IBM 6643 - Manual (Page 63)

If the POST finishes without detecting any problems, a single beep sounds and the
first screen of the operating system or application program appears.
Note:
Types 2179 and 6643 computers default to come up quiet (no beep and no memory count
and checkpoint code display) when no errors are detected by POST.
To enable beep and memory count and checkpoint code display when a successful POST
occurs, do the following:
1. Select Start Options in the Configuration/Setup Utility program (see “Setup Utility
program” on page 5).
2. Set Power-On Self-Test to Enhanced .
If the POST detects a problem, an error message appears on the screen. A single
problem can cause several error messages to appear. When you correct the cause of
the first error message, the other error messages probably will not appear on the
screen the next time you turn on the system.
POST Error Code FRU/Action
161
Bad CMOS battery
1. Run Setup, reload defaults, set
Date/Time
2. CMOS Backup Battery (see “Safety
information” on page 102)
3. System Board
162
CMOS checksum error
1. Run Setup, reload defaults, set
Date/Time
2. CMOS Backup Battery (see “Safety
information” on page 102)
3. System Board
163
Clock not updating or invalid time set
1. Time and Date Set?
2. CMOS Backup Battery (see “Safety
information” on page 102)
3. System Board
164
POST detected a memory size decrease
1. Run Setup. Check System Summary
menu for memory size change. (See
“Setup Utility program” on page 5.)
2. Run the Extended Memory Diagnostic
tests
301 Keyboard error
1. Keyboard
2. Keyboard Cable
3. System Board
662 Diskette drive configuration error
1. Diskette drive configuration error or
wrong diskette drive type. Run Setup
Configuration
1762
Hard disk drive configuration error
1. Run Configuration. (See “Setup Utility
program” on page 5.) This occurs when
a drive is added or removed.
Chapter 5. Symptom-to-FRU Index 55