Procedure 3 Printer Port Led Check (In Resume Mode) - Toshiba Satellite M20 Maintenance Manual

2.4 System Board

Procedure 3 Printer Port LED Check (in Resume Mode)

The printer port LED displays the POST status and error status by turning lights on and off as
an eight-digit binary value obtained in the resume or suspend mode after the system unit is
switched on.
Follow the steps below to use the printer port LED:
1. Turn on the computer and set the resume or suspend mode.
2. Turn off the computer.
3. Plug the printer port LED into the computer's parallel port (printer port).
4. Read the LED status from left to right as you are facing the back of the computer.
5. Convert the LED status from binary to hexadecimal notation.
6. If the final LED status is FFh (normal status), go to Procedure 5.
7. If the final LED status matches any other status in Table 2-2, go to Procedure 6.
Table 2-2
< Resume mode >
LED Status
(Hexadecimal)
0H DIAG_SYSTEM_INIT
1H DIAG_A20_DISABLE
2H DIAG_INIT_CHIPSET
3H DIAG_TEST_RAM
4H DIAG_MOVE_BB_LOADER
5H DIAG_EXECUTE_IN_DRAM
6H DIAG_USER_FLASH_CHECK
7H DIAG_SHADOW_BIOS
8H DIAG_CHECKSUM_BIOS
9H DIAG_NORMAL_BOOT
AH DIAG_CRISIS_BOOT
FH DIAG_FATAL_ERROR
C C H DIAG_CRISIS_BEGIN
99H DIAG_RESUME_RAM_ERROR
Satellite M20 Maintenance Manual
Printer port LED resume mode status (1/7)
Test Item
Boot started,read the cmos data for makesure
main board power is stable
Disable A20 through A20
Initialize ChipsetSet,load chipset default
size chache RAM
send patten for test the basic 640k RAM
Move boot load segment into the RAM
program execution from DRAM
Test print port for check
crisis option is enable or not
Decompress the system BIOS, and
Shadow System BIOS to RAM
Checksum System BIOS ROM
Jump to the reset point
Proceed with Crisis Boot,first initial
superio and boot device
Fatal Error,like the RAM error or ROM error
Start process the Crisis recovery procedure
Resume SMRAM not Found
2 Troubleshooting
Description
2-17