Toshiba 650CT Maintenance Manual page 32

2.4 System Board/PCB Troubleshooting
This section describes how to determine if the system board or other PCBs are defective or
not functioning properly. Start with Procedure 1 and continue with the other procedures as
instructed. The procedures described in this section include:
Procedure 1:
Procedure 2:
Procedure 3:
Procedure 4:
Procedure 5:
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 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 or Toshiba Windows 95 is properly loaded, go to
Procedure 3.
Check 1 If any of the following error messages display, press the F1 key as the message
instructs. 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, the TSETUP screen appears to set the system configura-
tion. 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)
Check system.
(b)
Check system.
(c)
Check system.
(d)
Check system.
(e)
Check system.
(f)
Check system.
(g)
Check system.
2-14
Message Check
Printer Port LED Check on Boot Mode
Printer Port LED Check on Resume Mode
Diagnostic Test Program Execution Check
Replacement Check
*** Bad HDD type ***
Then press [F1] key ......
*** Bad RTC battery ***
Then press [F1] key ......
*** Bad configuration ***
Then press [F1] key ......
*** Bad memory size ***
Then press [F1] key ......
*** Bad time function ***
Then press [F1] key ......
*** Bad check sum (CMOS) ***
Then press [F1] key ......
*** Bad check sum (ROM) ***
Then press [F1] key ......
650CT