AT&T 3.0 manual PEC and Apparatus Codes for 012 Modules, App. Code

Power Supply Problems

Current 012 modules contain built-in ring generators [apparatus code 517G13

(28)or higher letter]. If tip/ring devices connected to a newer module do not ring, see “Module Problems” later in this chapter. See Table 4–1 below to determine which 012 module is installed.

Table 4-1. PEC and Apparatus Codes for 012 Modules

012 Module	PEC	App. Code
with Ring Generator	61494	517G13 (28) or higher letter
Basic Telephone	61487	517E13 or
(without ring generator)		517FI 3 or lower letter

WARNING:

Hazardous electrical voltages may be present if the following steps are not performed correctly.

To replace the ring generator, follow the steps below. Refer to Figure 4-2throughout the procedure.

1Follow Steps 14 in “Replacing the Power Supply,” later in this chapter, to remove the power supply. Then return to Step 2 below.

2Place the power supply on its left side and remove the five screws.

3Carefully turn the power supply over on its right side and then remove the top of the power supply housing.

4Detach the cables from the inside edge of the plastic housing by removing them from the clips.

5Disconnect the 4-pin cable from the header labeled P202 on the left side of the power supply circuit board.

You may need to pry back the clip to free the cable.

6Disconnect the other cable from the header labeled P101 on the right side of the power supply circuit board.

You need to grip this cable firmly and pull forcefully.

Control Unit Problems 4-5