We figured out the reason that no DAC signal coming out from DAC1 (for TMSY coil outputs) was because of the IO chassis was a bad one
YamaT and I will replace the chassis itself on Monday. Please see the details (in Japanese) on the DGS blog.
[YamaT, Kokeyama]
We figured out that the adapter card of DAC1 was somehow bad. Now the EY0 DAC1 is properly working with a new adapter card.
The io chassis was replaced since we suspected it first. The original EY0 io chassis was returned to the mine server room.
- DAC signals (H1-3, V1-3) can be monitored on the output of AI chassis.
- DAC adapter was maybe bad. (I'll check it on the test bench system.)
* What we did
1. IO chassis Replacement.
We installed the used cards and cables in new IO chassis.
-> DACs did not work.
=> Motherboard was not bad.
2. Uninstallation of an old type of an ADC card.
A DAC worked well with 3 ADC and 1 DAC and DACs did not work with 3 ADC and 2 DAC on Sat.
We checked that a number of PCIe card was a cause or not.
-> DACs did not work with 2 ADC and 2 DAC.
=> Two DAC configuration was bad. (Maybe five PCIe cards configuration was not bad.)
3. A Swap of DAC internal cables.
We replaced the DAC internal cables with spare one.
-> DACs did not work (with 2 ADC and 2 DAC).
=> Internal cables were not a cause.
4. Replacement of a DAC adapter card
After the internal cable restore to original condition, we replaced a DAC adapter card.
-> DAC signals can be seen on the AI output ports.
=> A DAC adapter was a cause of this issue.
5. Installation of the 3rd ADC.
Finally, we reinstalled the 3rd ADC and checked DAC outputs again.
-> DAC worked well.
