7.1. For Call Waiting Service Users 7.2. Temporary Tone Dialing (For Rotary or Pulse Service Users) 8 DISASSEMBLY INSTRUCTIONS 9 TROUBLE SHOOTING GUIDE 9.1. Service Hints.

When a dial key is pressed, a DTMF signal is output from Pin 25 of IC1 as an analog synthetic wave. The signal flow to the line is as follows. Pin 25 of IC1 → Q3 → R9 → Q1 → Tel Line. The DTMF signal is sent to the line via the fo.

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