This Sony PFV - SP3000 Signal Processing Unit comes without a redundant power supply. It includes a correct power supply for seamless operation. However, there are a couple of known issues. The power supply fan runs a bit louder than usual, and the top - left corner bracket on the front panel is loose.

To use this Sony PFV - SP3000 Signal Processing Unit, first, make sure to connect the provided correct power supply. Once it's powered on, you can start processing your signals. Just be aware that the fan might be a bit noisy, but it won't affect the unit's performance. When it comes to maintenance, keep the unit in a clean and dry place. Since the front - panel bracket is loose, try not to bump or shake the unit too much to avoid further damage. Also, regularly check the power supply to ensure it's working properly.