IBM 4500R Hardware Maintenance Manual - Page 139

System shutdown, Voltage related system shutdown, System shutoff due to X V

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Page 139 highlights

Message 12V "X" bus fault (level- critical; overcurrent condition on 12 volt "X" voltage bus) Action 1. Check for short circuit on 12 volt "X" voltage bus 2. See "Power checkout" on page 26. 5V fault (level- 1. Check for short circuit on 5 v bus critical; overcurrent condition on 5 V subsystem) 2. See"Power checkout" on page 26. 240 VA fault (level-critical; 1. See "Power checkout" on page 26. overcurrent or overvoltage condition in power subsystem) System shutdown Refer to the following tables when experiencing system shutdown related to voltage or temperature problems. Voltage related system shutdown Message Action System shutoff due to "X" 1. See "Power checkout" on page 26. current over max value (level-critical; system drawing too much current on voltage "X" bus) System shutoff due to "X" current under min value (level-critical; current on voltage bus "X" under minimum value) 1. See "Power checkout" on page 26. System shutoff due to "X" V over 1. Check power supply connectors voltage (level-critical; system shutoff due to "X" supply 2. Replace power supply over voltage) 3. Replace power backplane System shutoff due to "X" V 1. under voltage (level- critical system shutoff due to "X" 2. supply under voltage) 3. Check power supply connectors Replace power supply Replace power backplane System shutoff due to VRM "X" 1. Replace power supply over voltage 2. Replace power supply backplane Temperature related system shutdown Message Action System shutoff due to board over 1. Ensure system is being properly cooled, see temperature (level- "Temperature checkout" on page 27. critical; board is over temperature) 2. Replace board Symptom-to-FRU index 131

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Symptom-to-FRU index
131
System shutdown
Refer to the following tables when experiencing system shutdown related to voltage
or temperature problems.
Voltage related system shutdown
Temperature related system shutdown
12V "X" bus fault
(level-
critical; overcurrent condition on
12 volt "X" voltage bus)
1.
Check for short circuit on 12 volt "X"
voltage bus
2.
See
“
Power checkout
”
on page 26.
5V fault
(level-
critical; overcurrent condition on 5
V subsystem)
1.
Check for short circuit on 5 v
bus
2.
See
“
Power checkout
”
on page 26.
240 VA
fault
(level-critical;
overcurrent or overvoltage
condition in power subsystem)
1.
See “Power checkout” on page 26.
Message
Action
System shutoff due to "X"
current over max value
(level-critical; system drawing too
much current on voltage "X" bus)
1.
See “Power checkout” on page 26.
System shutoff due to "X"
current under min
value
(level-critical; current on voltage
bus "X" under minimum value)
1.
See “Power checkout” on page 26.
System shutoff due to "X" V over
voltage
(level-critical;
system shutoff due to "X" supply
over voltage)
1.
Check power supply connectors
2.
Replace power supply
3.
Replace power backplane
System shutoff due to "X" V
under voltage
(level-
critical system shutoff due to "X"
supply under voltage)
1.
Check power supply connectors
2.
Replace power supply
3.
Replace power backplane
System shutoff due to VRM "X"
over voltage
1.
Replace power supply
2.
Replace power supply backplane
Message
Action
System shutoff due to board over
temperature
(level-
critical; board is over temperature)
1.
Ensure system is being properly cooled
, see
“
Temperature checkout
”
on page 27.
2.
Replace board
Message
Action