IBM 265, Service Manual

Page: 66 / 365

DANGER
To prevent electrical shock hazard, disconnect all power cables from the
electrical outlet before relocating the system.
Step 1520-1
Check the power supply ac LEDs, the green LED on the rear of the system unit and the
power LED on the operator panel.
Note: If the condition exists that three power supplies are present, but only two are
working, you can verify this situation through the service processor and a
warning-level EPOW.
You might have been directed to this MAP for several reasons:
v
The ac LEDs on the power supplies are not on, the green LED on the rear of the
system unit is not flashing and the operator panel is blank.
Go to “Step 1520-2” on page 51.
v
The ac LEDs on the power supplies are on, the green LED on the rear of the system
unit is not flashing and the operator panel is blank.
Go to “Step 1520-7” on page 53.
v
The ac LEDs on the power supplies are on, the green LED on the rear of the system
unit is flashing and OK, STBY or DIAG STBY is displayed on the operator panel.
When the power button on the operator panel is pressed:
– There is no indication of activity
– The power LED on the operator panel does not come on
– The green LED on the rear of the system unit does not come on
– The dc LEDs on the power supplies are not on
– None of the fans start to turn.
Go to “Step 1520-7” on page 53.
v
The ac LEDs on the power supplies are on, the green LED on the rear of the system
unit is flashing and OK, STBY or DIAG STBY is displayed on the operator panel.
When the power button on the operator panel is pressed:
– The power LED on the operator panel comes on
– The green LED on the rear of the system unit comes on
– The dc LEDs on the power supplies are on
– All of the fans start to turn but the power LED on the operator panel, the green
LED on the rear of the system unit, the dc LEDs on the power supplies and the
fans do not stay on.
Go to “Step 1520-7” on page 53.
v
An SRN in RS/6000
Eserver
pSeries Diagnostic Information for Multiple Bus
Systems listed “MAP 1520: Power” on page 49 in the
″
Action/Description
″
column for
a voltage sensor out of range.
50
Service Guide