12.3. Power Circuit and Redial Back-up Circuit
Function:
This set is powered from the line. When it is an OFF-HOOK status, Tel Line
→
D17
→
Q1
→
R9
→
Pin 27 of IC1 (to become
the power supply for IC1 speech network).
The voltage from the line is turned into a constant voltage by D2 and then supplied to the IC1, reset circuit.
Through Tel Line
→
R1
→
R3
→
D17
→
R14 to become the power supply for IC1, and the redial Back-up will be done.
17
KX-TS550MEB / KX-TS550MEW
Summary of Contents for KX-TS550MEB
Page 5: ...4 LOCATION OF CONTROLS 5 KX TS550MEB KX TS550MEW ...
Page 6: ...5 SETTINGS 5 1 Connection 6 KX TS550MEB KX TS550MEW ...
Page 10: ...9 3 Problems With the Handset 9 4 Tone Dialing Problems 10 KX TS550MEB KX TS550MEW ...
Page 11: ...9 5 Problems With Ringer 11 KX TS550MEB KX TS550MEW ...
Page 12: ...9 6 How to Check the IC1 Scanning to the key 12 KX TS550MEB KX TS550MEW ...
Page 16: ...16 KX TS550MEB KX TS550MEW ...
Page 19: ...19 KX TS550MEB KX TS550MEW ...
Page 20: ...14 CABINET AND ELECTRICAL PARTS LOCATION 20 KX TS550MEB KX TS550MEW ...
Page 21: ...15 ACCESSORY AND PACKING MATERIALS 21 KX TS550MEB KX TS550MEW ...
Page 22: ...16 TERMINAL GUIDE OF ICs TRANSISTORS AND DIODES 22 KX TS550MEB KX TS550MEW ...
