Toshiba 70CT User Guide - Page 43

System Board Troubleshooting, Troubleshooting Procedures - libretto cmos battery

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2.4 System Board Troubleshooting 2 Troubleshooting Procedures 2.4 System Board Troubleshooting 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 in Boot Mode Procedure 3: Printer Port LED Check in Hibernation Mode Procedure 4: Diagnostic Test Program Execution and Replacement Checks Procedure 5: Connection 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 each IC on the system board and initializes it. q If an error message is shown on the display, perform Check 1. q If there is no error message, go to Procedure 2. q If Toshiba MS-DOS or Toshiba Windows 95 is properly loaded, go to Procedure 3. Check 1 If one of the following error messages displays on the screen, press the F1 key as instructed. 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. Press the F1 key as the message instructs and the TSETUP screen displays to set the system configuration. If error message (b) displays often when the power is on, replace the RTC battery. If any other error message displays, do Check 2. (a) *** Bad HDD type *** Check system. Then press [F1] key ...... (b) *** Bad RTC battery *** Check system. Then press [F1] key ...... (c) *** Bad configuration *** Check system. Then press [F1] key ...... (d) *** Bad memory size *** Check system. Then press [F1] key ...... (e) *** Bad time function *** Check system. Then press [F1] key ...... (f) *** Bad check sum (CMOS) *** Check system. Then press [F1] key ...... (g) *** Bad check sum (ROM) *** Check system. Then press [F1] key ...... 2-10 Libretto 50CT/70CT Maintenance Manual

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2.4
System Board Troubleshooting
2
Troubleshooting Procedures
2-10
Libretto 50CT/70CT Maintenance Manual
2.4
System Board Troubleshooting
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 in Boot Mode
Procedure 3:
Printer Port LED Check in Hibernation Mode
Procedure 4:
Diagnostic Test Program Execution and Replacement Checks
Procedure 5:
Connection 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 each IC on the system board and initializes it.
q
If an error message is shown on the display, perform Check 1.
q
If there is no error message, go to Procedure 2.
q
If Toshiba MS-DOS or Toshiba Windows 95 is properly loaded, go to Procedure 3.
Check 1
If one of the following error messages displays on the screen, press the
F1
key as
instructed.
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.
Press the
F1
key as the message instructs and the TSETUP screen displays to set
the system configuration.
If error message (b) displays often when the power is
on, replace the RTC battery.
If any other error message displays, do Check 2.
(a)
*** Bad HDD type ***
Check system.
Then press [F1] key
......
(b)
*** Bad RTC battery ***
Check system.
Then press [F1] key
......
(c)
*** Bad configuration ***
Check system.
Then press [F1] key
......
(d)
*** Bad memory size ***
Check system.
Then press [F1] key
......
(e)
*** Bad time function ***
Check system.
Then press [F1] key
......
(f)
*** Bad check sum (CMOS) ***
Check system.
Then press [F1] key
......
(g)
*** Bad check sum (ROM) ***
Check system.
Then press [F1] key
......