After remotely rebooting h1seiey and seeing that the 4th ADC is now completely absent from the PCI bus, the next test was a power cycle of the IO Chassis.

Procedure was:

Stop h1seiey models, fence from Dolphin and power down the computer.

Dave (@EY):

power down the IO Chassis (front switch, then rear switch)

Power down the 16bit-DAC AI Chassis (prevent overvoltage when IO Chassis is power up)

Power up the IO Chassis (rear switch, then front switch).

The chassis did not power up. Tracking it back, the +24V-DC power strip was unpowered, the laser interlock chassis which is also plugged into this was powered down. This tripped all the lasers.

Fil came out to EY with a spare ADC

Dave & Fil (@EY):

We opened the IO Chassis and removed the 4th ADC. With this slot empty Fil powered up the DC power supply with the IO Chassis on, it did not trip.

We powered down the IO Chassis to install a new ADC. We are skipping the slot the old ADC was in, because it could be a bad slot.

The second DAC was moved from A2-slot4 to A3-slot1, the new ADC was installed in A2-slot4, leaving the suspect A2-slot3 empty.

We powered the IO Chassis on with no problems, then we powered up the h1seiey computer. The models started with no issues, I was able to reset the SWWD.

The chassis was buttoned up, pushed into the rack, and the AI Chassis were powered back up.

Marc is fixing a cracked cap on the old ADC so we can test it offline.

ADCs: