|
Problem
|
Cause / Solution
|
|
CPU Module 'Will not boot'
|
No / wrong voltage power supplied or wrong polarity |
|
Check for correct power input at the input terminals |
| Incorrect
Setup (video disabled etc.) |
|
Check that Video is enabled within the CMOS settings |
| Defective
or misconnected device on bus |
|
Check for misaligned bus connectors; 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. |
|
Will not boot from particular drive or device
|
Device
not bootable |
| Use sys command on drive
or reformat the device using the /s switch. |
|
Incorrect boot sequence |
|
Check to boot sequence within the CMOS settings |
| Power
not connected to boot drive |
|
Connect power to drive |
|
Erratic Operation
|
Excessive
bus loading |
| Reduce number of PC/l 04
modules in stack; remove termination components from bus signals;
remove power supply bus terminations. |
| Power
supply noise |
| Examine power supply output
with oscilloscope |
| Power
supply limiting |
| Examine power supply output
with oscilloscope; check for voltage drop when hard disk
or floppy drive starts; add bypass caps. |
| Temperature
too high |
| Add fan, processor heat
sink, or other cooling device(s). |
|
Keyboard does not work
|
Keyboard
interface damaged by misconnection |
| Check if Keyboard LEDs Light.
|
| Using USB Keyboard |
|
Ensure USB is enabled within the CMOS settings |
| 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). |
|
COM Port will not transmit in RS422 or RS485 modes
|
Not configured
for RS422/485 |
| Correctly configure serial
port in Setup program. |
| 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 |
Without battery back-up onboard |
|
Connect an external battery |
|
With battery back-up onboard |
|
Check that the battery voltage has not dropped to an unacceptable level |