Toshiba Libretto 50CT/70CT Manual
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Libretto 50CT/70CT Maintenance Manual2-iiiTable of Contents2.1 Troubleshooting Overview...........................................................................................2-1 2.2 Troubleshooting Flowchart..........................................................................................2-2 2.3 Power Supply Troubleshooting....................................................................................2-5 Procedure 1 Power Status Check.....................................................................2-5 Procedure 2 Error Code Check........................................................................2-6 Procedure 3 Connection Check........................................................................2-9 Procedure 4 Replacement Check......................................................................2-9 2.4 System Board Troubleshooting..................................................................................2-10 Procedure 1 Message Check...........................................................................2-10 Procedure 2 Printer Port LED Check in Boot Mode.......................................2-12 Procedure 3 Printer Port LED Check in Hibernation Mode.............................2-14 Procedure 4 Diagnostic Test Program Execution and Replacement Checks....2-15 Procedure 5 Connection Check......................................................................2-16 2.5 Floppy Disk Drive (FDD) Troubleshooting................................................................2-17 Procedure 1 FDD Head Cleaning Check.........................................................2-17 Procedure 2 Diagnostic Test Program Execution Check.................................2-17 Procedure 3 Connector Check and Replacement Check..................................2-18 2.6 Hard Disk Drive (HDD) Troubleshooting..................................................................2-19 Procedure 1 Partition Check...........................................................................2-19 Procedure 2 Message Check...........................................................................2-20 Procedure 3 Format Check.............................................................................2-20 Procedure 4 Diagnostic Test Program Execution Check.................................2-21 2.7 Keyboard Troubleshooting........................................................................................2-23 Procedure 1 Diagnostic Test Program Execution Check.................................2-23 Procedure 2 Connector and Replacement Check.............................................2-23 2.8 Pointing Device Troubleshooting...............................................................................2-24 Procedure 1 Diagnostic Test Program Execution Check.................................2-24 Procedure 2 Connector and Replacement Check.............................................2-24 2.9 Display Troubleshooting............................................................................................2-25 Procedure 1 Diagnostic Test Program Execution Check.................................2-25 Procedure 2 Connector Check........................................................................2-25 Procedure 3 Replacement Check....................................................................2-25
2-ivLibretto 50CT/70CT Maintenance ManualFigures Figure 2-1 Troubleshooting flowchart (1/2).......................................................................2-3 Figure 2-2 Printer port LED............................................................................................2-12 Figure 2-3 Cable connection diagram................................................................................2-16 Tables Table 2-1 Battery icon.......................................................................................................2-5 Table 2-2 DC IN icon........................................................................................................2-5 Table 2-3 Printer port LED boot mode status (1/2)..........................................................2-13 Table 2-4 Printer port LED Hibernation mode error status...............................................2-15 Table 2-5 FDD error codes and statuses..........................................................................2-17 Table 2-6 Hard disk drive error codes and statuses..........................................................2-22
2 Troubleshooting Procedures2.1 Troubleshooting OverviewLibretto 50CT/70CT Maintenance Manual2-12 2.1 Troubleshooting OverviewChapter 2 describes how to determine if a Field Replaceable Unit (FRU) is causing the computer to malfunction. The FRUs covered are:· Power Supply· Floppy Disk Drive· Pointing Device · System Board· Hard Disk Drive· Display · FL Inverter Board· Keyboard The Tests and Diagnostics are described in Chapter 3 and Replacement Procedures are detailed in Chapter 4. The following tools are necessary for implementing the troubleshooting procedures:1. Diagnostics disk 2. Phillips screwdriver (2 mm) 3. Toshiba MS-DOS system disk(s) (You must install the following onto the disk: SYS.COM, FORMAT.COM,FDISK.COM and FDISK.EXE) 4. 2DD or 2HD formatted work disk for floppy disk drive testing 5. Cleaning kit for floppy disk drive troubleshooting 6. Printer port LED 7. Serial port wraparound connector 8. Multimeter 9. Printer port wraparound connector 10. PC card wraparound card 11. I/O Adapter 12. FDD
2.2 Troubleshooting Flowchart2 Troubleshooting Procedures2-2Libretto 50CT/70CT Maintenance Manual2.2 Troubleshooting FlowchartUse the flowchart in figure 2-1 as a guide to determine which troubleshooting procedures to execute. Before going through the flowchart steps, do the following:q Verify with the customer that Toshiba Windows 95 is installed on the hard disk. Non- Toshiba operating systems can cause the computer to malfunction. q Make sure all optional equipment is removed from the computer. q Make sure the floppy disk drive is empty.
2 Troubleshooting Procedures2.2 Troubleshooting FlowchartLibretto 50CT/70CT Maintenance Manual2-3Figure 2-1 Troubleshooting flowchart (1/2)
2.2 Troubleshooting Flowchart2 Troubleshooting Procedures2-4Libretto 50CT/70CT Maintenance ManualFigure 2-1 Troubleshooting flowchart (2/2) If the diagnostics program cannot detect an error, the problem may be intermittent. The Running Test program should be executed several times to isolate the problem. Check the Log Utilities function to confirm which diagnostic test detected an error(s), then perform the appropriate troubleshooting procedures as follows: 1. If an error is detected on the system test, memory test, display test, ASYNC test, printer test, expansion test, sound test, or real timer test do the System Board troubleshooting procedures in Section 2.4. 2. If an error is detected on the floppy disk test, do the FDD troubleshooting procedures in Section 2.5. 3. If an error is detected on the hard disk test, do the Hard Disk Drive troubleshooting procedures in Section 2.6. 4. If an error is detected on the keyboard test, do the Keyboard troubleshooting procedures in Section 2.7.5. If an error is detected on the display test, do the Display troubleshooting procedures in Section 2.9.
2 Troubleshooting Procedures2.3 Power Supply TroubleshootingLibretto 50CT/70CT Maintenance Manual2-52.3 Power Supply Troubleshooting The power supply controls many functions and components. To determine if the power supply is functioning properly, start with Procedure 1 and continue with the other Procedures as instructed. The procedures described in this section are: Procedure 1:Power Status Check Procedure 2:Error Code Check Procedure 3:Connection Check Procedure 4:Replacement Check Procedure 1Power Status Check The following icons indicate the power supply status: q Battery icon q DC IN icon The power supply controller displays the power supply status through the Battery and the DC IN icons as shown in the tables below. Table 2-1 Battery icon Battery iconPower supply statusLights orangeQuick charge *1Lights greenBattery has a full charge and the AC adapter is connectedBlinks orange (even intervals)The battery level becomes low while operating the computer on battery power*2Doesn’t lightAny condition other than those above. If the battery becomes too hot, charging will stop and the battery icon will go out even if the AC adapter is connected*1One of two battery levels becomes low. *2AutoResume Off will be executed soon. Table 2-2 DC IN icon DC IN iconPower supply statusLights greenDC power is being supplied from the AC adapterBlinks orangePower supply malfunction*3Blinks greenStand-by stateDoesn’t lightAny condition other than those above*3When the power supply controller detects a malfunction, the DC IN icon blinks and an error code is displayed.
2.3 Power Supply Troubleshooting2 Troubleshooting Procedures2-6Libretto 50CT/70CT Maintenance ManualTo check the power supply status, install a battery pack and connect an AC adapter. Check 1If the DC IN icon flashes orange, go to Procedure 2. Check 2If the DC IN icon does not light, go to Procedure 3. Check 3If the Battery icon does not light orange or green, go to Procedure 4. CAUTION: Use only an AC adapter that is manufactured specifically for the Libretto50CT/70CT. If you use a different AC adapter, the computer’s power supply maymalfunction or a fuse on the system board may be blown.Procedure 2Error Code Check If the microprocessor detects a malfunction, the DC IN icon blinks orange. The blink pattern indicates an error as shown below. q StartOff for 2 seconds q Error code (8 bit) “1”On for one second “0”On for half second Interval between data bitsOff for half second Error codes begin with the least significant digit. For example: Error code 12h (Error codes are given in hexadecimal)Check 1Convert the DC IN icon blink pattern into the hexadecimal error code and compare it to the tables below. q DC power supplied through AC adapter Error codeMeaning01hAC adapter voltage is over the limit (16.5 V)
2 Troubleshooting Procedures2.3 Power Supply TroubleshootingLibretto 50CT/70CT Maintenance Manual2-7q Battery pack Error codeMeaning10hBattery voltage is over the limit11hBattery charge current is over the limit12hBattery discharge current is over the maximum allowed limit when there is no load13hBattery voltage is under the limitq B5V,VCC output Error codeMeaning20hVCC voltage is over the limit21hVCC voltage is under the limit22hVCC does not start up when power supply is turned onq B3V output Error codeMeaning30hB3V voltage is over the limit31hB3V voltage is under the limit33hB3V does not start up when the power supply is turned onq Power supply microcontroller Error codeMeaning50hFirmware or program errorq CPU environmental conditionError codeMeaning 80hCPU temperature is outside the allowable range 88hCPU overheat (The CPU heat sensor has detected overheating and has automatically shut down)