Technical Product Manual - DCT1900Maintenance, Part ReplacementMaint-DCT1900/R8/mw 5-1© 2000-2005CHAPTER 5Part Replacement5.1 General Rulesz Always protect yourself with a properly connected ESD wrist–strap before touching any board.z Pack replaced boards immediately in ESD safe material. Use the packing materials from thereplacement board.z When sending a board in for repair, always include a printout of the corresponding fault reportfrom the service table. If possible also include prints of info, fault and reset tables. Return theboard together with a completed "RMA Form" (ask your service manager or distributor).z Please observe that some CSMW software commands used in this chapter require adistributor privilege level.5.2 Replacing a System BoardAll system boards, except the CPU, use the same board replacement procedure. There is no needto 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 theReplace command. 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 "youcan now replace the board," the board is set free.Procedure1. Select Board in Radio Exchange window by left clicking on the listed board.2. Right click and select Replace or choose Board-Replace from the menu bar.3. Choose if you want to wait for calls to terminate before execution.4. Wait until the message "you can now replace the board" appears on the PC screen5. Disconnect cables from board (mark their position!).6. Remove the board.7. Insert the new board in exactly the same position.8. Re–connect cables.9. Put the defective board in ESD bag and box.After insertion, the board will start its board–power–on test. After the test is finished, the board willbe taken into service automatically.5.3 Replacing the CPUIf possible, back–up the contents of the EEPROM to the PC by selecting 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 System Manager–Control–Replace board command for allSPU and SLU boards starting at the board with the highest board number. When the last board"can be replaced," exit the CSMW software program. Also, let the users know that the system willbe out-of-service before removing the CPU.