Toshiba Libretto 50CT/70CT Manual

2.3  Power Supply Troubleshooting2  Troubleshooting Procedures2-8Libretto 50CT/70CT Maintenance ManualCheck 2If error code 01h displays:
q Be sure the AC adapter is firmly connected to the computer DC IN socket and
to the power source.  If these cables are connected correctly, go to the
following step:
q Replace the AC adapter with a new one.
If the error still exists, go to Procedure 4.
Check 3If error code 10h displays:
q Make sure the battery pack is correctly installed in the computer.
If it is, go...

2  Troubleshooting Procedures2.3  Power Supply TroubleshootingLibretto 50CT/70CT Maintenance Manual2-9Procedure 3Connection Check
The power supply related wiring diagrams are shown below:Any of the connectors may be disconnected.  Go to Check 1.
Check 1Make sure the AC adapter is firmly connected to the computer’s DC IN socket
and to a power source.  If these cables are connected correctly, go to Check 2.
Check 2Replace the AC adapter with a new one.  If the DC IN icon does not glow green,
go to...

2.4  System Board Troubleshooting2  Troubleshooting Procedures2-10Libretto 50CT/70CT Maintenance Manual2.4 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...

2  Troubleshooting Procedures2.4  System Board TroubleshootingLibretto 50CT/70CT Maintenance Manual2-11Check 2If the following error message displays on the screen, press any key.
WARNING:  CAN’T RESTORE HIBERNATED STATE.
PRESS ANY KEY TO CONTINUE.
This error message displays when the HDD has a bad sector in the area where the
Hibernation data was stored or when the system board is faulty.  Go to Procedure
4.
NOTE: If necessary, you can bypass Hibernation by pressing thebackspace key while you power on...

2.4  System Board Troubleshooting2  Troubleshooting Procedures2-12Libretto 50CT/70CT Maintenance Manual(17) PIC #2 ERROR
(18) KB ERROR
(19) HDC ERROR
(20) HDD #0 ERR2OR
(21) HDD #1 ERROR
(22) NO FDD ERROR
(23) FDC ERROR
(24) TIMER INTERRUPT ERROR
(25) RTC UPDATE ERROR
Procedure 2Printer Port LED Check in Boot Mode
The printer port LED displays the IRT status and test status by turning lights on and off as an
eight-digit binary value for boot mode.  Figure 2-2 shows the printer port LED.Figure 2-2...

2  Troubleshooting Procedures2.4  System Board TroubleshootingLibretto 50CT/70CT Maintenance Manual2-13NOTE:  If an error condition is detected by the IRT test, the printer port LED displays anerror code after the IRT test ends.  For example, when the printer port LED displays 1Fand halts, the IRT test has already completed the Display initialization.  In this instance,the IRT indicates an error has been detected during the system memory test.Table 2-3  Printer port LED boot mode status (1/2)
LED...

2.4  System Board Troubleshooting2  Troubleshooting Procedures2-14Libretto 50CT/70CT Maintenance ManualTable 2-3  Printer port LED boot mode status (2/2)
LED statusTest itemMessage42HDMAC initialization—4AHPIC testPIC #X ERRORMouse initialization—55HKBC initializationKBC ERROR60HHDD initializationHDC ERROR/HDD #0 ERROR65HFDD initializationFDC ERROR/NO FDD ERROR70HPrinter initialization—80HSIO initialization—90HTimer initializationRTC UPDATE ERROR
TIMER INTERRUPT ERRORA0HNDP...

2  Troubleshooting Procedures2.4  System Board TroubleshootingLibretto 50CT/70CT Maintenance Manual2-15To use the printer port LED follow these steps:1. Be sure the computer is in Hibernation mode.
2. Plug the printer port LED into the computer’s parallel port.
3. Turn the computer on.
4. Read the LED status from left to right as you face the back of the computer.
5. Convert the status from binary to hexadecimal notation.
6. If the final LED status is FFh (normal status), go to Procedure 4.
7. If the...

2.4  System Board Troubleshooting2  Troubleshooting Procedures2-16Libretto 50CT/70CT Maintenance ManualProcedure 5Connection Check
Check each cable connection shown in Figure 2-3, then retry the computer’s operation. If the
problem still exists, another I/O interface may be faulty.Figure 2-3 Cable connection diagram 

2  Troubleshooting Procedures2.5  Floppy Disk Drive (FDD) TroubleshootingLibretto 50CT/70CT Maintenance Manual2-172.5 Floppy Disk Drive (FDD) TroubleshootingThis section describes how to determine if the 3.5-inch FDD is functioning properly.
Perform the steps below starting with Procedure 1 and continuing with the other procedures
as required.Procedure 1:FDD Head Cleaning Check
Procedure 2:Diagnostic Test Program Execution Check
Procedure 3:Connector Check and Replacement Check
Procedure 1FDD Head...