4.0 Installing The DXPT1 Board
1. Normally you should disconnect the AC power cord from the AC outlet and disconnect the optional battery
back-up assembly from the main cabinet power supply; however, when necessary, you can install a DID line
board in an operating system. If you must do this, connect one end of a standard telephone handset coil cord
to the precharge port on the power supply. During step 6, you will connect the other end of this coil cord to
the precharge jack on the line board.
2. Install your static discharge wrist strap on your bare wrist; adjust it for a snug fit. Be sure that the strap is
touching bare skin and is not isolated by clothing. Connect the wrist strap cord between the wrist strap and an
AC or earth ground
3. Loosen the retaining hardware and lift the front panel away from the common equipment cabinet.
NOTE: With the common equipment in the installed position, the ground lug on the side of the cabinet is an
appropriate grounding point since it should have a heavy ground wire connected between it and a good
earth ground.
4. Each DXPT1 line board is supplied in a static protection bag for safe keeping. When you are ready to install
the board, remove it from its static protection bag.
5. Locate the proper board slot.
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On DXP Plus systems the DXPT1 line boards connect to any universal slot.
NOTE: On DXP Plus systems, do not install a DXPT1 line board at the right-most board slot in the second (or
lower) expansion cabinet. The system reserves this slot for internal use.
6. If you are installing the DXPT1 line board in an operating system, connect the free end of the precharge cord
that you installed in step 1 to the precharge jack on the line board.
7. Orient the DXPT1 line board with its top and bottom guides in main cabinet board cage, and press the board
firmly until its board edge connection properly mates with the connector on cabinet’s backplane. If you
connected a handset cord between the pre-charge port on DXP Plus power supply and the jack on DXPT1 line
board (as directed in step 6), disconnect it after installing board.
CAUTION
When pressing circuit boards into place, press them only at the extractor lever locations.
If you apply pressure at other locations you may damage the board assembly.
8. Repeat steps 3 and 4 until all DXPT1 line boards are installed.
9. Make a final inspection to ensure that all boards are, oriented correctly and mated properly.
10. Install and tighten the supplied screws to secure the circuit boards to the board cage. Do not neglect this step!
It is important because it helps in providing a protective ground condition for the board thus ensuring RFI
(radio frequency interference) and lightning protection.
IMI89–193
Installing The DXPT1 Line Board
10 – Installing The DXPT1 Line Board