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If a power supply is not outputting DC power, 12 or 24VDC at the Power supply main board lower right terminals ( DC+ DC-), there are several potential causes. ·         Legacy Power Supplies (50...
The standard Von Duprin PS873 power supply was replaced by the PS914 power supply.
NOTE: The newer PS900 option cards can NOT be used in the PS873 power supplies. The PS873 option cards also can NOT be used in the newer PS900 series power supplies.
  Attached tables are power supply cross reference, power supply option board and power supply option board compatibility. PS900-Model PS900-Summar...
    PS900- Model PS900-Summary Legacy supply (PS873) 900-2RS 2 zone control with sequencing 871-2 b...
  Option Board Von Duprin PS914 Schlage PS902, PS904, PS906 900-2RS Yes No 900-2Q ...
The standard Von Duprin PS873 power supply was replaced by the PS914 power supply.
NOTE: The newer PS900 option cards can NOT be used in the PS873 power supplies. The PS873 option cards also can NOT be used in the newer PS900 series power supplies.
  Attached tables are power supply cross reference, power supply option board and power supply option board compatibility. PS900-Model PS900-Summar...
    PS900- Model PS900-Summary Legacy supply (PS873) 900-2RS 2 zone control with sequencing 871-2 b...
  Option Board Von Duprin PS914 Schlage PS902, PS904, PS906 900-2RS Yes No 900-2Q ...