HP L1000 - 9000 - 0 MB RAM Troubleshooting Manual page 4

rp5400, rp5430, rp5450 and rp5470 Troubleshooting and Build-Up Procedures
System Will Not Power On to Standby Mode
problem. Therefore fully analyze the GSP error log contents associated with the power-off condition.
Occasionally the error logs do not have any relevant entries or may not point to any specific condition—for
instance only specifying a high voltage DC undervoltage condition. In this case go to the problem statement in
this document that best describes the symptom and follow the troubleshooting steps in order.
System Will Not Power On to Standby Mode
If the system will not power on to standby mode, follow these troubleshooting steps. These troubleshooting
hints are for standby mode (power switch OFF).
1. Check voltage: +48vdc and +15vdc.
• +48vdc. The power supplies are creating +48vdc output if the power supply LED on the power supply
module(s) is solid green. The +48vdc is measured at pins 2, 4 and 5 (Figure 1-1 on page 5) of power
converter output J39.
NOTE Measuring voltages at J39 while it is connected to the system board requires a voltmeter
probe with a sharp tip about one inch long to contact the crimp terminals.
• +15vdc (housekeeping voltage). The housekeeping voltage is present when the power LED on the
front panel is blinking green. The housekeeping voltage is present when the power LED on the
platform monitor is blinking green. The +15vdc is measured at pin 1 (Figure 1-1 on page 5) of power
converter output J39 and at the V15 testpoint on the platform monitor.
2. Reduce the system to the minimum power configuration for standby mode (+48vdc and +15vdc voltages):
power supply 0, the power converter, and the system board. Replace these field replaceable units (FRUs)
individually or all at once until the voltages are present.
System Will Not Power On or Remain Powered On
These are troubleshooting hints for failure to power on.
1. Ensure standby mode voltages are present.
• Turn the power switch on. In addition to +48vdc and +15vdc standby voltages, the +12vdc, +5.1vdc,
and +3.3vdc should be present.
• +12vdc. The +12vdc voltage is present if the embedded disks have power. Examine green power LED
on embedded disks. This LED should momentarily illuminate after the power switch has been turned
on. The +12vdc is measured at pins 3 and 6 (Figure 1-1 on page 5) of power converter output J39.
• +5.1vdc. This voltage cannot be verified by observing LEDs. The +5.1vdc is measured between bus
bar contacts J37 and J38 (Figure 1-1 on page 5) on the system board and at the V5B testpoint on the
platform monitor.
• +3.3vdc. This voltage cannot be verified by observing LEDs. The +3.3vdc is measured between bus
bar contacts J35 and J36 (Figure 1-1 on page 5) on the system board.
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Chapter 1