IBM 887022X Maintenance Manual - Page 201

Level, light

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Level 2 light path The level 2 light path consists of the light path diagnostics panel (see Figure 27 on page 66). Note: See Chapter 8, "Parts listing, Type 8870," on page 249 to determine which components are replaceable by the customer, and which components should be replaced by an IBM field service technician. Level 2 light path LED FRU/action All LEDs off (error log full) Note: "Event Log" LED may be lit. 1. System-Error log is 75% full; analyze the log entries to determine the nature of the error messages. 2. Save and/or clear the log. 3. For a PFA alert, check error log for failures. 4. To clear a PFA alert; remove ac power for at least 20 seconds; then, reconnect and power up system. CPU (failed microprocessor) Note: Verify correct installation sequence; see "Installing and replacing a microprocessor" on page 116. Check event log or follow level 3 light path chart (see "Level 3 light path" on page 193) to determine location of failing level 4 light path LED (CPU). MEMORY (memory error) Check event log or follow level 3 light path chart (see "Level 3 light path" on page 193) to determine location of failing level 4 light path LED (DIMM). DASD (hot-swap hard drive failure) 1. Failing drive (reseat/replace). Note: If RAID system, refer to Hardware Maintenance Manual for 2. Be sure the fans are operating correctly and the air flow is good. the specific RAID adapter. 3. SCSI backplane. PCI -X BUS (adapter failure) 1. Check System Error log. 2. Failing adapter. 3. PCI-X board. FAN (fan failure) Note: A failing fan can also cause the TEMP and DASD LEDs to be on. 1. Check individual fan LEDs. 2. Replace respective fan. 3. SMP board. TEMP (temperature too high) 1. If a fan LED is on, replace the fan. 2. Ambient temperature must be within normal operating specifications. See "Features and specifications" on page 3 3. Examine System Error log. a. System over recommended temperature b. DASD over recommended temperature 1) Overheating hard disk drive 2) DASD backplane c. Microprocessor x over recommended temperature (where x is microprocessor number) 1) Reseat microprocessor x and heat sink. 2) Microprocessor x. d. Power supply fault / over temp v Failing power supply e. Operator information panel Chapter 7. Symptom-to-FRU index 191

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Level
2
light
path
The
level
2
light
path
consists
of
the
light
path
diagnostics
panel
(see
Figure
27
on
page
66).
Note:
See
Chapter
8,
“Parts
listing,
Type
8870,”
on
page
249
to
determine
which
components
are
replaceable
by
the
customer,
and
which
components
should
be
replaced
by
an
IBM
field
service
technician.
Level
2
light
path
LED
FRU/action
All
LEDs
off
(error
log
full)
Note:
“Event
Log”
LED
may
be
lit.
1.
System-Error
log
is
75%
full;
analyze
the
log
entries
to
determine
the
nature
of
the
error
messages.
2.
Save
and/or
clear
the
log.
3.
For
a
PFA
alert,
check
error
log
for
failures.
4.
To
clear
a
PFA
alert;
remove
ac
power
for
at
least
20
seconds;
then,
reconnect
and
power
up
system.
CPU
(failed
microprocessor)
Note:
Verify
correct
installation
sequence;
see
“Installing
and
replacing
a
microprocessor”
on
page
116.
Check
event
log
or
follow
level
3
light
path
chart
(see
“Level
3
light
path”
on
page
193)
to
determine
location
of
failing
level
4
light
path
LED
(CPU).
MEMORY
(memory
error)
Check
event
log
or
follow
level
3
light
path
chart
(see
“Level
3
light
path”
on
page
193)
to
determine
location
of
failing
level
4
light
path
LED
(DIMM).
DASD
(hot-swap
hard
drive
failure)
Note:
If
RAID
system,
refer
to
Hardware
Maintenance
Manual
for
the
specific
RAID
adapter.
1.
Failing
drive
(reseat/replace).
2.
Be
sure
the
fans
are
operating
correctly
and
the
air
flow
is
good.
3.
SCSI
backplane.
PCI
-X
BUS
(adapter
failure)
1.
Check
System
Error
log.
2.
Failing
adapter.
3.
PCI-X
board.
FAN
(fan
failure)
Note:
A
failing
fan
can
also
cause
the
TEMP
and
DASD
LEDs
to
be
on.
1.
Check
individual
fan
LEDs.
2.
Replace
respective
fan.
3.
SMP
board.
TEMP
(temperature
too
high)
1.
If
a
fan
LED
is
on,
replace
the
fan.
2.
Ambient
temperature
must
be
within
normal
operating
specifications.
See
“Features
and
specifications”
on
page
3
3.
Examine
System
Error
log.
a.
System
over
recommended
temperature
b.
DASD
over
recommended
temperature
1)
Overheating
hard
disk
drive
2)
DASD
backplane
c.
Microprocessor
x
over
recommended
temperature
(where
x
is
microprocessor
number)
1)
Reseat
microprocessor
x
and
heat
sink.
2)
Microprocessor
x.
d.
Power
supply
fault
/
over
temp
v
Failing
power
supply
e.
Operator
information
panel
Chapter
7.
Symptom-to-FRU
index
191