Power Supply Status - IBM 7012 G Series Service Manual

Power Supply Status

In 7012 G Series models, if the system detects a power supply failure on the base unit or
MCA expansion unit, it turns the power off and displays SRN 409-Axy, where xy is the
hexadecimal value of the power status register and gives some information on the power
fault, as described in this MAP.
If the power fault condition occurs on the disk expansion unit, while the system is running,
the system may detect the fault and log the error; however, if a reboot is launched, the
system will recognize the power fault and display 409-Axy SRN.
Line two of the operator panel display identifies the unit that contains the error. Units are
numbered as:
0
1
Step 1
You may be directed to this MAP for several reasons:
1. SRN 409-Axy 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 9.
2. The power button has been pressed (set to on), but the power does not stay on; no
information remains displayed on the operator panel display.
Go to step 2.
Step 2
(from Step 1)
1. Set the power button on the system unit to Off.
2. Unplug the system from the electrical outlet.
3. Set the key mode switch to the Service position.
4. Plug the system into the electrical outlet.
Is anything (even a blinking cursor) displayed in the operator panel display?
NO
YES
3-1520-2
Service Guide
Base System unit
Expansion unit
Go to Step 3
Go to Step 7