APPARATUS AND METHOD FOR VISUAL FIELD REPLACEABLE UNIT IDENTIFICATION IN THE ABSENCE OF HOST SYSTEM DEVICE POWER

摘要

The present disclosure is directed to visual field replacement unit (FRU) identification and retaining FRU status information of one or more field replaceable units in a host system device when one or more of the field replaceable units is removed from the host system device disconnecting host power to the removed field replaceable unit(s). The one or more field replaceable units may be located on a carrier printed circuit board assembly and the host system device may contain multiple field replaceable units and/or multiple carrier printed circuit board subassemblies. Once the host power is disconnected from the carrier, an alternate power source continues to provide power to keep the FRU indicator illuminated for repairs or replacement. The FRU indicator is illuminated long enough for a service technician to place the carrier on a bench or table top and recognize the failed FRU from the remaining FRUs.

主权项

1. A device for visual field replacement unit identification, comprising:
a storage circuit, the storage circuit stores status bits indicating a status of each field replacement unit in a plurality of field replacement units; a power multiplexer/isolation circuit coupled to the storage circuit and a main power source for supplying power to the storage circuit during runtime updating the status of the each field replacement unit in the plurality of field replacement units; and an alternate power source coupled to the power multiplexer/isolation circuit to power the storage circuit when the storage circuit is disconnected from the main power source, wherein when activated for illumination, the alternate power source illuminates one or more indicators of one or more failed field replaceable units in the plurality of field replacement units.