2.4 System Board Troubleshooting
This section describes how to determine if the upper or lower system board is defective or not
functioning properly. Start with Procedure 1 and continue with the other procedures as
instructed. Procedures described in this section include:
Procedure 1: Message Check
Procedure 2: Printer Port LED Check in Boot Mode
Procedure 3: Printer Port LED Check in Resume Mode
Procedure 4: Diagnostic Test Program Execution Check
Procedure 5: System Board Replacement Check
Procedure 1 Message Check
When the power is turned on, the system performs the Initial Reliability Test (IRT) installed in
the BIOS ROM. The IRT tests and initializes each IC on the system boards.
❑ If an error message is shown on the display, perform Check 1.
❑ If there is no error message, go to Procedure 2.
❑ If Toshiba MS-DOS is properly loaded, go to Procedure 3.
Check 1 If one of the following error messages is displayed on the screen, press the F1 key
as the message instructs.
(a) *** Error in CMOS. Bad HDD type ***
Check system. Then press [F1] key ......
(b) *** Error in CMOS. Bad battery ***
Check system. Then press [F1] key ......
(c) *** Error in CMOS. Bad check sum ***
Check system. Then press [F1] key ......
(d) *** Error in CMOS. Bad memory size ***
Check system. Then press [F1] key ......
(e) *** Error in CMOS. Bad time function ***
Check system. Then press [F1] key ......
These errors occur when the system configuration preserved in the RTC memory
(CMOS-type memory) is not the same as the actual configuration or when the data
is lost.
If you press the F1 key as the message instructs, the system configuration in the
RTC memory configuration is set to the default setting. If Error Message (b)
appears often when the power is turned on, replace the RTC battery. If any other
error message is displayed, perform Check 2.
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