IBM BDM-610000049 - Manual (Page 103)

BDM-610000049 Rev G Appendix B: Troubleshooting 93
Troubleshooting a PC/104- Plus System
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.
keyboard does not work keyboard interface damaged
by misconnection • check if keyboard LEDs light
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
work, but one does both drives configured for
master • set one drive for master and the other for slave operation (consult
drive documentation)
floppy does not work “data error” due to drive
upside down • orient drive properly (upright or on side)
will not boot when video
card is removed illegal calls to video controller • look for software trying to access nonexistent video controller for
video, sound, or beep commands
abnormal video flat panel is enabled • disable the flat panel in the BIOS
can only use 640 x 480
resolution in Windows flat panel is enabled • disable the flat panel in the BIOS
video drivers not installed • install the video drivers
will not boot from PCMCIA
hard drive booting from PCMCIA is not
supported • boot from SSD, use autoexec.bat to load PCMCIA drivers, run
application from PCMCIA card
COM port will not work in
RS-422 or RS-485 modes not configured for RS-422/485 • correctly configure serial port in Setup program
COM port will not transmit
in RS-422 or RS-485 mode not enabling transmitters • control RTS* bit of Modem Control Register to enable transmitters;
see Serial Port descriptions
date and time not saved
when power is off no backup battery • connect a backup battery to the multi-function connector
screen flickers at high
resolutions when processor
is fully utilized memory with ECC enabled
requires additional system
memory resources; the
integrated graphics engine
has less memory bandwidth
for access to the graphics
frame buffer • disable ECC
Table 64 Troubleshooting (cont’d)
Problem Cause Solution