Summary:
Sometimes, there is some issue related to the Quantum Power cycle. Here describe the behavior and the solution in this doc. Here is also the SPEC of the power supply working mechanism.

Solution:

1. There are three key lines of the CPS for the backplane power supply: VCC， PWRRESL，POKH；
2. The CPS shall monitor the VCC of backplane power supply. If VCC>7V, the CPS will protect itself, the CPS will be locked even thought the short circuit is removed. Power cycle is the only way to resume the CPS；
3. The CPS shall monitor the VCC of backplane power supply. If over current is more than 10 seconds, the CPS will protect itself, the CPS will be locked even thought the short circuit is removed. Power cycle is the only way to resume the CPS；
4. The “Reset” line is pulled down to  ground, “Pwr ok”of CPS’s LED is ON，CPU LCD keep the display and locked，Keyboard and communication are disabled, CPU is frozen; IO “Active” LED is off，the “F” of different IO module had different behavior, ON or OFF; power cycle the CPS, LCD is as following screen. The humid environment is over range with cause the “Reset” pulled down to ground. User can replace the CPU to another backplane to test, if the “Reset” is released, the CPU can be resumed without power cycle;
5. The “Power_OK” line is pulled down to  ground, “Pwr ok”of CPS’s LED is OFF，CPU LCD keep the display and locked，Keyboard and communication are disabled, CPU is frozen; IO “Active” LED is off，the “F” of different IO module had different behavior, ON or OFF; power cycle the CPS, LCD is as previous screen. The humid environment is over range with cause the “Power_OK” pulled down to ground. User can replace the CPU to another backplane to test, if the “Reset” is released, the CPU can be resumed without power cycle;

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