6.6.2. MODEM CIRCUIT OPERATION
The modem (IC505) has all the hardware satisfying the ITU-T standards mentioned previously.
When the ASIC IC501 (77) is brought to a low level, the modem (IC505) is chip-selected and the resistors inside IC are selected
by the select signals from ASIC (IC501) ADR0-ADR4. The commands are written through the data bus, and all the processing is
controlled by the ASIC (IC501) according to ITU-T procedures. The INT signal dispatched from IRQ1, 2 (pins 108 and 121 of
IC505) to ASIC (IC501) when the transmission data is accepted and the received data is demodulated, the ASIC (IC501)
implements post processing. This modem (IC505) has an automatic application equalizer.
With training signal 1 or 2 during G3 reception, it can automatically establish the optimum equalizer. The modem (IC505) operates
using the 32.256 MHz clock (X503).
1. Facsimile Transmission
The digital image data on the data bus is modulated in the modem (IC505), and sent from pin 69 via amplifier IC101 and the
NCU section to the telephone line.
Refer to 2.3.3.6. Analog Board Section.
2. Facsimile Reception
The analog image data which is received from the telephone line passes through the NCU section and enters pin 60 of the
modem (IC505). The signals that enter pin 60 of the modem (IC505) 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 2.3.3.6. Analog Board Section.
3. DTMF Transmission (Monitor tone)
The DTMF signal generated in the modem (IC505) is output from pin 69, and is then sent to the circuit on the same route as
used for facsimile transmission.
Refer to 2.3.3.6. Analog Board Section.
(DTMF Monitor Tone)
Refer to 2.3.3.6. Analog Board Section.
4. Call Tone Transmission
This is the call signal which is generated in the ASIC (IC501) and sent to the speaker.
Refer to 2.3.3.6. Analog Board Section.
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 (IC505) becomes
1, and this status is monitored by the ASIC (IC501).
177
KX-FP121AL / KX-FM131AL
Содержание KX-FP121AL
Страница 3: ...15 8 FIXTURES AND TOOLS 231 3 KX FP121AL KX FM131AL ...
Страница 9: ...1 11 ITU T No 1 Test Chart 9 KX FP121AL KX FM131AL ...
Страница 11: ...1 12 2 CONTROL PANEL 11 KX FP121AL KX FM131AL ...
Страница 13: ...1 13 1 Connecting to a computer KX FM131 ONLY 13 KX FP121AL KX FM131AL ...
Страница 18: ...1 14 7 ADDING PAPER TO THE PAPER TRAY 1 14 8 DOCUMENTS THE UNIT CAN FEED 18 KX FP121AL KX FM131AL ...
Страница 21: ...1 14 12 REPLACING THE FILM CARTRIDGE 21 KX FP121AL KX FM131AL ...
Страница 22: ...22 KX FP121AL KX FM131AL ...
Страница 29: ...Note The explanations given in the are for servicemen only 29 KX FP121AL KX FM131AL ...
Страница 33: ...2 3 3 TROUBLESHOOTING ITEMS TABLE 33 KX FP121AL KX FM131AL ...
Страница 34: ...2 3 3 1 Simple Check List 34 KX FP121AL KX FM131AL ...
Страница 36: ...2 Document JAM 36 KX FP121AL KX FM131AL ...
Страница 40: ...6 Paper JAM 7 Multiple feed and skew 40 KX FP121AL KX FM131AL ...
Страница 43: ...Fig C 12 A blank page is received 43 KX FP121AL KX FM131AL ...
Страница 47: ...2 3 3 3 1 Defective facsimile section 1 Transmit problem 47 KX FP121AL KX FM131AL ...
Страница 55: ...55 KX FP121AL KX FM131AL ...
Страница 56: ...56 KX FP121AL KX FM131AL ...
Страница 57: ...57 KX FP121AL KX FM131AL ...
Страница 58: ...58 KX FP121AL KX FM131AL ...
Страница 59: ...59 KX FP121AL KX FM131AL ...
Страница 60: ...60 KX FP121AL KX FM131AL ...
Страница 61: ...61 KX FP121AL KX FM131AL ...
Страница 62: ...62 KX FP121AL KX FM131AL ...
Страница 70: ...I O and Pin No Diagram 70 KX FP121AL KX FM131AL ...
Страница 72: ...72 KX FP121AL KX FM131AL ...
Страница 74: ...NG Example 74 KX FP121AL KX FM131AL ...
Страница 75: ...2 3 3 4 2 Check the Status of the Digital Board 75 KX FP121AL KX FM131AL ...
Страница 76: ...2 3 3 4 3 RS 232C serial communication KX FM131 only 76 KX FP121AL KX FM131AL ...
Страница 77: ...77 KX FP121AL KX FM131AL ...
Страница 80: ...Note Inside the digital board 80 KX FP121AL KX FM131AL ...
Страница 83: ...Refer to 2 3 3 5 Analog Board Section 83 KX FP121AL KX FM131AL ...
Страница 85: ...2 Troubleshooting Flow Chart 85 KX FP121AL KX FM131AL ...
Страница 87: ...2 3 3 7 Operation Panel Section 1 No key operation 2 No LCD indication 87 KX FP121AL KX FM131AL ...
Страница 90: ...2 3 3 9 CIS Contact Image Sensor Section Refer to 6 4 4 SCANNING BLOCK 90 KX FP121AL KX FM131AL ...
Страница 91: ...91 KX FP121AL KX FM131AL ...
Страница 92: ...2 3 3 10 Thermal Head Section Refer to 6 4 3 THERMAL HEAD 92 KX FP121AL KX FM131AL ...
Страница 93: ...2 3 3 11 PANA LINK 93 KX FP121AL KX FM131AL ...
Страница 94: ...94 KX FP121AL KX FM131AL ...
Страница 95: ...95 KX FP121AL KX FM131AL ...
Страница 96: ...96 KX FP121AL KX FM131AL ...
Страница 97: ...97 KX FP121AL KX FM131AL ...
Страница 100: ...100 KX FP121AL KX FM131AL ...
Страница 114: ...2 4 7 3 PRINTOUT EXAMPLE 114 KX FP121AL KX FM131AL ...
Страница 115: ...115 KX FP121AL KX FM131AL ...
Страница 118: ...2 5 3 PRINT TEST PATTERN 1 Platen roller Reference pattern 118 KX FP121AL KX FM131AL ...
Страница 119: ...2 Left margin Top margin Reference pattern 119 KX FP121AL KX FM131AL ...
Страница 120: ...3 Thermal head 1 dot Reference pattern 120 KX FP121AL KX FM131AL ...
Страница 143: ...6 3 2 MEMORY MAP 143 KX FP121AL KX FM131AL ...
Страница 155: ...155 KX FP121AL KX FM131AL ...
Страница 165: ...6 4 6 3 2 Transmitting documents 6 4 6 3 3 Receiving FAX 165 KX FP121AL KX FM131AL ...
Страница 166: ...6 4 6 3 4 Copying 166 KX FP121AL KX FM131AL ...
Страница 176: ...b Redundancy Compression Process Coding Mode This unit uses one dimensional MH format 176 KX FP121AL KX FM131AL ...
Страница 184: ...184 KX FP121AL KX FM131AL ...
Страница 190: ...190 KX FP121AL KX FM131AL ...
Страница 204: ...9 6 MEMO KX FP121AL KX FM131AL 204 ...
Страница 205: ...10 TERMINAL GUIDE OF THE IC S TRANSISTORS AND DIODES 205 KX FP121AL KX FM131AL ...
Страница 206: ...11 FIXTURES AND TOOLS 206 KX FP121AL KX FM131AL ...
Страница 207: ...12 CABINET MECHANICAL AND ELECTRICAL PARTS LOCATION 12 1 OPERATION PANEL SECTION 207 KX FP121AL KX FM131AL ...
Страница 208: ...12 2 UPPER CABINET SECTION 208 KX FP121AL KX FM131AL ...
Страница 209: ...12 2 1 PICK UP BASE SECTION 209 KX FP121AL KX FM131AL ...
Страница 210: ...12 3 LOWER CABINET P C B SECTION 210 KX FP121AL KX FM131AL ...
Страница 211: ...12 4 MOTOR SECTION 211 KX FP121AL KX FM131AL ...
Страница 212: ...12 5 ACTUAL SIZE OF SCREWS AND WASHER 212 KX FP121AL KX FM131AL ...
Страница 213: ...13 ACCESSORIES AND PACKING MATERIALS 213 KX FP121AL KX FM131AL ...