KX-TS550MEB / KX-TS550MEW Note for TABLE OF CONTENTS: Because sections 5, 6 and 7 of this manual are extracts from the operating instructions for this model, they are subject to change without notice. You can download and refer to the original operating instructions on TSN Server for further information.
KX-TS550MEB / KX-TS550MEW 1 ABOUT LEAD FREE SOLDER (PbF: Pb free) Note: Caution • PbF solder has a melting point that is 50°F ~ 70° F In the information below, Pb, the symbol for lead in the (30°C ~ 40°C) higher than Pb solder. Please use a...
KX-TS550MEB / KX-TS550MEW 2 FOR SERVICE TECHNICIANS • Repair service shall be provided in accordance with repair technology information such as service manual so as to prevent fires, injury or electric shock, which can be caused by improper repair work.
KX-TS550MEB / KX-TS550MEW 6 OPERATIONS 6.1. Making Calls 6.2. Answering Calls 7 SPECIAL FEATURES 7.1. For Call Waiting Service Users 7.2. Temporary Tone Dialing (For Rotary or Pulse Service Users)
KX-TS550MEB / KX-TS550MEW 9 TROUBLE SHOOTING GUIDE 9.1. Service Hints SYMPTOM CURE No Tone Dialing Check IC1, Q2, Q1, C22 and VR1. Dead Check IC1, Q2, Q1 and D17. Rings, no dial tone, no pulse or tone dial Check Q1, Q2, Q7, D17 and Q3.
KX-TS550MEB / KX-TS550MEW 12 CIRCUIT OPERATIONS 12.1. Telephone Line Interface and Pulse Dial Circuit When the hook switch SW1 is ON (off-hook), the circuit is closed, and current is supplied to the base of Q2 via the diode bridge D17 and Q2 is On → Q1 is ON (OFF-HOOK condition).
KX-TS550MEB / KX-TS550MEW 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).
KX-TS550MEB / KX-TS550MEW 18 FOR SCHEMATIC DIAGRAM 1. DC voltage measurements are taken with electronic voltmeter from negative terminal. 2. This schematic diagram may be modified at any time with the development of new technology. Important Safety Notice: Components identified by mark have special characteristics important for safety.