IBM 4500R Hardware Maintenance Manual - Page 129

Power supply LED errors, ON position. See

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Error Symptom FRU/Action Diskette drive in-use light stays 1. If there is a diskette in the drive, verify that: on, or the system bypasses the diskette drive, or the diskette drive does not work a. The diskette drive is enabled in the Configuration/Setup utility program. b. The diskette is good and not damaged. (Try another diskette if you have one.) c. The diskette is inserted correctly in the drive. d. The diskette contains the necessary files to start the server. e. The software program is OK. f. Cable is installed correctly (proper orientation) 2. Run Diskette Drive Diagnostics 3. Cable 4. Diskette Drive 5. System Board Monitor problems (general). 1. Monitor Some IBM monitors have their own self-tests. If you suspect a problem with the monitor, refer to 2. Run Video Diagnostics. If diagnostics pass, the problem may be a video driver. the information that comes with 3. Display Adapter / System Board the monitor for adjusting and testing instructions. Power supply LED errors Use the power supply LED information on the following page to troubleshoot power supply problems. Note: The minimum configuration required for the DC Good light to come on is: • Power Supply • Power Backplane • System Board (Power-On Override Switch, which is switch 5 of SW1, set to ON position. See "System board switches and jumpers" on page 42. Note: Power-On Override Switch is for problem determination purposes only. Use of this switch will cause POST errors. AC Good LED Off DC Good LED Off Description No power to system or ac problem. FRU/Action 1. Check ac power to system. 2. Power Supply Symptom-to-FRU index 121

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Symptom-to-FRU index
121
Power supply LED errors
Use the power supply LED information on the following page to troubleshoot power
supply problems.
Note:
The minimum configuration required for the DC Good light to come on is:
•
Power Supply
•
Power Backplane
•
System Board (Power-On Override Switch, which is switch 5 of SW1, set to
ON position. See
“
System board switches and jumpers
”
on page 42.
Note:
Power-On Override Switch is for problem determination purposes
only. Use of this switch will cause POST errors.
Diskette drive in-use light stays
on, or the system bypasses the
diskette drive, or the diskette
drive does not work
1.
If there is a diskette in the drive, verify that:
a.
The diskette drive is enabled in the
Configuration/Setup utility program.
b.
The diskette is good and not damaged.
(Try
another diskette if you have one.)
c.
The diskette is inserted correctly in the drive.
d.
The diskette contains the necessary files to start
the server.
e.
The software program is OK.
f.
Cable is installed correctly (proper orientation)
2.
Run Diskette Drive Diagnostics
3.
Cable
4.
Diskette Drive
5.
System Board
Monitor problems (general).
Some IBM monitors have their
own self-tests.
If you suspect a
problem with the monitor, refer to
the information that comes with
the monitor for adjusting and
testing instructions.
1.
Monitor
2.
Run Video Diagnostics.
If diagnostics pass, the
problem may be a video driver.
3.
Display Adapter / System Board
AC Good LED
DC Good LED
Description
FRU/Action
Off
Off
No power to system or ac
problem.
1.
Check ac power to system.
2.
Power Supply
Error Symptom
FRU/Action