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

Page 101 Page 103
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IBM BDM-610000049 user manual Common Problems and Solutions, Troubleshooting, Problem Cause Solution
Page 101 Page 103

BDM-610000049 specifications

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