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Power Supply Status
If the system detects a power supply failure in the CPU enclosure, it turns the power off and
displays service-request number (SRN) 409-Axy or 409-Bxy, where xy is the hexadecimal
value of the power status register and gives some information about the power fault, as
described in this MAP.
Step 1
You may be directed to this MAP for several reasons:
1. SRN 409-Axy or 409-Bxy appears on the operator panel display: a power fault has
been detected on some unit and the entire system has been powered off.
Go to Step 10.
2. The power button has been pressed (set to on) but does not stay on; no information
remains displayed on the operator panel display.
Go to step 2.
3. SRN 409-098 appears on the operator panel display. This SRN indicates that the front
access plate is not correctly closed or that the interlock switch on the front access plate
is defective. Check if the top cover is correctly closed and ,if it is not, close it properly,
following the procedure described earlier in this guide; otherwise, call your service
support person for assistance.
Step 2
(from Step 1)
1. Set the power button on the CPU Enclosure to Off.
2. Unplug both power supply power cords from both power distribution bus (PDB) outlet
power cords.
3. Set the key mode switch to the Service position.
4. Plug both power supply power cords into both PDB outlet power cords.
Is anything (even a blinking cursor) displayed in the operator panel display?
NO
YES
3-1520-2
Service Guide
Go to Step 3.
Go to Step 8.
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