WP 6314

Fil, Jim

In an attempt to stabilize the h1oaf0 ADC/DAC issue, Fil and Jim replaced the DC power supply in the h1oaf0 I/O chassis, and reseated all ADC, DAC, BIO, and interface cards in the chassis.  Start time 9:31, power up of I/O chassis at 9:55. The first attempt at starting the models resulted in ADC and DAC errors like we've seen, and the IRIG-B time going negative.  The models were killed, then restarted manually to watch for issues.  The models started OK on the second attempt.  

Note that the TCS AI chassis was powered down during this work, and was powered back up once the h1tcscs model was running.  We avoided tripping the TCS laser chillers.