IBM BDM-610000049 user manual Common Problems and Solutions, Troubleshooting

Common Problems and Solutions

Table 64 lists some of the common problems you may encounter while using your CMX158886 cpuModule, and suggests possible solutions.

If you are having problems with your cpuModule, review this table before contacting RTD Technical Support.

	Table 64	Troubleshooting
Problem	Cause	Solution
cpuModule	no power or wrong polarity	• check for correct power on the PC/104-Plus(PCI) bus connector
“will not boot”
	incorrect Setup	• reboot and press Delete to run Setup
	defective or misconnected	• check for misaligned bus connectors
	device on bus	• remove other cards from stack
	cable connected backwards	• verify all cables are connected correctly
	SSD installed backwards	• check for an SSD memory installed in socket backwards
cpuModule keeps rebooting	problem with power supply	• check for correct power on the PC/104-Plus(PCI) bus connector
	reset switch is on	• check that the reset button is not pushed in
	watchdog timer is not being	• verify that the watchdog timer is being refreshed before it times
	serviced quickly enough		out
cpuModule will not boot	device not bootable	• use sys command on drive or reformat the device using
from particular drive or			the /s switch
device
	device not formatted	• format drive using /s switch
	power not connected to	• connect power cable to floppy or hard drive
	boot drive
erratic operation	excessive bus loading	• reduce number of modules in stack
		• remove termination components from bus signals
		• remove any power supply bus terminations
	power supply noise	• examine power supply output with oscilloscope
		• glitches below 4.75 VDC will trigger a reset
		•	add bypass caps
	power supply limiting	• examine power supply output with oscilloscope
		• check for voltage drop below 4.75 VDC when hard drive or floppy
			drive starts
		•	add bypass caps
	insufficient cabling through	• increase wire gauge to connector
	power connector	• power through bus connectors
	temperature too high	• add fan, processor heatsink, or other cooling device(s)
		• See Thermal Management on page 72
	memory address conflict	• check for two hardware devices (e.g. Ethernet, SSD, Arcnet,
			PCMCIA) trying to use the same memory address
		• check for two software devices (e.g. EMM386, PCMCIA drivers,
			etc.) trying to use the same memory addresses
		• check for hardware and software devices trying to use the same
			memory address
		• check for an address range shadowed (see Advanced Setup screen)
			while in use by another hardware or software device
	I/O address conflict	• check for another module trying to use I/O addresses reserved for
			the cpuModule between 010h and 01Fh

• check for two modules (e.g. dataModules, PCMCIA cards, Ethernet) trying to use the same I/O addresses

92 CMX158886 cpuModule BDM-610000049 Rev G