7.8.5. LINE AMPLIFIER AND SIDE TONE CIRCUITS
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 (KX-FPC135), 10dB (KX-FPC141).
The transmission signal goes through C131 and R137 and enters IC101-pin (2), where the signal is amplified to about 18dB
(KX-FPC135), 16.5dB (KX-FPC141). Then, it is output from pin (1) of IC101 and transmitted to T101 via C133 and R125. If the
side tone circuit is not applied, the transmission signal will return to the reception amplifier via C126 and R131. When the side
tone circuit is active, the signal output from IC101 pin (1) passes through C133, R128, R129, C124, C123 and R127 and goes
into the amplifier IC101 pin (5). This circuit is used to cancel the transmission return signal.
7.8.6. AUTO DISCONNECT CIRCUIT (KX-FPC141 only)
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.
2. Circuit Operation
If the line is picked up, C104 is charged by the following path shown below.
Tip (Ring)
→
D101
→
R103
→
D102
→
R105
→
Q102
→
PC102
If a telephone connected in parallel goes into OFF-HOOK status, the base of Q102 becomes low and PC102 turns OFF.
When the line is connected, Q102 and PC102 turn on, then pin (153) of IC501 (ASIC) on the digital board becomes low. On
the other hand, When the line is disconnected, Q102 and PC102 turn off, then the pin (153) of IC501 (ASIC) becomes high.
7.8.7. CPC (Calling Party Control) DETECTION CIRCUIT (KX-FPC141 only)
1. Function
This circuit detects the signal (cuts the current ) output from the converter when the other party finishes ICM recording and goes
into the ON-HOOK status.
TAD detects this signal and disconnects the line. When the TAD is operating, pin (4) of PC104 becomes a low level.
While detecting the CPC signal, pin (4) of PC104 becomes a high level. When the CPC signal is detected, the TAD operation
stops and the line is disconnected.
190
KX-FPC135 / KX-FPC141
Summary of Contents for KX-FPC135
Page 10: ...1 11 CCITT No 1 Test Chart Actual size 10 KX FPC135 KX FPC141 ...
Page 12: ...1 12 2 LOCATION HANDSET KX FPC135 12 KX FPC135 KX FPC141 ...
Page 13: ...1 12 3 LOCATION HANDSET KX FPC141 13 KX FPC135 KX FPC141 ...
Page 14: ...1 12 4 CONTROL PANEL KX FPC135 Model KX FPC135 14 KX FPC135 KX FPC141 ...
Page 15: ...1 12 5 CONTROL PANEL KX FPC141 Model KX FPC141 15 KX FPC135 KX FPC141 ...
Page 37: ...2 3 3 TROUBLESHOOTING ITEMS TABLE 37 KX FPC135 KX FPC141 ...
Page 38: ...2 3 3 1 Simple Check List 38 KX FPC135 KX FPC141 ...
Page 40: ...2 Document JAM 40 KX FPC135 KX FPC141 ...
Page 44: ...6 Paper JAM 7 Multiple feed and skew 44 KX FPC135 KX FPC141 ...
Page 47: ...Fig C 12 A blank page is received 47 KX FPC135 KX FPC141 ...
Page 51: ...2 3 3 3 1 Defective facsimile section 1 Transmit problem 51 KX FPC135 KX FPC141 ...
Page 59: ...59 KX FPC135 KX FPC141 ...
Page 60: ...60 KX FPC135 KX FPC141 ...
Page 61: ...61 KX FPC135 KX FPC141 ...
Page 62: ...62 KX FPC135 KX FPC141 ...
Page 63: ...63 KX FPC135 KX FPC141 ...
Page 64: ...64 KX FPC135 KX FPC141 ...
Page 65: ...65 KX FPC135 KX FPC141 ...
Page 66: ...66 KX FPC135 KX FPC141 ...
Page 75: ...I O and Pin No Diagram 75 KX FPC135 KX FPC141 ...
Page 77: ...77 KX FPC135 KX FPC141 ...
Page 79: ...NG Example 79 KX FPC135 KX FPC141 ...
Page 80: ...2 3 3 4 3 Check the Status of the Digital Board 80 KX FPC135 KX FPC141 ...
Page 82: ...Note Inside the digital board 82 KX FPC135 KX FPC141 ...
Page 84: ...Note Inside the digital board 84 KX FPC135 KX FPC141 ...
Page 88: ... KX FPC141 only Refer to 2 3 3 5 Analog Board Section 88 KX FPC135 KX FPC141 ...
Page 90: ...2 Troubleshooting Flow Chart 90 KX FPC135 KX FPC141 ...
Page 92: ...2 3 3 8 Operation Panel Section 1 No key operation 2 No LCD indication 92 KX FPC135 KX FPC141 ...
Page 96: ...96 KX FPC135 KX FPC141 ...
Page 97: ...2 3 3 11 Thermal Head Section Refer to 6 4 3 THERMAL HEAD 97 KX FPC135 KX FPC141 ...
Page 100: ...2 3 3 12 8 No Link Base Unit TX 2 3 3 12 7 No Link Base Unit RX 100 KX FPC135 KX FPC141 ...
Page 114: ...2 4 7 3 PRINTOUT EXAMPLE 114 KX FPC135 KX FPC141 ...
Page 115: ...115 KX FPC135 KX FPC141 ...
Page 118: ...2 5 3 PRINT TEST PATTERN 1 Platen roller Reference pattern 118 KX FPC135 KX FPC141 ...
Page 119: ...2 Left margin Top margin Reference pattern 119 KX FPC135 KX FPC141 ...
Page 120: ...3 Thermal head 1 dot Reference pattern 120 KX FPC135 KX FPC141 ...
Page 126: ...126 KX FPC135 KX FPC141 ...
Page 129: ...3 13 Handset Reference Drawing 129 KX FPC135 KX FPC141 ...
Page 152: ...7 3 3 MEMORY MAP 152 KX FPC135 KX FPC141 ...
Page 164: ...164 KX FPC135 KX FPC141 ...
Page 174: ...7 4 6 3 2 Transmitting documents 7 4 6 3 3 Receiving FAX 174 KX FPC135 KX FPC141 ...
Page 175: ...7 4 6 3 4 Copying 175 KX FPC135 KX FPC141 ...
Page 192: ...192 KX FPC135 KX FPC141 ...
Page 200: ... Surge Absorber Circuit 200 KX FPC135 KX FPC141 ...
Page 208: ...9 4 CPU DATA 9 4 1 IC901 208 KX FPC135 KX FPC141 ...
Page 216: ...11 1 MEMO 216 KX FPC135 KX FPC141 ...
Page 222: ...KX FPC135 KX FPC141 222 ...
Page 224: ...KX FPC135 KX FPC141 224 ...
Page 226: ...KX FPC135 KX FPC141 226 ...
Page 234: ...KX FPC135 KX FPC141 234 ...
Page 237: ...22 TERMINAL GUIDE OF THE IC S TRANSISTORS AND DIODES 237 KX FPC135 KX FPC141 ...
Page 238: ...23 FIXTURES AND TOOLS 238 KX FPC135 KX FPC141 ...
Page 240: ...24 2 UPPER CABINET SECTION 240 KX FPC135 KX FPC141 ...
Page 241: ...24 2 1 PICK UP BASE SECTION 241 KX FPC135 KX FPC141 ...
Page 242: ...24 3 LOWER P C B SECTION 242 KX FPC135 KX FPC141 ...
Page 243: ...24 4 MOTOR SECTION 243 KX FPC135 KX FPC141 ...
Page 244: ...24 5 HANDSET SECTION 244 KX FPC135 KX FPC141 ...
Page 245: ...24 6 ACTUAL SIZE OF SCREWS AND WASHER 245 KX FPC135 KX FPC141 ...
Page 246: ...25 ACCESSORIES AND PACKING MATERIALS 246 KX FPC135 KX FPC141 ...
Page 264: ...264 KX FPC135 KX FPC141 D Q KXFPC135 KXFPC141 Printed in Japan ...