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Symptom/Error FRU/Action
Real-time clock inaccurate. 1. See “Checking the
Backup Battery” on
page 75 before
replacing any FRUs.
2. Backup Battery
3. System Board
Printer problems. 1. See “Printer
Checkout” on
page 474
Serial or serial port device
problems.
1. Device
2. Cable
3. Serial Adapter (if
attached)
4. System Board
Parallel or parallel port
device problems.
1. Device/printer
2. Cable
3. Parallel Adapter (if
attached)
4. System Board
Internal Data/Fax modem
does not communicate with
a remote modem or a
facsimile machine.
1. See “Fax/Modem
Checkout” on
page 472
PS2 command cannot
power-off internal modem
unless computer is
powered-off.
1. Create new PS2
setup program using
UINSTALL command.
(Reference Diskette
must be 1.10 or later.)
92 IBM Mobile Systems HMM