IBM BDM-610000049 user manual Troubleshooting a PC/104-Plus System, Troubleshooting cont’d

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