Service manual

Chapter 4 Diagnostics
31
Real-Time Clock
Test
Checks the real-time clock registers and performs a test to ensure the clock is
running. Test failure causes an error code to be displayed.
Keyboard Test
Invokes built-in keyboard self-test of the keyboard's microprocessor and tests
for stuck keyboard keys. Test failure causes an error code to be displayed.
Mouse Test
Invokes built-in mouse self-test of mouse's microprocessor and tests for stuck
mouse buttons. Test failure causes an error code to be displayed.
Flexible Disk
Controller
Subsystem Test
Tests for proper operation of the flexible disk controller. Test aborts after the
first error is found and will not test any further. Test failure causes an error
code to be displayed.
Internal Numeric
Coprocessor Test
Checks for proper operation of the numeric coprocessor part of the processor.
Test failure causes an error message to be displayed and the boot process to
abort.
Serial Port Test
Tests the two embedded serial port registers. Test failure causes an error
code to be displayed.
Parallel Port Test
Tests the embedded parallel port to verify if it is enabled. Test failure causes
an error code and an error message to be displayed.
Hard Disk
Subsystem Test
Tests for proper operation of the hard disk controller and performs a read-
verify of a sector on the disk. Test aborts after the first error is found and will
not test any further. Test failure causes an error code to be displayed.
System
Configuration Tests
Checks for configuration errors and checksums accessory ROMs. Test
failure causes an error code to be displayed.
Beep Codes
If the POST routines cannot display messages when an error occurs before the video display is initialized,
the server emits a series of beeps. This means that if on boot you get a blank screen, but hear beeps, you
should refer to the table below to interpret the beeps.
Beep Codes for Fatal Errors
P = Check and replace processor board
S = Check and replace system board
M = Check and replace memory modules
R = Replace ROM chip
Beep Code Test Failure I/O port 80H Repair
1-3-1-1 Test DRAM refresh 20 S, P
1-3-1-3 Test 8742 Keyboard Controller 22 S, P
1-3-3-1 Test DRAM 28 M
1-3-4-1 Test 64K base address lines 2C M, P