YamaT-san (Remote), Washimi-san, Yokozawa-san, Nakagaki-san, Ikeda

We have performed recovery work on K1MCF0.

Summary

First, We tried turning on the RTPC, and it booted up normally.
The key difference from the previous K-Log #33397 is as follows:
　We turned off the amplifier (KM750) before powering on the RTPC.

Details

Status before starting work:

IO chassis power was ON.
RTPC was powered OFF, and both the HIB cable and USB keyboard were disconnected.
The PEM amplifier power was ON.

Work was carried out in the following steps:
1. Requested the PEM team to check the cable connections, and no issues were found.
2. The PEM team turned off the amplifier (KM750).
3. Reconnected the cables that had been removed during the previous test:
 Connected the RTPC's HIB cable and USB keyboard.
4. Turned on the RTPC power.
5. After startup, confirmed via dmesg that the RTPC recognized cards such as ADC/DAC.
6. Turned the amplifier power back on (which was turned off in step 2).
7. Tidied up the shaker cables.
8. Performed an injection test using the speaker.
9. Performed an injection test using the shaker.

No issues occurred in any of the above steps.

Next Plan

For now, we will leave the system as it is and monitor it.

If a similar issue occurs in the future and cannot be resolved using the standard recovery procedure, we will test whether powering off the amplifier resolves the issue.
　If the system recovers just by turning off the amplifier, there may be a grounding issue on the amplifier side.

If that doesn’t help, we will consider replacing the HIB card or taking other measures.