2.4 System Board Troubleshooting

2 Troubleshooting Procedures

Table 2-4 Printer port LED boot mode status (2/9)

LED Status

Test item

Contents

 

 

 

B9h

Saving of key scan code

 

 

 

 

 

Setting of TASK_1ms_TSC

 

 

 

 

 

FAN control

 

 

 

 

 

Sound initialization (for BEEP sound)

Cancel of sound mute

 

 

 

 

 

Setting of volume to max (model that can

 

 

control volume)

 

 

 

 

When BIOS, EC/KBC rewriting is

Blinks green (cycle:2s, on:1s, off:1s)

 

requested

 

 

 

 

 

When BIOS renewal is prohibited

Blinks orange (cycle:8s, on:4s, off:4s) HLT

 

 

after BEEP is sounded for 30s (LED=BBH))

 

 

 

 

When BIOS ROM is abnormal

Blinks orange (cycle:2s, on:1s, off:1s)

 

 

 

 

Key input

Prohibition of USB

 

 

 

 

 

BEEP

 

 

 

 

 

Waiting for Key input

 

 

 

 

Reading of

FDC RESET

 

CHGBIOSA.EXE/CHGFIRMA.EXE

 

 

 

 

 

 

 

Setting of parameters for 2HD (1.44MB)

 

 

 

 

 

Reading of first sector, If it is the data of

 

 

1.44MB (2HD), the media type is definite.

 

 

 

 

 

Setting of parameters for 2DD (720KB)

 

 

 

 

 

Retrieval of “CHGBIOSA.EXE” from the

 

 

root directory.

 

 

Calculation of directory start head and

 

 

sector

 

 

Read 1 sector of the root directory

 

 

Retrieval of entry of “CHGBIOSA.EXE”

 

 

/“CHGFIRMA.EXE” from the sector

 

 

read.

 

 

 

 

 

Reading of EXE header of

 

 

“CHGBIOSA.EXE” and “CHGFIRMA.EXE”

 

 

Key input when error occurred

 

 

 

 

 

Execution of “CHGBIOSA.EXE” and

 

 

“CHGFIRMA.EXE”

 

 

 

TECRA S3 Maintenance Manual (960-532)

[CONFIDENTIAL]

2-21

Page 63
Image 63
Toshiba S4 manual Beep