Toshiba portege 610ct 620ct Instruction De Maintenance

2-8

This section describes how to determine if the system board is defective or not functioning
properly.  Start with Procedure 1 and continue with the other procedures as instructed.  The
procedures described in this section are:

Procedure 1:

Message Check

Procedure 2:

Printer Port LED Check on Boot Mode

Procedure 3:

Printer Port LED Check on Resume Mode

Procedure 4:

Diagnostic Test Program Execution Check

Procedure 5:

Replacement Check

When the power is turned on, the system performs the Initial Reliability Test (IRT) installed in
the BIOS ROM.  The IRT tests each IC on the system board and initializes it.

❑ 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.  These errors occur when data is lost or when the system
configuration preserved in the RTC memory (CMOS type memory) is not the
same as the actual configuration.

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.

(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 ......