IBM H Series Installation And Service Manual page 54

DANGER
To prevent electrical shock hazard, disconnect the power cord from the
electrical outlet before relocating the system.
CAUTION:
This system may have two power supplies installed. To reduce the risk of elec-
trical shock, disconnect both power supply cords before servicing.
Step 1520-1
You may be directed to this MAP for several reasons:
1. The power light on the operator panel is not flashing and the operator panel is
blank.
Go to "Step 1520-2" on page 2-21.
2. The power LED on the operator panel is flashing and the operator panel is blank.
Go to "Step 1520-3" on page 2-22.
3. OK, STBY or DIAG STBY is displayed on the operator panel. There is no indi-
cation of activity when the power button on the operator panel is pressed. None
of the power LEDs light and none of the fans, including the fan in the power
supply, start to turn.
Go to "Step 1520-3" on page 2-22.
4. OK, STBY or DIAG STBY is displayed on the operator panel and the power LED
on the operator panel is flashing. When the power button on the operator panel
is pressed, the system begins to power on, but the power LED on the operator
panel does not stay on.
Go to "Step 1520-3" on page 2-22.
5. A SRN referenced in the Diagnostic Information for Multiple Bus Systems listed
MAP 1520 in the "Actions/Descriptions" column for a Voltage Sensor out of
range.
Go to "Step 1520-10" on page 2-29.
2-20
RS/6000 Enterprise Server Model H Series Installation and Service Guide