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Symptom/Error FRU/Action in Sequence
Battery fuel-gauge
does not go higher
than 90%.
1. Remove Battery ASM and let
it cool for 2 hours.
2. Refresh battery (continue
using battery in BIOS Setup
mode until power off, then
charge battery).
3. Battery
4. DC/DC & Charger board
5. System board
System configuration
does not match the
installed devices.
1. Load Setup Defaults and
reboot the system.
2. Reseat the Combobay ASM.
System hangs
intermittently.
1. Reseat Hard Disk/Combobay
ASM.
2. Fan ASM
3. System board
Peripheral-Device-Related Symptom
Note: If you cannot find a symptom or an error in this list
and the problem remains, see “Undetermined
Problems” on page 47.
Symptom/Error FRU/Action in Sequence
External display does
not work correctly.
System board
USB does not work
correctly.
System board
Print problems. Run printer self-test.
Printer driver
Printer cable
System board
Serial or parallel port
device problems.
Device driver
Device cable
Device
System board
Intermittent Problems
Intermittent system hang problems can be caused by a
variety of reasons that have nothing to do with a hardware
defect, such as cosmic radiation, electronic discharge, or
software errors. FRU replacement should be considered
only when a recurring problem exists.
When analyzing an intermittent problem, do the following:
1. Run the advanced diagnostic test for the system
board in loop mode at least 10 times.
2. If no error is detected, do not replace any FRUs.
46 ThinkPad 390E