AT&T 3.0 manual 6Control Unit Problems

Power Supply Problems

7 Remove the four screws from the ring generator, as shown in Figure 4-2.

8 Remove the ring generator.

9 Position the replacement ring generator, as shown in Figure 4-2.Align the screw holes.

Make sure the PI header on the ring generator is on the same side of the power supply housing as the P101 header on the circuit board.

10 Replace the four screws and fasten them to secure the ring generator.

11 Connect one end of the new ring generator’s cable with the 3-pin connectors to the header labeled P101 on the power supply circuit board.

This cable connector, as with all four of the cable connectors, is keyed so that you cannot attach it to the header if it is turned the wrong way.

12 Connect the other end of the cable to the header labeled P1 on the ring generator.

The cable headers, P1 and P101, should be on the same side of the housing, so that the cables are not crossing each other.

13 Connect one end of the new 4-pin cable to the header labeled P202 on the power supply circuit board.

14 Connect the other end of the cable to the header labeled P2 on the ring generator.

15 Attach the cables to the clips on the inside edge of the plastic housing.

16 Replace the top of the module housing.

Take time to ensure that the on/off faceplate on the front of the power supply housing is aligned and inside the top cover.

17 Carefully, taking time to make sure the on/off faceplate stays aligned, turn the module over and replace the five screws.

4-6Control Unit Problems