22.3. Telephone Line Interface
<Function>
- Bell signal detection
- Clip signal detection
- ON/OFF hook circuit
- Audio circuits
Bell & Clip (: Calling Line Identification Presentation: Caller ID) signal detection:
In the standby mode, Q4 is open to cut the DC loop current and decrease the ring load.
When ring voltage appears at the TP21 (A) and TP19 (B) leads (when the telephone rings), the
signal is transferred as follows;
- B C12 R16 R32 IC2 Pin 112 (CID IN -)
- A C13 R17 R24 IC2 Pin 119 (CID IN +)
ON/OFF hook circuit:
In the standby mode, Q4 is open, and connected as to cut the DC loop current and to cut the
voice signal. The unit is consequently in an on-hook condition.
When IC2 detects a ring signal or press the TALK Key onto the handset, Q5 turns on and then Q4
turns on, thus providing an off-hook condition (active DC current flow through the circuit) and
the following signal flow is for the loop current.
- A D3 Q4 R34 Q8 R45 R46 D3 B [OFF HOOK]
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Summary of Contents for KX-TCD505HKM
Page 9: ...9 ...
Page 13: ...6 3 Settings Menu Chart 6 3 1 Base Unit 6 3 2 Handset 13 ...
Page 14: ...6 4 PIN Code 6 4 1 Base Unit 14 ...
Page 25: ...25 ...
Page 27: ...8 3 Redialling 27 ...
Page 29: ... To exit the operation press any time 8 4 2 Entering Names Characters 29 ...
Page 30: ...Cross Reference Phonebook Character Table 8 4 3 Phonebook Character Table 30 ...
Page 31: ...8 4 4 Storing the Number in the Phonebook 31 ...
Page 32: ...8 4 5 Hot Key Speed Dial 32 ...
Page 34: ...8 5 Handset Registration to a Base Unit 34 ...
Page 35: ...Note for Service At step 7 enter Finally Handset will be linked to Base Unit 35 ...
Page 36: ...8 6 Base Unit Selection 36 ...
Page 38: ...To exit the operation press at any time 9 2 Text Entry 38 ...
Page 39: ...Cross Reference SMS Character Table 39 ...
Page 40: ...9 3 SMS Character Table 40 ...
Page 41: ...9 4 Reading Displaying Messages 9 4 1 In the Outgoing List 41 ...
Page 42: ...9 4 2 In the Incoming List 42 ...
Page 43: ...43 ...
Page 51: ...51 ...
Page 52: ...Cross Reference Power Supply Circuit Reset Circuit Adjustment Base Unit 12 3 2 Handset 52 ...
Page 74: ...meter 2 Put the probes at the receiver terminals as shown below 74 ...
Page 81: ...27 CPU DATA BASE UNIT 27 1 IC2 BBIC 81 ...
Page 84: ...87 DAB5 D I O DAB5 I O H 84 ...
Page 86: ...128 AD7 D O AD6 O O I 28 CPU DATA HANDSET 28 1 IC1 BBIC 86 ...
Page 104: ...104 ...
Page 106: ...35 ACCESSORIES AND PACKING MATERIALS 106 ...
Page 107: ...35 1 KX TCD505HKM 35 2 KX TCA151EM 107 ...
Page 108: ...36 TERMINAL GUIDE OF THE ICs TRANSISTORS AND DIODES 36 1 Base Unit 108 ...
Page 124: ...IC3 IC2 IC1 IC10 PbF Marked ...
Page 126: ...PbF D1 J1 Marked PbF R1 R2 TP4 TP1 TP2 TP3 Marked Component View Flow Solder Side View ...
Page 130: ...PbF R1 R2 TP4 TP1 TP2 TP3 Digital Volt Meter 12Ω 2W A DC Power Supply 6V ...
Page 145: ...PbF D1 J1 CIRCUIT BOARD CHARGER UNIT Component View ...
Page 146: ...PbF R1 R2 TP4 TP1 TP2 TP3 CIRCUIT BOARD CHARGER UNIT Flow Solder Side View ...