Instruction manual

MERLIN LEGEND Communications System Release 5.0
Maintenance and Troubleshooting
555-650-140
Issue 1
June 1997
Control Unit Problems
Page 4-5
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.
NOTE:
All 016 modules contain built-in ring generators.
Table 4-1. PEC and Apparatus Codes for 012 Modules
!
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.
Follow Steps 1–4 in ‘‘Replacing the Power Supply’’, later in this
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.
012 Module PEC App. Code
with Ring Generator 61494 517G13 (28) or higher letter
Basic Telephone
(without ring generator)
61487 517E13 or
517F13 or lower letter