IBM 3746-900, Installation And Maintenance Manual

Page: 95 / 264

Message/Symptom FRU to replace/actions to take
Power-on indicator or hard disk drive
in-use light not on, but computer works
correctly. 1. Power Supply
2. System Board
3. LED Cables
Printer problems. See “Printer” on page 3-19.
Program loads from the hard disk drive
with a known-good diagnostics diskette in
the first 3 1/2-in. diskette drive. 1. Check the Configuration/Setup
Utility.
2. Diskette Drive
3. Diskette Drive Cable
4. System Board
5. Power Supply
RPL computer cannot access programs
from its own hard disk. 1. If network administrator is using
LCCM Hybrid RPL, check startup
sequence: First device: network;
Second device: hard disk drive.
2. Hard disk drive
RPL computer does not RPL from server. 1. Check startup sequence.
2. Check the “Token-Ring Adapter Card
LED Status” on page 3-25.
Serial or parallel port device failure
(system board port). 1. External Device Self-Test OK?
2. External Device
3. Cable
4. System Board
Serial or parallel port device failure
(adapter port). 1. External Device Self-Test OK?
2. External Device
3. Cable
4. Alternate Adapter
5. System Board
Some or all keys on the keyboard do not
work. 1. Keyboard
2. Keyboard Cable
3. System Board
Beep Symptoms
Beep symptoms are short tones or a series of short tones separated by pauses
(intervals without sound). See Table 3-2.
Table 3-2. Beep Symptoms
Beep Symptom Description
1-2- X One beep
A pause (or break)
Two beeps
A pause (or break)
Any number of beeps
4 Four continuous beeps
Beep Symptom FRU/Action
1-1-3
CMOS read/write error
1. Run Setup.
2. System Board
1-1-4
ROM BIOS check error
System Board
Chapter 3. Service Processor Troubleshooting
3-15