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13.0 Symptom-to-FRU Index
The Symptom-to-FRU Index lists error symptoms and possible causes.
most likely cause is listed first.
with "General Checkout" in topic 1.0.
you decide which FRUs to have available when servicing a system.
If you are unable to correct the problem using this index, go to
"Undetermined Problem" in topic 2.0.
Warning:
Follow "General IBM Electro-Static Discharge (ESD) Instructions"
in topic FRONT_2.1 before touching system boards, adapters, math
coprocessors, memory module kits, diskette drives, or hard disk drives.
Notes:
1.
If you have both an error message and an incorrect audio response,
diagnose the error message first.
2.
If you cannot run the advanced diagnostic tests but did receive a POST
error code, diagnose the POST error message.
3.
If you did not receive any error message, look for a description of
your error symptoms in the first part of this index.
4.
Check all power supply voltages before you replace the system board.
(See "Power Supply Voltages" in topic 3.0.)
5.
Check the hard disk drive jumper settings before you replace a hard
disk drive.
(See "Hard Disk Drive Jumper Settings" in topic 9.0.)
In the following index, an "X" in an error message can be any number.
+------------------------------------------------------------------------+
¦ Symptom/Error
+------------------------------------+-----------------------------------¦
¦ No beep during POST but system
¦ works correctly
¦ otherwise
+------------------------------------+-----------------------------------¦
¦ No beep during POST
¦
¦
¦
¦
¦
¦
¦
+------------------------------------+-----------------------------------¦
¦ One long and two short beeps
¦ during POST
+------------------------------------+-----------------------------------¦
¦ Continuous beep
+------------------------------------+-----------------------------------¦
¦ Repeating short beeps
¦
¦
+------------------------------------+-----------------------------------¦
¦ Changing or wrong colors
+------------------------------------+-----------------------------------¦
¦ Intensity or coloration varies
¦ from left to right of characters
¦ and color bars
+------------------------------------+-----------------------------------¦
¦ Other display problems not listed
¦ above (including blank or
¦ illegible display)
+------------------------------------+-----------------------------------¦
¦ Diskette drive in-use light
¦ remains on or does not light when
¦ drive is active
+------------------------------------+-----------------------------------¦
¦ Power-on indicator or hard disk
¦ drive in-use light not on but
¦ system works
¦ correctly otherwise
+------------------------------------+-----------------------------------¦
¦ The "Insert a Diskette" icon or
¦ the "BASIC" screen appears with a
¦ known-good diagnostics diskette in ¦ Diskette Drive Cable
¦ first 3.5-inch diskette drive
+------------------------------------+-----------------------------------¦
¦ A nonsystem disk or disk
IBM PS/2 Model 25 SX HMR
Symptom-to-FRU Index
When servicing a system, always begin
This index can also be used to help
¦ FRU/Action
¦ System Board
¦
¦
¦ See "Undetermined Problem" in
¦ topic 2.0.
¦ System Board
¦ Memory Module Kit
¦ Any Adapter or Device
¦ Bus Adapter
¦ Power Cord
¦ Display Assembly
¦ System Board
¦
¦ System Board
¦ Keyboard (stuck key?)
¦ System Board
¦ Keyboard Cable
¦ Display Assembly
¦ Display Assembly
¦ System Board
¦
¦ See "Display" in topic 4.0 .
¦ System Board
¦ Display Assembly
¦ Diskette Drive
¦ System Board
¦ Diskette Drive Cable
¦ Display Assembly
¦ System Board
¦
¦
¦ Diskette Drive
¦ System Board
¦ Network Adapter
¦ Diskette Drive
¦ Copyright IBM Corp. 1992
13.0 - 1
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