AT&T MERLIN LEGEND Release 3.0 Installation Manual page 383

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
with Ring Generator
Basic Telephone
(without ring generator)
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 4-2
throughout the procedure.
1 Follow Steps 14 in "Replacing the Power Supply," later in this chapter,
to remove the power supply. Then return to Step 2 below.
2 Place the power supply on its left side and remove the five screws.
3 Carefully turn the power supply over on its right side and then remove
the top of the power supply housing.
4 Detach the cables from the inside edge of the plastic housing by
removing them from the clips.
5 Disconnect 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.
6 Disconnect 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.
PEC App. Code
61494
517G13 (28) or higher letter
61487
517E13 or
517FI 3 or lower letter
Control Unit Problems 4-5