Lucent Technologies MERLIN LEGEND Release 5.0 Maintenance And Troubleshooting Manual page 95

MERLIN LEGEND Communications System Release 5.0
Maintenance and Troubleshooting 555-650-140
Control Unit Problems
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''
determine which 012 module is installed.
NOTE:
All 016 modules contain built-in ring generators.
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
throughout the procedure.
Follow Steps 1–4 in

chapter, to remove the power supply. Then return to Step 2 below.
Place the power supply on its left side and remove the five screws.

Carefully turn the power supply over on its right side and then

remove the top of the power supply housing.
Detach the cables from the inside edge of the plastic housing by

removing them from the clips.
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.
later in this chapter. See
PEC App. Code
61494 517G13 (28) or higher letter
61487 517E13 or
517F13 or lower letter
''Replacing the Power
June 1997
Page 4-5
Table 4-1 below to
Figure 4-2
Supply'', later in this
Issue 1