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5. Reconnect the failing device directly to the computer.
(If another device already connected to the computer,
remove it first.)
6. Go to the “How to Run the Diagnostics” on page 292
and run the diagnostics.
7. If the advanced diagnostic device test does not find
an error, suspect a problem with the port replicator of
the system expansion bus.
8. Power off the computer and reconnect the port
replicator.
9. Power on the computer and run the following
advanced diagnostic tests:
Serial port test with the wrap plug installed on
the replicator.
Parallel port test with the wrap plug installed on
the replicator.
FDD-2 device test on the failing device with
scratch diskette.
10. If diagnostic errors appear, replace the replicator or
diskette drive attachment unit.
If the problem remains after the replacement, replace
the system board.
11. If power problems appear only when using the
replicator, replace the replicator.
Power Management Features
Three power management modes are provided by the
computer to reduce power consumption and prolong
battery power.
Standby Mode: When in standby mode the following
occurs:
The LCD backlight turns off.
The hard disk motor stops.
Events that cause the computer to enter standby mode:
Standby requested by the Fn key. (Fn+F3)
No activity under auto-standby enabled by the
ThinkPad Features program.
Events that cause the computer to exit or resume standby
mode:
(Resume) Any key operation.
Suspend Mode: When in suspend mode, the
following, in addition to the four actions of standby mode,
occur:
The LCD is powered-off.
The hard disk is powered-off.
The CPU is stopped.
276 IBM Mobile Systems - ThinkPad HMM Volume 3