7.3.5.4.5. LINE AMPLIFIER AND SIDE TONE CIRCUIT
1. Circuit Operation
The reception signal output from the line transformer T203 is
input to pin (6) of IC207 via R269, C285 and then the signal is
amplified at pin (7) of IC207 and sent to the reception system at
8.1dB.
The transmission signal goes through C243, R276 and enters
IC207-pin (2), where the signal is amplified to about 15.8dB. Then,
it is output from pin (1) of IC207 and transmitted to T203 via C312,
R293 and R292. Without a side tone circuit, the transmission
signal will return to the reception amplifier via R269, C285. When
the side tone circuit is active, the signal output from IC207 pin (1)
passes through C312, R291, C306, R284, R280, C300, R267 and
C288 and goes into the amplifier IC207 pin (5). This circuit is used
to cancel the transmission return signal.
The TX signal is output to the circuit analog the route from the
IC207 1 pin C312 R293 R292 T203 TEL LINE.
However, if balance is lost in the bridge, a voltage occurs between
the IC207 6 pin and 5 pin and a side tone results, because the
balance cannot be maintained completely at all frequencies in the
audio range some side tone always occur.
7.3.5.4.6. REMOTE FAX ACTIVATION CIRCUIT
1. Function
Another telephone connected to same line activates the unit to
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Содержание KX-FLM551
Страница 12: ...1 11 2 ITU T No 2 TEST CHART 12 ...
Страница 13: ...1 12 LOCATION OF CONTROLS 1 12 1 OVERVIEW 13 ...
Страница 49: ...CROSS REFERENCE HIGH VOLTAGE SECTION 2 3 4 4 DIRTY AND HALF DARKNESS BACKGROUND 49 ...
Страница 50: ...CROSS REFERENCE HIGH VOLTAGE SECTION 2 3 4 5 BLACK PRINT 50 ...
Страница 51: ...CROSS REFERENCE HIGH VOLTAGE SECTION 2 3 4 6 LIGHT PRINT 51 ...
Страница 52: ...CROSS REFERENCE HIGH VOLTAGE SECTION 2 3 4 7 BLACK DENSITY IS LIGHT OR UNEVEN 52 ...
Страница 53: ...CROSS REFERENCE HIGH VOLTAGE SECTION 2 3 4 8 BLANK PRINT 53 ...
Страница 54: ...2 3 4 9 BLACK WHIT POINT 2 3 5 RECORDING PAPER FEED 2 3 5 1 MULTIPLE FEED 54 ...
Страница 55: ...2 3 5 2 THE PRINTING PAPER IS WAVED OR WRINKLED 55 ...
Страница 56: ...56 ...
Страница 57: ...2 3 5 3 SKEW 57 ...
Страница 58: ...58 ...
Страница 60: ...CROSS REFERENCE SENSOR SECTION MOTOR SECTION 2 3 6 2 DOCUMENT JAM 60 ...
Страница 62: ...2 3 6 4 SKEW 62 ...
Страница 63: ...2 3 6 5 THE SENT FAX DATA IS SKEWED 63 ...
Страница 65: ...2 3 6 8 BLACK OR WHITE VERTICAL LINE 65 ...
Страница 66: ...2 3 6 9 AN ABNORMAL IMAGE IS COPIED 66 ...
Страница 79: ...79 ...
Страница 80: ...CROSS REFERENCE TEST FUNCTIONS 80 ...
Страница 81: ...CROSS REFERENCE TEST FUNCTIONS 81 ...
Страница 82: ...CROSS REFERENCE TEST FUNCTIONS 82 ...
Страница 83: ...CROSS REFERENCE TEST FUNCTIONS 83 ...
Страница 84: ...84 ...
Страница 85: ...85 ...
Страница 86: ...86 ...
Страница 95: ...CROSS REFERENCE CHECK THE STATUS OF THE DIGITAL BOARD 2 3 8 2 NG EXAMPLE 95 ...
Страница 96: ...2 3 8 3 CHECK THE STATUS OF THE DIGITAL BOARD 96 ...
Страница 103: ...2 3 9 7 LSU SECTION 103 ...
Страница 104: ...CROSS REFERENCE LSU Laser Scanning Unit SECTION 2 3 10 CIS contact Image Sensor SECTION 104 ...
Страница 105: ...2 3 11 HIGH VOLTAGE SECTION 105 ...
Страница 106: ...106 ...
Страница 107: ...107 ...
Страница 108: ...108 ...
Страница 109: ...109 ...
Страница 112: ...112 ...
Страница 113: ...113 ...
Страница 115: ...2 4 3 USER MODE The list below is an example of the SYSTEM SETUP LIST the unit prints out Note 115 ...
Страница 126: ...126 ...
Страница 137: ...2 8 2 Scan 137 ...
Страница 139: ...4 2 HOW TO REMOVE THE OPERATION PANEL BLOCK 139 ...
Страница 140: ...4 3 HOW TO REMOVE THE OPERATION BOARD 140 ...
Страница 141: ...4 4 HOW TO REMOVE THE TRANSFER ROLLER AND IMAGE SENSOR 141 ...
Страница 143: ...4 7 HOW TO REMOVE THE AC INLET AND LOW VOLTAGE POWER SUPPLY BOARD 143 ...
Страница 144: ...4 8 HOW TO REMOVE THE DIGITAL BOARD AND MOTOR DRIVE BOARD 144 ...
Страница 145: ...4 9 HOW TO REMOVE THE BACK COVER SECTION 145 ...
Страница 146: ...4 10 HOW TO REMOVE THE FUSER UNIT AND HANDSET CRADLE 146 ...
Страница 147: ...4 11 HOW TO REMOVE THE MAIN FRAME AND FAN 4 12 HOW TO REMOVE THE HIGH VOLTAGE POWER SUPPLY BOARD 147 ...
Страница 148: ...4 13 HOW TO REMOVE THE HEAT ROLLER AND EXIT ROLLER 148 ...
Страница 149: ...4 14 HOW TO REMOVE THE PRESSURE ROLLER 149 ...
Страница 150: ...4 15 HOW TO REMOVE THE MOTOR BLOCK 150 ...
Страница 151: ...151 ...
Страница 152: ...152 ...
Страница 153: ...4 16 INSTALLATION POSITION OF THE LEAD 153 ...
Страница 154: ...154 ...
Страница 155: ...155 ...
Страница 156: ...156 ...
Страница 166: ...6 8 TIMING CHART When Printing Two Sheets of Paper 166 ...
Страница 172: ...6 14 Timing Chart Initializing Short 172 ...
Страница 174: ...7 CIRCUIT OPERATIONS 7 1 CONNECTION DIAGRAM 7 1 1 CONNECTION DIAGRAM 1 174 ...
Страница 175: ...7 1 2 CONNECTION DIAGRAM 2 175 ...
Страница 176: ...7 1 3 POWER SUPPLY FLOW 176 ...
Страница 181: ...7 3 2 1 ASIC IC604 PIN LAYOUT 181 ...
Страница 182: ...7 3 2 2 EXPLANATION OF PIN DISTRIBUTION 7 3 2 2 1 IC604 182 ...
Страница 217: ...217 ...
Страница 218: ...7 9 SENSORS AND SWITCHES SECTION All of the sensor and switches are shown below 218 ...
Страница 241: ...9 FIXTURES AND TOOLS 241 ...
Страница 242: ...10 CABINET MECHANICAL AND ELECTRICAL PARTS LOCATION 10 1 GENERAL SECTON 242 ...
Страница 243: ...10 2 OPERATION PANEL SECTION 10 2 1 OPERATION PANEL BLOCK 1 243 ...
Страница 244: ...10 2 2 OPERATION PANEL BLOCK 2 244 ...
Страница 245: ...245 ...
Страница 246: ...10 3 CABINET P C B BLOCK 246 ...
Страница 247: ...10 4 PICK UP BLOCK 247 ...
Страница 248: ...10 5 CABINET BLOCK 248 ...
Страница 249: ...10 6 FUSER BLOCK 249 ...
Страница 250: ...10 7 MAIN FRAME BLOCK 250 ...
Страница 251: ...251 ...
Страница 252: ...10 8 MOTOR BLOCK 10 9 ACTUAL SIZE OF SCREWS AND WASHER 252 ...
Страница 253: ...11 ACCESSORIES AND PACKING MATERIALS 253 ...
Страница 254: ...254 ...
Страница 283: ...16 7 SENSOR BOARD PCB7 16 8 VARISTOR BOARD PCB8 HI Q KXFLM551 Printed in Japan 283 ...
Страница 291: ...A B C D E F G PCB CH AUTO CH CN51 1 5 P FUP1257ZA C 01 06 25 PS50 CN50 3 1 C50 COMPONENT VIEW BOTTOM VIEW ...
Страница 292: ...PCB CH J61 J60 ZNR60 01 06 25 PFUP1257ZA D COMPONENT VIEW BOTTOM VIEW ...
Страница 312: ...CN51 1 TEMP 2 GND 3 VIN 4 SIG 5 VOUT PS50 1 2 3 4 NC C50 CN50 1 THERM 2 NC 3 GND ...
Страница 313: ...ZNR60 271 ...