Installation
The Transmitter
AC Power Supply C Power Supply
Warning If a power supply fails, the input capacitor might still be charged
at a high voltage (up to 400 volts). ▲
Caution Do not remove the four screws that secure the power supply to
the mounting bracket. The power supply and mounting bracket are placed
as a single unit. ▲
Note The old power supply assembly is not field repairable. ▲
1. Follow the procedure in step 3 above to remove all other transmitter
boards (CPU, PCB 1, PCB 2, PCB 3, and PCB 4).
2. Remove the two hold-down screws from the base of the power supply
mounting bracket. These screws secure the power supply mounting
bracket to the main board.
3. Disconnect cables from the power supply (AC, DC, and Protective
Safety Ground). Cut the tie wrap that secures the toroid to the power
supply.
4. If replacing the power supply, remove the existing power supply and
mounting bracket assembly. Replace it with the new supply.
5. Connect the cables to the replacement power supply (see “Power to the
Transmitter” in Chapter 4 for wiring instructions).
6. Tighten the two hold-down screws to secure the power supply to the
main board. (A screw-holding screwdriver facilitates installation.)
7. Reinstall the transmitter boards.
3-6 DensityPRO+ Installation Guide Thermo Fisher Scientific
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