25.5. CIRCUIT OPERATION
25.5.1. CO Interface Circuit
25.5.1.1. Composition
This is composed of the following circuit:
1) Bell signal detection
2) DC loop formation circuit
3) Pulse dial transmission circuit
4) CALL ID interface circuit
5) COL bidirectional amplifier circuit
1) Bell signal detection
When CO line is idle, photo coupler PC1, PC2 are OFF.
When there is an incoming signal from CO line, the current flows PC1 as in the following way.
Tip
→
L1
→
R2
→
PC1(1-2)
→
C3
→
T2
→
R5
→
L1
→
Ring: This cause pin4 of PC1 to change the level from High to low.
Ring
→
L1
→
R5
→
T2
→
C3
→
PC2(1-2)
→
R2
→
L1
→
Tip: This cause pin4 of PC2 to change the level from High to low.
173
KX-TES824LA / KX-TEM824LA /
Summary of Contents for KX-A227X
Page 6: ...1 2 HOW TO RECOGNIZE THAT Pb FREE SOLDER IS USED 6 KX TES824LA KX TEM824LA ...
Page 12: ...6 NAMES AND LOCATIONS 7 CONNECTION 7 1 SERIAL INTERFACE CONNECTION 12 KX TES824LA KX TEM824LA ...
Page 28: ...28 KX TES824LA KX TEM824LA ...
Page 43: ...12 2 NO DIAL TONE KX TES824LA MAIN BOARD OF KX TEM824LA 43 KX TES824LA KX TEM824LA ...
Page 44: ...12 3 CANNOT DIAL KX TES824LA MAIN BOARD OF KX TEM824LA 44 KX TES824LA KX TEM824LA ...
Page 55: ...14 TERMINAL GUIDE OF ICS TRANSISTORS AND DIODES 55 KX TES824LA KX TEM824LA ...
Page 57: ...16 FIXTURES AND TOOLS 57 KX TES824LA KX TEM824LA ...
Page 58: ...17 CABINET AND ELECTRICAL PARTS LOCATION 58 KX TES824LA KX TEM824LA ...
Page 59: ...18 ACCESSORIES AND PACKING MATERIALS 59 KX TES824LA KX TEM824LA ...
Page 79: ...79 KX TES824LA KX TEM824LA ...
Page 111: ...21 7 1 WAVEFORM 111 KX TES824LA KX TEM824LA ...
Page 112: ...112 KX TES824LA KX TEM824LA ...
Page 113: ...21 7 2 Memo 113 KX TES824LA KX TEM824LA ...
Page 119: ...23 KX TE82461X 4 PORT DOORPHONE CARD 119 KX TES824LA KX TEM824LA ...
Page 120: ...23 1 HOW TO RECOGNIZE THAT Pb FREE SOLDER IS USED 120 KX TES824LA KX TEM824LA ...
Page 123: ...123 KX TES824LA KX TEM824LA ...
Page 127: ...23 7 TERMINAL GUIDE OF ICS TRANSISTORS AND DIODES 127 KX TES824LA KX TEM824LA ...
Page 128: ...23 8 ACCESSORIES AND PACKING MATERIALS 128 KX TES824LA KX TEM824LA ...
Page 135: ...24 KX TE82474X 8 PORT SLT EXTENSION CARD 135 KX TES824LA KX TEM824LA ...
Page 136: ...24 1 HOW TO RECOGNIZE THAT Pb FREE SOLDER IS USED 136 KX TES824LA KX TEM824LA ...
Page 142: ...142 KX TES824LA KX TEM824LA ...
Page 143: ...143 KX TES824LA KX TEM824LA ...
Page 147: ...24 5 TROUBLESHOOTING GUIDE 24 5 1 No Dial Tone 24 5 2 Cannot Dial 147 KX TES824LA KX TEM824LA ...
Page 148: ...24 5 3 Cannot Call Extension 148 KX TES824LA KX TEM824LA ...
Page 157: ...24 12 MEMO 157 KX TES824LA KX TEM824LA ...
Page 167: ...25 1 HOW TO RECOGNIZE THAT Pb FREE SOLDER IS USED 167 KX TES824LA KX TEM824LA ...
Page 178: ...178 KX TES824LA KX TEM824LA ...
Page 179: ...179 KX TES824LA KX TEM824LA ...
Page 183: ...25 6 TROUBLESHOOTING GUIDE 25 6 1 No Dial Tone 25 6 2 Cannot Dial 183 KX TES824LA KX TEM824LA ...
Page 207: ...26 1 HOW TO RECOGNIZE THAT Pb FREE SOLDER IS USED 207 KX TES824LA KX TEM824LA ...
Page 216: ...216 KX TES824LA KX TEM824LA ...
Page 217: ...217 KX TES824LA KX TEM824LA ...
Page 222: ...26 6 TROUBLESHOOTING GUIDE 26 6 1 No Dial Tone 26 6 2 Cannot Dial 222 KX TES824LA KX TEM824LA ...
Page 227: ...26 8 TERMINAL GUIDE OF ICS TRANSISTORS AND DIODES 227 KX TES824LA KX TEM824LA ...
Page 248: ...27 KX TE82491X MESSAGE EXTENSION CARD FOR DISA UCD OGMs 248 KX TES824LA KX TEM824LA ...
Page 249: ...27 1 HOW TO RECOGNIZE THAT Pb FREE SOLDER IS USED 249 KX TES824LA KX TEM824LA ...
Page 259: ...28 KX TE82492X 2 CHANNEL VOICE MESSAGE CARD 259 KX TES824LA KX TEM824LA ...
Page 260: ...28 1 HOW TO RECOGNIZE THAT Pb FREE SOLDER IS USED 260 KX TES824LA KX TEM824LA ...
Page 264: ...28 5 TROUBLESHOOTING GUIDE 28 5 1 PBX cannot work 264 KX TES824LA KX TEM824LA ...
Page 265: ...28 5 2 Cannot Erase 28 5 3 Cannot Record Playback 265 KX TES824LA KX TEM824LA ...
Page 273: ...29 KX TE82493X 3 PORT CALLER ID CARD 273 KX TES824LA KX TEM824LA ...
Page 274: ...29 1 HOW TO RECOGNIZE THAT Pb FREE SOLDER IS USED 274 KX TES824LA KX TEM824LA ...
Page 287: ...30 KX A227X BACK UP BATTERY CABLE 287 KX TES824LA KX TEM824LA ...
Page 288: ...30 1 ACCESSORIES AND PACKING MATERIALS 288 KX TES824LA KX TEM824LA ...