7.3.3. MODEM CIRCUIT OPERATION
The modem (IC600) has all the hardware satisfying the CCITT standards mentioned previously.
When the ASIC IC606 (114) is brought to a low level, the modem (IC600) is chip-selected and the resistors inside IC are selected
by the select signals from ASIC (IC606) ADR0-ADR4(pin 84~88). Commands are written through the data bus, and all processing
is controlled by the ASIC (IC606) according to CCITT procedures. Here, the INT signal dispatched from IRQ (pin 108 of IC600) to
the ASIC (IC606) implements post processing.
This modem (IC600) has an automatic application equalizer. With training signal 1 or 2 at the time of G3 reception, it can
automatically establish the optimum equalizer. The modem (IC600) operates using the 32.256MHz clock (X600).
1. Facsimile Transmission/DTMF Line Send
The digital image data on the data bus is modulated in the modem (IC600), and sent from pin 69 via modem IC600, Analog gate
array IC207(24
→
22), amplifier IC204(6
→
7) and the NCU section to the telephone line.
Refer to CHECK SHEET(P.128).
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 (IC600). The signals that enter pin 60 of the modem (IC600) 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 around 3 kHz and maintain a constant receiving
sensitivity.
It can be set in the service mode.
Refer to CHECK SHEET(P.128).
3. DTMF Transmission (Monitor tone)
The DTMF signal generated in the modem (IC600) is output from pin 69, and the NCU section to the telephone line the same
as facsimile transmission signals.
(DTMF Monitor Tone)
Refer to CHECK SHEET(P.128).
4. 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 (IC600) becomes
1, and this status is monitored by ASIC (IC606).
5. Call Tone Transmission
This is the call signal which is generated the ASIC (IC606) and sent to the speaker.
157
KX-FL612CX / KX-FL612CX-S
Summary of Contents for KX-FL612CX
Page 12: ...3 INSTALLATION 3 1 LOCATION OF CONTROLS 3 1 1 OVERVIEW 12 KX FL612CX KX FL612CX S ...
Page 13: ...3 1 2 CONTROL PANEL 13 KX FL612CX KX FL612CX S ...
Page 40: ...5 DISASSEMBLY INSTRUCTIONS 40 KX FL612CX KX FL612CX S ...
Page 43: ...5 3 HOW TO REMOVE THE OPERATION PANEL ASS Y 43 KX FL612CX KX FL612CX S ...
Page 44: ...5 4 HOW TO REMOVE THE PICK UP UNIT 44 KX FL612CX KX FL612CX S ...
Page 45: ...5 5 HOW TO REMOVE THE PICK UP ROLLER 45 KX FL612CX KX FL612CX S ...
Page 46: ...5 6 HOW TO REMOVE THE OPERATION BOARD 46 KX FL612CX KX FL612CX S ...
Page 48: ...5 9 HOW TO REMOVE THE TRANSFER ROLLER 48 KX FL612CX KX FL612CX S ...
Page 49: ...5 10 HOW TO REMOVE THE SEPARATION ROLLER 49 KX FL612CX KX FL612CX S ...
Page 54: ...5 19 HOW TO REMOVE THE MAIN MOTOR 54 KX FL612CX KX FL612CX S ...
Page 55: ...5 20 HOW TO REMOVE THE FUSER UNIT 55 KX FL612CX KX FL612CX S ...
Page 56: ...5 21 HOW TO REMOVE THE CIS 56 KX FL612CX KX FL612CX S ...
Page 58: ...5 23 INSTALLATION POSITION OF THE LEAD 58 KX FL612CX KX FL612CX S ...
Page 93: ...6 5 7 6 LIGHT PRINT CROSS REFERENCE HIGH VOLTAGE SECTION P 140 93 KX FL612CX KX FL612CX S ...
Page 95: ...6 5 7 8 BLANK PRINT 6 5 7 9 BLACK OR WHITE POINT 95 KX FL612CX KX FL612CX S ...
Page 97: ...6 5 8 3 SKEW 97 KX FL612CX KX FL612CX S ...
Page 103: ...CROSS REFERENCE MOTOR SECTION P 135 103 KX FL612CX KX FL612CX S ...
Page 104: ...6 5 9 2 SKEW ADF 104 KX FL612CX KX FL612CX S ...
Page 106: ...6 5 9 5 THE RECEIVED OR COPIED DATA IS EXPANDED 106 KX FL612CX KX FL612CX S ...
Page 107: ...6 5 9 6 BLACK OR WHITE VERTICAL LINE IS COPIED 107 KX FL612CX KX FL612CX S ...
Page 117: ...117 KX FL612CX KX FL612CX S ...
Page 120: ...CROSS REFERENCE TEST FUNCTIONS P 64 120 KX FL612CX KX FL612CX S ...
Page 121: ...CROSS REFERENCE TEST FUNCTIONS P 64 121 KX FL612CX KX FL612CX S ...
Page 122: ...CROSS REFERENCE TEST FUNCTIONS P 64 122 KX FL612CX KX FL612CX S ...
Page 123: ...CROSS REFERENCE TEST FUNCTIONS P 64 123 KX FL612CX KX FL612CX S ...
Page 124: ...124 KX FL612CX KX FL612CX S ...
Page 125: ...125 KX FL612CX KX FL612CX S ...
Page 126: ...CROSS REFERENCE TEST FUNCTIONS P 64 126 KX FL612CX KX FL612CX S ...
Page 135: ...6 5 13 6 MOTOR SECTION 6 5 13 6 1 ENGINE MOTOR 135 KX FL612CX KX FL612CX S ...
Page 136: ...6 5 13 6 2 ADF MOTOR 136 KX FL612CX KX FL612CX S ...
Page 140: ...6 5 16 HIGH VOLTAGE SECTION 140 KX FL612CX KX FL612CX S ...
Page 141: ...141 KX FL612CX KX FL612CX S ...
Page 142: ...142 KX FL612CX KX FL612CX S ...
Page 145: ...6 5 17 2 TROUBLESHOOTING FLOW CHART 145 KX FL612CX KX FL612CX S ...
Page 147: ...7 CIRCUIT OPERATIONS 7 1 CONNECTION DIAGRAM 147 KX FL612CX KX FL612CX S ...
Page 149: ...149 KX FL612CX KX FL612CX S ...
Page 167: ...7 7 1 2 ENGINE MOTOR DRIVE CIRCUIT 167 KX FL612CX KX FL612CX S ...
Page 173: ...7 10 LSU Laser Scanning Unit SECTION 173 KX FL612CX KX FL612CX S ...
Page 174: ...174 KX FL612CX KX FL612CX S ...
Page 181: ...181 KX FL612CX KX FL612CX S ...
Page 202: ...8 1 8 TIMING CHART When Printing Two Sheets of Paper BASIC 202 KX FL612CX KX FL612CX S ...
Page 203: ...8 1 9 Timing Chart Initializing Long 203 KX FL612CX KX FL612CX S ...
Page 205: ...8 2 TERMINAL GUIDE OF THE ICs TRANSISTORS AND DIODES 205 KX FL612CX KX FL612CX S ...
Page 209: ...8 4 1 NG EXAMPLE 209 KX FL612CX KX FL612CX S ...
Page 215: ...215 KX FL612CX KX FL612CX S ...
Page 216: ...8 6 TEST CHART 8 6 1 ORIGINAL TEST CHART 216 KX FL612CX KX FL612CX S ...
Page 217: ...8 6 2 ITU T No 1 TEST CHART 217 KX FL612CX KX FL612CX S ...
Page 218: ...8 6 3 ITU T No 2 TEST CHART 218 KX FL612CX KX FL612CX S ...
Page 219: ...9 FIXTURES AND TOOLS 219 KX FL612CX KX FL612CX S ...
Page 221: ...10 2 OPERATION COVER SECTION 1 221 KX FL612CX KX FL612CX S ...
Page 222: ...10 3 OPERATION COVER SECTION 2 222 KX FL612CX KX FL612CX S ...
Page 223: ...10 4 OPERATION COVER SECTION 3 223 KX FL612CX KX FL612CX S ...
Page 224: ...10 5 PICK UP SECTION 224 KX FL612CX KX FL612CX S ...
Page 225: ...10 6 FUSER SECTION 225 KX FL612CX KX FL612CX S ...
Page 226: ...10 7 UPPER MAIN CABINET SECTION 226 KX FL612CX KX FL612CX S ...
Page 227: ...10 8 LOWER MAIN CABINET SECTION 1 227 KX FL612CX KX FL612CX S ...
Page 228: ...10 9 LOWER MAIN CABINET SECTION 2 228 KX FL612CX KX FL612CX S ...
Page 229: ...10 10 LOWER CABINET SECTION 3 229 KX FL612CX KX FL612CX S ...
Page 230: ...10 11 ACTUAL SIZE OF SCREWS AND WASHER 230 KX FL612CX KX FL612CX S ...
Page 231: ...11 ACCESSORIES AND PACKING MATERIALS 231 KX FL612CX KX FL612CX S ...
Page 243: ...Memo 243 KX FL612CX KX FL612CX S ...
Page 266: ...266 KX FL612CX KX FL612CX S HI Q KXFL612CX KXFL612CXS ...