IBM L40 SX, Quick Reference

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Problem Action
Screen Is
unreadable or
distorted. Check the display mode of the screen. Reverse video can
affect graphic images.
If the above item is correct and the screen is still unreadable
or distorted, run the tests described in the instructions supplied
with the PS/2 display. If those tests show the PS/2 display is
OK, have the system serviced.
Wrong characters
appear on the
screen.
Have the system serviced.
Solving Computer Problems 78
Option Problems
Problem Action
An IBM option that
used to work does
not work now.
Check to see:
1.If the option came with its own testing instructions, follow
those instructions to test the option.
2.If the option came with instructions to update the backup
copy of the Reference Diskette, follow the instructions
supplied with the option.
3.If the serial adapter is installed, On is specified for the Serial
Adapter power option of the Set Features Menu, or the PS2
command,
PS2 SET SER A O
(or
PS2 SER A O
) is
performed.
4.If the internal data/fax modem is installed, On is specified for
the Data/Fax Modem power option of the Set Features
Menu, or the PS2 command,
PS2 SET M O
(or
PS2 M O
)
is performed.
If the above items are correct and the testing programs on the
Reference Diskette found no problem, have the system and
option serviced.