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. Call Tone Transmission
This call signal is generated in the ASIC (IC501) and sent to the speaker.
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 ASIC (IC501).
157
KX-FP101AL
Summary of Contents for KX-FP101AL
Page 7: ...1 11 ITU T Test Chart Actual size 7 KX FP101AL ...
Page 9: ...1 12 2 CONTROL PANEL 9 KX FP101AL ...
Page 18: ...1 14 12 REPLACING THE FILM CARTRIDGE 18 KX FP101AL ...
Page 19: ...19 KX FP101AL ...
Page 29: ...2 3 3 TROUBLESHOOTING ITEMS TABLE 29 KX FP101AL ...
Page 30: ...2 3 3 1 Simple Check List 30 KX FP101AL ...
Page 32: ...2 Document JAM 32 KX FP101AL ...
Page 36: ...6 Paper JAM 7 Multiple feed and skew 36 KX FP101AL ...
Page 39: ...Fig C 12 A blank page is received 39 KX FP101AL ...
Page 43: ...2 3 3 3 1 Defective facsimile section 1 Transmit problem 43 KX FP101AL ...
Page 50: ...50 KX FP101AL ...
Page 51: ...51 KX FP101AL ...
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Page 55: ...55 KX FP101AL ...
Page 56: ...56 KX FP101AL ...
Page 57: ...57 KX FP101AL ...
Page 65: ...I O and Pin No Diagram 65 KX FP101AL ...
Page 67: ...67 KX FP101AL ...
Page 68: ...68 KX FP101AL ...
Page 69: ...2 3 3 4 2 Check the Status of the Digital Board 69 KX FP101AL ...
Page 73: ...2 Troubleshooting Flow Chart 73 KX FP101AL ...
Page 75: ...2 3 3 7 Operation Panel Section 1 No key operation 2 No LCD indication 75 KX FP101AL ...
Page 78: ...2 3 3 9 CIS Contact Image Sensor Section Refer to 6 4 4 SCANNING BLOCK 78 KX FP101AL ...
Page 79: ...79 KX FP101AL ...
Page 80: ...2 3 3 10 Thermal Head Section Refer to 6 4 3 THERMAL HEAD 80 KX FP101AL ...
Page 93: ...2 4 7 3 PRINTOUT EXAMPLE 93 KX FP101AL ...
Page 94: ...94 KX FP101AL ...
Page 97: ...2 5 3 PRINT TEST PATTERN 1 Platen roller Reference pattern 97 KX FP101AL ...
Page 98: ...2 Left margin Top margin Reference pattern 98 KX FP101AL ...
Page 99: ...3 Thermal head 1 dot Reference pattern 99 KX FP101AL ...
Page 122: ...6 3 2 MEMORY MAP 122 KX FP101AL ...
Page 134: ...134 KX FP101AL ...
Page 144: ...6 4 6 3 2 Transmitting documents 6 4 6 3 3 Receiving FAX 144 KX FP101AL ...
Page 145: ...6 4 6 3 4 Copying 145 KX FP101AL ...
Page 163: ...163 KX FP101AL ...
Page 171: ...7 1 MEMO 171 KX FP101AL ...
Page 172: ...172 KX FP101AL ...
Page 176: ...9 1 MEMO KX FP101AL 176 ...
Page 180: ...11 1 MEMO KX FP101AL 180 ...
Page 182: ...12 1 MEMO KX FP101AL 182 ...
Page 184: ...13 1 MEMO KX FP101AL 184 ...
Page 186: ...14 1 MEMO KX FP101AL 186 ...
Page 188: ...15 1 MEMO KX FP101AL 188 ...
Page 189: ...16 TERMINAL GUIDE OF THE IC S TRANSISTORS AND DIODES 189 KX FP101AL ...
Page 190: ...17 FIXTURES AND TOOLS 190 KX FP101AL ...
Page 192: ...18 2 UPPER CABINET SECTION 192 KX FP101AL ...
Page 193: ...18 2 1 PICK UP BASE SECTION 193 KX FP101AL ...
Page 194: ...18 3 LOWER P C B SECTION 194 KX FP101AL ...
Page 195: ...18 4 MOTOR SECTION 195 KX FP101AL ...
Page 196: ...18 5 ACTUAL SIZE OF SCREWS AND WASHER 196 KX FP101AL ...
Page 197: ...19 ACCESSORIES AND PACKING MATERIALS 197 KX FP101AL ...