Table 64 Troubleshooting (cont’d)

Problem

Cause

Solution

 

 

 

keyboard does not work

keyboard interface damaged

check if keyboard LEDs light

 

by misconnection

 

 

 

 

 

wrong keyboard type

verify keyboard is an “AT” type or switch to “AT” mode

 

 

 

floppy drive light always on

cable misconnected

check for floppy drive cable connected backwards

 

 

 

two hard drives will not

both drives configured for

set one drive for master and the other for slave operation (consult

work, but one does

master

drive documentation)

 

 

 

floppy does not work

“data error” due to drive

orient drive properly (upright or on side)

 

upside down

 

 

 

 

will not boot when video

illegal calls to video controller

look for software trying to access nonexistent video controller for

card is removed

 

video, sound, or beep commands

 

 

 

abnormal video

flat panel is enabled

disable the flat panel in the BIOS

 

 

 

can only use 640 x 480

flat panel is enabled

disable the flat panel in the BIOS

resolution in Windows

 

 

video drivers not installed

install the video drivers

 

 

 

 

will not boot from PCMCIA

booting from PCMCIA is not

boot from SSD, use autoexec.bat to load PCMCIA drivers, run

hard drive

supported

application from PCMCIA card

 

 

 

COM port will not work in

not configured for RS-422/485

correctly configure serial port in Setup program

RS-422 or RS-485 modes

 

 

 

 

 

COM port will not transmit

not enabling transmitters

control RTS* bit of Modem Control Register to enable transmitters;

in RS-422 or RS-485 mode

 

see Serial Port descriptions

 

 

 

date and time not saved

no backup battery

connect a backup battery to the multi-function connector

when power is off

 

 

 

 

 

screen flickers at high

memory with ECC enabled

disable ECC

resolutions when processor

requires additional system

 

is fully utilized

memory resources; the

 

 

integrated graphics engine

 

 

has less memory bandwidth

 

 

for access to the graphics

 

 

frame buffer

 

 

 

 

Troubleshooting a PC/104-PlusSystem

If you have reviewed the preceding table and still cannot isolate the problem with your CMX158886 cpuModule, please try the following troubleshooting steps. Even if the resulting information does not help you find the problem, it will be very helpful if you need to contact technical support.

1.Simplify the system. Remove items one at a time and see if one particular item seems to cause the problem.

2.Swap components. Try replacing items in the system one-at-a-time with similar items.

BDM-610000049 Rev G

Appendix B: Troubleshooting 93

Page 103
Image 103
IBM BDM-610000049 user manual Troubleshooting a PC/104-PlusSystem, Troubleshooting cont’d

BDM-610000049 specifications

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