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reference page before replacing the FRU. The suspected
FRU name is also displayed on the screen. The following
table shows the FRU code:
If the problem still remains after replacement of the FRUs,
go to “Undetermined Problems” on page 209.
FRU Code FRU
10 System board
30 Reserved
32 External keyboard
33 External mouse
40 LCD unit
45 External CRT
50 1. Reseat the diskette drive (FDD-1)
2. Diskette drive (FDD-1)
51 1. Reseat the diskette drive (FDD-2)
2. Diskette drive (FDD-2)
60 1. Reseat the hard disk drive
2. Hard disk drive
70 PCMCIA-2 (Replicator) .
72 PCMCIA slot assembly
90 CD-ROM drive
Beep Symptoms
Symptom / Error FRU / Action in Sequence
Continuous beeps. System board
One beep and a blank,
unreadable, or flashing
LCD.
1. Reseat the LCD
connector.
2. LCD unit
3. System board
4. Subcard
One beep, and the message
“Unable to access boot
source.”
1. Boot device
2. System board
One long and two short
beeps, and a blank or
unreadable LCD.
1. System board
2. LCD unit
One long beep followed by
four short beeps each time
the power switch is
operated.
(System cannot power-on
due to low battery voltage.)
Connect the AC Adapter
or install a fully charged
battery.
One beep every second.
(System is shutting down
due to low battery voltage.)
Connect the AC Adapter
or install a fully charged
battery. (Allow the
system to complete
shutdown before
changing the battery.)
204 IBM Mobile Systems - ThinkPad HMM Volume 3