6.8.5. LINE AMPLIFIER AND SIDE TONE CIRCUIT
1. Circuit Operation
The reception signal output from the line transformer T101 is input to pin (6) of IC101 via C126 and R131, and then the signal
is amplified at pin (7) of IC101 and sent to the reception system at 12dB.
The transmission signal goes through C131 and R137 and enters IC101-pin (2), where the signal is amplified to about 18dB.
Then, it is output from pin (1) of IC101 and transmitted to T101 via C133, R219, R125 and C213. If the side tone circuit is not
applied, the transmission signal will return to the reception amplifier via C126, R131, R222 and C229. When the side tone circuit
is active, the signal output from IC101 pin (1) passes through C133, R221, R216, R127, C123, R223 and C219 and goes into
the amplifier IC101 pin (5). This circuit is used to cancel the transmission return signal.
6.8.6.
AUTO DISCONNECT CIRCUIT
1. Function
This circuit is used to detect that the telephone connected in parallel to the same line is OFF-hook while the unit picks up the
line. If this detection circuit is activated when TAM is being recorded, the recording stops and the circuit is automatically
released.
2. Circuit Operation
If the line is picked up, C105 is charged by following the path shown below.
D6 (+)
→
R103
→
D203
→
C105
When the electric potential difference between the base and emitter of Q206 becomes less than about 0.3V, Q206 and Q102
and PC102 turn off, then the IC501 pin 153 (Digital Board) becomes a high level.
In this condition, if a telephone connected in parallel goes into OFF-hook status, the base of Q206 becomes low.
On the other hand, the emitter of Q206 goes down because the capacitor (C105) is charged. Q206 turns on when the electric
potential difference between the base and emitter of Q206 becomes more than 0.6 V while being charged.
When Q206 turns on, Q102 and PC102 also turn on, then the IC501 pin 153 (Digital Board) becomes a low level.
181
KX-FP121AL / KX-FM131AL
Содержание KX-FP121AL
Страница 3: ...15 8 FIXTURES AND TOOLS 231 3 KX FP121AL KX FM131AL ...
Страница 9: ...1 11 ITU T No 1 Test Chart 9 KX FP121AL KX FM131AL ...
Страница 11: ...1 12 2 CONTROL PANEL 11 KX FP121AL KX FM131AL ...
Страница 13: ...1 13 1 Connecting to a computer KX FM131 ONLY 13 KX FP121AL KX FM131AL ...
Страница 18: ...1 14 7 ADDING PAPER TO THE PAPER TRAY 1 14 8 DOCUMENTS THE UNIT CAN FEED 18 KX FP121AL KX FM131AL ...
Страница 21: ...1 14 12 REPLACING THE FILM CARTRIDGE 21 KX FP121AL KX FM131AL ...
Страница 22: ...22 KX FP121AL KX FM131AL ...
Страница 29: ...Note The explanations given in the are for servicemen only 29 KX FP121AL KX FM131AL ...
Страница 33: ...2 3 3 TROUBLESHOOTING ITEMS TABLE 33 KX FP121AL KX FM131AL ...
Страница 34: ...2 3 3 1 Simple Check List 34 KX FP121AL KX FM131AL ...
Страница 36: ...2 Document JAM 36 KX FP121AL KX FM131AL ...
Страница 40: ...6 Paper JAM 7 Multiple feed and skew 40 KX FP121AL KX FM131AL ...
Страница 43: ...Fig C 12 A blank page is received 43 KX FP121AL KX FM131AL ...
Страница 47: ...2 3 3 3 1 Defective facsimile section 1 Transmit problem 47 KX FP121AL KX FM131AL ...
Страница 55: ...55 KX FP121AL KX FM131AL ...
Страница 56: ...56 KX FP121AL KX FM131AL ...
Страница 57: ...57 KX FP121AL KX FM131AL ...
Страница 58: ...58 KX FP121AL KX FM131AL ...
Страница 59: ...59 KX FP121AL KX FM131AL ...
Страница 60: ...60 KX FP121AL KX FM131AL ...
Страница 61: ...61 KX FP121AL KX FM131AL ...
Страница 62: ...62 KX FP121AL KX FM131AL ...
Страница 70: ...I O and Pin No Diagram 70 KX FP121AL KX FM131AL ...
Страница 72: ...72 KX FP121AL KX FM131AL ...
Страница 74: ...NG Example 74 KX FP121AL KX FM131AL ...
Страница 75: ...2 3 3 4 2 Check the Status of the Digital Board 75 KX FP121AL KX FM131AL ...
Страница 76: ...2 3 3 4 3 RS 232C serial communication KX FM131 only 76 KX FP121AL KX FM131AL ...
Страница 77: ...77 KX FP121AL KX FM131AL ...
Страница 80: ...Note Inside the digital board 80 KX FP121AL KX FM131AL ...
Страница 83: ...Refer to 2 3 3 5 Analog Board Section 83 KX FP121AL KX FM131AL ...
Страница 85: ...2 Troubleshooting Flow Chart 85 KX FP121AL KX FM131AL ...
Страница 87: ...2 3 3 7 Operation Panel Section 1 No key operation 2 No LCD indication 87 KX FP121AL KX FM131AL ...
Страница 90: ...2 3 3 9 CIS Contact Image Sensor Section Refer to 6 4 4 SCANNING BLOCK 90 KX FP121AL KX FM131AL ...
Страница 91: ...91 KX FP121AL KX FM131AL ...
Страница 92: ...2 3 3 10 Thermal Head Section Refer to 6 4 3 THERMAL HEAD 92 KX FP121AL KX FM131AL ...
Страница 93: ...2 3 3 11 PANA LINK 93 KX FP121AL KX FM131AL ...
Страница 94: ...94 KX FP121AL KX FM131AL ...
Страница 95: ...95 KX FP121AL KX FM131AL ...
Страница 96: ...96 KX FP121AL KX FM131AL ...
Страница 97: ...97 KX FP121AL KX FM131AL ...
Страница 100: ...100 KX FP121AL KX FM131AL ...
Страница 114: ...2 4 7 3 PRINTOUT EXAMPLE 114 KX FP121AL KX FM131AL ...
Страница 115: ...115 KX FP121AL KX FM131AL ...
Страница 118: ...2 5 3 PRINT TEST PATTERN 1 Platen roller Reference pattern 118 KX FP121AL KX FM131AL ...
Страница 119: ...2 Left margin Top margin Reference pattern 119 KX FP121AL KX FM131AL ...
Страница 120: ...3 Thermal head 1 dot Reference pattern 120 KX FP121AL KX FM131AL ...
Страница 143: ...6 3 2 MEMORY MAP 143 KX FP121AL KX FM131AL ...
Страница 155: ...155 KX FP121AL KX FM131AL ...
Страница 165: ...6 4 6 3 2 Transmitting documents 6 4 6 3 3 Receiving FAX 165 KX FP121AL KX FM131AL ...
Страница 166: ...6 4 6 3 4 Copying 166 KX FP121AL KX FM131AL ...
Страница 176: ...b Redundancy Compression Process Coding Mode This unit uses one dimensional MH format 176 KX FP121AL KX FM131AL ...
Страница 184: ...184 KX FP121AL KX FM131AL ...
Страница 190: ...190 KX FP121AL KX FM131AL ...
Страница 204: ...9 6 MEMO KX FP121AL KX FM131AL 204 ...
Страница 205: ...10 TERMINAL GUIDE OF THE IC S TRANSISTORS AND DIODES 205 KX FP121AL KX FM131AL ...
Страница 206: ...11 FIXTURES AND TOOLS 206 KX FP121AL KX FM131AL ...
Страница 207: ...12 CABINET MECHANICAL AND ELECTRICAL PARTS LOCATION 12 1 OPERATION PANEL SECTION 207 KX FP121AL KX FM131AL ...
Страница 208: ...12 2 UPPER CABINET SECTION 208 KX FP121AL KX FM131AL ...
Страница 209: ...12 2 1 PICK UP BASE SECTION 209 KX FP121AL KX FM131AL ...
Страница 210: ...12 3 LOWER CABINET P C B SECTION 210 KX FP121AL KX FM131AL ...
Страница 211: ...12 4 MOTOR SECTION 211 KX FP121AL KX FM131AL ...
Страница 212: ...12 5 ACTUAL SIZE OF SCREWS AND WASHER 212 KX FP121AL KX FM131AL ...
Страница 213: ...13 ACCESSORIES AND PACKING MATERIALS 213 KX FP121AL KX FM131AL ...