (IC1) when the
transmission data is accepted and the received data is demodulated, the ASIC (IC1) implements post processing. This modem
(IC5) has an automatic application equalizer.
With training signal 1 or 2 during G3 reception, it can automatically establish the optimum equalizer. The modem (IC5) operates
using the 32.256 MHz clock (X3).
1.
Facsimile Transmission
The digital image data on the data bus is modulated in the modem (IC5), and sent from pin 69 via Analog SW IC10, amplifier
IC9 and the NCU section to the telephone line.
Refer to
2.
Facsimile Reception
The analog image data which is received from the telephone line passes through the NCU section and enters pin 47 of the
modem (IC5). The signals that enter pin 47 of the modem (IC5) are demodulated in the board to digital image signals, then
placed on the data bus.
In this case, the image signals from the telephone line are transmitted serially. Hence, they are placed on the bus in 8 bit
units. 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 about 3 kHz and maintain a constant receiving
sensitivity. It can be set in the service mode.
Refer to
3.
DTMF Transmission (Monitor tone)
The DTMF signal generated in the modem (IC5) is output from pin 56, and is then sent to the circuit on the same route as
used for facsimile transmission.
Refer to
(DTMF Monitor Tone)
Refer to
4.
Call Tone Transmission
This is the call signal which is generated in the ASIC (IC1) and sent to the speaker.
Refer to
5.
Busy/Dial Tone Detection
The path is the same as FAX receiving. When it is detected, the carrier detect bit of the resistor in the modem (IC5) becomes
1, and this status is monitored by the ASIC (IC1).
6.
Caller ID Detection
The caller ID signal which is received from the telephone line/passes through IC1 pin (2-1). And it enters pin 50 of the modem
(IC5).
Содержание KX-FT932BR-B
Страница 11: ...11 KX FT932BR B 6 Technical Descriptions 6 1 Connection Diagram ...
Страница 21: ...21 KX FT932BR B 6 4 2 Block Diagram ...
Страница 23: ...23 KX FT932BR B ...
Страница 35: ...35 KX FT932BR B b Redundancy Compression Process Coding Mode This unit uses one dimensional MH format ...
Страница 60: ...60 KX FT932BR B 11 2 The Example of the Printed List 11 2 1 User Mode Example of a printed out list ...
Страница 61: ...61 KX FT932BR B 11 2 2 Service Mode Example of a printed out list ...
Страница 67: ...67 KX FT932BR B ...
Страница 68: ...68 KX FT932BR B CROSS REFERENCE Test Mode P 54 ...
Страница 69: ...69 KX FT932BR B CROSS REFERENCE Test Mode P 54 ...
Страница 70: ...70 KX FT932BR B CROSS REFERENCE Test Mode P 54 ...
Страница 71: ...71 KX FT932BR B ...
Страница 73: ...73 KX FT932BR B ...
Страница 74: ...74 KX FT932BR B ...
Страница 75: ...75 KX FT932BR B CROSS REFERENCE Test Mode P 54 ...
Страница 102: ...102 KX FT932BR B NG Wave pattern Note Refer to NG Example P 107 ...
Страница 104: ...104 KX FT932BR B I O and Pin No Diagram ...
Страница 106: ...106 KX FT932BR B ...
Страница 107: ...107 KX FT932BR B 12 5 5 3 NG Example ...
Страница 111: ...111 KX FT932BR B 12 5 7 2 Troubleshooting Flow Chart ...
Страница 115: ...115 KX FT932BR B 12 5 10 CIS Contact Image Sensor Section Refer to Scanning Block P 24 CROSS REFERENCE Test Mode P 54 ...
Страница 116: ...116 KX FT932BR B 12 5 11 Thermal Head Section Refer to Thermal Head P 22 ...
Страница 117: ...117 KX FT932BR B 13 Service Fixture Tools ...
Страница 120: ...120 KX FT932BR B 14 2 Disassembly Procedurel 14 2 1 How to Remove the Operation Panel Block ...
Страница 121: ...121 KX FT932BR B 14 2 2 How to Remove the Operation Board LCD and Platen Roller ...
Страница 122: ...122 KX FT932BR B 14 2 3 How to Remove the Separation Holder and Document Feed Support ...
Страница 123: ...123 KX FT932BR B 14 2 4 How to Remove the Image Sensor CIS and Feed Roller ...
Страница 124: ...124 KX FT932BR B 14 2 5 How to Remove the Lock Lever and Thermal Head ...
Страница 125: ...125 KX FT932BR B 14 2 6 How to Remove the Bottom Frame ...
Страница 126: ...126 KX FT932BR B 14 2 7 How to Remove the Analog Board Digital Board Power Supply Board and Power Cord ...
Страница 127: ...127 KX FT932BR B 14 2 8 How to Remove the Gear Block and Separation Roller 14 2 9 How to Remove the Motor of Gear Block ...
Страница 128: ...128 KX FT932BR B 14 2 10 Installation Position of the Lead Wires ...
Страница 134: ...134 KX FT932BR B 15 2 3 Mechanical Movements in the Main Operations 15 2 3 1 Idle Status ...
Страница 136: ...136 KX FT932BR B 15 2 3 4 Copying CROSS REFERENCE Sensor Section P 114 ...
Страница 140: ...140 KX FT932BR B 16 1 4 Power Supply Board ...
Страница 143: ...143 KX FT932BR B 16 3 Test Chart 16 3 1 ITU T No 1 Test Chart ...
Страница 144: ...144 KX FT932BR B 16 3 2 ITU T No 2 Test Chart ...
Страница 145: ...145 KX FT932BR B MEMO ...
Страница 152: ...152 KX FT932BR B MEMO ...
Страница 161: ...161 KX FT932BR B MEMO ...
Страница 163: ...163 KX FT932BR B 20 1 2 Upper Cabinet Section ...
Страница 164: ...164 KX FT932BR B 20 1 3 Lower Cabinet Section ...
Страница 165: ...165 KX FT932BR B 20 1 4 Gear Block Section ...
Страница 166: ...166 KX FT932BR B 20 1 5 Screws ...
Страница 167: ...167 KX FT932BR B 20 1 6 Accessories and Packing Materials ...