Product manual

Maintenance, Part replacement
Technical Product Manual - DCT1800-GAP
TD 92093 (1/LZBNB 103 108 R4D) / 2006-03-09/ Ver.C
© 2006
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Chapter 5 Part replacement
5.1 General rules
• Always protect yourself with a properly connected ESD wrist-strap, before touching any board.
• Pack replaced boards immediately in ESD safe material. Use the packing materials from the
replacement board.
• When sending a board for repair, always include a printout of the corresponding fault report from
service table. If possible also include prints of info, fault and reset tables. Return the board together
with a completed ‘Standard repair form’ (ask your service manager or distributor).
5.2 Replacing a system board
All system boards, except the CPU, use the same board replacement procedure. There is no need to
switch off the system when replacing boards, except for the CPU.
Before replacing a faulty system board, the board must be set free from traffic. This is done by the
command Board-Replace. No new traffic is accepted, while existing calls can be terminated normally.
These busy circuits will be blocked immediately after the call has ended. After the message ‘you may
now replace the board’, the board is set free.
Procedure
1. Look in the fault report for the board address (cabinet plus board position number).
2. Execute (in System manager mode) the command Board-Replace.
3. Wait until the system is ready for replacing the board (a relevant pop-up window in CSM windows
appears)
4. Disconnect cables from board (mark their position!).
5. Remove board.
6. Insert the new board in exactly the same position.
7. Re-connect cables.
After insertion, the board will start its board-power-on test. After the test is finished, the board will be
taken into service automatically.
5.3 Replacing the CPU
If possible, back-up of the contents of the EEPROM to PC using the command File-System Backup.
The most ‘elegant’ procedure is to make the system free of traffic before replacing the CPU board.
This can be done by executing the command Board-Replace for all SPU, SPU-S and SLU boards
starting at the board with the highest board number. When the last board ’may be replaced’, exit the
cordless system manager program.
Procedure
1. Switch off the system.
2. Disconnect cables of CPU.
3. Replace CPU and re-connect cables.