- The receiving signal flows:
TEL line POS101 Q101 C113 R125 C108 Q109
Q405 Q406 Speaker
- The transmission signal flows
Mic Q421 Q424 C435 R437 Q108 Pos101 Tel Line
13.5. Tone Detect
This circuit is used to sense the status of the line (busy tone or dial tone) during Auto Redial.
13.5.1. Circuit operation
D101 Q101 C201 R201 R205 Pin 5 of IC201 Pin 1 of IC201 D202 R208
Q201
When the subscriber hangs-up, check the intermittent tone. If cycle tone is detected, the
collector of Q201 goes to a low logic.
26
Содержание KM40108849C3
Страница 3: ...1 LOCATION OF CONTROLS 2 DISPLAY 3...
Страница 15: ...6 DISASSEMBLY INSTRUCTIONS 15...
Страница 18: ...8 2 Speakerphone IC Data 18...
Страница 21: ...10 BLOCK DIAGRAM 11 BLOCK DIAGRAM IC 1 21...
Страница 22: ...11 1 Communication ICs 12 MODULE BLOCK DIAGRAM 12 1 MODULE BLOCK DIAGRAM 22...
Страница 28: ...28...
Страница 30: ...14 4 No Ringing Sound When Ring Signal is Input 30...
Страница 31: ...15 CABINET AND ELECTRICAL PARTS LOCATION 31...
Страница 32: ...32...
Страница 44: ...E C B E C B E C B E C B B C E B C E B C E IC601 IC903...