User's Manual

EX7100 Technical Manual - Module Descriptions
©1999 Exicom Technologies (1996) Ltd 7-68 Issue 3 - May 2001
7.13.4 Line Interface Replacement Procedure
This procedure covers the replacement of either Line Interface module.
Refer to Section 6.1 for the initial procedure then:
1. Remove the six screws that hold the Front Panel to the casting.
2. Remove the screw that retains the Isolated Power Supply module’s heat sink block.
3. Note the connector positions and the way that the cables are run (it is important that
all cables are replaced as they were initially run before the module replacement
procedure).
4. Remove PL1, PL2 and PL3 from the Isolated Power Supply module.
5. Remove the four screws that hold the Isolated Power Supply PCB. Lift the Isolated
Power Supply PCB clear of the casting. Keep all screws in a safe place.
6. Remove connections PL1 and PL902 from the Line Interface module. Remove the
grounding wire at the terminal casting lug.
7. Remove the four Isolated Power Supply threaded stand-offs and the five stand-offs
and two screws that retain the Line Interface PCB. Keep the fixings in a safe place.
8. Holding only the edges of the PCB, carefully lift the Line Interface module clear of the
terminal.
9. Carefully position the new Line Interface PCB into the casting, taking care not to flex
the PCB as this can cause damage to the surface mounted components. Replace the
four Isolated Power Supply threaded stand-offs and the five stand-offs and two
screws that hold the PCB into the casting.
10. Refit the Isolated Line Interface PSU module and replace the four screws that hold
the Isolated Power Supply PCB. (Note: The screw with the nylon washer must
be
fitted next to PL2 pin 1 on the Isolated Power Supply PCB). Tighten the four
mounting screws.
11. Refit the screw that holds the PSU heat sink block against the main casting.
12. Refit the Front Panel by reversing step 1. above
13. Re-connect all cables as removed in 4. and 6. above. Ensure that all
cables are run
as they were prior to removal.
14. Inspect the EX7100 terminal to ensure that it is free of foreign material. Remove and
clean as required.
15. Replace the top cover, taking care to tighten every screw. No screws should be left
over at the end of the job.
16. Re-install the EX7100 back into its rack and re-connect all necessary power,
signalling and antenna cabling.