Chapter2 Troubleshooting Procedures
Satellite U400/Satellite Pro U400/PORTEGE M800
Maintenance Manual 2-17
Code Beeps POST Routine Description
14h
Initialize keyboard controller
16h1-2-2-3 BIOS
ROM
checksum
17h
Initialize cache before memory autosize
18h
8254 timer initialization
1Ah
8237
DMA
controller
initialization
1Ch
Reset Programmable Interrupt Controller
20h1-3-1-1
Test DRAM refresh
22h1-3-1-3
Test 8742 Keyboard Controller
24h
Set ES segment register to 4 GB
26h
Enable A20 line
28h
Autosize
DRAM
29h
Initialize POST Memory Manager
2Ah
Clear 512 KB base RAM
2Ch1-3-4-1
RAM failure on address line xxxx*
2Eh1-3-4-3
RAM failure on data bits xxxx* of low byte of memory bus
2Fh
Enable cache before system BIOS shadow
30h1-4-1-1
RAM failure on data bits xxxx* of high byte of memory bus
32h
Test CPU bus-clock frequency
33h
Initialize Phoenix Dispatch Manager
36h
Warm start shut down
38h
Shadow system BIOS ROM
3Ah
Autosize
cache
3Ch
Advanced configuration of chipset registers
3Dh
Load alternate registers with CMOS values
42h
Initialize interrupt vectors
45h
POST device initialization
46h2-1-2-3
Check ROM copyright notice
48h
Check video configuration against CMOS
49h
Initialize PCI bus and devices
4Ah
Initialize
all
video adapters in system
4Bh
QuietBoot start (optional)
4Ch
Shadow video BIOS ROM
4Eh
Display BIOS copyright notice
50h
Display CPU type and speed
51h
Initialize EISA board
52h
Test
keyboard
54h
Set key click if enabled
58h2-2-3-1
Test for unexpected interrupts
59h
Initialize POST display service
5Ah
Display prompt "Press F2 to enter SETUP"
5Bh
Disable CPU cache
5Ch
Test RAM between 512 and 640 KB
60h
Test
extended
memory
62h
Test extended memory address lines
Summary of Contents for Satellite Pro U400 Series
Page 110: ...Test Program for Field Satellite U400 and Satellite Pro U400 Tests and Diagnostics Manual 17 ...
Page 168: ...Replacement Procedures Satellite U400 Satellite Pro U400 PORTEGE M800 Maintenance Manual 4 iv ...
Page 276: ...Pin Assignment 36 Satellite U400 Satellite Pro U400 PORTEGE M800 Maintenance Manual ...
Page 302: ...Wiring Diagrams F 2 Satellite U400 Satellite Pro U400 PORTEGE M800 Maintenance Manual ...