7 Troubleshooting
M1046983 04/08 7-5
7.4 Troubleshooting the HPDU Display
Symptom Resolution
System will not boot from external Compact Flash
card during software installation process
1. Verify that the Compact Flash card is properly inserted.
2. Insert a backup Compact Flash card.
3. Open the HPDU and verify that the external Compact Flash card carrier
socket (1009-5961-000) is properly seated.
4. Replace external Compact Flash card carrier socket (1009-5961-000).
5. Replace HPDU main PCB.
Display appears mostly white and the green
LED is on
1. Verify that the cable connecting the HPDU to the system’s rear panel is
properly seated.
2. Open the HPDU and verify that the cable connecting the main PCB to the
display at J28 is properly seated within the mating housing and check for
damage and/or wear.
3. Replace the HPDU.
Rotary encoder fails to work 1. Open the HPDU and verify that the cable connecting the main PCB to the
rotary encoder at J38 is properly seated within the mating connector.
2. Verify that the revision of the flex cables connecting the main PCB to the
keypads at J23 and J26 are at revision 101 or greater by inspecting the
labels directly adhered to the flex cables.
3. Replace the rotary encoder,
4. Replace the HPDU main PCB.
Unit fails to boot and the green LED is on 1. Open the HPDU and ensure that the lithium coin cell at J17 on the main
PCB is properly installed.
2. Replace the lithium coin cell at J17 on the main PCB.
3. Verify that the internal Flash card at J10 on the main PCB is properly
seated.
4. Attempt to boot the system using a spare compact flash card and
replace the card if necessary.
5. Attempt to boot the system from the external Compact Flash card.
6. Replace the HPDU main PCB.
Excessive fan noise 1. Clean the HPDU fan inlet filter.
2. Check for obstructions within the external fan and verify source of fan
noise.
3. Open the HPDU and verify internal CPU fan noise.
4. Replace internal or external fan assembly if causing excessive
noise.
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