6.6.2. MODEM CIRCUIT OPERATION
The ASIC (IC1) has all the hardware satisfying the ITU-T standards mentioned previously.
The modem is included in IC1. The signal communicates with the TEL line through the analog front end IC (IC5) of digital/analog,
analog/digital convertor. The modem in IC1 is operated using the 20.736 MHz (x2) clock.
1. Facsimile Transmission/DTMF Line Send
The digital image data on the data bus is modulated in the modem (IC1), and sent to analog front end (IC5) as the digital data,
then it is converted to the analog signal there. Passing through IC9 and IC6, the signal is sent to NCU section.
[IC1
→
IC5
→
IC5(3)
→
C48
→
R37
→
R38
→
IC9 (2)
→
IC9 (1)
→
C53
→
IC6 (2)
→
IC6 (1)
→
C58
→
R49
→
IC9 (6)
→
IC9
(7)
→
CN10 (1)]
→
CN202 (1)
→
C106
→
R103
→
R102
→
T101
→
C8
→
Q4 (C)
→
Q4 (E)
→
D1
→
TEL LINE
[ ]: Digital section
2. Facsimile Reception
The analog image data which is received from the telephone line passes through the NCU section and enters pin 15 of the
analog front end (IC5). The signals that enter pin 15 of the analog front end (IC5) convert the analog signals to the digital
signals, then the data is sent to the modem (IC1).
TEL LINE
→
D1
→
Q4 (E)
→
Q4 (C)
→
C8
→
T101
→
R104
→
C107
→
R112
→
IC101 (6)
→
IC101 (7)
→
C127
→
IC103
(11)
→
IC103 (10)
→
CN102 (10)
→
[CN9 (10)
→
IC6 (10)
→
IC6 (11)
→
R33
→
C43
→
IC5 (15)
→
IC5
→
IC1]
[ ]: Digital section
3. DTMF Transmission
The DTMF signal generated in the ASIC (IC1) is sent to the analog front end (IC5) to perform the digital/analog conversion, then
output from pin 3 of IC5, and is then sent to the circuit on the same route as used for facsimile transmission.
(DTMF Monitor Tone)
[IC1
→
IC5
→
IC5(3)
→
C48
→
R37
→
R38
→
IC9 (2)
→
IC9 (1)
→
C54
→
R44
→
IC8 (2)
→
IC8 (1)
→
C27
→
R13
→
IC1
(62)
→
IC1 (63)
→
C62
→
IC8 (5)
→
IC8 (7)
→
C67
→
CN10 (9)]
→
CN202 (9)
→
R122
→
IC102 (4)
→
IC102 (5)
→
SPEAKER
[ ]: Digital section
4. Call Tone Transmission
This is the call signal which is generated in the ASIC (IC1) and sent to the speaker.
[IC1 (59)
→
R28
→
C45
→
R35
→
IC8 (2)
→
IC8 (1)
→
C27
→
R13
→
IC1 (62)
→
IC1 (63)
→
C62
→
IC8 (5)
→
IC8 (7)
→
C67
→
CN10 (9)]
→
CN202 (9)
→
R122
→
IC102 (4)
→
IC102 (5)
→
SPEAKER
[ ]: Digital section
5. Busy/Dial Tone Detection
The path is the same as FAX receiving.
128
KX-FT21RS
Содержание KX-FT21RS
Страница 8: ...1 10 CCITT No 1 TEST CHART 8 KX FT21RS ...
Страница 9: ...1 11 LOCATION OF CONTROLS 1 11 1 OVERVIEW 1 11 2 CONTROL PANEL 9 KX FT21RS ...
Страница 15: ...1 14 2 1 MAINTENANCE LIST 1 14 2 2 MAINTENANCE CYCLE 15 KX FT21RS ...
Страница 22: ...2 3 3 Simple Check List 22 KX FT21RS ...
Страница 23: ...2 3 4 TROUBLESHOOTING ITEMS TABLE 23 KX FT21RS ...
Страница 24: ...2 3 4 1 ADF Auto Document Feed Section 1 No document feed 24 KX FT21RS ...
Страница 25: ...2 Paper JAM 25 KX FT21RS ...
Страница 27: ...4 Skew 27 KX FT21RS ...
Страница 28: ...5 Image is distorted When printing 28 KX FT21RS ...
Страница 29: ...6 Black or white vertical lines appear 7 Skewed receiving image 29 KX FT21RS ...
Страница 31: ...31 KX FT21RS ...
Страница 33: ...2 3 4 2 1 Defective facsimile section 1 Transmit problem 33 KX FT21RS ...
Страница 34: ...2 Sometimes there is a transmit problem 34 KX FT21RS ...
Страница 36: ...4 The unit can copy but cannot transmit receive 36 KX FT21RS ...
Страница 40: ...7 How to output the Journal Report 40 KX FT21RS ...
Страница 42: ...Countermeasure 42 KX FT21RS ...
Страница 43: ...43 KX FT21RS ...
Страница 44: ...44 KX FT21RS ...
Страница 45: ...45 KX FT21RS ...
Страница 46: ...46 KX FT21RS ...
Страница 47: ...47 KX FT21RS ...
Страница 48: ...48 KX FT21RS ...
Страница 49: ...49 KX FT21RS ...
Страница 51: ...1 Entering the remote programming mode and changing service codes 51 KX FT21RS ...
Страница 57: ...Normal Wave Patterns 57 KX FT21RS ...
Страница 60: ...60 KX FT21RS ...
Страница 61: ...NG Example 61 KX FT21RS ...
Страница 64: ...1 Defective ITS Integrated Telephone System Section 64 KX FT21RS ...
Страница 66: ...2 Troubleshooting Flow Chart 66 KX FT21RS ...
Страница 67: ...67 KX FT21RS ...
Страница 69: ...2 3 4 6 Operation Board Section 1 No key operation 2 No LCD indication 69 KX FT21RS ...
Страница 71: ...2 3 4 8 Read Section Refer to 6 4 4 SCANNING BLOCK 71 KX FT21RS ...
Страница 72: ...72 KX FT21RS ...
Страница 73: ...2 3 4 9 Thermal Head Section Refer to 6 4 3 THERMAL HEAD 73 KX FT21RS ...
Страница 78: ...2 4 6 OTHER 78 KX FT21RS ...
Страница 79: ...2 5 TEST FUNCTIONS 79 KX FT21RS ...
Страница 82: ...2 6 1 PRINTOUT EXAMPLE 82 KX FT21RS ...
Страница 84: ...4 DISASSEMBLY INSTRUCTIONS 84 KX FT21RS ...
Страница 85: ...85 KX FT21RS ...
Страница 86: ...86 KX FT21RS ...
Страница 87: ...87 KX FT21RS ...
Страница 88: ...88 KX FT21RS ...
Страница 89: ...89 KX FT21RS ...
Страница 90: ...90 KX FT21RS ...
Страница 91: ...91 KX FT21RS ...
Страница 92: ...92 KX FT21RS ...
Страница 93: ...93 KX FT21RS ...
Страница 94: ...94 KX FT21RS ...
Страница 96: ...5 3 FLAT PACKAGE IC INSTALLATION PROCEDURE 5 4 BRIDGE MODIFICATION PROCEDURE 96 KX FT21RS ...
Страница 112: ...112 KX FT21RS ...
Страница 117: ...6 4 6 3 2 Scanning 6 4 6 3 3 Printing Note See 6 5 SENSERS AND SWITCHES 117 KX FT21RS ...
Страница 118: ...6 4 6 3 4 Copying 118 KX FT21RS ...
Страница 127: ...b Redundancy Compression Process Coding Mode This unit uses one dimensional MH format 127 KX FT21RS ...
Страница 151: ...10 TERMINAL GUIDE OF THE IC S TRANSISTORS AND DIODES 151 KX FT21RS ...
Страница 152: ...11 FIXTURES AND TOOLS 152 KX FT21RS ...
Страница 153: ...12 CABINET MECHANICAL AND ELECTRICAL PARTS LOCATION 12 1 OPERATION PANEL SECTION 153 KX FT21RS ...
Страница 154: ...12 2 UPPER CABINET SECTION 154 KX FT21RS ...
Страница 155: ...12 3 LOWER CABINET P C B SECTION 155 KX FT21RS ...
Страница 157: ...12 5 ACTUAL SIZE OF SCREWS AND WASHER 157 KX FT21RS ...
Страница 158: ...13 ACCESSORIES AND PACKING MATERIALS 158 KX FT21RS ...