GDAS-16 Power Supply Troubleshooting

This document defines more detailed troubleshooting information regarding the GDAS-16 power supplies. See GDAS-16 Theory Section 5, for other general information regarding power supply operation and block diagrams.

See Figure 1 for the block diagram that shows the power supply interconnects.

Figure 1. GDAS-16 Power supply block diagram

The GDAS-16 fuse box is just a single fuse and switch. This is the fuse that is spoken of for any subsequent troubleshooting actions.

notice The GDAS-16 center backplane may still have a 12V test point due to the desire to have common backplanes between MDAS and GDAS-16. The 12V test point is NOT used with a GDAS-16 so there will be no voltage seen at this test point.

The table below defines the dependencies between the two GDAS-16 power supplies regarding the potential failure modes and effects of those failure modes. This table should be used as a reference as to what system issues are seen, what should be checked and what the potential FRU replacement needs to be. This is just a guide as not all potential symptoms/actions can easily be covered.

Figure 2 below shows an overview of an isolation process for GDAS-16 power supply problems.

Figure 2. GDAS-16 Power Supply isolation process flowchart