6.6.2. MODEM CIRCUIT OPERATION
The modem (IC505) has all the hardware satisfying the CCITT 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(pin 107~111). Commands are written through the data bus, and all
processing is controlled by the ASIC (IC501) according to CCITT procedures. Here, the INT signal dispatched from IRQ (pin 52 of
IC505) to the ASIC (IC501) implements post processing.
This modem (IC505) 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 (IC505) clock is supplied by pin 70 of ASIC (IC501).
1. Facsimile Transmission/DTMF Line Send
The digital image data on the data bus is modulated in the modem (IC505), and sent from pin 44 via amplifier IC511 (24
→
25),
and the NCU section to the telephone line.
Refer to 2.3.3.5. 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 45 of the
modem (IC505). The signals that enter pin 45 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 around 3 kHz and maintain a constant receiving
sensitivity.
It can be set in the service mode.
Refer to 2.3.3.5. Analog Board Section.
3. DTMF Transmission (Monitor tone)
The DTMF signal generated in the modem (IC505) is output from pin 44, and the NCU section to the telephone line the same
as facsimile transmission signals.
(DTMF Monitor Tone)
Refer to 2.3.3.5. Analog Board Section.
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 (IC505) becomes
1, and this status is monitored by ASIC (IC501).
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KX-FP101
Summary of Contents for KX-FP105BX
Page 36: ...1 11 CCITT No 1 Test Chart Actual size 8 KX FP101 ...
Page 38: ...1 12 2 CONTROL PANEL 10 KX FP101 ...
Page 58: ...2 3 3 TROUBLESHOOTING ITEMS TABLE 30 KX FP101 ...
Page 59: ...2 3 3 1 Simple Check List 31 KX FP101 ...
Page 61: ...2 Document JAM 33 KX FP101 ...
Page 65: ...6 Paper JAM 7 Multiple feed and skew 37 KX FP101 ...
Page 68: ...Fig C 12 A blank page is received 40 KX FP101 ...
Page 72: ...2 3 3 3 1 Defective facsimile section 1 Transmit problem 44 KX FP101 ...
Page 80: ...52 KX FP101 ...
Page 81: ...53 KX FP101 ...
Page 82: ...54 KX FP101 ...
Page 83: ...55 KX FP101 ...
Page 84: ...56 KX FP101 ...
Page 85: ...57 KX FP101 ...
Page 86: ...58 KX FP101 ...
Page 87: ...59 KX FP101 ...
Page 92: ...2 3 3 4 1 Digital Block Diagram 64 KX FP101 ...
Page 95: ...I O and Pin No Diagram 67 KX FP101 ...
Page 97: ...69 KX FP101 ...
Page 98: ...NG Example 70 KX FP101 ...
Page 99: ...2 3 3 4 2 Check the Status of the Digital Board 71 KX FP101 ...
Page 101: ...Note Inside the digital board 73 KX FP101 ...
Page 105: ...2 Troubleshooting Flow Chart 77 KX FP101 ...
Page 107: ...2 3 3 7 Operation Panel Section 1 No key operation 2 No LCD indication 79 KX FP101 ...
Page 110: ...2 3 3 9 CIS Contact Image Sensor Section Refer to 6 4 4 SCANNING BLOCK 82 KX FP101 ...
Page 111: ...83 KX FP101 ...
Page 112: ...2 3 3 10 Thermal Head Section Refer to 6 4 3 THERMAL HEAD 84 KX FP101 ...
Page 125: ...2 4 7 3 PRINTOUT EXAMPLE 97 KX FP101 ...
Page 126: ...98 KX FP101 ...
Page 129: ...2 5 3 PRINT TEST PATTERN 1 Platen roller Reference pattern 101 KX FP101 ...
Page 130: ...2 Left margin Top margin Reference pattern 102 KX FP101 ...
Page 131: ...3 Thermal head 1 dot Reference pattern 103 KX FP101 ...
Page 154: ...6 3 2 MEMORY MAP 126 KX FP101 ...
Page 166: ...138 KX FP101 ...
Page 176: ...6 4 6 3 2 Transmitting documents 6 4 6 3 3 Receiving FAX 148 KX FP101 ...
Page 177: ...6 4 6 3 4 Copying 149 KX FP101 ...
Page 212: ...12 1 MEMO KX FP101 184 ...
Page 214: ...13 1 MEMO KX FP101 186 ...
Page 216: ...14 1 MEMO KX FP101 188 ...
Page 218: ...15 1 MEMO KX FP101 190 ...
Page 220: ...16 1 MEMO KX FP101 192 ...
Page 221: ...17 TERMINAL GUIDE OF THE IC S TRANSISTORS AND DIODES 193 KX FP101 ...
Page 222: ...18 FIXTURES AND TOOLS 194 KX FP101 ...
Page 223: ...19 CABINET MECHANICAL AND ELECTRICAL PARTS LOCATION 19 1 OPERATION PANEL SECTION 195 KX FP101 ...
Page 224: ...19 2 UPPER CABINET SECTION 196 KX FP101 ...
Page 225: ...19 2 1 PICK UP BASE SECTION 197 KX FP101 ...
Page 226: ...19 3 LOWER P C B SECTION 198 KX FP101 ...
Page 227: ...19 4 MOTOR SECTION 199 KX FP101 ...
Page 228: ...19 5 ACTUAL SIZE OF SCREWS AND WASHER 200 KX FP101 ...
Page 229: ...20 ACCESSORIES AND PACKING MATERIALS 201 KX FP101 ...